auto download and install VFSForGit Git on Linux

These scripts are very similar to the Mac versions, but instead
download the gitforlinux.gvfs.installer NuGet package and use
the .deb package it contains to install the VFSForGet-enabled
Git client on Linux.

We also add a PrepFunctionalTests.sh script to use with the
functional test suite.

Scripts/Linux/BuildGVFSForLinux.sh

@@ -41,17 +41,11 @@ if [ ! -d $BUILDDIR ]; then
   mkdir $BUILDDIR || exit 1
 fi
 
-# TODO(Linux): download VFS-enabled version of upstream Git
-#echo 'Downloading a VFS-enabled version of Git...'
-#$VFS_SCRIPTDIR/DownloadGVFSGit.sh || exit 1
+echo 'Downloading a VFS-enabled version of Git...'
+$VFS_SCRIPTDIR/DownloadGVFSGit.sh || exit 1
 GITVERSION="$($VFS_SCRIPTDIR/GetGitVersionNumber.sh)"
-#GITPATH="$(find $VFS_PACKAGESDIR/gitformac.gvfs.installer/$GITVERSION -type f -name *.dmg)" || exit 1
-#echo "Downloaded Git $GITVERSION"
-
-# TODO(Linux): git version based on .dmg filename:
-#   packages/gitformac.gvfs.installer/2.20190724.1/tools/git-2.22.0.vfs.1.1.49.ge8fe4ef9d1-intel-universal-snow-leopard.dmg
-#   downloaded from https://vfsforgit.myget.org/F/build-dependencies/api/v3/flatcontainer/gitformac.gvfs.installer/2.20190724.1/gitformac.gvfs.installer.2.20190724.1.nupkg
-GITPATH="2.22.0.vfs.1.1.49"
+GITPATH="$(find $VFS_PACKAGESDIR/gitforlinux.gvfs.installer/$GITVERSION -type f -name *.deb)" || exit 1
+echo "Downloaded Git $GITVERSION"
 # Now that we have a path containing the version number, generate GVFSConstants.GitVersion.cs
 $VFS_SCRIPTDIR/GenerateGitVersionConstants.sh "$GITPATH" $BUILDDIR || exit 1
 
@@ -89,9 +83,8 @@ done
 # Publish after native build, so installer package can include the native binaries.
 dotnet publish $VFS_SRCDIR/GVFS.sln /p:Configuration=$CONFIGURATION.Linux /p:Platform=x64 -p:CopyPrjFS=true --runtime linux-x64 --framework netcoreapp2.1 --self-contained --output $VFS_PUBLISHDIR /maxcpucount:1 /warnasmessage:MSB4011 || exit 1
 
-# TODO(Linux): copy installer (if any)
-#echo 'Copying Git installer to the output directory...'
-#$VFS_SCRIPTDIR/PublishGit.sh $GITPATH || exit 1
+echo 'Copying Git installer to the output directory...'
+$VFS_SCRIPTDIR/PublishGit.sh $GITPATH || exit 1
 
 echo 'Running VFS for Git unit tests...'
 $VFS_PUBLISHDIR/GVFS.UnitTests || exit 1

Scripts/Linux/DownloadGVFSGit.sh

@@ -4,4 +4,4 @@ BUILDDIR=$VFS_OUTPUTDIR/GVFS.Build
 GITVERSION="$($VFS_SCRIPTDIR/GetGitVersionNumber.sh)"
 cp $VFS_SRCDIR/nuget.config $BUILDDIR
 dotnet new classlib -n Restore.GitInstaller -o $BUILDDIR --force
-dotnet add $BUILDDIR/Restore.GitInstaller.csproj package --package-directory $VFS_PACKAGESDIR GitForMac.GVFS.Installer --version $GITVERSION
+dotnet add $BUILDDIR/Restore.GitInstaller.csproj package --package-directory $VFS_PACKAGESDIR GitForLinux.GVFS.Installer --version $GITVERSION

Scripts/Linux/PrepFunctionalTests.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+. "$(dirname ${BASH_SOURCE[0]})/InitializeEnvironment.sh"
+
+# Install GVFS-aware Git (that was published by the build script)
+GITPUBLISH=$VFS_OUTPUTDIR/Git
+if [[ ! -d $GITPUBLISH ]]; then
+    echo "GVFS-aware Git package not found. Run BuildGVFSForLinux.sh and try again"
+    exit 1
+fi
+GITPKG="$(find $GITPUBLISH -type f -name *.deb)" || exit 1
+sudo apt-get install -y "$GITPKG" || exit 1
+
+# Run ldconfig to ensure libprojfs and libattr are cached for the linker
+sudo ldconfig

Scripts/Linux/PublishGit.sh

@@ -0,0 +1,15 @@
+. "$(dirname ${BASH_SOURCE[0]})/InitializeEnvironment.sh"
+
+GITPATH=$1
+INSTALLER=$(basename $GITPATH)
+
+GITPUBLISH=$VFS_OUTPUTDIR/Git
+if [[ ! -d $GITPUBLISH ]] ; then
+  mkdir $GITPUBLISH
+fi
+
+find $GITPUBLISH -type f ! -name $INSTALLER -delete
+
+if [[ ! -e $GITPUBLISH/$INSTALLER ]] ; then
+  cp $GITPATH $GITPUBLISH
+fi