+
+int
+do_rm (const char *path)
+{
+ int r;
+
+ NEED_ROOT (-1);
+ ABS_PATH (path, -1);
+
+ CHROOT_IN;
+ r = unlink (path);
+ CHROOT_OUT;
+
+ if (r == -1) {
+ reply_with_perror ("unlink: %s", path);
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+do_chmod (int mode, const char *path)
+{
+ int r;
+
+ NEED_ROOT (-1);
+ ABS_PATH (path, -1);
+
+ CHROOT_IN;
+ r = chmod (path, mode);
+ CHROOT_OUT;
+
+ if (r == -1) {
+ reply_with_perror ("chmod: %s: 0%o", path, mode);
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+do_chown (int owner, int group, const char *path)
+{
+ int r;
+
+ NEED_ROOT (-1);
+ ABS_PATH (path, -1);
+
+ CHROOT_IN;
+ r = chown (path, owner, group);
+ CHROOT_OUT;
+
+ if (r == -1) {
+ reply_with_perror ("chown: %s: %d.%d", path, owner, group);
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+do_exists (const char *path)
+{
+ int r;
+
+ NEED_ROOT (-1);
+ ABS_PATH (path, -1);
+
+ CHROOT_IN;
+ r = access (path, F_OK);
+ CHROOT_OUT;
+
+ return r == 0;
+}
+
+int
+do_is_file (const char *path)
+{
+ int r;
+ struct stat buf;
+
+ NEED_ROOT (-1);
+ ABS_PATH (path, -1);
+
+ CHROOT_IN;
+ r = lstat (path, &buf);
+ CHROOT_OUT;
+
+ if (r == -1) {
+ if (errno != ENOENT && errno != ENOTDIR) {
+ reply_with_perror ("stat: %s", path);
+ return -1;
+ }
+ else
+ return 0; /* Not a file. */
+ }
+
+ return S_ISREG (buf.st_mode);
+}
+
+int
+do_write_file (const char *path, const char *content, int size)
+{
+ int fd;
+
+ NEED_ROOT (-1);
+ ABS_PATH (path, -1);
+
+ if (size == 0)
+ size = strlen (content);
+
+ CHROOT_IN;
+ fd = open (path, O_WRONLY | O_TRUNC | O_CREAT | O_NOCTTY, 0666);
+ CHROOT_OUT;
+
+ if (fd == -1) {
+ reply_with_perror ("open: %s", path);
+ return -1;
+ }
+
+ if (xwrite (fd, content, size) == -1) {
+ reply_with_perror ("write");
+ close (fd);
+ return -1;
+ }
+
+ if (close (fd) == -1) {
+ reply_with_perror ("close: %s", path);
+ return -1;
+ }
+
+ return 0;
+}
+
+/* This runs the 'file' command. */
+char *
+do_file (const char *path)
+{
+ char *out, *err;
+ int r, len, freeit = 0;
+ char *buf;
+
+ NEED_ROOT_OR_IS_DEVICE (path, NULL);
+ ABS_PATH (path, NULL);
+
+ if (strncmp (path, "/dev/", 5) == 0)
+ buf = (char *) path;
+ else {
+ len = strlen (path) + 9;
+ buf = malloc (len);
+ if (!buf) {
+ reply_with_perror ("malloc");
+ return NULL;
+ }
+ snprintf (buf, len, "/sysroot%s", path);
+ freeit = 1;
+ }
+
+ /* file(1) manpage claims "file returns 0 on success, and non-zero on
+ * error", but this is evidently not true. It always returns 0, in
+ * every scenario I can think up. So check the target is readable
+ * first.
+ */
+ if (access (buf, R_OK) == -1) {
+ if (freeit) free (buf);
+ reply_with_perror ("access: %s", path);
+ return NULL;
+ }
+
+ r = command (&out, &err, "file", "-bsL", buf, NULL);
+ if (freeit) free (buf);
+
+ if (r == -1) {
+ free (out);
+ reply_with_error ("file: %s: %s", path, err);
+ free (err);
+ return NULL;
+ }
+ free (err);
+
+ /* We need to remove the trailing \n from output of file(1). */
+ len = strlen (out);
+ if (out[len-1] == '\n')
+ out[len-1] = '\0';
+
+ return out; /* caller frees */
+}