+ int r;
+
+ CHROOT_IN;
+ fd = open (path, O_WRONLY | O_CREAT | O_NOCTTY, 0666);
+ CHROOT_OUT;
+
+ if (fd == -1) {
+ reply_with_perror ("open: %s", path);
+ return -1;
+ }
+
+ r = futimens (fd, NULL);
+ if (r == -1) {
+ reply_with_perror ("futimens: %s", path);
+ close (fd);
+ return -1;
+ }
+
+ if (close (fd) == -1) {
+ reply_with_perror ("close: %s", path);
+ return -1;
+ }
+
+ return 0;
+}
+
+char *
+do_cat (const char *path)
+{
+ int fd;
+ int alloc, size, r, max;
+ char *buf, *buf2;
+
+ CHROOT_IN;
+ fd = open (path, O_RDONLY);
+ CHROOT_OUT;
+
+ if (fd == -1) {
+ reply_with_perror ("open: %s", path);
+ return NULL;
+ }
+
+ /* Read up to GUESTFS_MESSAGE_MAX - <overhead> bytes. If it's
+ * larger than that, we need to return an error instead (for
+ * correctness).
+ */
+ max = GUESTFS_MESSAGE_MAX - 1000;
+ buf = NULL;
+ size = alloc = 0;
+
+ for (;;) {
+ if (size >= alloc) {
+ alloc += 8192;
+ if (alloc > max) {
+ reply_with_error ("%s: file is too large for message buffer",
+ path);
+ free (buf);
+ close (fd);
+ return NULL;
+ }
+ buf2 = realloc (buf, alloc);
+ if (buf2 == NULL) {
+ reply_with_perror ("realloc");
+ free (buf);
+ close (fd);
+ return NULL;
+ }
+ buf = buf2;
+ }
+
+ r = read (fd, buf + size, alloc - size);
+ if (r == -1) {
+ reply_with_perror ("read: %s", path);
+ free (buf);
+ close (fd);
+ return NULL;
+ }
+ if (r == 0) {
+ buf[size] = '\0';
+ break;
+ }
+ if (r > 0)
+ size += r;
+ }
+
+ if (close (fd) == -1) {
+ reply_with_perror ("close: %s", path);
+ free (buf);
+ return NULL;
+ }
+
+ return buf; /* caller will free */
+}
+
+char **
+do_read_lines (const char *path)
+{
+ char **r = NULL;
+ int size = 0, alloc = 0;
+ FILE *fp;
+ char *line = NULL;
+ size_t len = 0;
+ ssize_t n;
+
+ CHROOT_IN;
+ fp = fopen (path, "r");
+ CHROOT_OUT;
+
+ if (!fp) {
+ reply_with_perror ("fopen: %s", path);
+ return NULL;
+ }
+
+ while ((n = getline (&line, &len, fp)) != -1) {
+ /* Remove either LF or CRLF. */
+ if (n >= 2 && line[n-2] == '\r' && line[n-1] == '\n')
+ line[n-2] = '\0';
+ else if (n >= 1 && line[n-1] == '\n')
+ line[n-1] = '\0';
+
+ if (add_string (&r, &size, &alloc, line) == -1) {
+ free (line);
+ fclose (fp);
+ return NULL;
+ }
+ }
+
+ free (line);
+
+ if (add_string (&r, &size, &alloc, NULL) == -1) {
+ fclose (fp);
+ return NULL;
+ }
+
+ if (fclose (fp) == EOF) {
+ reply_with_perror ("fclose: %s", path);
+ free_strings (r);
+ return NULL;
+ }
+
+ return r;
+}
+
+int
+do_rm (const char *path)
+{
+ int r;
+
+ CHROOT_IN;
+ r = unlink (path);
+ CHROOT_OUT;
+
+ if (r == -1) {
+ reply_with_perror ("%s", path);
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+do_chmod (int mode, const char *path)
+{
+ int r;
+
+ if (mode < 0) {
+ reply_with_error ("%s: mode is negative", path);
+ return -1;
+ }
+
+ CHROOT_IN;
+ r = chmod (path, mode);
+ CHROOT_OUT;
+
+ if (r == -1) {
+ reply_with_perror ("%s: 0%o", path, mode);
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+do_chown (int owner, int group, const char *path)
+{
+ int r;
+
+ CHROOT_IN;
+ r = chown (path, owner, group);
+ CHROOT_OUT;
+
+ if (r == -1) {
+ reply_with_perror ("%s: %d.%d", path, owner, group);
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+do_lchown (int owner, int group, const char *path)
+{
+ int r;
+
+ CHROOT_IN;
+ r = lchown (path, owner, group);
+ CHROOT_OUT;
+
+ if (r == -1) {
+ reply_with_perror ("%s: %d.%d", path, owner, group);
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+do_exists (const char *path)
+{
+ int r;
+
+ CHROOT_IN;
+ r = access (path, F_OK);
+ CHROOT_OUT;
+
+ return r == 0;
+}
+
+int
+do_is_file (const char *path)
+{
+ int r;
+ struct stat buf;
+
+ 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;