get_gear_rules: move path-to-spec support to get_root_git_dir

share/eterbuild/functions/common

@@ -294,7 +294,8 @@ get_root_git_dir()
         which git >/dev/null 2>/dev/null || return 0
 
         if [ -n "$LOCDIR" ] ; then
-            cd "$LOCDIR" || fatal "Only dir arg allowed for get_root_git_dir"
+            [ -f "$LOCDIR" ] && LOCDIR=$(dirname "$LOCDIR")
+            cd "$LOCDIR" || fatal "get_root_git_dir: dir $LOCDIR does not exists"
         fi
 
         DIR=$(git rev-parse --git-dir 2>/dev/null)/../

share/eterbuild/functions/gear

@@ -8,8 +8,7 @@ get_gear_rules()
 {
 	local DIR="$1"
 	[ -z "$IGNOREGEAR" ] || return 1
-	[ -f "$DIR" ] && DIR=$(dirname "$DIR")
-	local GITDIR=$(get_root_git_dir $DIR)
+	local GITDIR=$(get_root_git_dir "$DIR")
 	local rules="$GITDIR/.gear/rules"
 	[ -r "$rules" ] || rules="$GITDIR/.gear-rules"
 	[ -r "$rules" ] || return