[PATCH] build: fix missing file handling for file_modes

[Paul Spooren]

The `ipkg-build` script uses `file_modes` (-m) to set file modes
during package creation. If a single OpenWrt package results in
multiple `ipk` packages, the `PKG_FILE_MODES` are applied to every
single one of them. This can cause in errors files can be missing
between e.g. a *full* and a *mini* variant.

This commit checks if the file/folder exists, if not a warning is
printed but no longer a positive exit code produced.

Also clean up indention of surrounding lines.

Signed-off-by: Paul Spooren <mail at aparcar.org>
---
 scripts/ipkg-build | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/scripts/ipkg-build b/scripts/ipkg-build
index e3a9a882cf..62b72ada88 100755
--- a/scripts/ipkg-build
+++ b/scripts/ipkg-build
@@ -134,19 +134,24 @@ cd $pkg_dir
 for file_mode in $file_modes; do
 	case $file_mode in
 	/*:*:*:*)
-	    ;;
+		;;
 	*)
-	    echo "ERROR: file modes must use absolute path and contain user:group:mode"
-	    echo "$file_mode"
-	    exit 1
-	    ;;
+		echo "ERROR: file modes must use absolute path and contain user:group:mode"
+		echo "$file_mode"
+		exit 1
+		;;
 	esac
-	path=$(echo "$file_mode" | cut -d ':' -f 1)
-	user_group=$(echo "$file_mode" | cut -d ':' -f 2-3)
-	mode=$(echo "$file_mode" | cut -d ':' -f 4)
 
-	chown "$user_group" "$pkg_dir/$path"
-	chmod  "$mode" "$pkg_dir/$path"
+	path=$(echo "$file_mode" | cut -d ':' -f 1)
+	if [ -e "$pkg_dir/$path" ]; then
+		user_group=$(echo "$file_mode" | cut -d ':' -f 2-3)
+		mode=$(echo "$file_mode" | cut -d ':' -f 4)
+
+		chown "$user_group" "$pkg_dir/$path"
+		chmod "$mode" "$pkg_dir/$path"
+	else
+		echo "WARNING: skip mod change for non existing $path"
+	fi
 done
 $TAR -X $tmp_dir/tarX --format=gnu --sort=name -cpf - --mtime="$TIMESTAMP" . | $GZIP -n - > $tmp_dir/data.tar.gz
 
-- 
2.25.1