[OE-core] [PATCH v2 01/12] udev-cache: Update cache tarball atomically
Richard Tollerton
rich.tollerton at ni.com
Fri Aug 22 21:30:47 UTC 2014
Overwriting the tarball in-place could cause a partial write, if the
system stops at an inopportune time. This is mitigated by first writing
to a temporary file, then moving that file on top of the final location.
Signed-off-by: Richard Tollerton <rich.tollerton at ni.com>
Signed-off-by: Ben Shelton <ben.shelton at ni.com>
Acked-by: Gratian Crisan <gratian.crisan at ni.com>
---
meta/recipes-core/udev/udev/udev-cache | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/meta/recipes-core/udev/udev/udev-cache b/meta/recipes-core/udev/udev/udev-cache
index db5a513..c08cef2 100644
--- a/meta/recipes-core/udev/udev/udev-cache
+++ b/meta/recipes-core/udev/udev/udev-cache
@@ -16,6 +16,7 @@ export TZ=/etc/localtime
[ -d /sys/class ] || exit 1
[ -f /etc/default/rcS ] && . /etc/default/rcS
+DEVCACHE_TMP="/dev/shm/udev-cache-tmp.tar"
[ -f /etc/default/udev-cache ] && . /etc/default/udev-cache
if [ "$ROOTFS_READ_ONLY" = "yes" ]; then
@@ -25,7 +26,8 @@ fi
if [ "$DEVCACHE" != "" -a -e /dev/shm/udev.cache ]; then
echo "Populating dev cache"
- (cd /; tar cf "$DEVCACHE" dev)
+ (cd /; tar cf "${DEVCACHE_TMP}" dev)
+ mv -f "${DEVCACHE_TMP}" "$DEVCACHE"
mv /dev/shm/udev.cache /etc/udev/cache.data
fi
--
2.0.4
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