simple DRY (if non-usual installation)

support/rewrite-hooks.sh

 #!/bin/bash
 
-src="/home/git/repositories"
+home_dir="/home/git"
+src="$home_dir/repositories"
 
 for dir in `ls "$src/"`
 do
@@ -14,22 +15,22 @@ do
     if [[ "$dir" =~ ^.*\.git$ ]]
     then
       project_hook="$src/$dir/hooks/post-receive"
-      gitolite_hook="/home/git/gitlab-shell/hooks/post-receive"
+      gitolite_hook="$home_dir/gitlab-shell/hooks/post-receive"
       ln -s -f $gitolite_hook $project_hook
 
       project_hook="$src/$dir/hooks/update"
-      gitolite_hook="/home/git/gitlab-shell/hooks/update"
+      gitolite_hook="$home_dir/gitlab-shell/hooks/update"
       ln -s -f $gitolite_hook $project_hook
     else
       for subdir in `ls "$src/$dir/"`
       do
         if [ -d "$src/$dir/$subdir" ] && [[ "$subdir" =~ ^.*\.git$ ]]; then
           project_hook="$src/$dir/$subdir/hooks/post-receive"
-          gitolite_hook="/home/git/gitlab-shell/hooks/post-receive"
+          gitolite_hook="$home_dir/gitlab-shell/hooks/post-receive"
           ln -s -f $gitolite_hook $project_hook
 
           project_hook="$src/$dir/$subdir/hooks/update"
-          gitolite_hook="/home/git/gitlab-shell/hooks/update"
+          gitolite_hook="$home_dir/gitlab-shell/hooks/update"
           ln -s -f $gitolite_hook $project_hook
         fi
       done

support/truncate_repositories.sh

 #!/bin/bash
 
+home_dir="/home/git"
+
 echo "Danger!!! Data Loss"
 while true; do
-  read -p "Do you wish to delete all directories (except gitolite-admin.git) from /home/git/repositories/ (y/n) ?:  " yn
+  read -p "Do you wish to delete all directories (except gitolite-admin.git) from $home_dir/repositories/ (y/n) ?:  " yn
   case $yn in
-    [Yy]* ) sh -c "find /home/git/repositories/. -maxdepth 1  -not -name 'gitolite-admin.git' -not -name '.' | xargs sudo rm -rf"; break;;
+    [Yy]* ) sh -c "find $home_dir/repositories/. -maxdepth 1  -not -name 'gitolite-admin.git' -not -name '.' | xargs sudo rm -rf"; break;;
     [Nn]* ) exit;;
     * ) echo "Please answer yes or no.";;
   esac