When the amount of free memory on the system is somewhat low, gnome-shell
will sometimes fail to launch apps, reporting the error:
fork(): Cannot allocate memory
fork() is failing here because while cloning the process virtual address
space, Linux worries that the thread being forked may end up COWing the
entire address space of the parent process (gnome-shell, which is
memory-hungry), and there is not enough free memory to permit that to
happen. This check is somewhat irrelevant because we are only forking
to immediately exec(), which will discard the whole virtual address
space anyway.
This issue can be avoided by using a new optimized gspawn codepath in
the latest glib development version, which uses posix_spawn() internally.
For the optimized codepath to be used, we must not pass a child_setup
function, so the the file descriptor management is reimplemented here
using new glib API to pass fds to the child process. The old API will
continue to be used on older glib versions.
We must also change the spawn flags for this code path to be hit.
I checked that gnome-shell's open file descriptors are all CLOEXEC
so using G_SPAWN_LEAVE_DESCRIPTORS_OPEN should be safe.
This will result in more resilient app launching when memory is low,
since the optimized spawn path avoids cloning the virtual address
space of the parent process (gnome-shell) and avoids the irrelevant
memory overcommit check.
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/132
Some systems define it to /usr/lib64 on 64-bit systems, which is not
where systemd looks for unit files. Just hardcode 'lib' in the install
prefix until we get to use the pkg-config file.
https://gitlab.gnome.org/GNOME/gnome-shell/issues/424
So that we can be started by systemd --user, instead of gnome-session.
There are three units:
- gnome-shell.service: Start gnome-shell itself.
- gnome-shell-x11.target, gnome-shell-wayland.target: Sync points for
units that need to care if x11 or wayland is in use.
gnome-settings-daemon will use these, for example.
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/138
Remove any usage of MetaScreen, as it has been removed from libmutter
in the API version 3. The corresponding functionality has been moved
into three different places: MetaDisplay, MetaX11Display (for X11
specific functionality) and MetaWorkspaceManager.
https://bugzilla.gnome.org/show_bug.cgi?id=759538
Package managers usually take care of compiling GSettings schemas and
updating the .desktop database on installation, but when building
manually from source, we should perform the aforementioned actions
ourselves.
https://gitlab.gnome.org/GNOME/gnome-shell/issues/127
find_program() defaults to require the program in question, and as
failing to locate it is now fatal, there's no longer a need for
checking whether it was found later.
Spotted by Michael Catanzaro.
The previous implementation of the CSS generation logic considered sassc
an optional dependency and made sure for that reason that the result CSS
files ended up in the source directory, so that they could be checked
in and kept in sync with the source sass files.
As we are making sassc a required dependency, we can now stop doing that
extra work and simply rely on the CSS files being automatically generated
each time the sass sources change. By doing this, we can now effectively
get rid of the CSS files checked in the repo as well as of the parse_sass.sh
script, since the CSS files will now live on the build directory only.
https://bugzilla.gnome.org/show_bug.cgi?id=792822
IBus was initially made optional as gnome-shell depended on too
recent API. This API is now old enough and gnome-shell is committing
further to IBus by implementing a ClutterInputMethod through it.
Let's just make IBus a mandatory dependency, instead of making code
paths trickier to cater for situations where it's missing.
gvc has made some recent changes that rename its user options
following meson guidelines for GNOME packages[0].
The options used in gvc as a subproject have been renamed
accordingly.
[0] https://wiki.gnome.org/Initiatives/GnomeGoals/MesonPorting
It turns out that NetworkManager does export the directory as pkg-config
variable after all, so use that instead of building the path ourselves
from the prefix.
https://bugzilla.gnome.org/show_bug.cgi?id=789811
Auto-detect options add some convenience for platforms where a
particular feature isn't available - systemd on non-Linux OS comes
to mind - but the downside is that it is easy to accidentally build
without a desired feature. We consider the latter much more serious
nowadays, so turn our auto-detect options into regular boolean
options.
https://bugzilla.gnome.org/show_bug.cgi?id=791007
Meson options are typed, so the prefix isn't necessary, and indeed
looks odd when used to disable the option:
-Denable_foo=false
Also replace underscores with dashes, which is the preferred meson
style.
https://bugzilla.gnome.org/show_bug.cgi?id=791007
Meson is on track to replace autotools as the build system of choice,
so support it in addition to autotools. If all goes well, we'll
eventually be able to drop the latter ...
https://bugzilla.gnome.org/show_bug.cgi?id=783229
