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lkl: systemd: use lklfuse lock parameter

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Use an ID_FS_UUID based lock file to avoid duplicate mounts.
If udev doesn't provide an id then use a static noid path, ensuring lock
conflict with any other id-less mount.

Signed-off-by: David Disseldorp <ddiss@suse.de>
This commit is contained in:
David Disseldorp
2025-07-02 10:13:31 +02:00
parent 29e4402a82
commit 5a7149cfd7
1 changed files with 6 additions and 2 deletions
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8
tools/lkl/systemd/lklfuse-mount@.service
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@@ -6,6 +6,7 @@ Requires=modprobe@fuse.service
[Service]
RuntimeDirectory=lklfuse-%i
StateDirectory=lklfuse/fsid-mutex
# The "allow_other" mount option permits fuse mount access by users other than
# the lklfuse user, and requires a "user_allow_other" setting in fuse3.conf
Environment=LKLFUSE_ARGS="-s -oallow_other"
@@ -18,8 +19,11 @@ EnvironmentFile=-/etc/lklfuse.conf
# run as unprivileged user
User=lklfuse
Group=lklfuse
ExecCondition=/bin/bash -c "udevadm info -q env -x --property=ID_FS_TYPE -n \"%I\" > ${RUNTIME_DIRECTORY}/udev.env"
ExecStart=/bin/bash -c ". ${RUNTIME_DIRECTORY}/udev.env; rm ${RUNTIME_DIRECTORY}/udev.env; /usr/bin/lklfuse -f -ofsname=\"/dev/%I\",subtype=\"lkl.$ID_FS_TYPE\",type=\"$ID_FS_TYPE\" $LKLFUSE_ARGS \"/dev/%I\" $RUNTIME_DIRECTORY"
ExecCondition=/bin/bash -xc "udevadm info -q env -x --property=ID_FS_TYPE,ID_FS_UUID -n \"%I\" > ${RUNTIME_DIRECTORY}/udev.env"
# Use an ID_FS_UUID based lock file to avoid duplicate mounts.
# If udev doesn't provide an id then use a static noid path, ensuring lock
# conflict with any other id-less mount.
ExecStart=/bin/bash -xc ". ${RUNTIME_DIRECTORY}/udev.env; rm ${RUNTIME_DIRECTORY}/udev.env; /usr/bin/lklfuse -f -ofsname=\"/dev/%I\",subtype=\"lkl.$ID_FS_TYPE\",type=\"$ID_FS_TYPE\",lock=\"${STATE_DIRECTORY}/${ID_FS_UUID:-noid}\" $LKLFUSE_ARGS \"/dev/%I\" ${RUNTIME_DIRECTORY}"
[Install]
WantedBy=default.target