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This uses openssh 9.4's -W support for AF_UNIX. Unfortunately older versions
don't work with this, and I couldn#t figure a way that would work for
older versions too, would not be racy and where we'd still could keep
track of the forked off ssh process.
Unfortunately, on older versions -W will just hang (because it tries to
resolve the AF_UNIX path as regular host name), which sucks, but hopefully this
issue will go away sooner or later on its own, as distributions update.
Fedora is still stuck at 9.3 at the time of posting this (even on
Fedora), even though 9.4, 9.5, 9.6 have all already been released by
now.
Example:
varlinkctl call -j ssh:root@somehost:/run/systemd/io.systemd.Credentials io.systemd.Credentials.Encrypt '{"text":"foobar"}'
(Hopefully) a temporary workaround for #30573 where starting a user
session when PID 1 is rate limited stalls even after it leaves the rate
limited state:
[ 11.658201] H systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=UnitRemoved cookie=4208 reply_cookie=0 signature=so error-name=n/a error-mes>
[ 11.658233] H systemd[1]: Event source 0x559babdd8bb0 (mount-monitor-dispatch) left rate limit state.
[ 101.562697] H busctl[784]: Failed to get credentials: Transport endpoint is not connected
[ 101.563480] H systemd[1]: systemd-journald.service: Got notification message from PID 300 (WATCHDOG=1)
[ 101.563725] H testsuite-74.sh[784]: BusAddress=unixexec:path=systemd-run,argv1=-M.host,argv2=-PGq,argv3=--wait,argv4=-pUser%3dtestuser,argv5=-pPAMName%3dlogin,argv6=systemd-stdio-bridge,argv7=-punix:path%3d%24%7bXDG_RUNTIME_DIR%7d/bus
[ 101.564136] H systemd[1]: Successfully forked off '(sd-expire)' as PID 787.
[ 101.564754] H systemd[1]: Successfully forked off '(sd-expire)' as PID 788.
[ 101.564831] H testsuite-74.sh[381]: + echo 'Subtest /usr/lib/systemd/tests/testdata/units/testsuite-74.busctl.sh failed'
The issue appeared after ee07fff03b which does a bunch of mounts/umounts
that get PID 1 into a rate limited state, and is frequent enough to be
annoying, so let's temporarily bump the rate limit to alleviate that.
systemd-nspawn doesn't like invalid machine IDs and refuses to boot with one:
TEST-74-AUX-UTILS RUN: Tests for auxiliary utilities
...
Spawning container TEST-74-AUX-UTILS--3 on /var/tmp/systemd-test-TEST-74-AUX-UTILS_3/root.
Press Ctrl-] three times within 1s to kill container.
Failed to read machine ID from container image: Structure needs cleaning
E: nspawn failed with exit code 1
Follow-up to b4d42a82eb.
