[Bug 1824236] Re: supermin/liguestfs fails to configure network
Eric Desrochers
eric.desrochers at canonical.com
Fri May 31 11:46:25 UTC 2019
** Description changed:
[Impact]
libguestfs cannot configure network on Bionic onward.
This bug is a combination of libguestfs/supermin package and
/etc/dhcp/dhclient-enter-hooks.d/resolved script from systemd,
present on Bionic onward.
When supermin creates the appliance does chroot and executes its init script.
If networking is enabled init will call dhclient sript to configure the network.
On Bionic onward the make_resolv_conf function of dhclient_script is overwritten
in /etc/dhcp/dhclient-eneter-hooks.d/resolved which before exiting restarts
the systemd.resolved service.
However, this happening in chroot environment fails with
"System has not been booted with systemd as init system (PID 1). Can't operate."
and network is left unconfigured.
[Test Case]
$ 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=1.36.13
libguestfs: launch: backend registered: unix
libguestfs: launch: backend registered: uml
libguestfs: launch: backend registered: libvirt
...
supermin: deleting initramfs files
supermin: chroot
Starting /init script ...
...
+ dhclient --version
+ dhclient eth0
System has not been booted with systemd as init system (PID 1). Can't operate.
...
commandrvf: apt update
WARNING: apt does not have a stable CLI interface. Use with caution in
scripts.
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-backports/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/InRelease Temporary failure resolving 'security.ubuntu.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.
...
[Regression Potential]
Minimal. The fix removes the /etc/dhcp/dhclient-eneter-hooks.d/resolved hook installed by systemd.
systemd is not used inside the appliance so it should not cause any regression.
+ https://bugs.launchpad.net/ubuntu/cosmic/+source/libguestfs/+bug/1824236/comments/18
+ https://bugs.launchpad.net/ubuntu/cosmic/+source/libguestfs/+bug/1824236/comments/19
[Other]
Affects B,C,D,E.
Upstream fix :
https://github.com/libguestfs/libguestfs/commit/2bb6be333e6347d3f18856627d8ad8e50b8e5427
-
Workaround
1) Assume that libguestfs is installed, if not :
$ sudo apt-get install libguestfs-tools
2) Move the base.tar.gz to a temp dir, extract and remove tarball
$ sudo mv /usr/lib/x86_64-linux-gnu/guestfs/supermin.d/base.tar.gz ~/tempdir/
$ cd ~/tempdir
$ sudo tar -xzvf base.tar.gz
$ sudo rm base.tar.gz
3) Remove the etc/dhcp/dhclient-enter-hooks.d/resolved file
$ sudo rm etc/dhcp/dhclient-enter-hooks.d/resolved
4) Create tarball again
$ sudo tar -czvf base.tar.gz etc
5) Move it back to installation dir
$ sudo mv base.tar.gz /usr/lib/x86_64-linux-gnu/guestfs/supermin.d/
6) Clean cache
$ sudo rm -rf /var/tmp/.guestfs*
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https://bugs.launchpad.net/bugs/1824236
Title:
supermin/liguestfs fails to configure network
Status in libguestfs package in Ubuntu:
In Progress
Status in supermin package in Ubuntu:
Invalid
Status in libguestfs source package in Bionic:
In Progress
Status in supermin source package in Bionic:
Invalid
Status in libguestfs source package in Cosmic:
In Progress
Status in supermin source package in Cosmic:
Invalid
Status in libguestfs source package in Disco:
In Progress
Status in supermin source package in Disco:
Invalid
Bug description:
[Impact]
libguestfs cannot configure network on Bionic onward.
This bug is a combination of libguestfs/supermin package and
/etc/dhcp/dhclient-enter-hooks.d/resolved script from systemd,
present on Bionic onward.
When supermin creates the appliance does chroot and executes its init script.
If networking is enabled init will call dhclient sript to configure the network.
On Bionic onward the make_resolv_conf function of dhclient_script is overwritten
in /etc/dhcp/dhclient-eneter-hooks.d/resolved which before exiting restarts
the systemd.resolved service.
However, this happening in chroot environment fails with
"System has not been booted with systemd as init system (PID 1). Can't operate."
and network is left unconfigured.
[Test Case]
$ 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=1.36.13
libguestfs: launch: backend registered: unix
libguestfs: launch: backend registered: uml
libguestfs: launch: backend registered: libvirt
...
supermin: deleting initramfs files
supermin: chroot
Starting /init script ...
...
+ dhclient --version
+ dhclient eth0
System has not been booted with systemd as init system (PID 1). Can't operate.
...
commandrvf: apt update
WARNING: apt does not have a stable CLI interface. Use with caution in
scripts.
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-backports/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/InRelease Temporary failure resolving 'security.ubuntu.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.
...
[Regression Potential]
Minimal. The fix removes the /etc/dhcp/dhclient-eneter-hooks.d/resolved hook installed by systemd.
systemd is not used inside the appliance so it should not cause any regression.
https://bugs.launchpad.net/ubuntu/cosmic/+source/libguestfs/+bug/1824236/comments/18
https://bugs.launchpad.net/ubuntu/cosmic/+source/libguestfs/+bug/1824236/comments/19
[Other]
Affects B,C,D,E.
Upstream fix :
https://github.com/libguestfs/libguestfs/commit/2bb6be333e6347d3f18856627d8ad8e50b8e5427
Workaround
1) Assume that libguestfs is installed, if not :
$ sudo apt-get install libguestfs-tools
2) Move the base.tar.gz to a temp dir, extract and remove tarball
$ sudo mv /usr/lib/x86_64-linux-gnu/guestfs/supermin.d/base.tar.gz ~/tempdir/
$ cd ~/tempdir
$ sudo tar -xzvf base.tar.gz
$ sudo rm base.tar.gz
3) Remove the etc/dhcp/dhclient-enter-hooks.d/resolved file
$ sudo rm etc/dhcp/dhclient-enter-hooks.d/resolved
4) Create tarball again
$ sudo tar -czvf base.tar.gz etc
5) Move it back to installation dir
$ sudo mv base.tar.gz /usr/lib/x86_64-linux-gnu/guestfs/supermin.d/
6) Clean cache
$ sudo rm -rf /var/tmp/.guestfs*
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