firstboot: get rid of firstboot generator again, introduce ConditionFirstBoot= instead

As Zbigniew pointed out a new ConditionFirstBoot= appears like the nicer
way to hook in systemd-firstboot.service on first boots (those with /etc
unpopulated), so let's do this, and get rid of the generator again.

src/core/condition.c

@@ -120,6 +120,20 @@ static bool condition_test_needs_update(Condition *c) {
                 (usr.st_mtim.tv_sec == other.st_mtim.tv_sec && usr.st_mtim.tv_nsec > other.st_mtim.tv_nsec)) == !c->negate;
 }
 
+static bool condition_test_first_boot(Condition *c) {
+        int r;
+
+        assert(c);
+        assert(c->parameter);
+        assert(c->type == CONDITION_FIRST_BOOT);
+
+        r = parse_boolean(c->parameter);
+        if (r < 0)
+                return c->negate;
+
+        return ((access("/run/systemd/first-boot", F_OK) >= 0) == !!r) == !c->negate;
+}
+
 static bool condition_test(Condition *c) {
         assert(c);
 
@@ -202,6 +216,9 @@ static bool condition_test(Condition *c) {
         case CONDITION_NEEDS_UPDATE:
                 return condition_test_needs_update(c);
 
+        case CONDITION_FIRST_BOOT:
+                return condition_test_first_boot(c);
+
         case CONDITION_NULL:
                 return !c->negate;
 

src/core/load-fragment-gperf.gperf.m4

@@ -162,6 +162,7 @@ Unit.ConditionDirectoryNotEmpty, config_parse_unit_condition_path,   CONDITION_D
 Unit.ConditionFileNotEmpty,      config_parse_unit_condition_path,   CONDITION_FILE_NOT_EMPTY,      0
 Unit.ConditionFileIsExecutable,  config_parse_unit_condition_path,   CONDITION_FILE_IS_EXECUTABLE,  0
 Unit.ConditionNeedsUpdate,       config_parse_unit_condition_path,   CONDITION_NEEDS_UPDATE,        0
+Unit.ConditionFirstBoot,         config_parse_unit_condition_path,   CONDITION_FIRST_BOOT,          0
 Unit.ConditionKernelCommandLine, config_parse_unit_condition_string, CONDITION_KERNEL_COMMAND_LINE, 0
 Unit.ConditionArchitecture,      config_parse_unit_condition_string, CONDITION_ARCHITECTURE,        0
 Unit.ConditionVirtualization,    config_parse_unit_condition_string, CONDITION_VIRTUALIZATION,      0

src/core/main.c

@@ -1648,11 +1648,11 @@ int main(int argc, char *argv[]) {
         m->initrd_timestamp = initrd_timestamp;
         m->security_start_timestamp = security_start_timestamp;
         m->security_finish_timestamp = security_finish_timestamp;
-        m->is_first_boot = empty_etc;
 
         manager_set_default_rlimits(m, arg_default_rlimit);
         manager_environment_add(m, NULL, arg_default_environment);
         manager_set_show_status(m, arg_show_status);
+        manager_set_first_boot(m, empty_etc);
 
         /* Remember whether we should queue the default job */
         queue_default_job = !arg_serialization || arg_switched_root;

src/core/manager.c

@@ -2477,7 +2477,7 @@ void manager_check_finished(Manager *m) {
         m->confirm_spawn = false;
 
         /* This is no longer the first boot */
-        m->is_first_boot = false;
+        manager_set_first_boot(m, false);
 
         if (dual_timestamp_is_set(&m->finish_timestamp))
                 return;
@@ -2631,7 +2631,6 @@ void manager_run_generators(Manager *m) {
         _cleanup_closedir_ DIR *d = NULL;
         const char *generator_path;
         const char *argv[5];
-        const char *env[2];
         int r;
 
         assert(m);
@@ -2665,14 +2664,8 @@ void manager_run_generators(Manager *m) {
         argv[3] = m->generator_unit_path_late;
         argv[4] = NULL;
 
-        if (m->is_first_boot) {
-                env[0] = (char*) "SYSTEMD_FIRST_BOOT=1";
-                env[1] = NULL;
-        } else
-                env[0] = NULL;
-
         RUN_WITH_UMASK(0022)
-                execute_directory(generator_path, d, DEFAULT_TIMEOUT_USEC, (char**) argv, (char**) env);
+                execute_directory(generator_path, d, DEFAULT_TIMEOUT_USEC, (char**) argv);
 
 finish:
         trim_generator_dir(m, &m->generator_unit_path);
@@ -2816,6 +2809,20 @@ static bool manager_get_show_status(Manager *m) {
         return plymouth_running();
 }
 
+void manager_set_first_boot(Manager *m, bool b) {
+        assert(m);
+
+        if (m->running_as != SYSTEMD_SYSTEM)
+                return;
+
+        m->first_boot = b;
+
+        if (m->first_boot)
+                touch("/run/systemd/first-boot");
+        else
+                unlink("/run/systemd/first-boot");
+}
+
 void manager_status_printf(Manager *m, bool ephemeral, const char *status, const char *format, ...) {
         va_list ap;
 

src/core/manager.h

@@ -228,6 +228,7 @@ struct Manager {
         bool dispatching_dbus_queue:1;
 
         bool taint_usr:1;
+        bool first_boot:1;
 
         ShowStatus show_status;
         bool confirm_spawn;
@@ -243,7 +244,6 @@ struct Manager {
         bool default_cpu_accounting;
         bool default_memory_accounting;
         bool default_blockio_accounting;
-        bool is_first_boot;
 
         usec_t default_timer_accuracy_usec;
 
@@ -334,6 +334,8 @@ void manager_undo_generators(Manager *m);
 void manager_recheck_journal(Manager *m);
 
 void manager_set_show_status(Manager *m, ShowStatus mode);
+void manager_set_first_boot(Manager *m, bool b);
+
 void manager_status_printf(Manager *m, bool ephemeral, const char *status, const char *format, ...) _printf_(4,5);
 void manager_flip_auto_status(Manager *m, bool enable);
 

src/core/shutdown.c

@@ -375,7 +375,7 @@ int main(int argc, char *argv[]) {
         arguments[0] = NULL;
         arguments[1] = arg_verb;
         arguments[2] = NULL;
-        execute_directory(SYSTEM_SHUTDOWN_PATH, NULL, DEFAULT_TIMEOUT_USEC, arguments, NULL);
+        execute_directory(SYSTEM_SHUTDOWN_PATH, NULL, DEFAULT_TIMEOUT_USEC, arguments);
 
         if (!in_container && !in_initrd() &&
             access("/run/initramfs/shutdown", X_OK) == 0) {