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systemd

Start mergerfs after some arbitrary script

prep script

/usr/local/bin/prepare-for-mergerfs

#!/usr/bin/env sh

# Setup things
# Wait for things
/bin/sleep 10

# Report back to systemd that things are ready
/bin/systemd-notify --ready

prep script system service

/etc/systemd/system/prepare-for-mergerfs.service

[Unit]
Description=Dummy mount service

[Service]
Type=notify
RemainAfterExit=yes
ExecStart=/usr/local/bin/prepare-for-mergerfs

[Install]
WantedBy=default.target

mergerfs systemd service

/etc/systemd/system/mergerfs.service

[Unit]
Description=Dummy mergerfs service
Requires=prepare-for-mergerfs.service
After=prepare-for-mergerfs.service

[Service]
Type=simple
KillMode=none
ExecStart=/usr/bin/mergerfs \
  -f \
  -o OPTIONS \
  /mnt/filesystem0:/mnt/filesystem1 \
  /mnt/mergerfs
ExecStop=/bin/fusermount -uz /mnt/mergerfs
Restart=on-failure

[Install]
WantedBy=default.target