Remove dependency on non-POSIX header error.h.

[plocate] / updatedb.cpp

diff --git a/updatedb.cpp b/updatedb.cpp
index 8435a48b56f40ccaecf510913e15291050f336a9..e1320b3e1ef58affd7dda61f7486921589754f8f 100644 (file)
--- a/updatedb.cpp
+++ b/updatedb.cpp
@@ -92,7 +92,11 @@ int opendir_noatime(int dirfd, const char *path)
        static bool noatime_failed = false;
 
        if (!noatime_failed) {
+#ifdef O_NOATIME
                int fd = openat(dirfd, path, O_RDONLY | O_DIRECTORY | O_NOATIME);
+#else
+               int fd = openat(dirfd, path, O_RDONLY | O_DIRECTORY);
+#endif
                if (fd != -1) {
                        return fd;
                } else if (errno == EPERM) {
@@ -526,7 +530,7 @@ string ExistingDB::read_next_dictionary() const
 // “parent_dev” must be the device of the parent directory of “path”.
 //
 // Takes ownership of fd.
-int scan(const string &path, int fd, dev_t parent_dev, dir_time modified, dir_time db_modified, ExistingDB *existing_db, Corpus *corpus, DictionaryBuilder *dict_builder)
+int scan(const string &path, int fd, dev_t parent_dev, dir_time modified, dir_time db_modified, ExistingDB *existing_db, DatabaseReceiver *corpus, DictionaryBuilder *dict_builder)
 {
        if (string_list_contains_dir_path(&conf_prunepaths, &conf_prunepaths_index, path)) {
                if (conf_debug_pruning) {
@@ -606,8 +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;
@@ -624,7 +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);
@@ -693,7 +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);
                }
 
@@ -742,6 +780,15 @@ int main(int argc, char **argv)
        // and can set whatever we want). 128k should be ample for most setups.
        rlimit rlim;
        if (getrlimit(RLIMIT_NOFILE, &rlim) != -1) {
+               // Even root cannot increase rlim_cur beyond rlim_max,
+               // so we need to try to increase rlim_max first.
+               // Ignore errors, though.
+               if (rlim.rlim_max < 131072) {
+                       rlim.rlim_max = 131072;
+                       setrlimit(RLIMIT_NOFILE, &rlim);
+                       getrlimit(RLIMIT_NOFILE, &rlim);
+               }
+
                rlim_t wanted = std::max<rlim_t>(rlim.rlim_cur, 131072);
                rlim.rlim_cur = std::min<rlim_t>(wanted, rlim.rlim_max);
                setrlimit(RLIMIT_NOFILE, &rlim);  // Ignore errors.
@@ -769,7 +816,7 @@ int main(int argc, char **argv)
 
        DatabaseBuilder db(conf_output.c_str(), owner, conf_block_size, existing_db.read_next_dictionary(), conf_check_visibility);
        db.set_conf_block(conf_block);
-       Corpus *corpus = db.start_corpus(/*store_dir_times=*/true);
+       DatabaseReceiver *corpus = db.start_corpus(/*store_dir_times=*/true);
 
        int root_fd = opendir_noatime(AT_FDCWD, conf_scan_root);
        if (root_fd == -1) {