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nixos/libvirtd-service: fix for garbage collected emulator paths

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libvirtd puts the full path of the emulator binary in the machine config
file. But this path can unfortunately be garbage collected while still
being used by the virtual machine. Then this happens:

Error starting domain: Cannot check QEMU binary /nix/store/z5c2xzk9x0pj6x511w0w4gy9xl5wljxy-qemu-1.5.2-x86-only/bin/qemu-kvm: No such file or directory

Fix by updating the emulator path on each service startup to something
valid (re-scan $PATH).
This commit is contained in:
Bjørn Forsman 2013-11-27 21:31:15 +01:00
parent 89789e4719
commit f52f9bf7cd
1 changed files with 13 additions and 0 deletions
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13
nixos/modules/virtualisation/libvirtd.nix
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@ -101,6 +101,19 @@ in
mkdir -p /etc/$(dirname $i) -m 755
cp -fpd ${pkgs.libvirt}/etc/$i /etc/$i
done
# libvirtd puts the full path of the emulator binary in the machine
# config file. But this path can unfortunately be garbage collected
# while still being used by the virtual machine. So update the
# emulator path on each startup to something valid (re-scan $PATH).
for file in /etc/libvirt/qemu/*.xml; do
# get (old) emulator path from config file
emulator=$(grep "^[[:space:]]*<emulator>" "$file" | sed 's,^[[:space:]]*<emulator>\(.*\)</emulator>.*,\1,')
# get a (definitely) working emulator path by re-scanning $PATH
new_emulator=$(command -v $(basename "$emulator"))
# write back
sed -i "s,^[[:space:]]*<emulator>.*, <emulator>$new_emulator</emulator> <!-- WARNING: emulator dirname is auto-updated by the nixos libvirtd module -->," "$file"
done
''; # */
serviceConfig.ExecStart = ''@${pkgs.libvirt}/sbin/libvirtd libvirtd --config "${configFile}" --daemon --verbose'';