The selling features are:
* Support for RESOLVE_BENEATH, RESOLVE_IN_ROOT and RESOLVE_NO_SYMLINKS
* Fallback from openat2 to open_tree to openat for compatibility
* Triggering of automounts
A lot of recent convenience APIs can easily be backported, but they'll
clutter glnx-backports.h. In preparation, split these out.
Another reason to separate these is that when we start adding backports
of test utilities that need implementation code in the libglnx static
library, we'll want their implementations to be in a separate
translation unit, so that they don't get linked into production
executables, only into tests.
Signed-off-by: Simon McVittie <smcv@collabora.com>
To fill in some gaps, I've had to make some assumptions:
* trivial changes (such as checking for an additional function or
header file in libglnx.m4) are assumed to not be copyrightable
* Will Thompson and Matthew Leeds are assumed to be contributing on
behalf of Endless Mobile Inc.
* files with no explicit licensing information are assumed to be
under the license found in COPYING
Reference: https://reuse.software/
Signed-off-by: Simon McVittie <smcv@debian.org>
Planning to use memfd_create() in flatpak and rpm-ostree, which both use
bubblewrap, and want to pass read-only data via file descriptor to the
container. Passing via `O_TMPFILE` requires `O_RDWR` (read and write),
and passing via a pipe would require buffering.
The systemd `missing.h` has grown enormously; I only cherry-picked the bits for
memfd.
I originally tried to get this into GLib:
https://bugzilla.gnome.org/show_bug.cgi?id=783751
But that looks like it's going to fail due to MSVC. Let's add it here at least
so I can start using it tomorrow and not wait for the MSVC team to catch up.
I renamed `glnx-alloca.h` to `glnx-macros.h` as a more natural collective
home for things from systemd's `macro.h`.
Finally, I used a Coccinelle spatch similar to the one referenced
in the above BZ to patch our uses.
We don't have this really in GLib, unfortunately. We do want
GCancellable, but we also want to operate on raw fds where possible.
The "read a file and validate as UTF-8" is a common use case of mine,
and this combines that with openat().
This module is a new successor to libgsystem. It currently contains a
backport of the GLib cleanup macros, but soon more Linux-specific code
will be added.
