| Commit message (Collapse) | Author | Age |
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hierarchy
Currently the hybrid mode mounts cgroup v2 on /sys/fs/cgroup instead of the v1
name=elogind hierarchy. While this works fine for elogind itself, it breaks
tools which expect cgroup v1 hierarchy on /sys/fs/cgroup/elogind.
This patch updates the hybrid mode so that it mounts v2 hierarchy on
/sys/fs/cgroup/unified and keeps v1 "name=elogind" hierarchy on
/sys/fs/cgroup/elogind for compatibility. elogind itself doesn't depend on the
"name=elogind" hierarchy at all. All operations take place on the v2 hierarchy
as before but the v1 hierarchy is kept in sync so that any tools which expect
it to be there can keep doing so. This allows elogind to take advantage of
cgroup v2 process management without requiring other tools to be aware of the
hybrid mode.
The hybrid mode is implemented by mapping the special elogind controller to
/sys/fs/cgroup/unified and making the basic cgroup utility operations -
cg_attach(), cg_create(), cg_rmdir() and cg_trim() - also operate on the
/sys/fs/cgroup/elogind hierarchy whenever the cgroup2 hierarchy is updated.
While a bit messy, this will allow dropping complications from using cgroup v1
for process management a lot sooner than otherwise possible which should make
it a net gain in terms of maintainability.
v2: Fixed !cgns breakage reported by @evverx and renamed the unified mount
point to /sys/fs/cgroup/unified as suggested by @brauner.
v3: chown the compat hierarchy too on delegation. Suggested by @evverx.
v4: [zj]
- drop the change to default, full "legacy" is still the default.
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This option can be used, if elogind is built while a different cgroup
controller than planned is active.
A valid scenario could be a gentoo user switching from systemd to
openrc+elogind.
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Support for kdbus can no longer be enabled or disabled. It is simply
there and will be used if needed and possible.
So if you have kdbus available, elogind might use it.
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This is done for systems, which init systems are no cgroup
controllers. One example is runit on Void Linux.
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* Check whether printf.h is available and define/undef HAVE_PRINTF_H
accordingly.
* Added src/shared/parse-printf-format.[hc] by Emil Renner Berthing
<systemd@esmil.dk> that provides parse_printf_format() if printf.h
is unavailable
* Added src/basic/musl_missing.h by Juergen Buchmueller
<pullmoll@t-online.de> that implements glibc functions missing in
musl libc as macros.
* Extended src/basic/musl_missing.h and added
src/basic/musl_missing.c providing
- program_invocation_name
- program_invocation_short_name and
- elogind_set_program_name() to set the two where appropriate.
* Added calls to elogind_set_program_name() to all main() functions
where needed.
* A few other fixes to work nicely with musl libc.
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a) Add some debugging messages to track what's going on with eloginds
cgroup handling.
b) Do not create a cgroup path "/elogind" if our cgroup root is
already "/elogind".
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elogind has to run on any system, no matter which init system is in
control of the cgroups. So instead of hardcoding "name=foo",
configure now greps 1: in /proc/self/cgroup - which is hopefully
the right choice. (Well, to be honest, if it isn't, something is
really wrong with the running system...)
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The only function still using librt was
src/shared/clean-ipc.c::clean_posix_mq().
But that function is not really needed, because elogind does not call
mq_open() anywhere, or any other mqueue related functions.
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Remove logind check, it is always built as elogind anyway.
Remove ENABLE_LOGIND conditional from man pages.
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build-sys: add check for gperf lookup function signature (#5055)
gperf-3.1 generates lookup functions that take a size_t length
parameter instead of unsigned int. Test for this at configure time.
Fixes: https://github.com/systemd/systemd/issues/5039
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