45 lines
1.6 KiB
Org Mode
45 lines
1.6 KiB
Org Mode
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#+TITLE:
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#+OPTIONS: toc:nil c:t
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#+HTML_LINK_UP: ../blog.html
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* Mounting music dir before MPD :systemd:mpd:conf:
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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 used
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to run a mount command before starting ~mpd~. By adding under the
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=[Service]= heading:
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#+BEGIN_SRC conf-unix
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ExecStartPre=/usr/bin/mount /mnt/music
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#+END_SRC
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Now I have already setup my ~fstab~ to know what to mount on ~/mnt/music~,
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but of course that shouldn't be necessary. According to the
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~systemd.service(5)~ man page it uses the same syntax as =ExecStart=,
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which tells us that one must use absolute file names since no shell is
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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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#+BEGIN_SRC conf-unix
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ExecStartPre=-/usr/bin/mount /mnt/music
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#+END_SRC
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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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#+BEGIN_SRC conf-unix
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ExecStartPre=/usr/bin/mount /mnt/music
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ExecStartPre=-/usr/bin/mount /mnt/music2
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#+END_SRC
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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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