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lib/deploy: Really close testing race condition

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I added `waitpid()`, but that didn't actually help because we were
`daemon()`izing. Don't daemonize if we're testing so that we can `waitpid()`.

Note I still haven't reproduced this race locally, but I'm pretty sure this will
fix it.

While here, actually check the return value from `waitpid()` just in case
something goes wrong there.

Closes: #1084
Approved by: jlebon
This commit is contained in:
Colin Walters 2017-08-16 12:18:22 -04:00 committed by Atomic Bot
parent eb35821a51
commit ba28684ac2
1 changed files with 11 additions and 4 deletions
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15
src/libostree/ostree-sysroot-deploy.c
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@ -1020,10 +1020,14 @@ fsfreeze_thaw_cycle (OstreeSysroot *self,
(void) close (glnx_steal_fd (&sock_parent));
/* Daemonize, and mask SIGINT/SIGTERM, so we're likely to survive e.g.
* someone doing a `systemctl restart rpm-ostreed` or a Ctrl-C of
* `ostree admin upgrade`.
* `ostree admin upgrade`. We don't daemonize though if testing so
* that we can waitpid().
*/
if (daemon (0, debug_fifreeze ? 1 : 0) < 0)
err (1, "daemon");
if (!debug_fifreeze)
{
if (daemon (0, 0) < 0)
err (1, "daemon");
}
int sigs[] = { SIGINT, SIGTERM };
for (guint i = 0; i < G_N_ELEMENTS (sigs); i++)
{
@ -1086,7 +1090,10 @@ fsfreeze_thaw_cycle (OstreeSysroot *self,
{
int wstatus;
/* Ensure the child has written its data */
(void) TEMP_FAILURE_RETRY (waitpid (pid, &wstatus, 0));
if (TEMP_FAILURE_RETRY (waitpid (pid, &wstatus, 0)) < 0)
return glnx_throw_errno_prefix (error, "waitpid(test-fifreeze)");
if (!g_spawn_check_exit_status (wstatus, error))
return glnx_prefix_error (error, "test-fifreeze: ");
return glnx_throw (error, "aborting due to test-fifreeze");
}
/* Do a freeze/thaw cycle; TODO add a FIFREEZETHAW ioctl */