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And while we are at it, let's rearrange and extend the Type=
documentation a bit. Let's make it an itemized list, and let's add a
paragraph explaining which type best to use.
Users are often surprised that "systemd-run" command lines like
"systemd-run -p User=idontexist /bin/true" will return successfully,
even though the logs show that the process couldn't be invoked, as the
user "idontexist" doesn't exist. This is because Type=simple will only
wait until fork() succeeded before returning start-up success.
This patch adds a new service type Type=exec, which is very similar to
Type=simple, but waits until the child process completed the execve()
before returning success. It uses a pipe that has O_CLOEXEC set for this
logic, so that the kernel automatically sends POLLHUP on it when the
execve() succeeded but leaves the pipe open if not. This means PID 1
waits exactly until the execve() succeeded in the child, and not longer
and not shorter, which is the desired functionality.
Making use of this new functionality, the command line
"systemd-run -p User=idontexist -p Type=exec /bin/true" will now fail,
as expected.
When process fd lists to pass to activated programs we always place the
socket activation fds first, and the storage fds last. Irritatingly in
almost all calls the "n_storage_fds" parameter (i.e. the number of
storage fds to pass) came first so far, and the "n_socket_fds" parameter
second. Let's clean this up, and specify the number of fds in the order
the fds themselves are passed.
(Also, let's fix one more case where "unsigned" was used to size an
array, while we should use "size_t" instead.)
machined exposes the pseudo-container ".host" as a reference to the host
system, and this means "machinectl login .host" and "machinectl shell
.host" get your a login/shell on the host. systemd-run currently doesn't
allow that. Let's fix that, and make sd-bus understand ".host" as an
alias for connecting to the host system.
We so far had various placed we'd parse percentages with
parse_percent(). Let's make them use parse_permille() instead, which is
downward compatible (as it also parses percent values), and increases
the granularity a bit. Given that on the wire we usually normalize
relative specifications to something like UINT32_MAX anyway changing
from base-100 to base-1000 calculations can be done easily without
breaking compat.
This commit doesn't document this change in the man pages. While
allowing more precise specifcations permille is not as commonly
understood as perent I guess, hence let's keep this out of the docs for
now.
If 'v' is negative, it's wrong to add the decimal to it, as we'd
actually need to subtract it in this case. But given that we don't want
to allow negative vaues anyway, simply check earlier whether what we
have parsed so far was negative, and react to that before adding the
decimal to it.
1. Document the new desktop= parameter
2. Clarify that we set XDG_SESSION_DESKTOP, XDG_SESSION_CLASS,
XDG_SESSION_TYPE if we have the data, and don't just read it.
We likely get the data from the env block, but we might also determine
it from elsewhere (such as PAM module parameters). Let's set the env
vars on the env block explicitly, so that they are available always, and
apps can rely on it.
Let's make this symmetric with XDG_SESSION_CLASS and XDG_SESSION_TYPE,
so that PAM stacks can configure this easily without involving env vars,
in case there are PAM session managers which only support a single
desktop anyway.
Since D-Bus 1.9.14 (2015-03-02) dbus looks in $XDG_RUNTIME_DIR/bus for
the system bus on its own, hence we can finally drop setting this
environment variable. gdbus since glib 2.45.3 (June 2015) also supports
it.
When networkd has not connected and setting hostname/timezone is
requested, the operation is delayed, not canceled. So, logging in
debug level is sufficient for the corresponding log message.
Closes#9699.
Add CC0 as the license. SPDX does not have a "public domain" tag, but CC0 is
more or less equivalent. We should have *some* header to avoid doubts in the
future.
