Rename tune2fs.c -> ext2.c

daemon/ext2.c

@@ -0,0 +1,236 @@
+/* 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 <unistd.h>
+#include <ctype.h>
+
+#include "../src/guestfs_protocol.h"
+#include "daemon.h"
+#include "actions.h"
+
+char **
+do_tune2fs_l (const char *device)
+{
+  int r;
+  char *out, *err;
+  char *p, *pend, *colon;
+  char **ret = NULL;
+  int size = 0, alloc = 0;
+
+  IS_DEVICE (device, NULL);
+
+  r = command (&out, &err, "/sbin/tune2fs", "-l", device, NULL);
+  if (r == -1) {
+    reply_with_error ("tune2fs: %s", err);
+    free (err);
+    free (out);
+    return NULL;
+  }
+  free (err);
+
+  p = out;
+
+  /* Discard the first line if it contains "tune2fs ...". */
+  if (strncmp (p, "tune2fs ", 8) == 0) {
+    p = strchr (p, '\n');
+    if (p) p++;
+    else {
+      reply_with_error ("tune2fs: truncated output");
+      free (out);
+      return NULL;
+    }
+  }
+
+  /* Read the lines and split into "key: value". */
+  while (*p) {
+    pend = strchrnul (p, '\n');
+    if (*pend == '\n') {
+      *pend = '\0';
+      pend++;
+    }
+
+    if (!*p) continue;
+
+    colon = strchr (p, ':');
+    if (colon) {
+      *colon = '\0';
+
+      do { colon++; } while (*colon && isspace (*colon));
+
+      if (add_string (&ret, &size, &alloc, p) == -1) {
+	free (out);
+	return NULL;
+      }
+      if (strcmp (colon, "<none>") == 0 ||
+	  strcmp (colon, "<not available>") == 0 ||
+	  strcmp (colon, "(none)") == 0) {
+	if (add_string (&ret, &size, &alloc, "") == -1) {
+	  free (out);
+	  return NULL;
+	}
+      } else {
+	if (add_string (&ret, &size, &alloc, colon) == -1) {
+	  free (out);
+	  return NULL;
+	}
+      }
+    }
+    else {
+      if (add_string (&ret, &size, &alloc, p) == -1) {
+	free (out);
+	return NULL;
+      }
+      if (add_string (&ret, &size, &alloc, "") == -1) {
+	free (out);
+	return NULL;
+      }
+    }
+
+    p = pend;
+  }
+
+  free (out);
+
+  if (add_string (&ret, &size, &alloc, NULL) == -1)
+    return NULL;
+
+  return ret;
+}
+
+int
+do_set_e2label (const char *device, const char *label)
+{
+  int r;
+  char *err;
+
+  r = command (NULL, &err, "/sbin/e2label", device, label, NULL);
+  if (r == -1) {
+    reply_with_error ("e2label: %s", err);
+    free (err);
+    return -1;
+  }
+
+  free (err);
+  return 0;
+}
+
+char *
+do_get_e2label (const char *device)
+{
+  int r, len;
+  char *out, *err;
+
+  r = command (&out, &err, "/sbin/e2label", device, NULL);
+  if (r == -1) {
+    reply_with_error ("e2label: %s", err);
+    free (out);
+    free (err);
+    return NULL;
+  }
+
+  free (err);
+
+  /* Remove any trailing \n from the label. */
+  len = strlen (out);
+  if (len > 0 && out[len-1] == '\n')
+    out[len-1] = '\0';
+
+  return out;			/* caller frees */
+}
+
+int
+do_set_e2uuid (const char *device, const char *uuid)
+{
+  int r;
+  char *err;
+
+  r = command (NULL, &err, "/sbin/tune2fs", "-U", uuid, device, NULL);
+  if (r == -1) {
+    reply_with_error ("tune2fs -U: %s", err);
+    free (err);
+    return -1;
+  }
+
+  free (err);
+  return 0;
+}
+
+char *
+do_get_e2uuid (const char *device)
+{
+  int r;
+  char *out, *err, *p, *q;
+
+  /* It's not so straightforward to get the volume UUID.  We have
+   * to use tune2fs -l and then look for a particular string in
+   * the output.
+   */
+
+  r = command (&out, &err, "/sbin/tune2fs", "-l", device, NULL);
+  if (r == -1) {
+    reply_with_error ("tune2fs -l: %s", err);
+    free (out);
+    free (err);
+    return NULL;
+  }
+
+  free (err);
+
+  /* Look for /\nFilesystem UUID:\s+/ in the output. */
+  p = strstr (out, "\nFilesystem UUID:");
+  if (p == NULL) {
+    reply_with_error ("no Filesystem UUID in the output of tune2fs -l");
+    free (out);
+    return NULL;
+  }
+
+  p += 17;
+  while (*p && isspace (*p))
+    p++;
+  if (!*p) {
+    reply_with_error ("malformed Filesystem UUID in the output of tune2fs -l");
+    free (out);
+    return NULL;
+  }
+
+  /* Now 'p' hopefully points to the start of the UUID. */
+  q = p;
+  while (*q && (isxdigit (*q) || *q == '-'))
+    q++;
+  if (!*q) {
+    reply_with_error ("malformed Filesystem UUID in the output of tune2fs -l");
+    free (out);
+    return NULL;
+  }
+
+  *q = '\0';
+
+  p = strdup (p);
+  if (!p) {
+    reply_with_perror ("strdup");
+    free (out);
+    return NULL;
+  }
+
+  free (out);
+  return p;			/* caller frees */
+}