fix: support older git versions by not using -C (run in directory) option

Author: craigcomstock

build-scripts/revision-file

@@ -58,13 +58,16 @@ for _dir in $_dirs; do
             echo "$(basename "$0"): Debug: Creating revision file in $_dir"
 
             # Get the revision hash
-            R=$(git -C "$BASEDIR/$_dir" log --abbrev=$CORE_ABBREV --pretty='format:%h' -1 -- .) || false
+            R=$(cd "$BASEDIR/$_dir"; git log --abbrev=$CORE_ABBREV --pretty='format:%h' -1 -- .) || false
 
             # Make sure there are no hash collisions
-            if ! git -C "$BASEDIR/$_dir" show "$R" --oneline >/dev/null; then
-                echo "$(basename "$0"): Error: abbreviated commit hash of $CORE_ABBREV is not unique. Consider increasing the value in the script $0."
-                exit 1
-            fi
+            (
+                cd "$BASEDIR/$_dir"
+                if ! git show "$R" --oneline >/dev/null; then
+                    echo "$(basename "$0"): Error: abbreviated commit hash of $CORE_ABBREV is not unique. Consider increasing the value in the script $0"
+                    exit 1
+                fi
+            )
 
             # Create the revision file
             echo "$R" | tr -d '\n' >"$BASEDIR/$_dir/revision"