manager: add DefaultEnvironment option

This complements existing functionality of setting variables
through 'systemctl set-environment', the kernel command line,
and through normal environment variables for systemd in session
mode.

5 files changed, 25 insertions, 2 deletions

diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
index 4a835b6e8b..15fabe860e 100644
--- a/src/core/load-fragment.c
+++ b/src/core/load-fragment.c
@@ -1564,7 +1564,7 @@ int config_parse_environ(const char *unit,
         assert(filename);
         assert(lvalue);
         assert(rvalue);
-        assert(u);
+        assert(data);
 
         if (isempty(rvalue)) {
                 /* Empty assignment resets the list */
@@ -1573,7 +1573,11 @@ int config_parse_environ(const char *unit,
                 return 0;
         }
 
-        k = unit_full_printf(u, rvalue);
+        if (u)
+                k = unit_full_printf(u, rvalue);
+        else
+                k = strdup(rvalue);
+
         if (!k)
                 return log_oom();
 
diff --git a/src/core/main.c b/src/core/main.c
index 26aa561218..470fecf15d 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -94,6 +94,7 @@ static ExecOutput arg_default_std_output = EXEC_OUTPUT_JOURNAL;
 static ExecOutput arg_default_std_error = EXEC_OUTPUT_INHERIT;
 static usec_t arg_runtime_watchdog = 0;
 static usec_t arg_shutdown_watchdog = 10 * USEC_PER_MINUTE;
+static char **arg_default_environment = NULL;
 static struct rlimit *arg_default_rlimit[RLIMIT_NLIMITS] = {};
 static uint64_t arg_capability_bounding_set_drop = 0;
 static nsec_t arg_timer_slack_nsec = (nsec_t) -1;
@@ -646,6 +647,7 @@ static int parse_config_file(void) {
                 { "Manager", "ShutdownWatchdogSec",   config_parse_sec,          0, &arg_shutdown_watchdog   },
                 { "Manager", "CapabilityBoundingSet", config_parse_bounding_set, 0, &arg_capability_bounding_set_drop },
                 { "Manager", "TimerSlackNSec",        config_parse_nsec,         0, &arg_timer_slack_nsec    },
+                { "Manager", "DefaultEnvironment",    config_parse_environ,      0, &arg_default_environment },
                 { "Manager", "DefaultLimitCPU",       config_parse_limit,        0, &arg_default_rlimit[RLIMIT_CPU]},
                 { "Manager", "DefaultLimitFSIZE",     config_parse_limit,        0, &arg_default_rlimit[RLIMIT_FSIZE]},
                 { "Manager", "DefaultLimitDATA",      config_parse_limit,        0, &arg_default_rlimit[RLIMIT_DATA]},
@@ -1630,6 +1632,9 @@ int main(int argc, char *argv[]) {
         if (arg_default_controllers)
                 manager_set_default_controllers(m, arg_default_controllers);
 
+        if (arg_default_environment)
+                manager_set_default_environment(m, arg_default_environment);
+
         manager_set_show_status(m, arg_show_status);
 
         /* Remember whether we should queue the default job */
diff --git a/src/core/manager.c b/src/core/manager.c
index f16621ac2b..5c3a2c72f3 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -2570,6 +2570,18 @@ void manager_undo_generators(Manager *m) {
         remove_generator_dir(m, &m->generator_unit_path_late);
 }
 
+int manager_set_default_environment(Manager *m, char **environment) {
+
+        char **e = NULL;
+        assert(m);
+        e = strv_env_merge(2, m->environment, environment);
+        if (!e)
+                return -ENOMEM;
+        strv_free(m->environment);
+        m->environment = e;
+        return 0;
+}
+
 int manager_set_default_controllers(Manager *m, char **controllers) {
         char **l;
 
diff --git a/src/core/manager.h b/src/core/manager.h
index e21c8f7abf..f0bb2eb035 100644
--- a/src/core/manager.h
+++ b/src/core/manager.h
@@ -272,6 +272,7 @@ unsigned manager_dispatch_load_queue(Manager *m);
 unsigned manager_dispatch_run_queue(Manager *m);
 unsigned manager_dispatch_dbus_queue(Manager *m);
 
+int manager_set_default_environment(Manager *m, char **environment);
 int manager_set_default_controllers(Manager *m, char **controllers);
 int manager_set_default_rlimits(Manager *m, struct rlimit **default_rlimit);
 
diff --git a/src/core/system.conf b/src/core/system.conf
index 508e0f5fa4..f2817bc507 100644
--- a/src/core/system.conf
+++ b/src/core/system.conf
@@ -25,6 +25,7 @@
 #ShutdownWatchdogSec=10min
 #CapabilityBoundingSet=
 #TimerSlackNSec=
+#DefaultEnvironment=
 #DefaultLimitCPU=
 #DefaultLimitFSIZE=
 #DefaultLimitDATA=