Support linux install path from src (git-ecosystem#1409)

This PR fix git-ecosystem#1304.

I found that the add func add_to_PATH [1] doesn't persist the path
to the $PATH env variable.

To persist in the current shell is necessary to use a dot or `source`
see doc [2].

_When a script is run using source it runs within the existing shell,
any variables created or modified by the script will remain available
after the script completes. In contrast if the script is run just as
filename, then a separate subshell (with a completely separate set of
variables) would be spawned to run the script._

To persist the PATH among the reboot/new shell, it is necessary to
update the _.profile_ with `echo 'PATH="$PATH:$installPath'
>>~/.profile`.

I don't know if this is the correct behavior, Prior to this commit, it
was working because the `/usr/local/bin` is already in the PATH.

[1]: https://github.com/git-ecosystem/git-credential-manager/blob/afcb6b87302b34d1809a0a057f24c7ba7a3ff5db/src/linux/Packaging.Linux/install-from-source.sh#L94
[2]: https://ss64.com/bash/source.htmlvvvvvvv

Author: ldennington

src/linux/Packaging.Linux/Packaging.Linux.csproj

@@ -9,6 +9,7 @@
 
   <PropertyGroup>
     <InstallFromSource>false</InstallFromSource>
+    <InstallPrefix>/usr/local</InstallPrefix>
   </PropertyGroup>
 
   <ItemGroup>
@@ -23,8 +24,8 @@
   <Import Project="Sdk.targets" Sdk="Microsoft.NET.Sdk" />
 
   <Target Name="CoreCompile" Condition="'$(OSPlatform)'=='linux'">
-    <Message Text="$(MSBuildProjectDirectory)\build.sh --install-from-source=$(InstallFromSource) --configuration='$(Configuration)' --version='$(Version)'" Importance="High" />
-    <Exec Command="$(MSBuildProjectDirectory)\build.sh --install-from-source=$(InstallFromSource) --configuration='$(Configuration)' --version='$(Version)'" />
+    <Message Text="$(MSBuildProjectDirectory)\build.sh --install-from-source=$(InstallFromSource) --configuration='$(Configuration)' --version='$(Version)' --install-prefix='$(InstallPrefix)'" Importance="High" />
+    <Exec Command="$(MSBuildProjectDirectory)\build.sh --install-from-source=$(InstallFromSource) --configuration='$(Configuration)' --version='$(Version)' --install-prefix='$(InstallPrefix)'" />
   </Target>
 
   <Target Name="CoreClean">

src/linux/Packaging.Linux/build.sh

@@ -30,12 +30,21 @@ case "$i" in
     INSTALL_FROM_SOURCE="${i#*=}"
     shift # past argument=value
     ;;
+    --install-prefix=*)
+    INSTALL_PREFIX="${i#*=}"
+    shift # past argument=value
+    ;;
     *)
           # unknown option
     ;;
 esac
 done
 
+# Ensure install prefix exists
+if [! -d "$INSTALL_PREFIX" ]; then
+    mkdir -p "$INSTALL_PREFIX"
+fi
+
 # Perform pre-execution checks
 CONFIGURATION="${CONFIGURATION:=Debug}"
 if [ -z "$VERSION" ]; then
@@ -50,14 +59,11 @@ SYMBOLS="$OUTDIR/payload.sym"
 "$INSTALLER_SRC/layout.sh" --configuration="$CONFIGURATION" || exit 1
 
 if [ $INSTALL_FROM_SOURCE = true ]; then
-    INSTALL_LOCATION="/usr/local"
-    mkdir -p "$INSTALL_LOCATION"
-
-    echo "Installing..."
+    echo "Installing to $INSTALL_PREFIX"
 
     # Install directories
-    INSTALL_TO="$INSTALL_LOCATION/share/gcm-core/"
-    LINK_TO="$INSTALL_LOCATION/bin/"
+    INSTALL_TO="$INSTALL_PREFIX/share/gcm-core/"
+    LINK_TO="$INSTALL_PREFIX/bin/"
 
     mkdir -p "$INSTALL_TO" "$LINK_TO"
 

src/linux/Packaging.Linux/install-from-source.sh

@@ -13,15 +13,30 @@ for i in "$@"; do
         is_ci=true
         shift # Past argument=value
         ;;
+        --install-prefix=*)
+        installPrefix="${i#*=}"
+        shift # past argument=value
+        ;;
     esac
 done
 
+# If install-prefix is not passed, use default value
+if [ -z "$installPrefix" ]; then
+    installPrefix=/usr/local
+fi
+
+# Ensure install directory exists
+if [! -d "$installPrefix" ]; then
+    echo "The folder $installPrefix does not exist"
+    exit
+fi
+
 # In non-ci scenarios, advertise what we will be doing and
 # give user the option to exit.
 if [ -z $is_ci ]; then
     echo "This script will download, compile, and install Git Credential Manager to:
 
-    /usr/local/bin
+    $installPrefix/bin
 
 Git Credential Manager is licensed under the MIT License: https://aka.ms/gcm/license"
 
@@ -225,5 +240,5 @@ if [ -z "$DOTNET_ROOT" ]; then
 fi
 
 cd "$toplevel_path"
-$sudo_cmd env "PATH=$PATH" $DOTNET_ROOT/dotnet build ./src/linux/Packaging.Linux/Packaging.Linux.csproj -c Release -p:InstallFromSource=true
-add_to_PATH "/usr/local/bin"
+$sudo_cmd env "PATH=$PATH" $DOTNET_ROOT/dotnet build ./src/linux/Packaging.Linux/Packaging.Linux.csproj -c Release -p:InstallFromSource=true -p:installPrefix=$installPrefix
+add_to_PATH "$installPrefix/bin"