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test: check if we correctly propagate /run mounts during switch root
Since 7c764d4
we bind mount certain directories during switch root
instead of moving the mount directly, and for /run we do this without
MS_REC. This, unfortunately, leaves all mounts under /run behind
in the old root, which breaks certain use cases.
See: https://github.com/systemd/systemd/issues/28452
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@ -23,4 +23,31 @@ test_append_files() {
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cp -v "$TEST_UNITS_DIR"/{testsuite-01,end}.service "$TEST_UNITS_DIR/testsuite.target" "$dst"
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}
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# Setup a one shot service in initrd that creates a dummy bind mount under /run
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# to check if the mount persists though the initrd transition. The "check" part
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# is in the respective testsuite-01.sh script.
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#
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# See: https://github.com/systemd/systemd/issues/28452
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run_qemu_hook() {
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local extra="$WORKDIR/initrd.extra"
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mkdir -m 755 "$extra"
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mkdir -m 755 "$extra/etc" "$extra/etc/systemd" "$extra/etc/systemd/system" "$extra/etc/systemd/system/initrd.target.wants"
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cat >"$extra/etc/systemd/system/initrd-run-mount.service" <<EOF
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[Unit]
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Description=Create a mount in /run that should survive the transition from initrd
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[Service]
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Type=oneshot
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RemainAfterExit=yes
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ExecStart=sh -xec "mkdir /run/initrd-mount-source /run/initrd-mount-target; mount -v --bind /run/initrd-mount-source /run/initrd-mount-target"
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EOF
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ln -svrf "$extra/etc/systemd/system/initrd-run-mount.service" "$extra/etc/systemd/system/initrd.target.wants/initrd-run-mount.service"
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(cd "$extra" && find . | cpio -o -H newc -R root:root > "$extra.cpio")
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INITRD_EXTRA="$extra.cpio"
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}
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do_test "$@"
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@ -19,6 +19,11 @@ if systemd-detect-virt -q --container; then
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test ! -e /run/systemd/container
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cp -afv /tmp/container /run/systemd/container
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else
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# We should've created a mount under /run in initrd (see the other half of the test)
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# that should've survived the transition from initrd to the real system
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test -d /run/initrd-mount-target
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mountpoint /run/initrd-mount-target
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# We bring the loopback netdev up only during a full setup, so it should
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# not get brought back up during reexec if we disable it beforehand
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[[ "$(ip -o link show lo)" =~ LOOPBACK,UP ]]
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