[Libguestfs] [PATCH] NEW API: add blkid command to print the attributes of the device

[Wanlong Gao]

A NEW API blkid.
It can print the device attributes.
Use it after list-devices, we can list ower devices and the attributes
of each device.
Use it like:
blkid <device>
It's should be a usefull function, and needed no test case for it.

Signed-off-by: Wanlong Gao <gaowanlong at cn.fujitsu.com>
---
 daemon/blkid.c                 |   75 ++++++++++++++++++++++++++++++++++++++++
 generator/generator_actions.ml |   73 ++++++++++++++++++++++++++++++++++++++
 src/MAX_PROC_NR                |    2 +-
 3 files changed, 149 insertions(+), 1 deletions(-)

diff --git a/daemon/blkid.c b/daemon/blkid.c
index 6d395c1..a7fd6bc 100644
--- a/daemon/blkid.c
+++ b/daemon/blkid.c
@@ -83,3 +83,78 @@ do_vfs_uuid (const char *device)
 {
   return get_blkid_tag (device, "UUID");
 }
+
+char **
+do_blkid(const char *device)
+{
+  int r;
+  char *out = NULL, *err = NULL;
+  char **lines = NULL;
+
+  char **ret = NULL;
+  int size = 0, alloc = 0;
+
+  const char *blkid[] = {"blkid", "-p", "-i", "-o", "export", device, NULL};
+  r = commandv(&out, &err, blkid);
+  if (r == -1) {
+    reply_with_error("%s", err);
+    goto error;
+  }
+
+  /* Split the command output into lines */
+  lines = split_lines(out);
+  if (lines == NULL) {
+    reply_with_perror("malloc");
+    goto error;
+  }
+
+  /* Parse the output of blkid -p -i -o export:
+   * UUID=b6d83437-c6b4-4bf0-8381-ef3fc3578590
+   * VERSION=1.0
+   * TYPE=ext2
+   * USAGE=filesystem
+   * MINIMUM_IO_SIZE=512
+   * PHYSICAL_SECTOR_SIZE=512
+   * LOGICAL_SECTOR_SIZE=512
+   * PART_ENTRY_SCHEME=dos
+   * PART_ENTRY_TYPE=0x83
+   * PART_ENTRY_NUMBER=6
+   * PART_ENTRY_OFFSET=642875153
+   * PART_ENTRY_SIZE=104857600
+   * PART_ENTRY_DISK=8:0
+   */
+  for (char **i = lines; *i != NULL; i++) {
+    char *line = *i;
+
+    /* Skip blank lines (shouldn't happen) */
+    if (line[0] == '\0') continue;
+
+    /* Split the line in 2 at the equals sign */
+    char *eq = strchr(line, '=');
+    if (eq) {
+      *eq = '\0'; eq++;
+
+      /* Add the key/value pair to the output */
+      if (add_string(&ret, &size, &alloc, line) == -1 ||
+          add_string(&ret, &size, &alloc, eq) == -1) goto error;
+    } else {
+      fprintf(stderr, "blkid: unexpected blkid output ignored: %s", line);
+    }
+  }
+
+  free(out);
+  free(err);
+  free(lines);
+
+  if (add_string(&ret, &size, &alloc, NULL) == -1) return NULL;
+
+  return ret;
+
+error:
+  free(out);
+  free(err);
+  if (lines) free(lines);
+  if (ret) free_strings(ret);
+
+  return NULL;
+}
diff --git a/generator/generator_actions.ml b/generator/generator_actions.ml
index 0e39e2f..d624f9b 100644
--- a/generator/generator_actions.ml
+++ b/generator/generator_actions.ml
@@ -6538,6 +6538,79 @@ The name of the MD device.
 This command deactivates the MD array named C<md>.  The
 device is stopped, but it is not destroyed or zeroed.");
 
+  ("blkid", (RHashtable "info", [Device "device"], []), 303, [],
+   [],
+   "print block device attributes",
+   "\
+This command exposes the output of 'blkid -p -i -o export <device>'. The following
+fields are usually present in the returned hash. Other fields may also be present.
+
+C<device> should be a block device or patition, for example C</dev/sda> or C</dev/sdb1>.
+
+=over
+
+=item C<UUID>
+
+The uuid of this device.
+
+=item C<UUID_SUB>
+
+The sub uuid of this device.
+
+=item C<LABEL>
+
+The label of this device.
+
+=item C<VERSION>
+
+The version of blkid command.
+
+=item C<TYPE>
+
+The filesystem type or RAID of this device.
+
+=item C<USAGE>
+
+The usage of this device, for example C<filesystem> or C<raid>.
+
+=item C<MINIMUM_IO_SIZE>
+
+The minimum io size of this device.
+
+=item C<PHYSICAL_SECTOR_SIZE>
+
+The pyhsical sector size of this device.
+
+=item C<LOGICAL_SECTOR_SIZE>
+
+The logical sector size of this device.
+
+=item C<PART_ENTRY_SCHEME>
+
+The scheme entry of this partition(only presented when it's a partition).
+
+=item C<PART_ENTRY_TYPE>
+
+The device type of this partition(only presented when it's a partition).
+
+=item C<PART_ENTRY_NUMBER>
+
+The partition number(only presented when it's a partition).
+
+=item C<PART_ENTRY_OFFSET>
+
+This partition's offset(only presented when it's a partition).
+
+=item C<PART_ENTRY_SIZE>
+
+The size of this partition(only presented when it's a partition).
+
+=item C<PART_ENTRY_DISK>
+
+The major:minor number of this partition(only presented when it's a partition).
+
+=back");
+
 ]
 
 let all_functions = non_daemon_functions @ daemon_functions
diff --git a/src/MAX_PROC_NR b/src/MAX_PROC_NR
index 274f714..8160622 100644
--- a/src/MAX_PROC_NR
+++ b/src/MAX_PROC_NR
@@ -1 +1 @@
-302
+303
-- 
1.7.8.rc4