Merge pull request #568 from ddiss/lklfuse_udev_systemd

lkl: systemd: add example udev and systemd service files

tools/lkl/systemd/61-lklfuse.rules

@@ -0,0 +1,18 @@
+SUBSYSTEM!="block", SUBSYSTEMS!="usb", GOTO="lklfuse_end"
+#TAG+="lklfuse-dbg-block-filter"
+# XXX remove should be handled by systemd service ConditionPathExists for %k
+# device node, but it doesn't appear to work, so manually stop.
+ACTION=="remove", TAG+="lklfuse-dbg-got-remove", \
+  RUN+="/usr/bin/systemctl stop lklfuse-mount@%k", GOTO="lklfuse_end"
+#TAG+="lklfuse-dbg-remove-filter"
+
+# only support a subset of filesystems on USB devices for now. Btrfs omitted
+# from the default set, as lklfuse lacks multi-device support.
+ENV{ID_FS_TYPE}!="vfat|exfat|xfs|ext4|ext3|ext2", GOTO="lklfuse_end"
+#TAG+="lklfuse-dbg-fs-filter"
+
+ACTION=="add", TAG+="systemd", \
+  OWNER="lklfuse", GROUP="lklfuse", ENV{UDISKS_IGNORE}="1", \
+  ENV{SYSTEMD_WANTS}+="lklfuse-mount@%k.service"
+
+LABEL="lklfuse_end"

tools/lkl/systemd/lklfuse-mount@.service

@@ -0,0 +1,25 @@
+[Unit]
+Description=EXPERIMENTAL: Mount a storage device via lklfuse
+ConditionPathExists=/dev/%I
+After[email protected]
+Requires[email protected]
+
+[Service]
+RuntimeDirectory=lklfuse-%i
+# 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"
+# Override LKLFUSE_ARGS in the EnvironmentFile if desired. See lklfuse --help
+EnvironmentFile=-/etc/lklfuse.conf
+# The following sandboxing works, but the mountpoint is in a new mount namespace
+#ProtectSystem=strict
+#ProtectHome=true
+#PrivateNetwork=true
+# 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"
+
+[Install]
+WantedBy=default.target