From 38adb8d0ac6eebbeb5e26d2095526c3ba9459d7a Mon Sep 17 00:00:00 2001
From: Tom Willemse
Date: Sun, 24 Nov 2013 23:04:18 +0100
Subject: Add blog posts

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 articles/mounting_music_dir_before_mpd.org | 44 ++++++++++++++++++++++++++++++
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 create mode 100644 articles/mounting_music_dir_before_mpd.org

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