log: als turn on debug logging in non-PID1 if /proc/cmdline contains "debug"

1 files changed, 17 insertions, 0 deletions

diff --git a/src/shared/log.c b/src/shared/log.c
index 268f0340a1..2a075ffeba 100644
--- a/src/shared/log.c
+++ b/src/shared/log.c
@@ -879,7 +879,24 @@ int log_set_max_level_from_string(const char *e) {
 }
 
 void log_parse_environment(void) {
+        _cleanup_free_ char *line = NULL;
         const char *e;
+        int r;
+
+        r = proc_cmdline(&line);
+        if (r < 0)
+                log_warning("Failed to read /proc/cmdline. Ignoring: %s", strerror(-r));
+        else if (r > 0) {
+                char *w, *state;
+                size_t l;
+
+                FOREACH_WORD_QUOTED(w, l, line, state) {
+                        if (l == 5 && startswith(w, "debug")) {
+                                log_set_max_level(LOG_DEBUG);
+                                break;
+                        }
+                }
+        }
 
         e = secure_getenv("SYSTEMD_LOG_TARGET");
         if (e && log_set_target_from_string(e) < 0)