tree 3ad18dc41350b568c6a4cc1e407ceb6b9962eb33
parent 47804922679c997804283b6dcdb751e087f3eee0
author Don Garrett <dgarrett@google.com> 1395784896 -0700
committer Don Garrett <dgarrett@chromium.org> 1395792201 +0000

Use lazy umount to unmount loopback devices.

This is an attempt to work around crbug.com/353558, which is believed to
be caused by non-atomic umount, which is believed to be a kernel bug.

Switch to using lazy umounts, in the hope that it's a clean(ish) workaround.

Keep retry loops that will keep trying to cleanup the mount point directory
once a minute for up to 10 minutes.

Also, dump mount related debug info after every umount or rmdir failure to
help try and diagnose this.

In addition, if any command returns an error during the cleanup, make the
script return a non-zero exit code. This triggers additional logging in
most call sites for the script.

BUG=chromium:353558
TEST=Local payload generation.

Change-Id: I8ddaf8ddf2f072a404c1aa0ad9cdab84e2a73cbf
Reviewed-on: https://chromium-review.googlesource.com/191524
Tested-by: Don Garrett <dgarrett@chromium.org>
Reviewed-by: David James <davidjames@chromium.org>
Commit-Queue: Don Garrett <dgarrett@chromium.org>