Print location of loader.conf in bootctl status and related updates (#38389)

src/bootctl/bootctl-status.c

@@ -83,6 +83,17 @@ static int status_entries(
                 printf(", %s$BOOT%s", ansi_green(), ansi_normal());
         printf(")");
 
+        if (config->loader_conf_status != 0) {
+                assert(esp_path);
+                printf("\n       config: %s%s/%s%s",
+                       ansi_grey(), esp_path, ansi_normal(), "/loader/loader.conf");
+                if (config->loader_conf_status < 0)
+                        printf(": %s%s%s",
+                               config->loader_conf_status == -ENOENT ? ansi_grey() : ansi_highlight_yellow(),
+                               STRERROR(config->loader_conf_status),
+                               ansi_normal());
+        }
+
         if (xbootldr_path) {
                 printf("\n     XBOOTLDR: %s (", xbootldr_path);
                 if (!sd_id128_is_null(xbootldr_partition_uuid))

src/shared/bootspec.c

@@ -533,6 +533,7 @@ static int boot_loader_read_conf_path(BootConfig *config, const char *root, cons
         assert(path);
 
         r = chase_and_fopen_unlocked(path, root, CHASE_PREFIX_ROOT|CHASE_PROHIBIT_SYMLINKS, "re", &full, &f);
+        config->loader_conf_status = r < 0 ? r : true;
         if (r == -ENOENT)
                 return 0;
         if (r < 0)

src/shared/bootspec.h

@@ -67,6 +67,8 @@ typedef struct BootEntry {
         }
 
 typedef struct BootConfig {
+        int loader_conf_status;  /* 0 → before loading, 1 → loaded, negative → error. */
+
         char *default_pattern;
 
         char *entry_oneshot;