This ensures a signal gets delivered to the process instead of relying on parent death behaviour.
SIGCONT was chosen as it is the only signal an unprivileged process is allowed to send to processes with different credentials.
A custom signal handler is installed because the Go runtime does not expose signal information other than which signal was received, and shim must check pid to ensure reasonable behaviour.
Signed-off-by: Ophestra <cat@gensokyo.uk>
Just returning an error after a successful call of commit will leave garbage behind with no way for the caller to clean them. This change ensures revert is always called after successful commit with at least per-process state enabled.
Signed-off-by: Ophestra <cat@gensokyo.uk>
This is yet another implementation detail from before system.I, getting rid of this vastly cuts down on redundant seal state.
Signed-off-by: Ophestra <cat@gensokyo.uk>
This removes the requirement to call fmsg.Exit on every exit path, and enables direct use of the "log" package. However, fmsg.BeforeExit is still encouraged when possible to catch exit on suspended output.
Signed-off-by: Ophestra <cat@gensokyo.uk>
The primary use case for extra perms is app-specific state directories, which may or may not exist (first run of any app).
Signed-off-by: Ophestra <cat@gensokyo.uk>
This is useful for static /etc directories provided by self-contained application packages, or in cases where autoetc is useful for paths other than /etc.
Signed-off-by: Ophestra <cat@gensokyo.uk>
