40 lines
1.5 KiB
Text
40 lines
1.5 KiB
Text
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;;;;;
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title: Mounting music dir before MPD
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tags: systemd, mpd, config
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date: 2013-11-24 14:03
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format: md
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;;;;;
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Systemd allows you to specify a program to run before running the main
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daemon (or program) with `ExecStartPre`. This can, for instance, be
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used to run a mount command before starting `mpd`. By adding under the
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`[Service]` heading:
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ExecStartPre=/usr/bin/mount /mnt/music
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Now I have already setup my `fstab` to know what to mount on
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`/mnt/music`, but of course that shouldn't be necessary. According to
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the `systemd.service(5)` man page it uses the same syntax as
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`ExecStart`, which tells us that one must use absolute file names
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since no shell is used to start them.
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This also has the effect of stopping the `ExecStart` part from the
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`.service` from being executed if the `ExecStartPre` doesn't finish
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successfully. Which works out great in my case as I don't want to
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start `mpd` if my music directory didn't mount. If you want to ignore
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the exit status of (one of) the `ExecStartPre` commands you can prefix
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it with a `-`, for example:
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ExecStartPre=-/usr/bin/mount /mnt/music
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Which would continue running the `ExecStart` even if mounting failed.
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Also know that there can be multiple `ExecStartPre` options and they
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will be executed serially, so for example:
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ExecStartPre=/usr/bin/mount /mnt/music
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ExecStartPre=-/usr/bin/mount /mnt/music2
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This would fail if `/mnt/music` doesn't mount, but would continue just
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fine if `/mnt/music` did and `/mnt/music2` didn't.
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