+ /* Mustn't touch *size_r until we are sure that we won't return any
+ * error (RHBZ#589039).
+ */
+ *size_r = r;
+ return buf;
+}
+
+int
+do_pwrite (const char *path, const char *content, size_t size, int64_t offset)
+{
+ int fd;
+ ssize_t r;
+
+ CHROOT_IN;
+ fd = open (path, O_WRONLY);
+ CHROOT_OUT;
+
+ if (fd == -1) {
+ reply_with_perror ("open: %s", path);
+ return -1;
+ }
+
+ r = pwrite (fd, content, size, offset);
+ if (r == -1) {
+ reply_with_perror ("pwrite: %s", path);
+ close (fd);
+ return -1;
+ }
+
+ if (close (fd) == -1) {
+ reply_with_perror ("close: %s", path);
+ close (fd);
+ return -1;
+ }
+
+ return r;
+}
+
+/* This runs the 'file' command. */
+char *
+do_file (const char *path)
+{
+ char *buf = NULL;
+ const char *display_path = path;
+
+ int is_dev = STRPREFIX (path, "/dev/");
+
+ if (!is_dev) {
+ buf = sysroot_path (path);
+ if (!buf) {
+ reply_with_perror ("malloc");
+ return NULL;
+ }
+ path = buf;
+
+ /* For non-dev, check this is a regular file, else just return the
+ * file type as a string (RHBZ#582484).
+ */
+ struct stat statbuf;
+ if (lstat (path, &statbuf) == -1) {
+ reply_with_perror ("lstat: %s", display_path);
+ free (buf);
+ return NULL;
+ }
+
+ if (! S_ISREG (statbuf.st_mode)) {
+ char *ret;
+
+ free (buf);
+
+ if (S_ISDIR (statbuf.st_mode))
+ ret = strdup ("directory");
+ else if (S_ISCHR (statbuf.st_mode))
+ ret = strdup ("character device");
+ else if (S_ISBLK (statbuf.st_mode))
+ ret = strdup ("block device");
+ else if (S_ISFIFO (statbuf.st_mode))
+ ret = strdup ("FIFO");
+ else if (S_ISLNK (statbuf.st_mode))
+ ret = strdup ("symbolic link");
+ else if (S_ISSOCK (statbuf.st_mode))
+ ret = strdup ("socket");
+ else
+ ret = strdup ("unknown, not regular file");
+
+ if (ret == NULL)
+ reply_with_perror ("strdup");
+ return ret;
+ }
+ }
+
+ /* Which flags to use? For /dev paths, follow links because
+ * /dev/VG/LV is a symbolic link.
+ */
+ const char *flags = is_dev ? "-zbsL" : "-zb";
+
+ char *out, *err;
+ int r = command (&out, &err, "file", flags, path, NULL);