mirror of
https://github.com/thegeeklab/wp-docker-buildx.git
synced 2024-11-22 10:10:39 +00:00
88 lines
3.0 KiB
Plaintext
88 lines
3.0 KiB
Plaintext
|
#!/bin/bash
|
||
|
|
|
||
|
|
# Ensure that all nodes in /dev/mapper correspond to mapped devices currently loaded by the device-mapper kernel driver
|
||
|
|
dmsetup mknodes
|
||
|
|
|
||
|
|
# First, make sure that cgroups are mounted correctly.
|
||
|
|
CGROUP=/sys/fs/cgroup
|
||
|
|
: {LOG:=stdio}
|
||
|
|
|
||
|
|
[ -d $CGROUP ] ||
|
||
|
|
mkdir $CGROUP
|
||
|
|
|
||
|
|
mountpoint -q $CGROUP ||
|
||
|
|
mount -n -t tmpfs -o uid=0,gid=0,mode=0755 cgroup $CGROUP || {
|
||
|
|
echo "Could not make a tmpfs mount. Did you use --privileged?"
|
||
|
|
exit 1
|
||
|
|
}
|
||
|
|
|
||
|
|
if [ -d /sys/kernel/security ] && ! mountpoint -q /sys/kernel/security
|
||
|
|
then
|
||
|
|
mount -t securityfs none /sys/kernel/security || {
|
||
|
|
echo "Could not mount /sys/kernel/security."
|
||
|
|
echo "AppArmor detection and --privileged mode might break."
|
||
|
|
}
|
||
|
|
fi
|
||
|
|
|
||
|
|
# Mount the cgroup hierarchies exactly as they are in the parent system.
|
||
|
|
for SUBSYS in $(cut -d: -f2 /proc/1/cgroup)
|
||
|
|
do
|
||
|
|
[ -d $CGROUP/$SUBSYS ] || mkdir $CGROUP/$SUBSYS
|
||
|
|
mountpoint -q $CGROUP/$SUBSYS ||
|
||
|
|
mount -n -t cgroup -o $SUBSYS cgroup $CGROUP/$SUBSYS
|
||
|
|
|
||
|
|
# The two following sections address a bug which manifests itself
|
||
|
|
# by a cryptic "lxc-start: no ns_cgroup option specified" when
|
||
|
|
# trying to start containers withina container.
|
||
|
|
# The bug seems to appear when the cgroup hierarchies are not
|
||
|
|
# mounted on the exact same directories in the host, and in the
|
||
|
|
# container.
|
||
|
|
|
||
|
|
# Named, control-less cgroups are mounted with "-o name=foo"
|
||
|
|
# (and appear as such under /proc/<pid>/cgroup) but are usually
|
||
|
|
# mounted on a directory named "foo" (without the "name=" prefix).
|
||
|
|
# Systemd and OpenRC (and possibly others) both create such a
|
||
|
|
# cgroup. To avoid the aforementioned bug, we symlink "foo" to
|
||
|
|
# "name=foo". This shouldn't have any adverse effect.
|
||
|
|
echo $SUBSYS | grep -q ^name= && {
|
||
|
|
NAME=$(echo $SUBSYS | sed s/^name=//)
|
||
|
|
ln -s $SUBSYS $CGROUP/$NAME
|
||
|
|
}
|
||
|
|
|
||
|
|
# Likewise, on at least one system, it has been reported that
|
||
|
|
# systemd would mount the CPU and CPU accounting controllers
|
||
|
|
# (respectively "cpu" and "cpuacct") with "-o cpuacct,cpu"
|
||
|
|
# but on a directory called "cpu,cpuacct" (note the inversion
|
||
|
|
# in the order of the groups). This tries to work around it.
|
||
|
|
[ $SUBSYS = cpuacct,cpu ] && ln -s $SUBSYS $CGROUP/cpu,cpuacct
|
||
|
|
done
|
||
|
|
|
||
|
|
|
||
|
|
# Note: as I write those lines, the LXC userland tools cannot setup
|
||
|
|
# a "sub-container" properly if the "devices" cgroup is not in its
|
||
|
|
# own hierarchy. Let's detect this and issue a warning.
|
||
|
|
grep -q :devices: /proc/1/cgroup ||
|
||
|
|
echo "WARNING: the 'devices' cgroup should be in its own hierarchy."
|
||
|
|
grep -qw devices /proc/1/cgroup ||
|
||
|
|
echo "WARNING: it looks like the 'devices' cgroup is not mounted."
|
||
|
|
|
||
|
|
# Now, close extraneous file descriptors.
|
||
|
|
pushd /proc/self/fd >/dev/null
|
||
|
|
for FD in *
|
||
|
|
do
|
||
|
|
case "$FD" in
|
||
|
|
# Keep stdin/stdout/stderr
|
||
|
|
[012])
|
||
|
|
;;
|
||
|
|
# Nuke everything else
|
||
|
|
*)
|
||
|
|
eval exec "$FD>&-"
|
||
|
|
;;
|
||
|
|
esac
|
||
|
|
done
|
||
|
|
popd >/dev/null
|
||
|
|
|
||
|
|
|
||
|
|
# If a pidfile is still around (for example after a container restart),
|
||
|
|
# delete it so that docker can start.
|
||
|
|
rm -rf /var/run/docker.pid
|