delta: diff returns 1 when files differ, ignore this

https://bugs.debian/org/771397

src/core/shutdown.c

@@ -367,7 +367,7 @@ int main(int argc, char *argv[]) {
                                 execv(args[0], (char * const *) args);
                                 _exit(EXIT_FAILURE);
                         } else
-                                wait_for_terminate_and_warn("kexec", pid);
+                                wait_for_terminate_and_warn("kexec", pid, true);
                 }
 
                 cmd = RB_AUTOBOOT;

src/delta/delta.c

@@ -193,7 +193,7 @@ static int found_override(const char *top, const char *bottom) {
                 _exit(1);
         }
 
-        wait_for_terminate_and_warn("diff", pid);
+        wait_for_terminate_and_warn("diff", pid, false);
         putchar('\n');
 
         return k;

src/login/inhibit.c

@@ -280,7 +280,7 @@ int main(int argc, char *argv[]) {
                         _exit(EXIT_FAILURE);
                 }
 
-                r = wait_for_terminate_and_warn(argv[optind], pid);
+                r = wait_for_terminate_and_warn(argv[optind], pid, true);
                 return r < 0 ? EXIT_FAILURE : r;
         }
 

src/nspawn/nspawn.c

@@ -2544,7 +2544,7 @@ static int change_uid_gid(char **_home) {
 
         truncate_nl(line);
 
-        wait_for_terminate_and_warn("getent passwd", pid);
+        wait_for_terminate_and_warn("getent passwd", pid, true);
 
         x = strchr(line, ':');
         if (!x) {
@@ -2628,7 +2628,7 @@ static int change_uid_gid(char **_home) {
 
         truncate_nl(line);
 
-        wait_for_terminate_and_warn("getent initgroups", pid);
+        wait_for_terminate_and_warn("getent initgroups", pid, true);
 
         /* Skip over the username and subsequent separator whitespace */
         x = line;

src/quotacheck/quotacheck.c

@@ -111,7 +111,7 @@ int main(int argc, char *argv[]) {
                 _exit(1); /* Operational error */
         }
 
-        r = wait_for_terminate_and_warn("quotacheck", pid);
+        r = wait_for_terminate_and_warn("quotacheck", pid, true);
 
         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 }

src/shared/util.c

@@ -3786,8 +3786,11 @@ int wait_for_terminate(pid_t pid, siginfo_t *status) {
  *
  * That is, success is indicated by a return value of zero, and an
  * error is indicated by a non-zero value.
+ *
+ * A warning is emitted if the process terminates abnormally,
+ * and also if it returns non-zero unless check_exit_code is true.
  */
-int wait_for_terminate_and_warn(const char *name, pid_t pid) {
+int wait_for_terminate_and_warn(const char *name, pid_t pid, bool check_exit_code) {
         int r;
         siginfo_t status;
 
@@ -3799,14 +3802,13 @@ int wait_for_terminate_and_warn(const char *name, pid_t pid) {
                 return log_warning_errno(r, "Failed to wait for %s: %m", name);
 
         if (status.si_code == CLD_EXITED) {
-                if (status.si_status != 0) {
-                        log_warning("%s failed with error code %i.", name, status.si_status);
-                        return status.si_status;
-                }
-
-                log_debug("%s succeeded.", name);
-                return 0;
+                if (status.si_status != 0)
+                        log_full(check_exit_code ? LOG_WARNING : LOG_DEBUG,
+                                 "%s failed with error code %i.", name, status.si_status);
+                else
+                        log_debug("%s succeeded.", name);
 
+                return status.si_status;
         } else if (status.si_code == CLD_KILLED ||
                    status.si_code == CLD_DUMPED) {
 
@@ -4161,13 +4163,13 @@ void execute_directory(const char *directory, DIR *d, usec_t timeout, char *argv
                         path = hashmap_remove(pids, UINT_TO_PTR(pid));
                         assert(path);
 
-                        wait_for_terminate_and_warn(path, pid);
+                        wait_for_terminate_and_warn(path, pid, true);
                 }
 
                 _exit(EXIT_SUCCESS);
         }
 
-        wait_for_terminate_and_warn(directory, executor_pid);
+        wait_for_terminate_and_warn(directory, executor_pid, true);
 }
 
 int kill_and_sigcont(pid_t pid, int sig) {

src/shared/util.h

@@ -513,7 +513,7 @@ char *unquote(const char *s, const char *quotes);
 char *normalize_env_assignment(const char *s);
 
 int wait_for_terminate(pid_t pid, siginfo_t *status);
-int wait_for_terminate_and_warn(const char *name, pid_t pid);
+int wait_for_terminate_and_warn(const char *name, pid_t pid, bool check_exit_code);
 
 noreturn void freeze(void);
 

src/vconsole/vconsole-setup.c

@@ -308,7 +308,7 @@ int main(int argc, char **argv) {
         }
 
         if (font_pid > 0)
-                wait_for_terminate_and_warn(KBD_SETFONT, font_pid);
+                wait_for_terminate_and_warn(KBD_SETFONT, font_pid, true);
 
         r = keymap_load(vc, vc_keymap, vc_keymap_toggle, utf8, &keymap_pid);
         if (r < 0) {
@@ -317,7 +317,7 @@ int main(int argc, char **argv) {
         }
 
         if (keymap_pid > 0)
-                wait_for_terminate_and_warn(KBD_LOADKEYS, keymap_pid);
+                wait_for_terminate_and_warn(KBD_LOADKEYS, keymap_pid, true);
 
         /* Only copy the font when we started setfont successfully */
         if (font_copy && font_pid > 0)