stat-util: Make sure we trigger automounts when looking for ESP/XBOOTLDR

Fixes #25417

src/shared/find-esp.c

@@ -17,6 +17,7 @@
 #include "fd-util.h"
 #include "find-esp.h"
 #include "gpt.h"
+#include "mount-util.h"
 #include "parse-util.h"
 #include "path-util.h"
 #include "stat-util.h"
@@ -363,6 +364,12 @@ static int verify_esp(
                 if (r < 0 && r != -EADDRNOTAVAIL)
                         return log_error_errno(r, "Failed to extract filename of %s: %m", p);
 
+                /* Trigger any automounts so that xstatfsat() operates on the mount instead of the mountpoint
+                 * directory. */
+                r = trigger_automount_at(pfd, f);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to trigger automount at %s: %m", p);
+
                 r = xstatfsat(pfd, strempty(f), &sfs);
                 if (r < 0)
                         /* If we are searching for the mount point, don't generate a log message if we can't find the path */

src/shared/mount-util.c

@@ -1455,3 +1455,17 @@ int make_mount_point_inode_from_path(const char *source, const char *dest, mode_
 
         return make_mount_point_inode_from_stat(&st, dest, mode);
 }
+
+int trigger_automount_at(int dir_fd, const char *path) {
+        _cleanup_free_ char *nested = NULL;
+
+        assert(dir_fd >= 0 || dir_fd == AT_FDCWD);
+
+        nested = path_join(path, "a");
+        if (!nested)
+                return -ENOMEM;
+
+        (void) faccessat(dir_fd, nested, F_OK, 0);
+
+        return 0;
+}

src/shared/mount-util.h

@@ -139,3 +139,5 @@ int bind_mount_submounts(
 /* Creates a mount point (not parents) based on the source path or stat - ie, a file or a directory */
 int make_mount_point_inode_from_stat(const struct stat *st, const char *dest, mode_t mode);
 int make_mount_point_inode_from_path(const char *source, const char *dest, mode_t mode);
+
+int trigger_automount_at(int dir_fd, const char *path);