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run: expand variables also with --scope

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This makes syntax be the same for commands which are started by the manager and
those which are spawned directly (when --scope is used).

Before:
$ systemd-run -q -t echo '$TERM'
xterm-256color

$ systemd-run -q --scope echo '$TERM'
$TERM

Now:
$ systemd-run -q --scope echo '$TERM'
xterm-256color

Previous behaviour can be restored via --expand-environment=no:
$ systemd-run -q --scope --expand-environment=no echo '$TERM'
$TERM

Fixes #22948.

At some level, this is a compat break. Fortunately --scope is not very widely
used, so I think we can get away with this. Having different syntax depending
on whether --scope was used or not was bad UX.

A NEWS entry will be required.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2023-04-04 21:18:33 +02:00
parent de99fadd31
commit 2ed7a221fa
2 changed files with 15 additions and 8 deletions
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11
man/systemd-run.xml
View file

@ -177,11 +177,12 @@
<varlistentry>
<term><option>--expand-environment=<replaceable>BOOL</replaceable></option></term>
<listitem><para>Expand environment variables in command arguments. If enabled (the default), the
service manager that spawns the actual command will expand variables specified as
<literal>${<replaceable>VARIABLE</replaceable>}</literal> in the same way as in commands specied via
<varname>ExecStart=</varname> in units. Note that this is similar to, but not the same as variable
expansion in
<listitem><para>Expand environment variables in command arguments. If enabled (the default),
environment variables specified as <literal>${<replaceable>VARIABLE</replaceable>}</literal> will be
expanded in the same way as in commands specified via <varname>ExecStart=</varname> in units. With
<varname>--scope</varname>, this expansion is performed by <command>systemd-run</command> itself, and
in other cases by the service manager that spawns the command. Note that this is similar to, but not
the same as variable expansion in
<citerefentry project='man-pages'><refentrytitle>bash</refentrytitle><manvolnum>1</manvolnum></citerefentry>
and other shells.</para>

12
src/run/run.c
View file

@ -103,8 +103,7 @@ static int help(void) {
" --description=TEXT Description for unit\n"
" --slice=SLICE Run in the specified slice\n"
" --slice-inherit Inherit the slice\n"
" --expand-environment=BOOL Control server-side expansion of environment\n"
" variables\n"
" --expand-environment=BOOL Control expansion of environment variables\n"
" --no-block Do not wait until operation finished\n"
" -r --remain-after-exit Leave service around until explicitly stopped\n"
" --wait Wait until service stopped again\n"
@ -1472,7 +1471,7 @@ static int start_transient_scope(sd_bus *bus) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL;
_cleanup_(bus_wait_for_jobs_freep) BusWaitForJobs *w = NULL;
_cleanup_strv_free_ char **env = NULL, **user_env = NULL;
_cleanup_strv_free_ char **env = NULL, **user_env = NULL, **expanded_cmdline = NULL;
_cleanup_free_ char *scope = NULL;
const char *object = NULL;
sd_id128_t invocation_id;
@ -1614,6 +1613,13 @@ static int start_transient_scope(sd_bus *bus) {
if (!arg_quiet)
log_info("Running scope as unit: %s", scope);
if (arg_expand_environment) {
expanded_cmdline = replace_env_argv(arg_cmdline, env);
if (!expanded_cmdline)
return log_oom();
arg_cmdline = expanded_cmdline;
}
execvpe(arg_cmdline[0], arg_cmdline, env);
return log_error_errno(errno, "Failed to execute: %m");