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Some filesystem tests are failing when their image is prepared with
guestmount, but succeeding if loop mounts are used instead. The reason
seems to be a race condition the guestmount(1) manual page explains:
When guestunmount(1)/fusermount(1) exits, guestmount may still be
running and cleaning up the mountpoint. The disk image will not be
fully finalized.
This means that scripts like the following have a nasty race condition:
guestmount -a disk.img -i /mnt
# copy things into /mnt
guestunmount /mnt
# immediately try to use 'disk.img' ** UNSAFE **
The solution is to use the --pid-file option to write the guestmount
PID to a file, then after guestunmount spin waiting for this PID to
exit.
The Python standard library has an os.waitpid() function for waiting a
child to terminate, but it cannot wait on non-child processes. Implement
a utility function that can do this by polling the process repeatedly
for a given duration, optionally killing the process if it won't
terminate on its own. Apply the suggested solution with this utility
function, which makes the failing tests succeed again.
Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
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| .. | ||
| cmd | ||
| dm | ||
| env | ||
| fs | ||
| image | ||
| lib | ||
| log | ||
| optee | ||
| overlay | ||
| py | ||
| stdint | ||
| trace | ||
| bloblist.c | ||
| bootm.c | ||
| cmd_ut.c | ||
| command_ut.c | ||
| common.sh | ||
| compression.c | ||
| Kconfig | ||
| Makefile | ||
| nokia_rx51_test.sh | ||
| print_ut.c | ||
| run | ||
| str_ut.c | ||
| test-main.c | ||
| time_ut.c | ||
| unicode_ut.c | ||
| ut.c | ||