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manager: read ~/.config/systemd/user.conf in user mode

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This changes the paths we read user manager config from in two ways:

- split-usr-root paths are dropped. The user manager is a poster boy for
  non-early-boot, so reading dropins only from /usr is appropriate.

- we look at ~/.config/systemd/user.conf. Users should be allowed to override
  their own config.

As user managers become more and more used, it becomes more important for users
to customize their own daemon. By reading from ~/.config, this is possible
without privileges.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2021-02-19 10:56:04 +01:00
parent 8b8024f1c2
commit f70e6fb471
2 changed files with 62 additions and 22 deletions
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24
man/systemd-system.conf.xml
View File

@ -31,7 +31,9 @@
<filename>/etc/systemd/system.conf.d/*.conf</filename>,
<filename>/run/systemd/system.conf.d/*.conf</filename>,
<filename>/usr/lib/systemd/system.conf.d/*.conf</filename></para>
<para><filename>/etc/systemd/user.conf</filename>,
<para><filename>~/.config/systemd/user.conf</filename>,
<filename>/etc/systemd/user.conf</filename>,
<filename>/etc/systemd/user.conf.d/*.conf</filename>,
<filename>/run/systemd/user.conf.d/*.conf</filename>,
<filename>/usr/lib/systemd/user.conf.d/*.conf</filename></para>
@ -40,16 +42,16 @@
<refsect1>
<title>Description</title>
<para>When run as a system instance, systemd interprets the
configuration file <filename>system.conf</filename> and the files
in <filename>system.conf.d</filename> directories; when run as a
user instance, systemd interprets the configuration file
<filename>user.conf</filename> and the files in
<filename>user.conf.d</filename> directories. These configuration
files contain a few settings controlling basic manager
operations. See
<citerefentry><refentrytitle>systemd.syntax</refentrytitle><manvolnum>7</manvolnum></citerefentry>
for a general description of the syntax.</para>
<para>When run as a system instance, <command>systemd</command> interprets the configuration file
<filename>system.conf</filename> and the files in <filename>system.conf.d</filename> directories; when
run as a user instance, it interprets the configuration file <filename>user.conf</filename> (either in
the home directory of the user, or if not found, under <filename>/etc/systemd/</filename>) and the files
in <filename>user.conf.d</filename> directories. These configuration files contain a few settings
controlling basic manager operations.</para>
<para>See
<citerefentry><refentrytitle>systemd.syntax</refentrytitle><manvolnum>7</manvolnum></citerefentry> for a
general description of the syntax.</para>
</refsect1>
<xi:include href="standard-conf.xml" xpointer="main-conf" />

60
src/core/main.c
View File

@ -163,6 +163,36 @@ static char **saved_env = NULL;
static int parse_configuration(const struct rlimit *saved_rlimit_nofile,
const struct rlimit *saved_rlimit_memlock);
static int manager_find_user_config_paths(char ***ret_files, char ***ret_dirs) {
_cleanup_free_ char *base = NULL;
_cleanup_strv_free_ char **files = NULL, **dirs = NULL;
int r;
r = xdg_user_config_dir(&base, "/systemd");
if (r < 0)
return r;
r = strv_extendf(&files, "%s/user.conf", base);
if (r < 0)
return r;
r = strv_extend(&files, PKGSYSCONFDIR "/user.conf");
if (r < 0)
return r;
r = strv_consume(&dirs, TAKE_PTR(base));
if (r < 0)
return r;
r = strv_extend_strv(&dirs, CONF_PATHS_STRV("systemd"), false);
if (r < 0)
return r;
*ret_files = TAKE_PTR(files);
*ret_dirs = TAKE_PTR(dirs);
return 0;
}
_noreturn_ static void freeze_or_exit_or_reboot(void) {
/* If we are running in a container, let's prefer exiting, after all we can propagate an exit code to
@ -668,26 +698,34 @@ static int parse_config_file(void) {
{}
};
const char *fn, *conf_dirs_nulstr;
_cleanup_strv_free_ char **_free_files = NULL, **_free_dirs = NULL;
fn = arg_system ?
PKGSYSCONFDIR "/system.conf" :
PKGSYSCONFDIR "/user.conf";
const char *const *files, *const *dirs, *suffix;
int r;
conf_dirs_nulstr = arg_system ?
CONF_PATHS_NULSTR("systemd/system.conf.d") :
CONF_PATHS_NULSTR("systemd/user.conf.d");
if (arg_system) {
files = STRV_MAKE_CONST(PKGSYSCONFDIR "/system.conf");
dirs = (const char* const*) CONF_PATHS_STRV("systemd");
suffix = "system.conf.d";
} else {
r = manager_find_user_config_paths(&_free_files, &_free_dirs);
if (r < 0)
return log_error_errno(r, "Failed to determine config file paths: %m");
files = (const char* const*) _free_files;
dirs = (const char* const*) _free_dirs;
suffix = "user.conf.d";
}
(void) config_parse_many_nulstr(
fn, conf_dirs_nulstr,
(void) config_parse_many(
files, dirs, suffix,
"Manager\0",
config_item_table_lookup, items,
CONFIG_PARSE_WARN,
NULL,
NULL);
/* Traditionally "0" was used to turn off the default unit timeouts. Fix this up so that we used USEC_INFINITY
* like everywhere else. */
/* Traditionally "0" was used to turn off the default unit timeouts. Fix this up so that we use
* USEC_INFINITY like everywhere else. */
if (arg_default_timeout_start_usec <= 0)
arg_default_timeout_start_usec = USEC_INFINITY;
if (arg_default_timeout_stop_usec <= 0)