From c0b975a8e3efacd965ec5166af4d572253f51143 Mon Sep 17 00:00:00 2001
From: Dave Reisner <dreisner@archlinux.org>
Date: Sat, 1 Sep 2012 16:11:54 -0400
Subject: mkinitcpio: refuse to run if image path isn't writeable

Signed-off-by: Dave Reisner <dreisner@archlinux.org>
---
 mkinitcpio | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mkinitcpio b/mkinitcpio
index 5fec347..5bed94e 100755
--- a/mkinitcpio
+++ b/mkinitcpio
@@ -323,6 +323,13 @@ fi
 if [[ -z $GENIMG ]]; then
     msg "Starting dry run: %s" "$KERNELVERSION"
 else
+    # check for permissions. if the image doesn't already exist,
+    # then check the directory
+    if [[ ( -e $GENIMG && ! -w $GENIMG ) ||
+            ( ! -d ${GENIMG%/*} || ! -w ${GENIMG%/*} ) ]]; then
+        die 'Unable to write to %s' "$GENIMG"
+    fi
+
     COMPRESSION=${optcompress:-$COMPRESSION}
     if ! type -P "$COMPRESSION" >/dev/null; then
         die "Unable to locate compression method: %s" "$COMPRESSION"
-- 
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