nixos/libvirtd-service: fix fail-to-start when no machines are configured
Don't fail to start the libvirtd service just because there are no files that match the /etc/libvirt/qemu/*.xml pattern.
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@ -107,6 +107,7 @@ in
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# while still being used by the virtual machine. So update the
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# emulator path on each startup to something valid (re-scan $PATH).
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for file in /etc/libvirt/qemu/*.xml; do
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test -f "$file" || continue
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# get (old) emulator path from config file
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emulator=$(grep "^[[:space:]]*<emulator>" "$file" | sed 's,^[[:space:]]*<emulator>\(.*\)</emulator>.*,\1,')
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# get a (definitely) working emulator path by re-scanning $PATH
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