Hi,
While playing with lxc-start, I noticed that /tmp is infested by empty
lxc-r* directories:
# lxc-start --logfile=/tmp/startlog --logpriority=DEBUG -n jail -s
lxc.mount.entry="/ /tmp/jail none bind 0 0" -s lxc.rootfs=/tmp/jail -s
lxc.pivotdir=/mnt ls /proc
# cat /tmp/startlog
lxc-start 1273064291.740 DEBUG lxc_start - sigchild handler set
lxc-start 1273064291.740 INFO lxc_start - 'jail' is initialized
lxc-start 1273064291.745 DEBUG lxc_cgroup - using cgroup mounted at
'/cgroup'
lxc-start 1273064291.745 DEBUG lxc_cgroup - '/cgroup/3178' renamed to
'/cgroup/jail'
lxc-start 1273064291.746 DEBUG lxc_conf - mounted / on /tmp/jail, type
none
lxc-start 1273064291.746 INFO lxc_conf - mount points have been setup
lxc-start 1273064291.746 WARN lxc_conf - rootfs specified but no
console found
lxc-start 1273064291.746 INFO lxc_conf - 0 tty(s) has been setup
lxc-start 1273064291.746 DEBUG lxc_conf - temporary mountpoint for old
rootfs is './mnt'
lxc-start 1273064291.746 DEBUG lxc_conf - pivot_root syscall to '/mnt'
successful
lxc-start 1273064291.746 DEBUG lxc_conf - umounted '/mnt/dev/pts'
lxc-start 1273064291.746 DEBUG lxc_conf - umounted '/mnt/dev/shm'
lxc-start 1273064291.746 DEBUG lxc_conf - umounted '/mnt/sys'
lxc-start 1273064291.746 DEBUG lxc_conf - umounted '/mnt/proc'
lxc-start 1273064291.747 DEBUG lxc_conf - umounted '/mnt/lib/init/rw'
lxc-start 1273064291.747 DEBUG lxc_conf - umounted '/mnt/var/run'
lxc-start 1273064291.747 DEBUG lxc_conf - umounted '/mnt/var/lock'
lxc-start 1273064291.747 DEBUG lxc_conf - umounted '/mnt/cgroup'
lxc-start 1273064291.747 DEBUG lxc_conf - umounted '/mnt/tmp/jail'
lxc-start 1273064291.747 DEBUG lxc_conf - umounted '/mnt/dev'
lxc-start 1273064291.747 DEBUG lxc_conf - umounted '/mnt/tmp'
lxc-start 1273064291.747 DEBUG lxc_conf - umounted '/mnt'
lxc-start 1273064291.747 INFO lxc_conf - pivoted to '/tmp/lxc-rX4K9le'
lxc-start 1273064291.748 DEBUG lxc_conf - capabilities has been setup
lxc-start 1273064291.748 NOTICE lxc_conf - 'jail' is setup.
lxc-start 1273064291.748 NOTICE lxc_start - exec'ing 'ls'
lxc-start 1273064291.753 NOTICE lxc_start - 'ls' started with pid '3178'
lxc-start 1273064291.753 INFO lxc_console - no console specified
lxc-start 1273064291.753 WARN lxc_utmp - '/tmp/jail/var/run/utmp' not
found
lxc-start 1273064291.763 DEBUG lxc_start - child exited
lxc-start 1273064291.763 DEBUG lxc_cgroup - using cgroup mounted at
'/cgroup'
lxc-start 1273064291.764 DEBUG lxc_cgroup - '/cgroup/jail' unlinked
And /tmp/lxc-rX4K9le is left behind... Ok, this name comes from
lxc-rootfs in conf.c:setup_rootfs. After setup_rootfs_pivot_root
returns, the original /tmp is not available anymore, so rmdir(tmpname)
at the bottom of setup_rootfs can't achieve much. Why is this temporary
name needed anyway? Is pivoting impossible without it? I can't see why.
--
Thanks,
Feri.
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