diff --git a/.config/dotnet-tools.json b/.config/dotnet-tools.json
new file mode 100644
index 0000000..c1e4bf5
--- /dev/null
+++ b/.config/dotnet-tools.json
@@ -0,0 +1,12 @@
+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "fantomas": {
+      "version": "6.3.8",
+      "commands": [
+        "fantomas"
+      ]
+    }
+  }
+}
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..e744fe1
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,40 @@
+root = true
+
+[*]
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+
+# ReSharper properties
+resharper_xml_indent_size = 2
+resharper_xml_max_line_length = 100
+resharper_xml_tab_width = 2
+
+[*.{csproj,fsproj,sqlproj,targets,props,ts,tsx,css,json}]
+indent_style = space
+indent_size = 2
+
+[*.{fs,fsi}]
+fsharp_bar_before_discriminated_union_declaration = true
+fsharp_space_before_uppercase_invocation = true
+fsharp_space_before_class_constructor = true
+fsharp_space_before_member = true
+fsharp_space_before_colon = true
+fsharp_space_before_semicolon = true
+fsharp_multiline_bracket_style = aligned
+fsharp_newline_between_type_definition_and_members = true
+fsharp_align_function_signature_to_indentation = true
+fsharp_alternative_long_member_definitions = true
+fsharp_multi_line_lambda_closing_newline = true
+fsharp_experimental_keep_indent_in_branch = true
+fsharp_max_value_binding_width = 80
+fsharp_max_record_width = 0
+max_line_length = 120
+end_of_line = lf
+
+[*.{appxmanifest,build,dtd,nuspec,xaml,xamlx,xoml,xsd}]
+indent_style = space
+indent_size = 2
+tab_width = 2
diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..3550a30
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/.fantomasignore b/.fantomasignore
new file mode 100644
index 0000000..9b42106
--- /dev/null
+++ b/.fantomasignore
@@ -0,0 +1 @@
+.direnv/
diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 0000000..203a3b5
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1,3 @@
+# See: https://help.github.com/articles/about-codeowners/
+
+* @G-Research/rqf @G-Research/gr-oss
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..1d54482
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,8 @@
+# yaml-language-server: $schema=https://json.schemastore.org/dependabot-2.0.json
+version: 2
+updates:
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
diff --git a/.github/workflows/dotnet.yaml b/.github/workflows/dotnet.yaml
new file mode 100644
index 0000000..6abf99e
--- /dev/null
+++ b/.github/workflows/dotnet.yaml
@@ -0,0 +1,217 @@
+# yaml-language-server: $schema=https://raw.githubusercontent.com/SchemaStore/schemastore/master/src/schemas/json/github-workflow.json
+name: .NET
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  DOTNET_NOLOGO: true
+  DOTNET_CLI_TELEMETRY_OPTOUT: true
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
+  NUGET_XMLDOC_MODE: ''
+  DOTNET_MULTILEVEL_LOOKUP: 0
+
+jobs:
+  build-windows:
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0 # so that NerdBank.GitVersioning has access to history
+    - uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: '8.0.x'
+    - name: Restore dependencies
+      run: dotnet restore
+    - name: Test
+      run: dotnet test
+    - name: Run example
+      run: ".\\Example\\bin\\Release\\net8.0\\win-x64\\Example.exe"
+
+  build:
+    strategy:
+      matrix:
+        config:
+          - Release
+          - Debug
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0 # so that NerdBank.GitVersioning has access to history
+    - name: Install Nix
+      uses: cachix/install-nix-action@V27
+      with:
+        extra_nix_config: |
+          access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+    - name: Restore dependencies
+      run: nix develop --command dotnet restore
+    - name: Build
+      run: nix develop --command dotnet build --no-restore --configuration ${{matrix.config}}
+    - name: Test
+      run: nix develop --command dotnet test --no-build --verbosity normal --configuration ${{matrix.config}}
+
+  build-nix:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: cachix/install-nix-action@V27
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+      - name: Build
+        run: nix build
+
+  check-dotnet-format:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: cachix/install-nix-action@V27
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+      - name: Run Fantomas
+        run: nix run .#fantomas -- --check .
+
+  check-nix-format:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Install Nix
+        uses: cachix/install-nix-action@V27
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+      - name: Run Alejandra
+        run: nix develop --command alejandra --check .
+
+  linkcheck:
+    name: Check links
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - name: Install Nix
+        uses: cachix/install-nix-action@V27
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+      - name: Run link checker
+        run: nix develop --command markdown-link-check README.md
+
+  flake-check:
+    name: Check flake
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - name: Install Nix
+        uses: cachix/install-nix-action@V27
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+      - name: Flake check
+        run: nix flake check
+
+  nuget-pack:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0 # so that NerdBank.GitVersioning has access to history
+    - name: Install Nix
+      uses: cachix/install-nix-action@V27
+      with:
+        extra_nix_config: |
+          access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+    - name: Restore dependencies
+      run: nix develop --command dotnet restore
+    - name: Build
+      run: nix develop --command dotnet build --no-restore --configuration Release
+    - name: Pack
+      run: nix develop --command dotnet pack --configuration Release
+    - name: Upload NuGet artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: nuget-package
+        path: WoofWare.DotnetRuntimeLocator/bin/Release/WoofWare.DotnetRuntimeLocator.*.nupkg
+
+  expected-pack:
+    needs: [nuget-pack]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download NuGet artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: nuget-package
+          path: packed
+      - name: Check NuGet contents
+        # Verify that there is exactly one nupkg in the artifact that would be NuGet published
+        run: if [[ $(find packed -maxdepth 1 -name 'WoofWare.DotnetRuntimeLocator.*.nupkg' -printf c | wc -c) -ne "1" ]]; then exit 1; fi
+
+  github-release-dry-run:
+    needs: [nuget-pack]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Download NuGet artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: nuget-package
+      - name: Tag and release
+        env:
+          DRY_RUN: 1
+          GITHUB_TOKEN: mock-token
+        run: sh .github/workflows/tag.sh
+
+  all-required-checks-complete:
+    needs: [check-dotnet-format, check-nix-format, build, build-nix, linkcheck, flake-check, nuget-pack, expected-pack, github-release-dry-run]
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "All required checks complete."
+
+  nuget-publish:
+    runs-on: ubuntu-latest
+    if: ${{ !github.event.repository.fork && github.ref == 'refs/heads/main' }}
+    needs: [all-required-checks-complete]
+    environment: main-deploy
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Nix
+        uses: cachix/install-nix-action@V27
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+      - name: Download NuGet artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: nuget-package
+          path: packed
+      - name: Publish to NuGet
+        run: nix develop --command dotnet nuget push "packed/WoofWare.DotnetRuntimeLocator.*.nupkg" --api-key ${{ secrets.NUGET_API_KEY }} --source https://api.nuget.org/v3/index.json --skip-duplicate
+
+  github-release:
+    runs-on: ubuntu-latest
+    if: ${{ !github.event.repository.fork && github.ref == 'refs/heads/main' }}
+    needs: [all-required-checks-complete]
+    environment: main-deploy
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+      - name: Download NuGet artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: nuget-package
+      - name: Tag and release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: sh .github/workflows/tag.sh
diff --git a/.github/workflows/tag.sh b/.github/workflows/tag.sh
new file mode 100644
index 0000000..e2795f1
--- /dev/null
+++ b/.github/workflows/tag.sh
@@ -0,0 +1,120 @@
+#!/bin/bash
+
+echo "Dry-run? $DRY_RUN!"
+
+find . -maxdepth 1 -type f ! -name "$(printf "*\n*")" -name '*.nupkg' | while IFS= read -r file
+do
+    tag=$(basename "$file" .nupkg)
+    git tag "$tag"
+    ${DRY_RUN:+echo} git push origin "$tag"
+done
+
+export TAG
+TAG=$(find . -maxdepth 1 -type f -name 'WoofWare.DotnetRuntimeLocator.*.nupkg' -exec sh -c 'basename "$1" .nupkg' shell {} \; | grep -v Attributes)
+
+case "$TAG" in
+  *"
+"*)
+    echo "Error: TAG contains a newline; multiple plugins found."
+    exit 1
+    ;;
+esac
+
+# target_commitish empty indicates the repo default branch
+curl_body='{"tag_name":"'"$TAG"'","target_commitish":"","name":"'"$TAG"'","draft":false,"prerelease":false,"generate_release_notes":false}'
+
+echo "cURL body: $curl_body"
+
+failed_output=$(cat <<'EOF'
+{
+  "message": "Validation Failed",
+  "errors": [
+    {
+      "resource": "Release",
+      "code": "already_exists",
+      "field": "tag_name"
+    }
+  ],
+  "documentation_url": "https://docs.github.com/rest/releases/releases#create-a-release"
+}
+EOF
+)
+
+success_output=$(cat <<'EOF'
+{
+  "url": "https://api.github.com/repos/Smaug123/WoofWare.DotnetRuntimeLocator/releases/158152116",
+  "assets_url": "https://api.github.com/repos/Smaug123/WoofWare.DotnetRuntimeLocator/releases/158152116/assets",
+  "upload_url": "https://uploads.github.com/repos/Smaug123/WoofWare.DotnetRuntimeLocator/releases/158152116/assets{?name,label}",
+  "html_url": "https://github.com/Smaug123/WoofWare.DotnetRuntimeLocator/releases/tag/WoofWare.DotnetRuntimeLocator.2.1.30",
+  "id": 158152116,
+  "author": {
+    "login": "github-actions[bot]",
+    "id": 41898282,
+    "node_id": "MDM6Qm90NDE4OTgyODI=",
+    "avatar_url": "https://avatars.githubusercontent.com/in/15368?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/github-actions%5Bbot%5D",
+    "html_url": "https://github.com/apps/github-actions",
+    "followers_url": "https://api.github.com/users/github-actions%5Bbot%5D/followers",
+    "following_url": "https://api.github.com/users/github-actions%5Bbot%5D/following{/other_user}",
+    "gists_url": "https://api.github.com/users/github-actions%5Bbot%5D/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/github-actions%5Bbot%5D/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/github-actions%5Bbot%5D/subscriptions",
+    "organizations_url": "https://api.github.com/users/github-actions%5Bbot%5D/orgs",
+    "repos_url": "https://api.github.com/users/github-actions%5Bbot%5D/repos",
+    "events_url": "https://api.github.com/users/github-actions%5Bbot%5D/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/github-actions%5Bbot%5D/received_events",
+    "type": "Bot",
+    "site_admin": false
+  },
+  "node_id": "RE_kwDOJfksgc4JbTW0",
+  "tag_name": "WoofWare.DotnetRuntimeLocator.2.1.30",
+  "target_commitish": "main",
+  "name": "WoofWare.DotnetRuntimeLocator.2.1.30",
+  "draft": false,
+  "prerelease": false,
+  "created_at": "2024-05-30T11:00:55Z",
+  "published_at": "2024-05-30T11:03:02Z",
+  "assets": [
+
+  ],
+  "tarball_url": "https://api.github.com/repos/Smaug123/WoofWare.DotnetRuntimeLocator/tarball/WoofWare.DotnetRuntimeLocator.2.1.30",
+  "zipball_url": "https://api.github.com/repos/Smaug123/WoofWare.DotnetRuntimeLocator/zipball/WoofWare.DotnetRuntimeLocator.2.1.30",
+  "body": null
+}
+EOF
+)
+
+HANDLE_OUTPUT=''
+handle_error() {
+    ERROR_OUTPUT="$1"
+    exit_message=$(echo "$ERROR_OUTPUT" | jq -r --exit-status 'if .errors | length == 1 then .errors[0].code else null end')
+    if [ "$exit_message" = "already_exists" ] ; then
+        HANDLE_OUTPUT="Did not create GitHub release because it already exists at this version."
+    else
+        echo "Unexpected error output from curl: $(cat curl_output.json)"
+        echo "JQ output: $(exit_message)"
+        exit 2
+    fi
+}
+
+run_tests() {
+    handle_error "$failed_output"
+    if [ "$HANDLE_OUTPUT" != "Did not create GitHub release because it already exists at this version." ]; then
+        echo "Bad output from handler: $HANDLE_OUTPUT"
+        exit 3
+    fi
+    HANDLE_OUTPUT=''
+    echo "Tests passed."
+}
+
+run_tests
+
+if [ "$DRY_RUN" != 1 ] ; then
+    if curl --fail-with-body -L -X POST -H "Accept: application/vnd.github+json" -H "Authorization: Bearer $GITHUB_TOKEN" -H "X-GitHub-Api-Version: 2022-11-28" https://api.github.com/repos/Smaug123/WoofWare.DotnetRuntimeLocator/releases -d "$curl_body" > curl_output.json; then
+        echo "Curl succeeded."
+    else
+        handle_error "$(cat curl_output.json)"
+        echo "$HANDLE_OUTPUT"
+    fi
+fi
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..38fb0e1
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,12 @@
+bin/
+obj/
+/packages/
+riderModule.iml
+/_ReSharper.Caches/
+.idea/
+*.sln.DotSettings.user
+.DS_Store
+result
+.analyzerpackages/
+analysis.sarif
+.direnv/
diff --git a/Directory.Build.props b/Directory.Build.props
new file mode 100644
index 0000000..cbf2f3e
--- /dev/null
+++ b/Directory.Build.props
@@ -0,0 +1,16 @@
+<Project>
+  <PropertyGroup>
+    <DebugType Condition=" '$(DebugType)' == '' ">embedded</DebugType>
+    <Deterministic>true</Deterministic>
+    <NetCoreTargetingPackRoot>[UNDEFINED]</NetCoreTargetingPackRoot>
+    <DisableImplicitLibraryPacksFolder>true</DisableImplicitLibraryPacksFolder>
+    <DisableImplicitNuGetFallbackFolder>true</DisableImplicitNuGetFallbackFolder>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <DebugType>embedded</DebugType>
+    <WarnOn>FS3388,FS3559</WarnOn>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Nerdbank.GitVersioning" Version="3.6.133" PrivateAssets="all"/>
+    <SourceLinkGitHubHost Include="github.com" ContentUrl="https://raw.githubusercontent.com"/>
+  </ItemGroup>
+</Project>
diff --git a/Example/Example.fsproj b/Example/Example.fsproj
new file mode 100644
index 0000000..18f0d71
--- /dev/null
+++ b/Example/Example.fsproj
@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+      <SelfContained>true</SelfContained>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <Compile Include="Program.fs"/>
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\WoofWare.DotnetRuntimeLocator\WoofWare.DotnetRuntimeLocator.csproj" />
+    </ItemGroup>
+
+</Project>
diff --git a/Example/Program.fs b/Example/Program.fs
new file mode 100644
index 0000000..26250a3
--- /dev/null
+++ b/Example/Program.fs
@@ -0,0 +1,21 @@
+namespace Example
+
+open System
+open WoofWare.DotnetRuntimeLocator
+
+module Program =
+    [<EntryPoint>]
+    let main argv =
+        let info = DotnetEnvironmentInfo.Get ()
+        Console.WriteLine info
+        Console.WriteLine ("SDKs:")
+
+        for sdk in info.Sdks do
+            Console.WriteLine $"SDK: %O{sdk}"
+
+        Console.WriteLine ("Frameworks:")
+
+        for f in info.Frameworks do
+            Console.WriteLine $"Framework: %O{f}"
+
+        0
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..debcfa2
--- /dev/null
+++ b/README.md
@@ -0,0 +1,14 @@
+# WoofWare.DotnetRuntimeLocator
+
+Helpers to locate the .NET runtime and SDKs programmatically.
+(If you're parsing `dotnet --list-runtimes`, you're doing it wrong!)
+
+## Usage
+
+See [the example](Example/Program.fs).
+
+```fsharp
+let info = DotnetEnvironmentInfo.Get ()
+// or, if you already know a path to the `dotnet` executable...
+let info = DotnetEnvironmentInfo.Get "/path/to/dotnet"
+```
diff --git a/WoofWare.DotnetRuntimeLocator.sln b/WoofWare.DotnetRuntimeLocator.sln
new file mode 100644
index 0000000..b293925
--- /dev/null
+++ b/WoofWare.DotnetRuntimeLocator.sln
@@ -0,0 +1,34 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WoofWare.DotnetRuntimeLocator", "WoofWare.DotnetRuntimeLocator\WoofWare.DotnetRuntimeLocator.csproj", "{6AEC4B30-8AFE-4071-A5FB-DBA6EB2D8194}"
+EndProject
+Project("{F2A71F9B-5D33-465A-A702-920D77279786}") = "Test", "WoofWare.DotnetRuntimeLocator\Test\Test.fsproj", "{7123924E-E6C5-4612-9E2E-2C4B8D14C7B2}"
+EndProject
+Project("{F2A71F9B-5D33-465A-A702-920D77279786}") = "Example", "Example\Example.fsproj", "{C295BC67-F932-4225-9183-7173B26E1F9E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{6AEC4B30-8AFE-4071-A5FB-DBA6EB2D8194}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6AEC4B30-8AFE-4071-A5FB-DBA6EB2D8194}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6AEC4B30-8AFE-4071-A5FB-DBA6EB2D8194}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6AEC4B30-8AFE-4071-A5FB-DBA6EB2D8194}.Release|Any CPU.Build.0 = Release|Any CPU
+		{7123924E-E6C5-4612-9E2E-2C4B8D14C7B2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7123924E-E6C5-4612-9E2E-2C4B8D14C7B2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7123924E-E6C5-4612-9E2E-2C4B8D14C7B2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7123924E-E6C5-4612-9E2E-2C4B8D14C7B2}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C295BC67-F932-4225-9183-7173B26E1F9E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C295BC67-F932-4225-9183-7173B26E1F9E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C295BC67-F932-4225-9183-7173B26E1F9E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C295BC67-F932-4225-9183-7173B26E1F9E}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal
diff --git a/WoofWare.DotnetRuntimeLocator/Boilerplate.cs b/WoofWare.DotnetRuntimeLocator/Boilerplate.cs
new file mode 100644
index 0000000..698fadd
--- /dev/null
+++ b/WoofWare.DotnetRuntimeLocator/Boilerplate.cs
@@ -0,0 +1,28 @@
+namespace System.Runtime.CompilerServices
+{
+    internal class RequiredMemberAttribute : Attribute
+    {
+    }
+
+    internal class CompilerFeatureRequiredAttribute : Attribute
+    {
+        public CompilerFeatureRequiredAttribute(string name)
+        {
+        }
+    }
+}
+
+namespace System.Diagnostics.CodeAnalysis
+{
+    [AttributeUsage(AttributeTargets.Constructor)]
+    internal sealed class SetsRequiredMembersAttribute : Attribute
+    {
+    }
+}
+
+namespace System.Runtime.CompilerServices
+{
+    internal static class IsExternalInit
+    {
+    }
+}
diff --git a/WoofWare.DotnetRuntimeLocator/DotnetEnvironmentFrameworkInfo.cs b/WoofWare.DotnetRuntimeLocator/DotnetEnvironmentFrameworkInfo.cs
new file mode 100644
index 0000000..5909afa
--- /dev/null
+++ b/WoofWare.DotnetRuntimeLocator/DotnetEnvironmentFrameworkInfo.cs
@@ -0,0 +1,29 @@
+using System.IO;
+using System.Runtime.InteropServices;
+
+namespace WoofWare.DotnetRuntimeLocator;
+
+/// <summary>
+///     Information about a single instance of the .NET runtime.
+/// </summary>
+/// <param name="Name">The name of this runtime, e.g. "Microsoft.NETCore.App"</param>
+/// <param name="Path">
+///     The path to this runtime, e.g. "/usr/bin/dotnet/shared/Microsoft.AspNetCore.App" (I'm guessing at
+///     the prefix here, I use Nix so my paths are all different)
+/// </param>
+/// <param name="Version">The version of this runtime, e.g. "8.0.5"</param>
+public record DotnetEnvironmentFrameworkInfo(string Name, string Path, string Version)
+{
+    internal static DotnetEnvironmentFrameworkInfo FromNative(
+        InteropStructs.DotnetEnvironmentFrameworkInfoNative native)
+    {
+        if (native.size < 0 || native.size > int.MaxValue)
+            throw new InvalidDataException("size field did not fit in an int");
+
+        var size = (int)native.size;
+        if (size != Marshal.SizeOf(native))
+            throw new InvalidDataException($"size field {size} did not match expected size {Marshal.SizeOf(native)}");
+
+        return new DotnetEnvironmentFrameworkInfo(native.name, native.path, native.version);
+    }
+}
diff --git a/WoofWare.DotnetRuntimeLocator/DotnetEnvironmentInfo.cs b/WoofWare.DotnetRuntimeLocator/DotnetEnvironmentInfo.cs
new file mode 100644
index 0000000..d917d1f
--- /dev/null
+++ b/WoofWare.DotnetRuntimeLocator/DotnetEnvironmentInfo.cs
@@ -0,0 +1,231 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace WoofWare.DotnetRuntimeLocator;
+
+/// <summary>
+///     Information known to `dotnet` about what frameworks and runtimes are available.
+/// </summary>
+/// <param name="HostFxrVersion">Version of the runtime, e.g. "8.0.5"</param>
+/// <param name="HostFxrCommitHash">
+///     A commit hash of the .NET runtime (as of this writing, this is probably a hash from
+///     https://github.com/dotnet/runtime).
+/// </param>
+/// <param name="Sdks">Collection of .NET SDKs we were able to find.</param>
+/// <param name="Frameworks">Collection of .NET runtimes we were able to find.</param>
+public record DotnetEnvironmentInfo(
+    string HostFxrVersion,
+    string HostFxrCommitHash,
+    IReadOnlyList<DotnetEnvironmentSdkInfo> Sdks,
+    IReadOnlyList<DotnetEnvironmentFrameworkInfo> Frameworks)
+{
+    private static readonly Lazy<FileInfo> HostFxr = new(() =>
+    {
+        // First, we might be self-contained: try and find it next to us.
+        var selfContainedAttempt = Directory.GetParent(Assembly.GetExecutingAssembly().Location);
+        if (selfContainedAttempt != null)
+        {
+            var attempt = selfContainedAttempt.EnumerateFiles("*hostfxr*").FirstOrDefault();
+            if (attempt != null) return attempt;
+        }
+
+        var runtimeDir = new DirectoryInfo(RuntimeEnvironment.GetRuntimeDirectory());
+        var parent1 = runtimeDir.Parent ??
+                      throw new Exception("Unable to locate the host/fxr directory in the .NET runtime");
+        var parent2 = parent1.Parent ??
+                      throw new Exception("Unable to locate the host/fxr directory in the .NET runtime");
+        var parent3 = parent2.Parent ??
+                      throw new Exception("Unable to locate the host/fxr directory in the .NET runtime");
+        var fxrDir = new DirectoryInfo(Path.Combine(parent3.FullName, "host", "fxr"));
+        return fxrDir.EnumerateDirectories().First().EnumerateFiles("*hostfxr*").First();
+    });
+
+    private static FileInfo ResolveAllSymlinks(FileInfo f)
+    {
+        while (!ReferenceEquals(null, f.LinkTarget))
+        {
+            var parent = f.Directory ?? new DirectoryInfo("/");
+            f = new FileInfo(Path.Combine(parent.FullName, f.LinkTarget));
+        }
+
+        return f;
+    }
+
+    /// <summary>
+    ///     Takes a DotnetEnvironmentInfoNative and a return location, which must fit a DotnetEnvironmentInfo.
+    ///     Renders the DotnetEnvironmentInfoNative and stores it in the return location.
+    /// </summary>
+    private static void StoreResult(IntPtr envInfo, IntPtr retLoc)
+    {
+        var toRet = FromNativeConstructor.FromNative(
+            Marshal.PtrToStructure<InteropStructs.DotnetEnvironmentInfoNative>(envInfo));
+        var handle = GCHandle.FromIntPtr(retLoc);
+        handle.Target = toRet;
+    }
+
+    private static unsafe DotnetEnvironmentInfo CallDelegate(string? dotnetExePath, RuntimeDelegate f)
+    {
+        byte[]? dotnet = null;
+        if (dotnetExePath != null)
+        {
+            dotnet = Encoding.ASCII.GetBytes(dotnetExePath);
+        }
+        fixed (byte* dotnetPath = dotnet)
+        {
+            DotnetEnvironmentInfo? toRet = null;
+            var handle = GCHandle.Alloc(toRet);
+            try
+            {
+                var del = (StoreResultDelegate)StoreResult;
+                var callback = Marshal.GetFunctionPointerForDelegate(del);
+
+                var rc = f.Invoke((IntPtr)dotnetPath, IntPtr.Zero, callback, GCHandle.ToIntPtr(handle));
+                if (rc != 0) throw new Exception($"Could not obtain .NET environment information (exit code: {rc})");
+
+                if (ReferenceEquals(null, handle.Target))
+                    throw new NullReferenceException(
+                        "Unexpectedly failed to populate DotnetEnvironmentInfo, despite the native call succeeding.");
+                return (DotnetEnvironmentInfo)handle.Target;
+            }
+            finally
+            {
+                handle.Free();
+            }
+        }
+    }
+
+    /// <summary>
+    ///     Get the environment information that is available to the specified `dotnet` executable.
+    /// </summary>
+    /// <param name="dotnetExe">A `dotnet` (or `dotnet.exe`) executable, e.g. one from /usr/bin/dotnet. Set this to null if you want us to just do our best.</param>
+    /// <returns>Information about the environment available to the given executable.</returns>
+    /// <exception cref="Exception">Throws on any failure; handles nothing gracefully.</exception>
+    public static DotnetEnvironmentInfo GetSpecific(FileInfo? dotnetExe)
+    {
+        var hostFxr = HostFxr.Value;
+        var lib = NativeLibrary.Load(hostFxr.FullName);
+        try
+        {
+            var ptr = NativeLibrary.GetExport(lib, "hostfxr_get_dotnet_environment_info");
+            if (ptr == IntPtr.Zero) throw new Exception("Unable to load function from native library");
+
+            var f = Marshal.GetDelegateForFunctionPointer<RuntimeDelegate>(ptr);
+            string? dotnetParent = null;
+            if (dotnetExe != null)
+            {
+                var dotnetNoSymlinks = ResolveAllSymlinks(dotnetExe);
+                var parent = dotnetNoSymlinks.Directory;
+                if (parent != null)
+                {
+                    dotnetParent = parent.FullName;
+                }
+            }
+            return CallDelegate(dotnetParent, f);
+        }
+        finally
+        {
+            NativeLibrary.Free(lib);
+        }
+    }
+
+    private static FileInfo? FindDotnetAbove(DirectoryInfo path)
+    {
+        while (true)
+        {
+            var candidate = Path.Combine(path.FullName, "dotnet");
+            if (File.Exists(candidate)) return new FileInfo(candidate);
+
+            if (ReferenceEquals(path.Parent, null)) return null;
+
+            path = path.Parent;
+        }
+    }
+
+    /// <summary>
+    ///     Get the environment information that is available to some arbitrary `dotnet` executable we were able to find.
+    /// </summary>
+    /// <returns>Information about the environment available to `dotnet`.</returns>
+    /// <exception cref="Exception">Throws on any failure; handles nothing gracefully.</exception>
+    public static DotnetEnvironmentInfo Get()
+    {
+        var dotnetExe = FindDotnetAbove(new DirectoryInfo(RuntimeEnvironment.GetRuntimeDirectory()));
+
+        if (ReferenceEquals(dotnetExe, null))
+        {
+            // This can happen! Maybe we're self-contained.
+            return GetSpecific(null);
+        }
+
+        return GetSpecific(dotnetExe);
+    }
+
+    /// <summary>
+    ///     The signature of hostfxr_get_dotnet_environment_info.
+    ///     Its implementation is
+    ///     https://github.com/dotnet/runtime/blob/2dba5a3587de19160fb09129dcd3d7a4089b67b5/src/native/corehost/fxr/hostfxr.cpp#L357
+    ///     Takes:
+    ///     * The ASCII-encoded path to the directory which contains the `dotnet` executable
+    ///     * A structure which is reserved for future use and which must currently be null
+    ///     * A pointer to a callback which takes two arguments: a DotnetEnvironmentInfoNative
+    ///     (https://github.com/dotnet/runtime/blob/2dba5a3587de19160fb09129dcd3d7a4089b67b5/src/native/corehost/hostfxr.h#L311)
+    ///     and a context object you supplied.
+    ///     This callback is represented by the type `StoreResultDelegate`.
+    ///     * A pointer to the context object you want to consume in the callback.
+    ///     Returns zero on success.
+    /// </summary>
+    internal delegate int RuntimeDelegate(IntPtr pathToDotnetExeDirectory, IntPtr mustBeNull, IntPtr outputCallback,
+        IntPtr outputArg);
+
+    /// <summary>
+    ///     The callback which you pass to RuntimeDelegate.
+    ///     Takes:
+    ///     * a DotnetEnvironmentInfoNative
+    ///     (https://github.com/dotnet/runtime/blob/2dba5a3587de19160fb09129dcd3d7a4089b67b5/src/native/corehost/hostfxr.h#L311)
+    ///     * a context object, which is up to you to define and to pass into the RuntimeDelegate.
+    /// </summary>
+    internal delegate void StoreResultDelegate(IntPtr envInfo, IntPtr retLoc);
+}
+
+internal class FromNativeConstructor
+{
+    internal static DotnetEnvironmentInfo FromNative(InteropStructs.DotnetEnvironmentInfoNative native)
+    {
+        if (native.size < 0 || native.size > int.MaxValue)
+            throw new InvalidDataException("size field did not fit in an int");
+        var size = (int)native.size;
+        if (native.framework_count < 0 || native.framework_count > int.MaxValue)
+            throw new InvalidDataException("framework_count field did not fit in an int");
+        var frameworkCount = (int)native.framework_count;
+        if (native.sdk_count < 0 || native.sdk_count > int.MaxValue)
+            throw new InvalidDataException("sdk_count field did not fit in an int");
+        var sdkCount = (int)native.sdk_count;
+
+        if (size != Marshal.SizeOf(native))
+            throw new InvalidDataException($"size field {size} did not match expected size {Marshal.SizeOf(native)}");
+
+        var frameworks = new List<DotnetEnvironmentFrameworkInfo>((int)native.framework_count);
+        for (var i = 0; i < frameworkCount; i++)
+        {
+            var frameworkInfo = new IntPtr(native.frameworks.ToInt64() +
+                                           i * Marshal.SizeOf<InteropStructs.DotnetEnvironmentFrameworkInfoNative>());
+            frameworks.Add(DotnetEnvironmentFrameworkInfo.FromNative(
+                Marshal.PtrToStructure<InteropStructs.DotnetEnvironmentFrameworkInfoNative>(frameworkInfo)));
+        }
+
+        var sdks = new List<DotnetEnvironmentSdkInfo>((int)native.sdk_count);
+        for (var i = 0; i < sdkCount; i++)
+        {
+            var sdkInfo = new IntPtr(native.sdks.ToInt64() +
+                                     i * Marshal.SizeOf<InteropStructs.DotnetEnvironmentSdkInfoNative>());
+            sdks.Add(DotnetEnvironmentSdkInfo.FromNative(
+                Marshal.PtrToStructure<InteropStructs.DotnetEnvironmentSdkInfoNative>(sdkInfo)));
+        }
+
+        return new DotnetEnvironmentInfo(native.hostfxr_version, native.hostfxr_commit_hash, sdks, frameworks);
+    }
+}
diff --git a/WoofWare.DotnetRuntimeLocator/DotnetEnvironmentSdkInfo.cs b/WoofWare.DotnetRuntimeLocator/DotnetEnvironmentSdkInfo.cs
new file mode 100644
index 0000000..b76c42b
--- /dev/null
+++ b/WoofWare.DotnetRuntimeLocator/DotnetEnvironmentSdkInfo.cs
@@ -0,0 +1,27 @@
+using System.IO;
+using System.Runtime.InteropServices;
+
+namespace WoofWare.DotnetRuntimeLocator;
+
+/// <summary>
+///     Information about a single instance of the .NET SDK.
+/// </summary>
+/// <param name="Path">
+///     The path to this SDK, e.g. "/usr/bin/dotnet/sdk/8.0.300" (I'm guessing at the prefix there, I use
+///     Nix so my paths are different)
+/// </param>
+/// <param name="Version">e.g. "8.0.300"</param>
+public record DotnetEnvironmentSdkInfo(string Path, string Version)
+{
+    internal static DotnetEnvironmentSdkInfo FromNative(InteropStructs.DotnetEnvironmentSdkInfoNative native)
+    {
+        if (native.size < 0 || native.size > int.MaxValue)
+            throw new InvalidDataException("size field did not fit in an int");
+
+        var size = (int)native.size;
+        if (size != Marshal.SizeOf(native))
+            throw new InvalidDataException($"size field {size} did not match expected size {Marshal.SizeOf(native)}");
+
+        return new DotnetEnvironmentSdkInfo(native.path, native.version);
+    }
+}
diff --git a/WoofWare.DotnetRuntimeLocator/InteropStructs.cs b/WoofWare.DotnetRuntimeLocator/InteropStructs.cs
new file mode 100644
index 0000000..c3a3f85
--- /dev/null
+++ b/WoofWare.DotnetRuntimeLocator/InteropStructs.cs
@@ -0,0 +1,46 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace WoofWare.DotnetRuntimeLocator;
+
+internal static class InteropStructs
+{
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
+    internal struct DotnetEnvironmentSdkInfoNative
+    {
+        public nuint size;
+        public string version;
+        public string path;
+    }
+
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
+    internal struct DotnetEnvironmentFrameworkInfoNative
+    {
+        public nuint size;
+        public string name;
+        public string version;
+        public string path;
+    }
+
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
+    internal struct DotnetEnvironmentInfoNative
+    {
+        public nuint size;
+        public string hostfxr_version;
+        public string hostfxr_commit_hash;
+
+        public nuint sdk_count;
+
+        /// <summary>
+        ///     Pointer to an array of DotnetEnvironmentSdkInfoNative, of length `sdk_count`
+        /// </summary>
+        public IntPtr sdks;
+
+        public nuint framework_count;
+
+        /// <summary>
+        ///     Pointer to an array of DotnetEnvironmentFrameworkInfoNative, of length `framework_count`
+        /// </summary>
+        public IntPtr frameworks;
+    }
+}
diff --git a/WoofWare.DotnetRuntimeLocator/SurfaceBaseline.txt b/WoofWare.DotnetRuntimeLocator/SurfaceBaseline.txt
new file mode 100644
index 0000000..8c34e00
--- /dev/null
+++ b/WoofWare.DotnetRuntimeLocator/SurfaceBaseline.txt
@@ -0,0 +1,47 @@
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo inherit obj, implements WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo System.IEquatable
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo..ctor [constructor]: (string, string, string)
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo.<Clone>$ [method]: unit -> WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo.Deconstruct [method]: (System.String&, System.String&, System.String&) -> unit
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo.get_Name [method]: unit -> string
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo.get_Path [method]: unit -> string
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo.get_Version [method]: unit -> string
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo.Name [property]: string
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo.op_Equality [static method]: (WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo, WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo) -> bool
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo.op_Inequality [static method]: (WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo, WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo) -> bool
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo.Path [property]: string
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo.set_Name [method]: string -> unit
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo.set_Path [method]: string -> unit
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo.set_Version [method]: string -> unit
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo.Version [property]: string
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo inherit obj, implements WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo System.IEquatable
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo..ctor [constructor]: (string, string, WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo System.Collections.Generic.IReadOnlyList, WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo System.Collections.Generic.IReadOnlyList)
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.<Clone>$ [method]: unit -> WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.Deconstruct [method]: (System.String&, System.String&, System.Collections.Generic.IReadOnlyList, System.Collections.Generic.IReadOnlyList) -> unit
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.Frameworks [property]: WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo System.Collections.Generic.IReadOnlyList
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.Get [static method]: unit -> WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.get_Frameworks [method]: unit -> WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo System.Collections.Generic.IReadOnlyList
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.get_HostFxrCommitHash [method]: unit -> string
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.get_HostFxrVersion [method]: unit -> string
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.get_Sdks [method]: unit -> WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo System.Collections.Generic.IReadOnlyList
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.GetSpecific [static method]: System.IO.FileInfo -> WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.HostFxrCommitHash [property]: string
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.HostFxrVersion [property]: string
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.op_Equality [static method]: (WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo, WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo) -> bool
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.op_Inequality [static method]: (WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo, WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo) -> bool
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.Sdks [property]: WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo System.Collections.Generic.IReadOnlyList
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.set_Frameworks [method]: WoofWare.DotnetRuntimeLocator.DotnetEnvironmentFrameworkInfo System.Collections.Generic.IReadOnlyList -> unit
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.set_HostFxrCommitHash [method]: string -> unit
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.set_HostFxrVersion [method]: string -> unit
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo.set_Sdks [method]: WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo System.Collections.Generic.IReadOnlyList -> unit
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo inherit obj, implements WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo System.IEquatable
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo..ctor [constructor]: (string, string)
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo.<Clone>$ [method]: unit -> WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo.Deconstruct [method]: (System.String&, System.String&) -> unit
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo.get_Path [method]: unit -> string
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo.get_Version [method]: unit -> string
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo.op_Equality [static method]: (WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo, WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo) -> bool
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo.op_Inequality [static method]: (WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo, WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo) -> bool
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo.Path [property]: string
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo.set_Path [method]: string -> unit
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo.set_Version [method]: string -> unit
+WoofWare.DotnetRuntimeLocator.DotnetEnvironmentSdkInfo.Version [property]: string
\ No newline at end of file
diff --git a/WoofWare.DotnetRuntimeLocator/Test/Test.fsproj b/WoofWare.DotnetRuntimeLocator/Test/Test.fsproj
new file mode 100644
index 0000000..cea00be
--- /dev/null
+++ b/WoofWare.DotnetRuntimeLocator/Test/Test.fsproj
@@ -0,0 +1,26 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net8.0</TargetFramework>
+        <IsPackable>false</IsPackable>
+      <IsTestProject>true</IsTestProject>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <Compile Include="TestSurface.fs" />
+        <Compile Include="TestDotnetEnvironmentInfo.fs" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="ApiSurface" Version="4.0.40" />
+        <PackageReference Include="FsUnit" Version="6.0.0" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0"/>
+        <PackageReference Include="NUnit" Version="4.1.0"/>
+        <PackageReference Include="NUnit3TestAdapter" Version="4.5.0"/>
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\WoofWare.DotnetRuntimeLocator.csproj" />
+    </ItemGroup>
+
+</Project>
diff --git a/WoofWare.DotnetRuntimeLocator/Test/TestDotnetEnvironmentInfo.fs b/WoofWare.DotnetRuntimeLocator/Test/TestDotnetEnvironmentInfo.fs
new file mode 100644
index 0000000..e892c06
--- /dev/null
+++ b/WoofWare.DotnetRuntimeLocator/Test/TestDotnetEnvironmentInfo.fs
@@ -0,0 +1,19 @@
+namespace WoofWare.DotnetRuntimeLocator.Test
+
+open System
+open FsUnitTyped
+open WoofWare.DotnetRuntimeLocator
+open NUnit.Framework
+
+[<TestFixture>]
+module TestDotnetEnvironmentInfo =
+
+    [<Test>]
+    let ``Can locate the runtime`` () =
+        let runtimes = DotnetEnvironmentInfo.Get ()
+
+        // In the test setup, there should be an SDK!
+        runtimes.Sdks |> Seq.length |> shouldBeGreaterThan 0
+        runtimes.Frameworks |> Seq.length |> shouldBeGreaterThan 0
+
+        Console.WriteLine $"%O{runtimes}"
diff --git a/WoofWare.DotnetRuntimeLocator/Test/TestSurface.fs b/WoofWare.DotnetRuntimeLocator/Test/TestSurface.fs
new file mode 100644
index 0000000..cafcd6c
--- /dev/null
+++ b/WoofWare.DotnetRuntimeLocator/Test/TestSurface.fs
@@ -0,0 +1,23 @@
+namespace WoofWare.DotnetRuntimeLocator.Test
+
+open NUnit.Framework
+open ApiSurface
+
+[<TestFixture>]
+module TestSurface =
+    let assembly = typeof<WoofWare.DotnetRuntimeLocator.DotnetEnvironmentInfo>.Assembly
+
+    [<Test>]
+    let ``Ensure API surface has not been modified`` () = ApiSurface.assertIdentical assembly
+
+    [<Test ; Explicit>]
+    let ``Update API surface`` () =
+        ApiSurface.writeAssemblyBaseline assembly
+
+    [<Test>]
+    let ``Ensure public API is fully documented`` () =
+        DocCoverage.assertFullyDocumented assembly
+
+    [<Test ; Explicit "Not yet published">]
+    let ``Ensure version is monotonic`` () =
+        MonotonicVersion.validate assembly "WoofWare.DotnetRuntimeLocator"
diff --git a/WoofWare.DotnetRuntimeLocator/WoofWare.DotnetRuntimeLocator.csproj b/WoofWare.DotnetRuntimeLocator/WoofWare.DotnetRuntimeLocator.csproj
new file mode 100644
index 0000000..bb04fe1
--- /dev/null
+++ b/WoofWare.DotnetRuntimeLocator/WoofWare.DotnetRuntimeLocator.csproj
@@ -0,0 +1,40 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <LangVersion>latest</LangVersion>
+    <EnableDefaultItems>false</EnableDefaultItems>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <Authors>Patrick Stevens</Authors>
+    <Copyright>Copyright (c) Patrick Stevens 2024</Copyright>
+    <Description>Helpers to locate the .NET runtime and SDKs</Description>
+    <RepositoryType>git</RepositoryType>
+    <RepositoryUrl>https://github.com/Smaug123/WoofWare.DotnetRuntimeLocator</RepositoryUrl>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+    <PackageIcon>logo.png</PackageIcon>
+    <PackageTags>runtime;locate;sdk;list-runtimes;list-sdks</PackageTags>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Include="DotnetEnvironmentFrameworkInfo.cs"/>
+    <Compile Include="DotnetEnvironmentInfo.cs"/>
+    <Compile Include="DotnetEnvironmentSdkInfo.cs"/>
+    <Compile Include="InteropStructs.cs"/>
+    <Compile Include="Boilerplate.cs"/>
+    <EmbeddedResource Include="SurfaceBaseline.txt"/>
+    <EmbeddedResource Include="version.json"/>
+    <None Include="..\README.md">
+      <Pack>True</Pack>
+      <PackagePath>\</PackagePath>
+    </None>
+    <None Include="logo.png">
+      <Pack>True</Pack>
+      <PackagePath>\</PackagePath>
+    </None>
+  </ItemGroup>
+
+</Project>
diff --git a/WoofWare.DotnetRuntimeLocator/logo.png b/WoofWare.DotnetRuntimeLocator/logo.png
new file mode 100644
index 0000000..89f4d2f
Binary files /dev/null and b/WoofWare.DotnetRuntimeLocator/logo.png differ
diff --git a/WoofWare.DotnetRuntimeLocator/version.json b/WoofWare.DotnetRuntimeLocator/version.json
new file mode 100644
index 0000000..bb9aa91
--- /dev/null
+++ b/WoofWare.DotnetRuntimeLocator/version.json
@@ -0,0 +1,10 @@
+{
+  "version": "0.1",
+  "publicReleaseRefSpec": null,
+  "pathFilters": [
+    "^Test/",
+    ":/WoofWare.DotnetRuntimeLocator",
+    ":/Directory.Build.props",
+    ":/README.md"
+  ]
+}
\ No newline at end of file
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..f15c20e
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1717646450,
+        "narHash": "sha256-KE+UmfSVk5PG8jdKdclPVcMrUB8yVZHbsjo7ZT1Bm3c=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "818dbe2f96df233d2041739d6079bb616d3e5597",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..ef41b67
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,66 @@
+{
+  description = "Utilities to help you identify available .NET runtimes";
+
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  };
+
+  outputs = {
+    nixpkgs,
+    flake-utils,
+    ...
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = nixpkgs.legacyPackages.${system};
+      pname = "WoofWare.DotnetRuntimeLocator";
+      dotnet-sdk = pkgs.dotnet-sdk_8;
+      dotnet-runtime = pkgs.dotnetCorePackages.runtime_8_0;
+      version = "0.1";
+      dotnetTool = dllOverride: toolName: toolVersion: sha256:
+        pkgs.stdenvNoCC.mkDerivation rec {
+          name = toolName;
+          version = toolVersion;
+          nativeBuildInputs = [pkgs.makeWrapper];
+          src = pkgs.fetchNuGet {
+            pname = name;
+            version = version;
+            sha256 = sha256;
+            installPhase = ''mkdir -p $out/bin && cp -r tools/net6.0/any/* $out/bin'';
+          };
+          installPhase = let
+            dll =
+              if isNull dllOverride
+              then name
+              else dllOverride;
+          in ''
+            runHook preInstall
+            mkdir -p "$out/lib"
+            cp -r ./bin/* "$out/lib"
+            makeWrapper "${dotnet-runtime}/bin/dotnet" "$out/bin/${name}" --add-flags "$out/lib/${dll}.dll"
+            runHook postInstall
+          '';
+        };
+    in {
+      packages = {
+        fantomas = dotnetTool null "fantomas" (builtins.fromJSON (builtins.readFile ./.config/dotnet-tools.json)).tools.fantomas.version (builtins.head (builtins.filter (elem: elem.pname == "fantomas") ((import ./nix/deps.nix) {fetchNuGet = x: x;}))).sha256;
+        default = pkgs.buildDotnetModule {
+          inherit pname version dotnet-sdk dotnet-runtime;
+          name = "WoofWare.Myriad.Plugins";
+          src = ./.;
+          projectFile = "./WoofWare.DotnetRuntimeLocator/WoofWare.DotnetRuntimeLocator.csproj";
+          testProjectFile = "./WoofWare.DotnetRuntimeLocator/Test/Test.fsproj";
+          nugetDeps = ./nix/deps.nix; # `nix build .#default.passthru.fetch-deps && ./result` and put the result here
+          doCheck = true;
+        };
+      };
+      devShell = pkgs.mkShell {
+        buildInputs = [dotnet-sdk];
+        packages = [
+          pkgs.alejandra
+          pkgs.nodePackages.markdown-link-check
+          pkgs.shellcheck
+        ];
+      };
+    });
+}
diff --git a/nix/deps.nix b/nix/deps.nix
new file mode 100644
index 0000000..d9caa56
--- /dev/null
+++ b/nix/deps.nix
@@ -0,0 +1,224 @@
+# This file was automatically generated by passthru.fetch-deps.
+# Please dont edit it manually, your changes might get overwritten!
+{fetchNuGet}: [
+  (fetchNuGet {
+    pname = "ApiSurface";
+    version = "4.0.40";
+    sha256 = "1c9z0b6minlripwrjmv4yd5w8zj4lcpak4x41izh7ygx8kgmbvx0";
+  })
+  (fetchNuGet {
+    pname = "fantomas";
+    version = "6.3.8";
+    sha256 = "0qfgx08br57sigb8vmpkx9vzsf5bgl86ax7rv4q373ikx3kyrmkl";
+  })
+  (fetchNuGet {
+    pname = "FSharp.Core";
+    version = "8.0.300";
+    sha256 = "158xxr9hnhz2ibyzzp2d249angvxfc58ifflm4g3hz8qx9zxaq04";
+  })
+  (fetchNuGet {
+    pname = "FsUnit";
+    version = "6.0.0";
+    sha256 = "18q3p0z155znwj1l0qq3vq9nh9wl2i4mlfx4pmrnia4czr0xdkmb";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.AspNetCore.App.Ref";
+    version = "6.0.31";
+    sha256 = "0hki4z9x60vzcg53s8cxnig4g1xnpqcj629r2cg5q1xw0sknfp5d";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.AspNetCore.App.Runtime.linux-arm64";
+    version = "6.0.31";
+    sha256 = "0blf8hl2irl9r9x6f7cih87ps21rcs3b8r09z5wp7jcb5j1cv8fg";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.AspNetCore.App.Runtime.linux-x64";
+    version = "6.0.31";
+    sha256 = "050dzfy49c4jwcm8dfrz2lqbbyhmgnq485zdhpcnc3w08z0ppbs6";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.AspNetCore.App.Runtime.osx-arm64";
+    version = "6.0.31";
+    sha256 = "0w4sab66rjjyar9z139ls6rx29gvgj3rp3cbrsc8z00y9mw2sl22";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.AspNetCore.App.Runtime.osx-x64";
+    version = "6.0.31";
+    sha256 = "13kww7x35926wik32z8cnvzhpqp3dwhazkzb569v87x8yww56n3k";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.CodeCoverage";
+    version = "17.10.0";
+    sha256 = "0s0v7jmrq85n356xv7zixvwa4z94fszjcr5vll8x4im1a2lp00f9";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NET.Test.Sdk";
+    version = "17.10.0";
+    sha256 = "13g8fwl09li8fc71nk13dgkb7gahd4qhamyg2xby7am63nlchhdf";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Host.linux-arm64";
+    version = "6.0.31";
+    sha256 = "05s1c6bd4592xhy0y3w0cjckg11hb4pci729v59k3i3hl0hbad4s";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Host.linux-x64";
+    version = "6.0.31";
+    sha256 = "10s0p30qzfn9zibp1ldnqar87hqs47ni3rwqpvwx4jn3589cl9sn";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Host.osx-arm64";
+    version = "6.0.31";
+    sha256 = "0sah1gf2lccc93n3lmkgiahlz4jwr02cw20bvcwqyikpldy2awds";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Host.osx-x64";
+    version = "6.0.31";
+    sha256 = "0k16h1fwnvhw1gcx8ib01bidhrls5m56fiy6wldk3ajgs5dif8i6";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Ref";
+    version = "6.0.31";
+    sha256 = "19a4ainxj8jxij7ckglbmlnvrjxp72xfgx0r6lbglzh9dhsakwm7";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Runtime.linux-arm64";
+    version = "6.0.31";
+    sha256 = "1wmlwzy9bc1fs38r0vpn3ragp8pkimcq6sicj978yhk7brn52z1p";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Runtime.linux-x64";
+    version = "6.0.31";
+    sha256 = "0pw2n3j6vbmbghda1cvkhi3c39a49xk0a4w059mfya017adl6kac";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Runtime.osx-arm64";
+    version = "6.0.31";
+    sha256 = "115c220p0mbk30biaw0sfqprnaghks7lcvvz6n5rsg0kn4fvy7qs";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Runtime.osx-x64";
+    version = "6.0.31";
+    sha256 = "1cl561dgdk4mj48zw5xwg7a0cafkx8j2wjd4nlv0x3di300k75k5";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.Platforms";
+    version = "2.0.0";
+    sha256 = "1fk2fk2639i7nzy58m9dvpdnzql4vb8yl8vr19r2fp8lmj9w2jr0";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.TestPlatform.ObjectModel";
+    version = "17.10.0";
+    sha256 = "07j69cw8r39533w4p39mnj00kahazz38760in3jfc45kmlcdb26x";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.TestPlatform.TestHost";
+    version = "17.10.0";
+    sha256 = "1bl471s7fx9jycr0cc8rylwf34mrvlg9qn1an6l86nisavfcyb7v";
+  })
+  (fetchNuGet {
+    pname = "Nerdbank.GitVersioning";
+    version = "3.6.133";
+    sha256 = "1cdw8krvsnx0n34f7fm5hiiy7bs6h3asvncqcikc0g46l50w2j80";
+  })
+  (fetchNuGet {
+    pname = "Newtonsoft.Json";
+    version = "13.0.1";
+    sha256 = "0fijg0w6iwap8gvzyjnndds0q4b8anwxxvik7y8vgq97dram4srb";
+  })
+  (fetchNuGet {
+    pname = "Newtonsoft.Json";
+    version = "13.0.3";
+    sha256 = "0xrwysmrn4midrjal8g2hr1bbg38iyisl0svamb11arqws4w2bw7";
+  })
+  (fetchNuGet {
+    pname = "NuGet.Common";
+    version = "6.10.0";
+    sha256 = "0nizrnilmlcqbm945293h8q3wfqfchb4xi8g50x4kjn0rbpd1kbh";
+  })
+  (fetchNuGet {
+    pname = "NuGet.Configuration";
+    version = "6.10.0";
+    sha256 = "1aqaknaawnqx4mnvx9qw73wvj48jjzv0d78dzwl7m9zjlrl9myhz";
+  })
+  (fetchNuGet {
+    pname = "NuGet.Frameworks";
+    version = "6.10.0";
+    sha256 = "0hrd8y31zx9a0wps49czw0qgbrakb49zn3abfgylc9xrq990zkqk";
+  })
+  (fetchNuGet {
+    pname = "NuGet.Packaging";
+    version = "6.10.0";
+    sha256 = "18s53cvrf51lihmaqqdf48p2qi6ky1l48jv0hvbp76cxwdg7rba4";
+  })
+  (fetchNuGet {
+    pname = "NuGet.Protocol";
+    version = "6.10.0";
+    sha256 = "0hmv4q0ks9i34mfgpb13l01la9v3jjllfh1qd3aqv105xrqrdxac";
+  })
+  (fetchNuGet {
+    pname = "NuGet.Versioning";
+    version = "6.10.0";
+    sha256 = "1x19njx4x0sw9fz8y5fibi15xfsrw5avir0cx0599yd7p3ykik5g";
+  })
+  (fetchNuGet {
+    pname = "NUnit";
+    version = "4.1.0";
+    sha256 = "0fj6xwgqaxq3mrai86bklclfmjkzf038mrslwfqf4ignaz9f7g5j";
+  })
+  (fetchNuGet {
+    pname = "NUnit3TestAdapter";
+    version = "4.5.0";
+    sha256 = "1srx1629s0k1kmf02nmz251q07vj6pv58mdafcr5dr0bbn1fh78i";
+  })
+  (fetchNuGet {
+    pname = "System.Formats.Asn1";
+    version = "6.0.0";
+    sha256 = "1vvr7hs4qzjqb37r0w1mxq7xql2b17la63jwvmgv65s1hj00g8r9";
+  })
+  (fetchNuGet {
+    pname = "System.IO.Abstractions";
+    version = "4.2.13";
+    sha256 = "0s784iphsmj4vhkrzq9q3w39vsn76w44zclx3hsygsw458zbyh4y";
+  })
+  (fetchNuGet {
+    pname = "System.IO.FileSystem.AccessControl";
+    version = "4.5.0";
+    sha256 = "1gq4s8w7ds1sp8f9wqzf8nrzal40q5cd2w4pkf4fscrl2ih3hkkj";
+  })
+  (fetchNuGet {
+    pname = "System.Reflection.Metadata";
+    version = "1.6.0";
+    sha256 = "1wdbavrrkajy7qbdblpbpbalbdl48q3h34cchz24gvdgyrlf15r4";
+  })
+  (fetchNuGet {
+    pname = "System.Security.AccessControl";
+    version = "4.5.0";
+    sha256 = "1wvwanz33fzzbnd2jalar0p0z3x0ba53vzx1kazlskp7pwyhlnq0";
+  })
+  (fetchNuGet {
+    pname = "System.Security.Cryptography.Pkcs";
+    version = "6.0.4";
+    sha256 = "0hh5h38pnxmlrnvs72f2hzzpz4b2caiiv6xf8y7fzdg84r3imvfr";
+  })
+  (fetchNuGet {
+    pname = "System.Security.Cryptography.ProtectedData";
+    version = "4.4.0";
+    sha256 = "1q8ljvqhasyynp94a1d7jknk946m20lkwy2c3wa8zw2pc517fbj6";
+  })
+  (fetchNuGet {
+    pname = "System.Security.Principal.Windows";
+    version = "4.5.0";
+    sha256 = "0rmj89wsl5yzwh0kqjgx45vzf694v9p92r4x4q6yxldk1cv1hi86";
+  })
+  (fetchNuGet {
+    pname = "System.Text.Encodings.Web";
+    version = "7.0.0";
+    sha256 = "1151hbyrcf8kyg1jz8k9awpbic98lwz9x129rg7zk1wrs6vjlpxl";
+  })
+  (fetchNuGet {
+    pname = "System.Text.Json";
+    version = "7.0.3";
+    sha256 = "0zjrnc9lshagm6kdb9bdh45dmlnkpwcpyssa896sda93ngbmj8k9";
+  })
+]