lib: Make pcre, libmagic and hivex libraries optional.

[libguestfs.git] / src / listfs.c

diff --git a/src/listfs.c b/src/listfs.c
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index 0000000..a89cd9b
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+++ b/src/listfs.c
@@ -0,0 +1,169 @@
+/* libguestfs
+ * Copyright (C) 2010 Red Hat Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#include "guestfs.h"
+#include "guestfs-internal.h"
+#include "guestfs-internal-actions.h"
+#include "guestfs_protocol.h"
+
+/* List filesystems.
+ *
+ * The current implementation just uses guestfs_vfs_type and doesn't
+ * try mounting anything, but we reserve the right in future to try
+ * mounting filesystems.
+ */
+
+static void remove_from_list (char **list, const char *item);
+static void check_with_vfs_type (guestfs_h *g, const char *dev, char ***ret, size_t *ret_size);
+
+char **
+guestfs__list_filesystems (guestfs_h *g)
+{
+  size_t i;
+  char **ret;
+  size_t ret_size;
+
+  ret = safe_malloc (g, sizeof (char *));
+  ret[0] = NULL;
+  ret_size = 0;
+
+  /* Look to see if any devices directly contain filesystems
+   * (RHBZ#590167).  However vfs-type will fail to tell us anything
+   * useful about devices which just contain partitions, so we also
+   * get the list of partitions and exclude the corresponding devices
+   * by using part-to-dev.
+   */
+  char **devices;
+  devices = guestfs_list_devices (g);
+  if (devices == NULL) {
+    guestfs___free_string_list (ret);
+    return NULL;
+  }
+  char **partitions;
+  partitions = guestfs_list_partitions (g);
+  if (partitions == NULL) {
+    guestfs___free_string_list (devices);
+    guestfs___free_string_list (ret);
+    return NULL;
+  }
+
+  for (i = 0; partitions[i] != NULL; ++i) {
+    char *dev = guestfs_part_to_dev (g, partitions[i]);
+    if (dev)
+      remove_from_list (devices, dev);
+    free (dev);
+  }
+
+  /* Use vfs-type to check for filesystems on devices. */
+  for (i = 0; devices[i] != NULL; ++i)
+    check_with_vfs_type (g, devices[i], &ret, &ret_size);
+  guestfs___free_string_list (devices);
+
+  /* Use vfs-type to check for filesystems on partitions. */
+  for (i = 0; partitions[i] != NULL; ++i)
+    check_with_vfs_type (g, partitions[i], &ret, &ret_size);
+  guestfs___free_string_list (partitions);
+
+  if (guestfs___feature_available (g, "lvm2")) {
+    /* Use vfs-type to check for filesystems on LVs. */
+    char **lvs;
+    lvs = guestfs_lvs (g);
+    if (lvs == NULL) {
+      guestfs___free_string_list (ret);
+      return NULL;
+    }
+
+    for (i = 0; lvs[i] != NULL; ++i)
+      check_with_vfs_type (g, lvs[i], &ret, &ret_size);
+    guestfs___free_string_list (lvs);
+  }
+
+  return ret;
+}
+
+/* If 'item' occurs in 'list', remove and free it. */
+static void
+remove_from_list (char **list, const char *item)
+{
+  size_t i;
+
+  for (i = 0; list[i] != NULL; ++i)
+    if (STREQ (list[i], item)) {
+      free (list[i]);
+      for (; list[i+1] != NULL; ++i)
+        list[i] = list[i+1];
+      list[i] = NULL;
+      return;
+    }
+}
+
+/* Use vfs-type to look for a filesystem of some sort on 'dev'.
+ * Apart from some types which we ignore, add the result to the
+ * 'ret' string list.
+ */
+static void
+check_with_vfs_type (guestfs_h *g, const char *device,
+                     char ***ret, size_t *ret_size)
+{
+  char *v;
+
+  guestfs_error_handler_cb old_error_cb = g->error_cb;
+  g->error_cb = NULL;
+  char *vfs_type = guestfs_vfs_type (g, device);
+  g->error_cb = old_error_cb;
+
+  if (!vfs_type)
+    v = safe_strdup (g, "unknown");
+  else {
+    /* Ignore all "*_member" strings.  In libblkid these are returned
+     * for things which are members of some RAID or LVM set, most
+     * importantly "LVM2_member" which is a PV.
+     */
+    size_t n = strlen (vfs_type);
+    if (n >= 7 && STREQ (&vfs_type[n-7], "_member")) {
+      free (vfs_type);
+      return;
+    }
+
+    /* Ignore LUKS-encrypted partitions.  These are also containers. */
+    if (STREQ (vfs_type, "crypto_LUKS")) {
+      free (vfs_type);
+      return;
+    }
+
+    v = vfs_type;
+  }
+
+  /* Extend the return array. */
+  size_t i = *ret_size;
+  *ret_size += 2;
+  *ret = safe_realloc (g, *ret, (*ret_size + 1) * sizeof (char *));
+  (*ret)[i] = safe_strdup (g, device);
+  (*ret)[i+1] = v;
+  (*ret)[i+2] = NULL;
+}