From 43f565c6770f940a978a5325fea8b0e6d8ee4c99 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Mon, 1 Feb 2021 00:51:33 +0900
Subject: core: also set $SYSTEMD_EXEC_PID= for generators

---
 src/core/manager.c     |  6 ++++--
 src/shared/exec-util.c | 10 ++++++++--
 src/shared/exec-util.h |  7 ++++---
 3 files changed, 16 insertions(+), 7 deletions(-)

(limited to 'src')

diff --git a/src/core/manager.c b/src/core/manager.c
index a1d6f7cc10..73a850e5da 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -4105,7 +4105,8 @@ static int manager_run_environment_generators(Manager *m) {
 
         RUN_WITH_UMASK(0022)
                 r = execute_directories((const char* const*) paths, DEFAULT_TIMEOUT_USEC, gather_environment,
-                                        args, NULL, m->transient_environment, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS);
+                                        args, NULL, m->transient_environment,
+                                        EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS | EXEC_DIR_SET_SYSTEMD_EXEC_PID);
         return r;
 }
 
@@ -4140,7 +4141,8 @@ static int manager_run_generators(Manager *m) {
 
         RUN_WITH_UMASK(0022)
                 (void) execute_directories((const char* const*) paths, DEFAULT_TIMEOUT_USEC, NULL, NULL,
-                                           (char**) argv, m->transient_environment, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS);
+                                           (char**) argv, m->transient_environment,
+                                           EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS | EXEC_DIR_SET_SYSTEMD_EXEC_PID);
 
         r = 0;
 
diff --git a/src/shared/exec-util.c b/src/shared/exec-util.c
index bdea60ca02..6355ce8ce4 100644
--- a/src/shared/exec-util.c
+++ b/src/shared/exec-util.c
@@ -34,7 +34,7 @@
 /* Put this test here for a lack of better place */
 assert_cc(EAGAIN == EWOULDBLOCK);
 
-static int do_spawn(const char *path, char *argv[], int stdout_fd, pid_t *pid) {
+static int do_spawn(const char *path, char *argv[], int stdout_fd, pid_t *pid, bool set_systemd_exec_pid) {
         pid_t _pid;
         int r;
 
@@ -57,6 +57,12 @@ static int do_spawn(const char *path, char *argv[], int stdout_fd, pid_t *pid) {
 
                 (void) rlimit_nofile_safe();
 
+                if (set_systemd_exec_pid) {
+                        r = setenv_systemd_exec_pid(false);
+                        if (r < 0)
+                                log_warning_errno(r, "Failed to set $SYSTEMD_EXEC_PID, ignoring: %m");
+                }
+
                 if (!argv) {
                         _argv[0] = (char*) path;
                         _argv[1] = NULL;
@@ -132,7 +138,7 @@ static int do_execute(
                                 return log_error_errno(fd, "Failed to open serialization file: %m");
                 }
 
-                r = do_spawn(t, argv, fd, &pid);
+                r = do_spawn(t, argv, fd, &pid, FLAGS_SET(flags, EXEC_DIR_SET_SYSTEMD_EXEC_PID));
                 if (r <= 0)
                         continue;
 
diff --git a/src/shared/exec-util.h b/src/shared/exec-util.h
index df6214e4c3..5bd4a3785f 100644
--- a/src/shared/exec-util.h
+++ b/src/shared/exec-util.h
@@ -15,9 +15,10 @@ enum {
 };
 
 typedef enum {
-        EXEC_DIR_NONE          = 0,      /* No execdir flags */
-        EXEC_DIR_PARALLEL      = 1 << 0, /* Execute scripts in parallel, if possible */
-        EXEC_DIR_IGNORE_ERRORS = 1 << 1, /* Ignore non-zero exit status of scripts */
+        EXEC_DIR_NONE                 = 0,      /* No execdir flags */
+        EXEC_DIR_PARALLEL             = 1 << 0, /* Execute scripts in parallel, if possible */
+        EXEC_DIR_IGNORE_ERRORS        = 1 << 1, /* Ignore non-zero exit status of scripts */
+        EXEC_DIR_SET_SYSTEMD_EXEC_PID = 1 << 2, /* Set $SYSTEMD_EXEC_PID environment variable */
 } ExecDirFlags;
 
 typedef enum ExecCommandFlags {
-- 
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