[Bug 1632405] [NEW] virt-customize enters infinite loop: dhclient-script: cannot open /etc/fstab

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When running virt-customize against an existing raw image, it seems to
hang and do nothing.  With verbose flag passed the logs are filled with:

/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
RTNETLINK answers: File exists
/sbin/dhclient-script: 31: /sbin/dhclient-script: cannot open /etc/fstab: No such file

over and over again.

$ dpkg -l | grep guestfs
ii  libguestfs-hfsplus:amd64              1:1.32.2-4ubuntu2                          amd64        guest disk image management system - HFS+ support
ii  libguestfs-perl                       1:1.32.2-4ubuntu2                          amd64        guest disk image management system - Perl bindings
ii  libguestfs-reiserfs:amd64             1:1.32.2-4ubuntu2                          amd64        guest disk image management system - ReiserFS support
ii  libguestfs-rescue:amd64               1:1.32.2-4ubuntu2                          amd64        guest disk image management system - virt-rescue enhancements
ii  libguestfs-rsync:amd64                1:1.32.2-4ubuntu2                          amd64        guest disk image management system - rsync support
ii  libguestfs-tools                      1:1.32.2-4ubuntu2                          amd64        guest disk image management system - tools
ii  libguestfs-xfs:amd64                  1:1.32.2-4ubuntu2                          amd64        guest disk image management system - XFS support
ii  libguestfs0:amd64                     1:1.32.2-4ubuntu2                          amd64        guest disk image management system - shared library

$ lsb_release -rd
Description:	Ubuntu 16.04.1 LTS
Release:	16.04

According to
https://answers.launchpad.net/ubuntu/+source/libguestfs/+question/372927
this is fixed in 1.34, though I haven't verified this for myself.

******************SRU TEMPLATE******************
[Impact]

On Xenial libguestfs fails to configure network and gets into infinite loop,
because /etc/fstab file is not present which is required by dhclient-script.
Currently the libguestfs version for xenial is 1.32.2-4ubuntu2 which misses
the upstream commit [1] that solves the problem.

[Test Case]

$ lsb_release -rd
Description:	Ubuntu 16.04.5 LTS
Release:	16.04

$ dpkg -l | grep guest
ii  libguestfs-hfsplus:amd64                   1:1.32.2-4ubuntu2                            amd64        guest disk image management system - HFS+ support
ii  libguestfs-perl                            1:1.32.2-4ubuntu2                            amd64        guest disk image management system - Perl bindings
ii  libguestfs-reiserfs:amd64                  1:1.32.2-4ubuntu2                            amd64        guest disk image management system - ReiserFS support
ii  libguestfs-tools                           1:1.32.2-4ubuntu2                            amd64        guest disk image management system - tools
ii  libguestfs-xfs:amd64                       1:1.32.2-4ubuntu2                            amd64        guest disk image management system - XFS support
ii  libguestfs0:amd64                          1:1.32.2-4ubuntu2                            amd64        guest disk image management system - shared library

$ sudo guestfish -a xenial-server-cloudimg-amd64-disk1.img --network -v << EOF
run
mount /dev/sda1 /
command 'apt update'
EOF
libguestfs: launch: program=guestfish
libguestfs: launch: version=1.32.2
libguestfs: launch: backend registered: unix
libguestfs: launch: backend registered: uml
....
[    3.684953] input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input2
/sbin/dhclient-script: 35: /sbin/dhclient-script: cannot open /etc/fstab: No such file
RTNETLINK answers: File exists
/sbin/dhclient-script: 35: /sbin/dhclient-script: cannot open /etc/fstab: No such file
RTNETLINK answers: File exists
/sbin/dhclient-script: 35: /sbin/dhclient-script: cannot open /etc/fstab: No such file
RTNETLINK answers: File exists
/sbin/dhclient-script: 35: /sbin/dhclient-script: cannot open /etc/fstab: No such file
RTNETLINK answers: File exists
/sbin/dhclient-script: 35: /sbin/dhclient-script: cannot open /etc/fstab: No such file
RTNETLINK answers: File exists
/sbin/dhclient-script: 35: /sbin/dhclient-script: cannot open /etc/fstab: No such file
RTNETLINK answers: File exists
/sbin/dhclient-script: 35: /sbin/dhclient-script: cannot open /etc/fstab: No such file
RTNETLINK answers: File exists
/sbin/dhclient-script: 35: /sbin/dhclient-script: cannot open /etc/fstab: No such file
RTNETLINK answers: File exists

[Regression Potential]

This may impact libguestfs functionality when netwrok flag is enabled.

[Other Info]

Upstream commit  :
https://github.com/libguestfs/libguestfs/commit/fd60be95091a1923e108f72caf251f5549eeccd0

# git
git describe --contains  fd60be9509
v1.33.43~10


# rmadison
 => libguestfs | 1:1.32.2-4ubuntu2    | xenial/universe         | source
 libguestfs | 1:1.36.13-1ubuntu3   | bionic/universe         | source
 libguestfs | 1:1.36.13-1ubuntu3.2 | bionic-updates/universe | source
 libguestfs | 1:1.38.4-1ubuntu2    | cosmic/universe         | source
 libguestfs | 1:1.40.1-1ubuntu1    | disco/universe          | source

** Affects: libguestfs (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: libguestfs (Ubuntu Xenial)
     Importance: Medium
     Assignee: Ioanna Alifieraki (joalif)
         Status: In Progress


** Tags: patch sts
-- 
virt-customize enters infinite loop: dhclient-script: cannot open /etc/fstab
https://bugs.launchpad.net/bugs/1632405
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