test-recurse-dir: work around nftw() ignoring symlinks()

We have a test where we compare the results from nftw() and our own
resurce_dit_at(). nftw() skips a dangling symlink when running under mkosi and
the test fails. I don't understand why nftw() does that, but in our code we
don't need to test and care about the details of nftw(), which we don't use,
outside of the one test, so let's just skip symlinks in the test.

Closes #29603.

diff --git a/src/test/test-recurse-dir.c b/src/test/test-recurse-dir.c
index 2c2120b136fda51fb84a4d94e37e53213f22871b..c194896a1b5885e2ded3cfa6a294ee9b7994df69 100644 (file)
--- a/src/test/test-recurse-dir.c
+++ b/src/test/test-recurse-dir.c
@@ -26,8 +26,7 @@ static int nftw_cb(
                 break;
 
         case FTW_SL:
-                log_debug("ftw found symlink %s", fpath);
-                assert_se(strv_extendf(&list_nftw, "%s→", fpath) >= 0);
+                log_debug("ftw found symlink %s, ignoring.", fpath);
                 break;
 
         case FTW_D:
@@ -71,11 +70,10 @@ static int recurse_dir_callback(
         case RECURSE_DIR_ENTRY:
                 assert_se(!IN_SET(de->d_type, DT_UNKNOWN, DT_DIR));
 
-                log_debug("found %s", path);
+                log_debug("found %s%s", path,
+                          de->d_type == DT_LNK ? ", ignoring." : "");
 
-                if (de->d_type == DT_LNK)
-                        assert_se(strv_extendf(l, "%s→", path) >= 0);
-                else
+                if (de->d_type != DT_LNK)
                         assert_se(strv_extend(l, path) >= 0);
                 break;
 
@@ -131,7 +129,10 @@ int main(int argc, char *argv[]) {
         else
                 p = "/usr/share/man"; /* something hopefully reasonably stable while we run (and limited in size) */
 
-        /* Enumerate the specified dirs in full, once via nftw(), and once via recurse_dir(), and ensure the results are identical */
+        /* Enumerate the specified dirs in full, once via nftw(), and once via recurse_dir(), and ensure the
+         * results are identical. nftw() sometimes skips symlinks (see
+         * https://github.com/systemd/systemd/issues/29603), so ignore them to avoid bogus errors. */
+
         t1 = now(CLOCK_MONOTONIC);
         r = recurse_dir_at(AT_FDCWD, p, 0, UINT_MAX, RECURSE_DIR_SORT|RECURSE_DIR_ENSURE_TYPE|RECURSE_DIR_SAME_MOUNT, recurse_dir_callback, &list_recurse_dir);
         t2 = now(CLOCK_MONOTONIC);