Changes done for git subtree installation for git feature which is re…

…lated to features repo issue devcontainers#1143

src/git/install.sh

@@ -7,6 +7,8 @@
 # Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/git-from-src.md
 # Maintainer: The VS Code and Codespaces Teams
 
+set -ex
+
 GIT_VERSION=${VERSION} # 'system' checks the base image first, else installs 'latest'
 USE_PPA_IF_AVAILABLE=${PPA}
 INSTALL_SUBTREE="${INSTALLSUBTREE:-"true"}"
@@ -209,7 +211,12 @@ export DEBIAN_FRONTEND=noninteractive
 if [ ${GIT_VERSION} = "os-provided" ] || [ ${GIT_VERSION} = "system" ]; then
     if type git > /dev/null 2>&1; then
         echo "Detected existing system install: $(git version)"
-        # Clean up
+        if [[ $INSTALL_SUBTREE = "true" ]]; then
+            cd /usr/share/
+            git clone https://github.com/git/git.git
+            cd git/contrib/subtree
+            make && make install && make install-doc && cp git-subtree ../.. 2>&1
+        fi
         clean_up
         exit 0
     fi
@@ -225,6 +232,28 @@ if [ ${GIT_VERSION} = "os-provided" ] || [ ${GIT_VERSION} = "system" ]; then
         check_packages ca-certificates
     fi
     check_packages git
+    if [[ $INSTALL_SUBTREE = "true" ]]; then
+        if ! type make > /dev/null 2>&1; then
+            check_packages make
+        fi    
+        if ! type asciidoc > /dev/null 2>&1; then
+            check_packages asciidoc
+        fi
+        if ! type xmlto > /dev/null 2>&1; then
+            check_packages xmlto
+        fi 
+        if ! type getopt > /dev/null 2>&1; then
+            check_packages getopt
+        fi                           
+        cd /usr/share/
+        git clone https://github.com/git/git.git
+        cd git/contrib/subtree
+        make && make install && make install-doc && cp git-subtree ../.. 2>&1
+        export PATH=$PATH:/usr/share/git
+        # Persist the PATH change by adding it to .bashrc
+        echo 'export PATH=$PATH:/usr/share/git' >> ~/.bashrc
+        echo $PATH
+    fi
     # Clean up
     clean_up
     exit 0