Public bug reported:
virt-builder cannot build VM image as it uses locally installed /sbin
/dhclient-script. dhclient-script tries to find out whether / is RW and
reads /etc/fstab. Issue is that it does not exists in supermin machine
which virt-builder uses and it end up in an endless loop of messages:
...
/sbin/dhclient-script: 31: /sbin/dhclient-script: cannot open /etc/fstab: No
such file
RTNETLINK answers: File exists
/sbin/dhclient-script: 31: /sbin/dhclient-script: cannot open /etc/fstab: No
such file
RTNETLINK answers: File exists
/sbin/dhclient-script: 31: /sbin/dhclient-script: cannot open /etc/fstab: No
such file
RTNETLINK answers: File exists
/sbin/dhclient-script: 31: /sbin/dhclient-script: cannot open /etc/fstab: No
such file
RTNETLINK answers: File exists
/sbin/dhclient-script: 31: /sbin/dhclient-script: cannot open /etc/fstab: No
such file
^C
WARNING: CTRL+C pressed!!!
How to reproduce the bug (on 16.04):
~# apt install libguestfs-tools
~# virt-builder debian-8 --root-password password:xxx --hostname testvm
--format qcow2 -v
Proposed solution:
Do not use /etc/fstab for finding out the state of / in dhclient-script, but
use /proc/mounts instead of it. It makes more sense as it shows real state of
filesystems and it exists on supermin machines, so virt-builder runs flawlessly.
Patch:
--- /sbin/dhclient-script.orig 2016-12-12 14:48:18.062438451 +0100
+++ /sbin/dhclient-script 2016-12-12 14:53:24.897500263 +0100
@@ -28,7 +28,7 @@
wait_for_rw() {
local file=$1
# Find out whether we are going to mount / rw
- exec 9>&0 </etc/fstab
+ exec 9>&0 </proc/mounts
rootmode=rw
while read dev mnt type opts dump pass junk; do
[ "$mnt" != / ] && continue
After you apply the patch delete virt-builder cache by deleting of
/var/tmp/.guestfs-* directories and run virt-builder again.
Description: Ubuntu 16.04.1 LTS
Release: 16.04
libguestfs-tools 1:1.32.2-4ubuntu2
isc-dhcp-client 4.3.3-5ubuntu12.3
** Affects: isc-dhcp (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1649280
Title:
virt-builder stucks in endless loop due to /sbin/dhclient-script
failure
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