Remove dependency on non-POSIX header error.h.

[plocate] / updatedb.cpp

diff --git a/updatedb.cpp b/updatedb.cpp
index 895b0715b05afce634a8916f576ccdf833230654..e1320b3e1ef58affd7dda61f7486921589754f8f 100644 (file)
--- a/updatedb.cpp
+++ b/updatedb.cpp
@@ -610,8 +610,12 @@ int scan(const string &path, int fd, dev_t parent_dev, dir_time modified, dir_ti
        } else {
                dir = fdopendir(fd);  // Takes over ownership of fd.
                if (dir == nullptr) {
-                       perror("fdopendir");
-                       exit(1);
+                       // fdopendir() wants to fstat() the fd to verify that it's indeed
+                       // a directory, which can seemingly fail on at least CIFS filesystems
+                       // if the server feels like it. We treat this as if we had an error
+                       // on opening it, ie., ignore the directory.
+                       close(fd);
+                       return 0;
                }
 
                dirent *de;
@@ -628,7 +632,23 @@ int scan(const string &path, int fd, dev_t parent_dev, dir_time modified, dir_ti
 
                        entry e;
                        e.name = de->d_name;
-                       e.is_directory = (de->d_type == DT_DIR);
+                       if (de->d_type == DT_UNKNOWN) {
+                               // Evidently some file systems, like older versions of XFS
+                               // (mkfs.xfs -m crc=0 -n ftype=0), can return this,
+                               // and we need a stat(). If we wanted to optimize for this,
+                               // we could probably defer it to later (we're stat-ing directories
+                               // when recursing), but this is rare, and not really worth it --
+                               // the second stat() will be cached anyway.
+                               struct stat buf;
+                               if (fstatat(fd, de->d_name, &buf, AT_SYMLINK_NOFOLLOW) == 0 &&
+                                   S_ISDIR(buf.st_mode)) {
+                                       e.is_directory = true;
+                               } else {
+                                       e.is_directory = false;
+                               }
+                       } else {
+                               e.is_directory = (de->d_type == DT_DIR);
+                       }
 
                        if (conf_verbose) {
                                printf("%s/%s\n", path.c_str(), de->d_name);
@@ -697,7 +717,21 @@ int scan(const string &path, int fd, dev_t parent_dev, dir_time modified, dir_ti
 
                struct stat buf;
                if (fstat(e.fd, &buf) != 0) {
-                       perror(path.c_str());
+                       // It's possible that this is a filesystem that's excluded
+                       // (and the failure is e.g. because the network is down).
+                       // As a last-ditch effort, we try to check that before dying,
+                       // i.e., duplicate the check from further down.
+                       //
+                       // It would be better to be able to run filesystem_is_excluded()
+                       // for cheap on everything and just avoid the stat, but it seems
+                       // hard to do that without any kind of raciness.
+                       if (filesystem_is_excluded((path_plus_slash + e.name).c_str())) {
+                               close(e.fd);
+                               e.fd = -1;
+                               continue;
+                       }
+
+                       perror((path_plus_slash + e.name).c_str());
                        exit(1);
                }