Re: [Libguestfs] [nbdkit PATCH 2/4] file: Add .list_exports support

Add a new mode to the file plugin, using directory=DIR instead of [file=]FILE, to allow it to serve all regular/block files in a given directory, as well as advertising the names of those files it will be serving. Signed-off-by: Eric Blake <eblake(a)redhat.com&gt; ---

+static int file_list_exports (int readonly, int default_only, + struct nbdkit_exports *exports)

+{ + struct dirent *entry; + struct stat sb; + int fd; + + if (!directory) + return nbdkit_add_export (exports, "", NULL); + + ACQUIRE_LOCK_FOR_CURRENT_SCOPE (&lock); + rewinddir (dir); + fd = dirfd (dir); + if (fd == -1) { + nbdkit_error ("dirfd: %m"); + return -1; + } + errno = 0; + while ((entry = readdir (dir)) != NULL) { + /* TODO: Optimize with d_type and/or statx when present? */ + if (fstatat (fd, entry->d_name, &sb, 0) == 0 && + (S_ISREG (sb.st_mode) || S_ISBLK (sb.st_mode))) { + if (nbdkit_add_export (exports, entry->d_name, NULL) == -1) { + close (fd);