X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=daemon%2Fparted.c;h=b9b138e3d02acd417882ca977ebff3611cfb7f89;hp=9c65570f47ee46415a74693fcddc6bb72173b488;hb=5ce759bfdc70c97121ef34ab4d5c918d568f2474;hpb=b68c030adfdbefe65bc9ecdd673844c01bddb32a;ds=sidebyside

diff --git a/daemon/parted.c b/daemon/parted.c
index 9c65570..b9b138e 100644
--- a/daemon/parted.c
+++ b/daemon/parted.c
@@ -1,5 +1,5 @@
 /* libguestfs - the guestfsd daemon
- * Copyright (C) 2009 Red Hat Inc.
+ * Copyright (C) 2009-2011 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
@@ -161,6 +161,11 @@ do_part_add (const char *device, const char *prlogex,
 int
 do_part_del (const char *device, int partnum)
 {
+  if (partnum <= 0) {
+    reply_with_error ("partition number must be >= 1");
+    return -1;
+  }
+
   char partnum_str[16];
   snprintf (partnum_str, sizeof partnum_str, "%d", partnum);
 
@@ -173,27 +178,21 @@ do_part_del (const char *device, int partnum)
 int
 do_part_disk (const char *device, const char *parttype)
 {
-  const char *startstr;
-  const char *endstr;
-
   parttype = check_parttype (parttype);
   if (!parttype) {
     reply_with_error ("unknown partition type: common choices are \"gpt\" and \"msdos\"");
     return -1;
   }
 
-  /* Voooooodooooooooo (thanks Jim Meyering for working this out). */
-  if (STREQ (parttype, "msdos")) {
-    startstr = "1s";
-    endstr = "-1s";
-  } else if (STREQ (parttype, "gpt")) {
-    startstr = "34s";
-    endstr = "-34s";
-  } else {
-    /* untested */
-    startstr = "1s";
-    endstr = "-1s";
-  }
+  /* Align all partitions created this way to 64 sectors, and leave
+   * the last 64 sectors at the end of the disk free.  This wastes
+   * 32K+32K = 64K on 512-byte sector disks.  The rationale is:
+   *
+   * - aligned operations are faster
+   * - GPT requires at least 34 sectors at the end of the disk.
+   */
+  const char *startstr = "64s";
+  const char *endstr = "-64s";
 
   RUN_PARTED (return -1,
               device,
@@ -210,6 +209,11 @@ do_part_disk (const char *device, const char *parttype)
 int
 do_part_set_bootable (const char *device, int partnum, int bootable)
 {
+  if (partnum <= 0) {
+    reply_with_error ("partition number must be >= 1");
+    return -1;
+  }
+
   char partstr[16];
 
   snprintf (partstr, sizeof partstr, "%d", partnum);
@@ -225,6 +229,11 @@ do_part_set_bootable (const char *device, int partnum, int bootable)
 int
 do_part_set_name (const char *device, int partnum, const char *name)
 {
+  if (partnum <= 0) {
+    reply_with_error ("partition number must be >= 1");
+    return -1;
+  }
+
   char partstr[16];
 
   snprintf (partstr, sizeof partstr, "%d", partnum);
@@ -237,8 +246,7 @@ do_part_set_name (const char *device, int partnum, const char *name)
 }
 
 /* Return the nth field from a string of ':'/';'-delimited strings.
- * Useful for parsing the return value from print_partition_table
- * function below.
+ * Useful for parsing the return value from 'parted -m'.
  */
 static char *
 get_table_field (const char *line, int n)
@@ -266,16 +274,47 @@ get_table_field (const char *line, int n)
   return q;
 }
 
-static char **
-print_partition_table (const char *device)
+/* RHEL 5 parted doesn't have the -m (machine readable) option so we
+ * must do a lot more work to parse the output in
+ * print_partition_table below.  Test for this option the first time
+ * this function is called.
+ */
+static int
+test_parted_m_opt (void)
+{
+  static int result = -1;
+
+  if (result >= 0)
+    return result;
+
+  char *err = NULL;
+  int r = commandr (NULL, &err, "parted", "-s", "-m", "/dev/null", NULL);
+  if (r == -1) {
+    /* Test failed, eg. missing or completely unusable parted binary. */
+    reply_with_error ("could not run 'parted' command");
+    return -1;
+  }
+
+  if (err && strstr (err, "invalid option -- m"))
+    return result = 0;
+
+  return result = 1;
+}
+
+static char *
+print_partition_table (const char *device, int parted_has_m_opt)
 {
   char *out, *err;
   int r;
-  char **lines;
 
-  r = command (&out, &err, "parted", "-m", "--", device,
-               "unit", "b",
-               "print", NULL);
+  if (parted_has_m_opt)
+    r = command (&out, &err, "parted", "-m", "--", device,
+                 "unit", "b",
+                 "print", NULL);
+  else
+    r = command (&out, &err, "parted", "-s", "--", device,
+                 "unit", "b",
+                 "print", NULL);
   if (r == -1) {
     reply_with_error ("parted print: %s: %s", device,
                       /* Hack for parted 1.x which sends errors to stdout. */
@@ -286,89 +325,210 @@ print_partition_table (const char *device)
   }
   free (err);
 
-  lines = split_lines (out);
-  free (out);
+  return out;
+}
 
-  if (!lines)
+char *
+do_part_get_parttype (const char *device)
+{
+  int parted_has_m_opt = test_parted_m_opt ();
+  if (parted_has_m_opt == -1)
     return NULL;
 
-  if (lines[0] == NULL || STRNEQ (lines[0], "BYT;")) {
-    reply_with_error ("unknown signature, expected \"BYT;\" as first line of the output: %s",
-                      lines[0] ? lines[0] : "(signature was null)");
-    free_strings (lines);
+  char *out = print_partition_table (device, parted_has_m_opt);
+  if (!out)
     return NULL;
-  }
 
-  if (lines[1] == NULL) {
-    reply_with_error ("parted didn't return a line describing the device");
-    free_strings (lines);
-    return NULL;
-  }
+  if (parted_has_m_opt) {
+    /* New-style parsing using the "machine-readable" format from
+     * 'parted -m'.
+     */
+    char **lines = split_lines (out);
+    free (out);
 
-  return lines;
-}
+    if (!lines)
+      return NULL;
 
-char *
-do_part_get_parttype (const char *device)
-{
-  char **lines = print_partition_table (device);
-  if (!lines)
-    return NULL;
+    if (lines[0] == NULL || STRNEQ (lines[0], "BYT;")) {
+      reply_with_error ("unknown signature, expected \"BYT;\" as first line of the output: %s",
+                        lines[0] ? lines[0] : "(signature was null)");
+      free_strings (lines);
+      return NULL;
+    }
+
+    if (lines[1] == NULL) {
+      reply_with_error ("parted didn't return a line describing the device");
+      free_strings (lines);
+      return NULL;
+    }
+
+    /* lines[1] is something like:
+     * "/dev/sda:1953525168s:scsi:512:512:msdos:ATA Hitachi HDT72101;"
+     */
+    char *r = get_table_field (lines[1], 5);
+    if (r == NULL) {
+      free_strings (lines);
+      return NULL;
+    }
 
-  /* lines[1] is something like:
-   * "/dev/sda:1953525168s:scsi:512:512:msdos:ATA Hitachi HDT72101;"
-   */
-  char *r = get_table_field (lines[1], 5);
-  if (r == NULL) {
     free_strings (lines);
-    return NULL;
+
+    /* If "loop" return an error (RHBZ#634246). */
+    if (STREQ (r, "loop")) {
+      free (r);
+      reply_with_error ("not a partitioned device");
+      return NULL;
+    }
+
+    return r;
   }
+  else {
+    /* Old-style.  Look for "\nPartition Table: <str>\n". */
+    char *p = strstr (out, "\nPartition Table: ");
+    if (!p) {
+      reply_with_error ("parted didn't return Partition Table line");
+      free (out);
+      return NULL;
+    }
 
-  free_strings (lines);
+    p += 18;
+    char *q = strchr (p, '\n');
+    if (!q) {
+      reply_with_error ("parted Partition Table has no end of line char");
+      free (out);
+      return NULL;
+    }
 
-  return r;
+    *q = '\0';
+
+    p = strdup (p);
+    free (out);
+    if (!p) {
+      reply_with_perror ("strdup");
+      return NULL;
+    }
+
+    /* If "loop" return an error (RHBZ#634246). */
+    if (STREQ (p, "loop")) {
+      free (p);
+      reply_with_error ("not a partitioned device");
+      return NULL;
+    }
+
+    return p;                   /* caller frees */
+  }
 }
 
 guestfs_int_partition_list *
 do_part_list (const char *device)
 {
-  char **lines;
-  size_t row, nr_rows, i;
-  guestfs_int_partition_list *r;
+  int parted_has_m_opt = test_parted_m_opt ();
+  if (parted_has_m_opt == -1)
+    return NULL;
+
+  char *out = print_partition_table (device, parted_has_m_opt);
+  if (!out)
+    return NULL;
+
+  char **lines = split_lines (out);
+  free (out);
 
-  lines = print_partition_table (device);
   if (!lines)
     return NULL;
 
-  /* lines[0] is "BYT;", lines[1] is the device line which we ignore,
-   * lines[2..] are the partitions themselves.  Count how many.
-   */
-  nr_rows = 0;
-  for (row = 2; lines[row] != NULL; ++row)
-    ++nr_rows;
-
-  r = malloc (sizeof *r);
-  if (r == NULL) {
-    reply_with_perror ("malloc");
-    goto error1;
-  }
-  r->guestfs_int_partition_list_len = nr_rows;
-  r->guestfs_int_partition_list_val =
-    malloc (nr_rows * sizeof (guestfs_int_partition));
-  if (r->guestfs_int_partition_list_val == NULL) {
-    reply_with_perror ("malloc");
-    goto error2;
+  guestfs_int_partition_list *r;
+
+  if (parted_has_m_opt) {
+    /* New-style parsing using the "machine-readable" format from
+     * 'parted -m'.
+     *
+     * lines[0] is "BYT;", lines[1] is the device line which we ignore,
+     * lines[2..] are the partitions themselves.  Count how many.
+     */
+    size_t nr_rows = 0, row;
+    for (row = 2; lines[row] != NULL; ++row)
+      ++nr_rows;
+
+    r = malloc (sizeof *r);
+    if (r == NULL) {
+      reply_with_perror ("malloc");
+      goto error1;
+    }
+    r->guestfs_int_partition_list_len = nr_rows;
+    r->guestfs_int_partition_list_val =
+      malloc (nr_rows * sizeof (guestfs_int_partition));
+    if (r->guestfs_int_partition_list_val == NULL) {
+      reply_with_perror ("malloc");
+      goto error2;
+    }
+
+    /* Now parse the lines. */
+    size_t i;
+    for (i = 0, row = 2; lines[row] != NULL; ++i, ++row) {
+      if (sscanf (lines[row], "%d:%" SCNi64 "B:%" SCNi64 "B:%" SCNi64 "B",
+                  &r->guestfs_int_partition_list_val[i].part_num,
+                  &r->guestfs_int_partition_list_val[i].part_start,
+                  &r->guestfs_int_partition_list_val[i].part_end,
+                  &r->guestfs_int_partition_list_val[i].part_size) != 4) {
+        reply_with_error ("could not parse row from output of parted print command: %s", lines[row]);
+        goto error3;
+      }
+    }
   }
+  else {
+    /* Old-style.  Start at the line following "^Number", up to the
+     * next blank line.
+     */
+    size_t start = 0, end = 0, row;
+
+    for (row = 0; lines[row] != NULL; ++row)
+      if (STRPREFIX (lines[row], "Number")) {
+        start = row+1;
+        break;
+      }
+
+    if (start == 0) {
+      reply_with_error ("parted output has no \"Number\" line");
+      goto error1;
+    }
+
+    for (row = start; lines[row] != NULL; ++row)
+      if (STREQ (lines[row], "")) {
+        end = row;
+        break;
+      }
 
-  /* Now parse the lines. */
-  for (i = 0, row = 2; lines[row] != NULL; ++i, ++row) {
-    if (sscanf (lines[row], "%d:%" SCNi64 "B:%" SCNi64 "B:%" SCNi64 "B",
-                &r->guestfs_int_partition_list_val[i].part_num,
-                &r->guestfs_int_partition_list_val[i].part_start,
-                &r->guestfs_int_partition_list_val[i].part_end,
-                &r->guestfs_int_partition_list_val[i].part_size) != 4) {
-      reply_with_error ("could not parse row from output of parted print command: %s", lines[row]);
-      goto error3;
+    if (end == 0) {
+      reply_with_error ("parted output has no blank after end of table");
+      goto error1;
+    }
+
+    size_t nr_rows = end - start;
+
+    r = malloc (sizeof *r);
+    if (r == NULL) {
+      reply_with_perror ("malloc");
+      goto error1;
+    }
+    r->guestfs_int_partition_list_len = nr_rows;
+    r->guestfs_int_partition_list_val =
+      malloc (nr_rows * sizeof (guestfs_int_partition));
+    if (r->guestfs_int_partition_list_val == NULL) {
+      reply_with_perror ("malloc");
+      goto error2;
+    }
+
+    /* Now parse the lines. */
+    size_t i;
+    for (i = 0, row = start; row < end; ++i, ++row) {
+      if (sscanf (lines[row], " %d %" SCNi64 "B %" SCNi64 "B %" SCNi64 "B",
+                  &r->guestfs_int_partition_list_val[i].part_num,
+                  &r->guestfs_int_partition_list_val[i].part_start,
+                  &r->guestfs_int_partition_list_val[i].part_end,
+                  &r->guestfs_int_partition_list_val[i].part_size) != 4) {
+        reply_with_error ("could not parse row from output of parted print command: %s", lines[row]);
+        goto error3;
+      }
     }
   }
 
@@ -387,29 +547,93 @@ do_part_list (const char *device)
 int
 do_part_get_bootable (const char *device, int partnum)
 {
-  char **lines = print_partition_table (device);
-  if (!lines)
+  if (partnum <= 0) {
+    reply_with_error ("partition number must be >= 1");
     return -1;
+  }
 
-  /* We want lines[1+partnum]. */
-  if (count_strings (lines) < 1+partnum) {
-    reply_with_error ("partition number out of range: %d", partnum);
-    free_strings (lines);
+  int parted_has_m_opt = test_parted_m_opt ();
+  if (parted_has_m_opt == -1)
     return -1;
-  }
 
-  char *boot = get_table_field (lines[1+partnum], 6);
-  if (boot == NULL) {
-    free_strings (lines);
+  char *out = print_partition_table (device, parted_has_m_opt);
+  if (!out)
     return -1;
-  }
 
-  int r = STREQ (boot, "boot");
+  char **lines = split_lines (out);
+  free (out);
 
-  free (boot);
-  free_strings (lines);
+  if (!lines)
+    return -1;
 
-  return r;
+  if (parted_has_m_opt) {
+    /* New-style parsing using the "machine-readable" format from
+     * 'parted -m'.
+     *
+     * We want lines[1+partnum].
+     */
+    if (count_strings (lines) < (size_t) 1+partnum) {
+      reply_with_error ("partition number out of range: %d", partnum);
+      free_strings (lines);
+      return -1;
+    }
+
+    char *boot = get_table_field (lines[1+partnum], 6);
+    if (boot == NULL) {
+      free_strings (lines);
+      return -1;
+    }
+
+    int r = STREQ (boot, "boot");
+
+    free (boot);
+    free_strings (lines);
+
+    return r;
+  }
+  else {
+    /* Old-style: First look for the line matching "^Number". */
+    size_t start = 0, header, row;
+
+    for (row = 0; lines[row] != NULL; ++row)
+      if (STRPREFIX (lines[row], "Number")) {
+        start = row+1;
+        header = row;
+        break;
+      }
+
+    if (start == 0) {
+      reply_with_error ("parted output has no \"Number\" line");
+      free_strings (lines);
+      return -1;
+    }
+
+    /* Now we have to look at the column number of the "Flags" field.
+     * This is because parted's output has no way to represent a
+     * missing field except as whitespace, so we cannot just count
+     * fields from the left.  eg. The "File system" field is often
+     * missing in the output.
+     */
+    char *p = strstr (lines[header], "Flags");
+    if (!p) {
+      reply_with_error ("parted output has no \"Flags\" field");
+      free_strings (lines);
+      return -1;
+    }
+    size_t col = p - lines[header];
+
+    /* Look for the line corresponding to this partition number. */
+    row = start + partnum - 1;
+    if (row >= count_strings (lines) || !STRPREFIX (lines[row], " ")) {
+      reply_with_error ("partition number out of range: %d", partnum);
+      free_strings (lines);
+      return -1;
+    }
+
+    int r = STRPREFIX (&lines[row][col], "boot");
+    free_strings (lines);
+    return r;
+  }
 }
 
 /* Currently we use sfdisk for getting and setting the ID byte.  In
@@ -421,6 +645,11 @@ do_part_get_bootable (const char *device, int partnum)
 int
 do_part_get_mbr_id (const char *device, int partnum)
 {
+  if (partnum <= 0) {
+    reply_with_error ("partition number must be >= 1");
+    return -1;
+  }
+
   char partnum_str[16];
   snprintf (partnum_str, sizeof partnum_str, "%d", partnum);
 
@@ -452,6 +681,11 @@ do_part_get_mbr_id (const char *device, int partnum)
 int
 do_part_set_mbr_id (const char *device, int partnum, int idbyte)
 {
+  if (partnum <= 0) {
+    reply_with_error ("partition number must be >= 1");
+    return -1;
+  }
+
   char partnum_str[16];
   snprintf (partnum_str, sizeof partnum_str, "%d", partnum);