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test-systemd-tmpfiles: skip when /tmp has unexpected ownership

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The systemd-tmpfiles binary will report a fatal error if /tmp is not owned
either by root, or by the current user:

  Detected unsafe path transition /tmp (owned by nobody) →
    /tmp/test-systemd-tmpfiles.a8qc6n18 (owned by berrange)
    during canonicalization of
    tmp/test-systemd-tmpfiles.a8qc6n18/test-content.7chd7rdi

When doing development inside a 'toolbox' container (which is required
on a Fedora SilverBlue distro), /tmp is owned by 'nobody', because it
has been passed through from the host and host UID 0 gets mapped to
UID 65536 by usernamespaces. This triggers the unsafe path transition
error message.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2023-10-25 17:39:04 +01:00
parent 6aa77f9284
commit 8473ece90e
1 changed files with 8 additions and 0 deletions
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8
test/test-systemd-tmpfiles.py
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@ -31,6 +31,14 @@ except AttributeError:
exe_with_args = sys.argv[1:]
temp_dir = tempfile.TemporaryDirectory(prefix='test-systemd-tmpfiles.')
# If /tmp isn't owned by either 'root' or the current user
# systemd-tmpfiles will exit with "Detected unsafe path transition"
# breaking this test
tmpowner = os.stat("/tmp").st_uid
if tmpowner != 0 and tmpowner != os.getuid():
print("Skip: /tmp is not owned by 'root' or current user")
sys.exit(EXIT_TEST_SKIP)
def test_line(line, *, user, returncode=EX_DATAERR, extra={}):
args = ['--user'] if user else []
print('Running {} on {!r}'.format(' '.join(exe_with_args + args), line))