Looking at the changelog this looks suspicious:
- Immediately create "bus" and "class" directories in /sys to fix udev
enumerator (thanks David Lechner)
That change is at
https://github.com/martinpitt/umockdev/commit/5e829601434610ef510bda12571291509a3a51d2
And that explains it, the bolt test code wants to create
/tmp/umockdev.RQBNA1/sys/bus and it already exists.
Offending code in bolt tests is at:
https://gitlab.freedesktop.org/bolt/bolt/-/blob/master/tests/mock-sysfs.c#L183
Checking that theory in the debugger confirms that - breaking just prior
to the failing mkdir.
Good-case
183 r = g_mkdir (bus, 0744);
(gdb) p bus
$4 = 0x5555555be330 "/tmp/umockdev.P7PGA1/sys/bus"
(gdb) shell find /tmp/umockdev.P7PGA1/
/tmp/umockdev.P7PGA1/
/tmp/umockdev.P7PGA1/sys
/tmp/umockdev.P7PGA1/ioctl
/tmp/umockdev.P7PGA1/ioctl/_default
Bad-case
183 r = g_mkdir (bus, 0744);
(gdb) p bus
$4 = 0x5555555be560 "/tmp/umockdev.7MRGA1/sys/bus"
gdb) shell find /tmp/umockdev.7MRGA1/
/tmp/umockdev.7MRGA1/
/tmp/umockdev.7MRGA1/sys
/tmp/umockdev.7MRGA1/sys/bus
/tmp/umockdev.7MRGA1/sys/class
/tmp/umockdev.7MRGA1/ioctl
/tmp/umockdev.7MRGA1/ioctl/_default
So we either need to stop umockdev from doing that (but that will break
whatever it fixed to introduce this) OR we need to teach bolt tests to
be ok, if the directory already exists.
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https://bugs.launchpad.net/bugs/1945321
Title:
umockdev 0.16.3-1 breaks autopkgtest of bolt
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