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add clonehostname hook

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This hook script updates the hostname in various files under /etc in the
cloned container. In order to do so, the old container name is passed in
the LXC_SRC_NAME environment variable.

Signed-off-by: Dwight Engen <dwight.engen@oracle.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
This commit is contained in:
Dwight Engen 2013-07-09 16:19:45 -04:00 committed by Serge Hallyn
parent b9b3a92f66
commit 1143ed392d
4 changed files with 39 additions and 3 deletions
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3
doc/lxc-clone.sgml.in
View File

@ -255,7 +255,8 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
argument 4. The <filename>LXC_ROOTFS_MOUNT</filename> environment variable gives
the path under which the container's root filesystem is mounted. The
configuration file pathname is stored in <filename>LXC_CONFIG_FILE</filename>, the
container name in <filename>LXC_NAME</filename>, and the path or device on which
new container name in <filename>LXC_NAME</filename>, the old container name in
<filename>LXC_SRC_NAME</filename>, and the path or device on which
the rootfs is located is in <filename>LXC_ROOTFS_PATH</filename>.
</para>
</refsect1>

1
hooks/Makefile.am
View File

@ -1,6 +1,7 @@
hooksdir=@LXCHOOKDIR@
hooks_SCRIPTS = \
clonehostname \
mountcgroups \
mountecryptfsroot

29
hooks/clonehostname Executable file
View File

@ -0,0 +1,29 @@
#!/bin/sh
#
# Update the hostname in the cloned container's scripts
#
# Copyright © 2013 Oracle.
#
# This library is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
# Note that /etc/hostname is updated by lxc itself
for file in \
$LXC_ROOTFS_PATH/etc/sysconfig/network \
$LXC_ROOTFS_PATH/etc/sysconfig/network-scripts/ifcfg-* ;
do
if [ -f $file ]; then
sed -i "s|$LXC_SRC_NAME|$LXC_NAME|" $file
fi
done
exit 0

9
src/lxc/lxccontainer.c
View File

@ -1770,7 +1770,9 @@ static int copy_storage(struct lxc_container *c0, struct lxc_container *c,
return 0;
}
static int clone_update_rootfs(struct lxc_container *c, int flags, char **hookargs)
static int clone_update_rootfs(struct lxc_container *c0,
struct lxc_container *c, int flags,
char **hookargs)
{
int ret = -1;
char path[MAXPATHLEN];
@ -1800,6 +1802,9 @@ static int clone_update_rootfs(struct lxc_container *c, int flags, char **hookar
if (!lxc_list_empty(&conf->hooks[LXCHOOK_CLONE])) {
/* Start of environment variable setup for hooks */
if (setenv("LXC_SRC_NAME", c0->name, 1)) {
SYSERROR("failed to set environment variable for source container name");
}
if (setenv("LXC_NAME", c->name, 1)) {
SYSERROR("failed to set environment variable for container name");
}
@ -1958,7 +1963,7 @@ struct lxc_container *lxcapi_clone(struct lxc_container *c, const char *newname,
if (!c2->save_config(c2, NULL))
goto out;
if (clone_update_rootfs(c2, flags, hookargs) < 0)
if (clone_update_rootfs(c, c2, flags, hookargs) < 0)
goto out;
// TODO: update c's lxc.snapshot = count