This commit hooks into the cgroup infrastructure added in the previous
commit to create per-application cgroups.
It does this by adding each "prototype process" into its own cgroup,
then each child process inherits its parents cgroup.
If we fail to create a cgroup we simply fail the process. This behaviour
may get enhanced in the future.
This won't actually do anything yet. Subsequent commits will hook this
up to the build and config systems.
Reviewed-by: Alejandro Colomar <alx@nginx.com>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>
Some non-Linux systems implement pivot_root(2), even if they
don't document that. An example is MacOS:
$ grepc pivot_root / 2>/dev/null
.../sys/sysproto.h:3012:
int pivot_root(struct proc *, struct pivot_root_args *, int *);
Since the prototype of the syscall differs from that of Linux, we
can't use that syscall. Let's make sure the test only detects
pivot_root(2) under Linux. Also, rename the feature macro to make
clear that it's only about Linux's pivot_root(2).
This closes#737 issue on GitHub.
With NXT_HAVE_PIVOT_ROOT, we had issues in MacOS. Headers should
normally be included unconditionally, except of course if they
don't exist.
This fixes part of the #737 issue on GitHub.
The code had a wrong assumption that "mount namespaces" automatically
unmounts process mounts when exits but this happens only with
unprivileged mounts.
When mount points reside within other mount points, this
patch sorts them by path length and then unmounts then
in an order reverse to their mounting. This results in
independent paths being unmounted first.
This fixes an issue in buildbots where dependent paths failed
to unmount, leading to the build script removing system-wide
language libraries.
Now it's possible to disable default bind mounts of
languages by setting:
{
"isolation": {
"automount": {
"language_deps": false
}
}
}
In this case, the user is responsible to provide a "rootfs"
containing the language libraries and required files for
the application.
