scripts/feeds: use git rev-parse for getting revision

It provides simpler output so we don't need extra head and cut commands.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

scripts/feeds

@@ -130,19 +130,19 @@ my %update_method = (
 		'init_commit'   => "git clone '%s' '%s' && cd '%s' && git checkout -b '%s' '%s' && cd -",
 		'update'	=> "git pull --ff",
 		'controldir'	=> ".git",
-		'revision'	=> "git show --abbrev-commit HEAD | head -n 1 | cut -d ' ' -f 2 | tr -d '\n'"},
+		'revision'	=> "git rev-parse --short HEAD | tr -d '\n'"},
 	'src-git-full' => {
 		'init'          => "git clone '%s' '%s'",
 		'init_branch'   => "git clone --branch '%s' '%s' '%s'",
 		'init_commit'   => "git clone '%s' '%s' && cd '%s' && git checkout -b '%s' '%s' && cd -",
 		'update'	=> "git pull --ff",
 		'controldir'	=> ".git",
-		'revision'	=> "git show --abbrev-commit HEAD | head -n 1 | cut -d ' ' -f 2 | tr -d '\n'"},
+		'revision'	=> "git rev-parse --short HEAD | tr -d '\n'"},
 	'src-gitsvn' => {
 		'init'	=> "git svn clone -r HEAD '%s' '%s'",
 		'update'	=> "git svn rebase",
 		'controldir'	=> ".git",
-		'revision'	=> "git show --abbrev-commit HEAD | head -n 1 | cut -d ' ' -f 2 | tr -d '\n'"},
+		'revision'	=> "git rev-parse --short HEAD | tr -d '\n'"},
 	'src-bzr' => {
 		'init'		=> "bzr checkout --lightweight '%s' '%s'",
 		'update'	=> "bzr update",