Add 'initrd-list' command to list contents of initrd images.

[libguestfs.git] / daemon / initrd.c

diff --git a/daemon/initrd.c b/daemon/initrd.c
new file mode 100644 (file)
index 0000000..513ed8d
--- /dev/null
+++ b/daemon/initrd.c
@@ -0,0 +1,88 @@
+/* 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 "../src/guestfs_protocol.h"
+#include "daemon.h"
+#include "actions.h"
+
+char **
+do_initrd_list (char *path)
+{
+  FILE *fp;
+  int len;
+  char *cmd;
+  char filename[PATH_MAX];
+  char **filenames = NULL;
+  int size = 0, alloc = 0;
+
+  NEED_ROOT (NULL);
+  ABS_PATH (path, NULL);
+
+  /* "zcat /sysroot/<path> | cpio --quiet -it", but path must be quoted. */
+  len = 64 + 2 * strlen (path);
+  cmd = malloc (len);
+  if (!cmd) {
+    reply_with_perror ("malloc");
+    return NULL;
+  }
+
+  strcpy (cmd, "zcat /sysroot");
+  shell_quote (cmd+13, len-13, path);
+  strcat (cmd, " | cpio --quiet -it");
+
+  fprintf (stderr, "%s\n", cmd);
+
+  fp = popen (cmd, "r");
+  if (fp == NULL) {
+    reply_with_perror ("popen: %s", cmd);
+    free (cmd);
+    return NULL;
+  }
+  free (cmd);
+
+  while (fgets (filename, sizeof filename, fp) != NULL) {
+    len = strlen (filename);
+    if (len > 0 && filename[len-1] == '\n')
+      filename[len-1] = '\0';
+
+    if (add_string (&filenames, &size, &alloc, filename) == -1) {
+      pclose (fp);
+      return NULL;
+    }
+  }
+
+  if (add_string (&filenames, &size, &alloc, NULL) == -1) {
+    pclose (fp);
+    return NULL;
+  }
+
+  if (pclose (fp) == -1) {
+    reply_with_perror ("pclose");
+    free_strings (filenames);
+    return NULL;
+  }
+
+  return filenames;
+}