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author | Lennart Poettering <lennart@poettering.net> | 2023-03-29 22:07:22 +0200 |
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committer | Lennart Poettering <lennart@poettering.net> | 2023-04-13 06:44:27 +0200 |
commit | b9c1883a9cd9b5126fe648f3e198143dc19a222d (patch) | |
tree | f31bf560425d33c0d6933b20fe724e11942d6206 /src/basic/unit-def.h | |
parent | c25fac9a17b95271bb6f8d967d33c5a9aa9e4bc9 (diff) | |
download | systemd-b9c1883a9cd9b5126fe648f3e198143dc19a222d.tar.gz |
service: add ability to pin fd store
Oftentimes it is useful to allow the per-service fd store to survive
longer than for a restart. This is useful in various scenarios:
1. An fd to some security relevant object needs to be stashed somewhere,
that should not be cleaned automatically, because the security
enforcement would be dropped then.
2. A user namespace fd should be allocated on first invocation and be
kept around until the user logs out (i.e. systemd --user ends), รก la
#16328 (This does not implement what #16318 asks for, but should
solve the use-case discussed there.)
3. There's interest in allow a concept of "userspace reboots" where the
kernel stays running, and userspace is swapped out (i.e. all services
exit, and the rootfs transitioned into a new version of it) while
keeping some select resources pinned, very similar to how we
implement a switch root. Thus it is useful to allow services to exit,
while leaving their fds around till the very end.
This is exposed through a new FileDescriptorStorePreserve= setting that
is closely modelled after RuntimeDirectoryPreserve= (in fact it reused
the same internal type), since we want similar behaviour in the end, and
quite often they probably want to be used together.
Diffstat (limited to 'src/basic/unit-def.h')
-rw-r--r-- | src/basic/unit-def.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/basic/unit-def.h b/src/basic/unit-def.h index 2fab42e9c7..169e1f719e 100644 --- a/src/basic/unit-def.h +++ b/src/basic/unit-def.h @@ -146,6 +146,7 @@ typedef enum ServiceState { SERVICE_FAILED, SERVICE_DEAD_BEFORE_AUTO_RESTART, SERVICE_FAILED_BEFORE_AUTO_RESTART, + SERVICE_DEAD_RESOURCES_PINNED, /* Like SERVICE_DEAD, but with pinned resources */ SERVICE_AUTO_RESTART, SERVICE_CLEANING, _SERVICE_STATE_MAX, |