Adds support for run once commands

Self-hosting of the tool now checks if it is already built
Integrations only need to be triggered once and while the state isn't saved per call to `dotnet`, this prevents it re-triggering for multiple projects in the solution.

Author: Turnerj

src/TurnerSoftware.BuildVersioning.Tool/TurnerSoftware.BuildVersioning.Tool.csproj

@@ -8,8 +8,9 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <SelfHostedBuildVersioning Condition="'$(DesignTimeBuild)' != 'true' AND '$(SkipBuildVersioning)' != 'true'">true</SelfHostedBuildVersioning>
-    <BuildVersioningToolPath>../../TurnerSoftware.BuildVersioning.Tool/bin/$(Configuration)/$(TargetFramework)/TurnerSoftware.BuildVersioning.Tool.dll</BuildVersioningToolPath>
+    <BuildVersioningToolPath>bin/$(Configuration)/$(TargetFramework)/TurnerSoftware.BuildVersioning.Tool.dll</BuildVersioningToolPath>
+    <SelfHostedBuildVersioning Condition="$(DesignTimeBuild) != 'true' AND $(SkipBuildVersioning) != 'true' AND !Exists($(BuildVersioningToolPath))">true</SelfHostedBuildVersioning>
+    <BuildVersioningToolPath>../../TurnerSoftware.BuildVersioning.Tool/$(BuildVersioningToolPath)</BuildVersioningToolPath>
   </PropertyGroup>
 
   <ItemGroup>
@@ -18,9 +19,6 @@
 
   <!-- Self-hosting Support -->
   <Import Project="../TurnerSoftware.BuildVersioning/build/TurnerSoftware.BuildVersioning.targets" Condition="$(SelfHostedBuildVersioning) == 'true'" />
-  <PropertyGroup Condition="$(SelfHostedBuildVersioning) == 'true'">
-    <BuildVersioningToolPath>../../TurnerSoftware.BuildVersioning.Tool/bin/$(Configuration)/$(TargetFramework)/TurnerSoftware.BuildVersioning.Tool.dll</BuildVersioningToolPath>
-  </PropertyGroup>
   <Target Name="_SelfHostedBuildVersioning" BeforeTargets="BeforeBuild" Condition="$(SelfHostedBuildVersioning) == 'true'">
     <Message Importance="high" Text="BuildVersioning-SelfHosting: Establishing a baseline build to provide versioning support" />
     <Exec Command="dotnet build TurnerSoftware.BuildVersioning.Tool.csproj -c $(Configuration) -v quiet --nologo /p:SkipBuildVersioning=true" StandardOutputImportance="low"></Exec>

src/TurnerSoftware.BuildVersioning/build/TurnerSoftware.BuildVersioning.Integrations.targets

@@ -10,7 +10,10 @@
     <BuildPreReleaseFormat Condition="$(GITHUB_REF.Split('/')[1]) == 'pull'">pr.$(GITHUB_REF.Split('/')[2])</BuildPreReleaseFormat>
     <BuildMetadataFormat>{CommitHash}-github.$(GITHUB_RUN_ID)</BuildMetadataFormat>
   </PropertyGroup>
-  <Target Name="_BuildVersioningWithGitHub" BeforeTargets="BeforeBuild" Condition="$(BuildVersioningWithGitHub) == 'true' AND $(GITHUB_RUN_ID) != ''">
+  <Target Name="_BuildVersioningWithGitHub" BeforeTargets="BeforeBuild" Condition="$(BuildVersioningWithGitHub) == 'true' AND $(GITHUB_RUN_ID) != '' AND !$(_BuildVersioningRunOne.Contains('github'))">
+    <PropertyGroup>
+      <_BuildVersioningRunOnce>$(_BuildVersioningRunOnce)github;</_BuildVersioningRunOnce>
+    </PropertyGroup>
     <Message Importance="$(BuildVersioningLogLevel)" Text="BuildVersioning-GitHubIntegration: Fetching tags for versioning as they aren't available by default in GitHub Actions" />
     <Exec Command="git fetch --prune --unshallow --tags --quiet" IgnoreExitCode="true" StandardErrorImportance="low" StandardOutputImportance="low" />
   </Target>
@@ -19,7 +22,10 @@
     <BuildPreReleaseFormat Condition="$(APPVEYOR_PULL_REQUEST_NUMBER) != ''">pr.$(APPVEYOR_PULL_REQUEST_NUMBER)</BuildPreReleaseFormat>
     <BuildMetadataFormat>{CommitHash}-appveyor.$(APPVEYOR_BUILD_ID)</BuildMetadataFormat>
   </PropertyGroup>
-  <Target Name="_BuildVersioningWithAppVeyor" AfterTargets="BuildVersioning" Condition="$(BuildVersioningWithAppVeyor) == 'true' AND $(APPVEYOR) != ''">
+  <Target Name="_BuildVersioningWithAppVeyor" AfterTargets="BuildVersioning" Condition="$(BuildVersioningWithAppVeyor) == 'true' AND $(APPVEYOR) != '' AND !$(_BuildVersioningRunOne.Contains('appveyor'))">
+    <PropertyGroup>
+      <_BuildVersioningRunOnce>$(_BuildVersioningRunOnce)appveyor;</_BuildVersioningRunOnce>
+    </PropertyGroup>
     <Message Importance="$(BuildVersioningLogLevel)" Text="BuildVersioning-AppVeyorIntegration: Updating AppVeyor build name to $(BuildFullVersion)" />
     <Exec Command="powershell Update-AppveyorBuild -Version $(BuildFullVersion)" />
   </Target>