Hi,
I want to file an RFE but I thought I should discuss a little before
I do: I would like a way to run a script in the global zone when a
non-global zone boots. My use case is:
I'm a developer for NexentaCP and I would like to make an autobuilder
using zones. In particular I want to have a zone that will always come
back in the same state on reboot so that I have minimal packages
installed and everything gets pulled as defined by source package
dependencies. The process might look like:
(global zone)
zone_hook(pre-boot, ...)
-> a script/action occurs for the zone
zone_boot(...)
(non-global zone)
init (the autobuilder will have a svc that builds packages and reports
status to a server)
reboot (perhaps with specific args that the hook script can grab)
(global zone)
zone_halt(...)
zone_hook(post-halt, ...)
I think it would make sense to configure the hooks via a zonecfg section:
---
add hook
set type=[pre-boot | post-boot | pre-halt | post-halt]
set action=script
set path=/path/to/zone_hook.sh
end
---
In my particular use-case I would have a pre-boot hook that rolled the
zone filesystem to a particular snapshot. This way the zone would always
come back in the same state:
---
add hook
set type=pre-boot
set action=script
set path=/path/to/zone_scripts/pre-boot.sh
end
---
For a decent interface we would need to pass information to the scripts
about the zone name, boot args, previous state, ... which might be done
through the environment? An example script might hackishly look like:
---
#!/bin/sh
# Check for fs reset condition
echo "$ZONE_BOOT_ARGS" | grep -w 'reset_zone_fs=yes' > /dev/null
if [ $? != 0 ]; then
exit 0
fi
# get fs to reset
path=`zonecfg -z $ZONE_NAME info zonepath | cut -d: -f2`
zfs_dataset=`zfs list -H -t filesystem -o mountpoint,name | grep
^"$path" | awk '{print $2}'`
# If no fs then exit with an error status
if [ X$zfs_dataset = X ]; then
echo Danger Will Robinson... Danger:
exit -1
fi
# make sure the snapshot exists and rollback
zfs list -H -o name -t snapshot -r $zfs_dataset | grep @snapshot_name$ >
/dev/null
if [ $? != 0 ]; then
echo Error: required snapshot does not exist
exit -1
fi
zfs rollback [EMAIL PROTECTED]
exit 0
---
Comments/criticisms/flying chunkules appreciated.
-Tim
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