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core: Add RootDirectoryFileDescriptor=

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RootDirectory= but via a open_tree() file descriptor. This allows
setting up the execution environment for a service by the client in
a mount namespace and then starting a transient unit in that execution
environment using the new property.

We also add --root-directory= and --same-root-dir= to systemd-run to
have it run services within the given root directory. As systemd-run
might be invoked from a different mount namespace than what systemd is
running in, systemd-run opens the given path with open_tree() and then
sends it to systemd using the new RootDirectoryFileDescriptor= property.
This commit is contained in:
Daan De Meyer
2025-10-28 23:47:26 +01:00
parent 456ee3c5f9
commit 9e26ced980
15 changed files with 162 additions and 10 deletions
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test/units/TEST-50-DISSECT.dissect.sh
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@@ -890,6 +890,9 @@ systemctl stop test-root-ephemeral
timeout 10 bash -c 'until test -z "$(ls -A /var/lib/systemd/ephemeral-trees)"; do sleep .5; done'
test ! -f /tmp/img/abc
# Test RootDirectoryFileDescriptor=
systemd-run --wait --pipe --root-directory=/tmp/img -- grep -q 'MARKER=1' /usr/lib/os-release
systemd-dissect --mtree /tmp/img >/dev/null
systemd-dissect --list /tmp/img >/dev/null