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nixpkgs/upstart-jobs/filesystems.nix

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Nix

{utillinux, e2fsprogs, fileSystems}:
let
# !!! use XML
mountPoints = map (fs: fs.mountPoint) fileSystems;
devices = map (fs: if fs ? device then fs.device else "LABEL=" + fs.label) fileSystems;
fsTypes = map (fs: if fs ? fsType then fs.fsType else "auto") fileSystems;
optionss = map (fs: if fs ? options then fs.options else "defaults") fileSystems;
autocreates = map (fs: if fs ? autocreate then fs.autocreate else "0") fileSystems;
in
{
name = "filesystems";
job = "
start on startup
start on new-devices
start on ip-up
script
PATH=${e2fsprogs}/sbin:$PATH
mountPoints=(${toString mountPoints})
devices=(${toString devices})
fsTypes=(${toString fsTypes})
optionss=(${toString optionss})
autocreates=(${toString autocreates})
newDevices=1
# If we mount any file system, we repeat this loop, because new
# mount opportunities may have become available (such as images
# for loopback mounts).
while test -n \"$newDevices\"; do
newDevices=
for ((n = 0; n < \${#mountPoints[*]}; n++)); do
mountPoint=\${mountPoints[$n]}
device=\${devices[$n]}
fsType=\${fsTypes[$n]}
options=\${optionss[$n]}
autocreate=\${autocreates[$n]}
isLabel=
if echo \"$device\" | grep -q '^LABEL='; then isLabel=1; fi
isPseudo=
if test \"$fsType\" = \"nfs\" || test \"$fsType\" = \"tmpfs\" ||
test \"$fsType\" = \"ext3cow\"; then isPseudo=1; fi
if ! test -n \"$isLabel\" -o -n \"$isPseudo\" -o -e \"$device\"; then
echo \"skipping $device, doesn't exist (yet)\"
continue
fi
# !!! quick hack: if mount point already exists, try a
# remount to change the options but nothing else.
if cat /proc/mounts | grep -F -q \" $mountPoint \"; then
echo \"remounting $device on $mountPoint\"
${utillinux}/bin/mount -t \"$fsType\" \\
-o remount,\"$options\" \\
\"$device\" \"$mountPoint\" || true
continue
fi
# If $device is already mounted somewhere else, unmount it first.
# !!! Note: we use /etc/mtab, not /proc/mounts, because mtab
# contains more accurate info when using loop devices.
# !!! not very smart about labels yet; should resolve the label somehow.
if test -z \"$isLabel\" -a -z \"$isPseudo\"; then
device=$(readlink -f \"$device\")
prevMountPoint=$(
cat /etc/mtab \\
| grep \"^$device \" \\
| sed 's|^[^ ]\\+ \\+\\([^ ]\\+\\).*|\\1|' \\
)
if test \"$prevMountPoint\" = \"$mountPoint\"; then
echo \"remounting $device on $mountPoint\"
${utillinux}/bin/mount -t \"$fsType\" \\
-o remount,\"$options\" \\
\"$device\" \"$mountPoint\" || true
continue
fi
if test -n \"$prevMountPoint\"; then
echo \"unmount $device from $prevMountPoint\"
${utillinux}/bin/umount \"$prevMountPoint\" || true
fi
fi
echo \"mounting $device on $mountPoint\"
# !!! should do something with the result; also prevent repeated fscks.
if test -z \"$isPseudo\"; then
fsck -a \"$device\" || true
fi
if test \"\$autocreate\" = 1; then mkdir -p \"\$mountPoint\"; fi
if ${utillinux}/bin/mount -t \"$fsType\" -o \"$options\" \"$device\" \"$mountPoint\"; then
newDevices=1
fi
done
done
end script
";
}