New commands: rm rmdir rm-rf mkdir mkdir-p chmod chown

[libguestfs.git] / daemon / dir.c

diff --git a/daemon/dir.c b/daemon/dir.c
new file mode 100644 (file)
index 0000000..7892682
--- /dev/null
+++ b/daemon/dir.c
@@ -0,0 +1,167 @@
+/* libguestfs - the guestfsd daemon
+ * Copyright (C) 2009 Red Hat Inc. 
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "../src/guestfs_protocol.h"
+#include "daemon.h"
+#include "actions.h"
+
+int
+do_rmdir (const char *path)
+{
+  int r;
+
+  NEED_ROOT (-1);
+  ABS_PATH (path, -1);
+
+  CHROOT_IN;
+  r = rmdir (path);
+  CHROOT_OUT;
+
+  if (r == -1) {
+    reply_with_perror ("rmdir: %s", path);
+    return -1;
+  }
+
+  return 0;
+}
+
+/* This implementation is quick and dirty, and allows people to try
+ * to remove parts of the initramfs (eg. "rm -r /..") but if people
+ * do stupid stuff, who are we to try to stop them?
+ */
+int
+do_rm_rf (const char *path)
+{
+  int r, len;
+  char *buf, *err;
+
+  NEED_ROOT (-1);
+  ABS_PATH (path, -1);
+
+  if (strcmp (path, "/") == 0) {
+    reply_with_error ("rm -rf: cannot remove root directory");
+    return -1;
+  }
+
+  len = strlen (path) + 9;
+  buf = malloc (len);
+  if (buf == NULL) {
+    reply_with_perror ("malloc");
+    return -1;
+  }
+
+  snprintf (buf, len, "/sysroot%s", path);
+
+  r = command (NULL, &err, "rm", "-rf", buf);
+  free (buf);
+
+  /* rm -rf is never supposed to fail.  I/O errors perhaps? */
+  if (r == -1) {
+    reply_with_error ("rm -rf: %s: %s", path, err);
+    free (err);
+    return -1;
+  }
+
+  free (err);
+
+  return 0;
+}
+
+int
+do_mkdir (const char *path)
+{
+  int r;
+
+  NEED_ROOT (-1);
+  ABS_PATH (path, -1);
+
+  CHROOT_IN;
+  r = mkdir (path, 0777);
+  CHROOT_OUT;
+
+  if (r == -1) {
+    reply_with_perror ("mkdir: %s", path);
+    return -1;
+  }
+
+  return 0;
+}
+
+static int
+recursive_mkdir (const char *path)
+{
+  int loop = 0;
+  int r;
+  char *ppath, *p;
+
+ again:
+  r = mkdir (path, 0777);
+  if (r == -1) {
+    if (!loop && errno == ENOENT) {
+      loop = 1;                        /* Stops it looping forever. */
+
+      /* If we're at the root, and we failed, just give up. */
+      if (path[0] == '/' && path[1] == '\0') return -1;
+
+      /* Try to make the parent directory first. */
+      ppath = strdup (path);
+      if (ppath == NULL) return -1;
+
+      p = strrchr (ppath, '/');
+      if (p) *p = '\0';
+
+      r = recursive_mkdir (ppath);
+      free (ppath);
+
+      if (r == -1) return -1;
+
+      goto again;
+    } else       /* Failed for some other reason, so return error. */
+      return -1;
+  }
+  return 0;
+}
+
+int
+do_mkdir_p (const char *path)
+{
+  int r;
+
+  NEED_ROOT (-1);
+  ABS_PATH (path, -1);
+
+  CHROOT_IN;
+  r = recursive_mkdir (path);
+  CHROOT_OUT;
+
+  if (r == -1) {
+    reply_with_perror ("mkdir -p: %s", path);
+    return -1;
+  }
+
+  return 0;
+}