[PATCH] sstate.bbclass: check if mirror directory is writable

[Ed Bartosh <ed.bartosh@linux.intel.com>]

Commit 51edde653707e7a3cd2186082458f01f32cd1996 makes a wrong assumption
that SSTATE_MIRRORS have write permissions.

A mirror is by definition outside of it's user control. In my use case
it happens I does not have permissions to update the access time of the
dereferenced symbolic-link file.

Checked if file is writable before changing its atime.

Thanks to Paulo Neves for the patch.

[YOCTO #11307]

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
---
 meta/classes/sstate.bbclass | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/classes/sstate.bbclass b/meta/classes/sstate.bbclass
index bc0ec54..5b66c01 100644
--- a/meta/classes/sstate.bbclass
+++ b/meta/classes/sstate.bbclass
@@ -753,7 +753,7 @@ python sstate_sign_package () {
 sstate_unpack_package () {
 	tar -xvzf ${SSTATE_PKG}
 	# update .siginfo atime on local/NFS mirror
-	[ -h ${SSTATE_PKG}.siginfo ] && touch -a ${SSTATE_PKG}.siginfo
+	[ -w ${SSTATE_PKG}.siginfo ] && [ -h ${SSTATE_PKG}.siginfo ] && touch -a ${SSTATE_PKG}.siginfo
 	# Use "! -w ||" to return true for read only files
 	[ ! -w ${SSTATE_PKG} ] || touch --no-dereference ${SSTATE_PKG}
 	[ ! -w ${SSTATE_PKG}.sig ] || [ ! -e ${SSTATE_PKG}.sig ] || touch --no-dereference ${SSTATE_PKG}.sig
-- 
2.1.4