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doc: document the two new env vars set by the service manager

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Lennart Poettering 2018-07-04 15:36:06 +02:00
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doc/ENVIRONMENT.md
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@ -101,3 +101,21 @@ systemd-timedated:
NTP client services. If set, `timedatectl set-ntp on` enables and starts the
first existing unit listed in the environment variable, and
`timedatectl set-ntp off` disables and stops all listed units.
systemd itself:
* `$SYSTEMD_ACTIVATION_UNIT` — set for all NSS and PAM module invocations that
are done by the service manager on behalf of a specific unit, in child
processes that are later (after execve()) going to become unit
processes. Contains the full unit name (e.g. "foobar.service"). NSS and PAM
modules can use this information to determine in which context and on whose
behalf they are being called, which may be useful to avoid deadlocks, for
example to bypass IPC calls to the very service that is about to be
started. Note that NSS and PAM modules should be careful to only rely on this
data when invoked privileged, or possibly only when getppid() returns 1, as
setting environment variables is of course possible in any even unprivileged
contexts.
* `$SYSTEMD_ACTIVATION_SCOPE` — closely related to `$SYSTEMD_ACTIVATION_UNIT`,
it is either set to `system` or `user` depending on whether the NSS/PAM
module is called by systemd in `--system` or `--user` mode.