cli: volume status enhancement

    * Support "gluster volume status (all)" option to display all
      volumes' status.

    * On option "detail" appended to "gluster volume status *",
      amount of storage free, total storage, and backend filesystem
      details like inode size, inode count, free inodes, fs type,
      device name of each brick is displayed.

    * One can also obtain [detailed]status of only one brick.

    * Format of the enhanced volume status command is:
      "gluster volume status [all|<vol>] [<brick>] [detail]"

    * Some generic functions have been added to common-utils:

           skipword
           get_nth_word
      These functions enable parsing and fetching
      of words in a sentence.

           glusterd_get_brick_root    (in glusterd)
      These are self explanatory.

Change-Id: I6f40c1e19810f8504cd3b1786207364053d82e28
BUG: 765464
Signed-off-by: Rajesh Amaravathi <rajesh@redhat.com>
Reviewed-on: http://review.gluster.com/777
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amar@gluster.com>

2 files changed, 57 insertions, 0 deletions

diff --git a/libglusterfs/src/common-utils.c b/libglusterfs/src/common-utils.c
index 1d0fb822fc5..d22ebd2ef04 100644
--- a/libglusterfs/src/common-utils.c
+++ b/libglusterfs/src/common-utils.c
@@ -1607,6 +1607,55 @@ nwstrtail (char *str, char *pattern)
         return *pattern ? NULL : str;
 }
 
+void
+skipword (char **s)
+{
+        if (!*s)
+                return;
+
+        skipwhite (s);
+
+        while (!isspace(**s))
+                (*s)++;
+}
+
+char *
+get_nth_word (const char *str, int n)
+{
+        char           buf[4096] = {0};
+        char          *start     = NULL;
+        char          *word      = NULL;
+        int            i         = 0;
+        int            word_len  = 0;
+        const char    *end       = NULL;
+
+        if (!str)
+                goto out;
+
+        snprintf (buf, sizeof (buf), "%s", str);
+        start = buf;
+
+        for (i = 0; i < n-1; i++)
+                skipword (&start);
+
+        skipwhite (&start);
+        end = strpbrk ((const char *)start, " \t\n\0");
+
+        if (!end)
+                goto out;
+
+        word_len = abs (end - start);
+
+        word = GF_CALLOC (1, word_len + 1, gf_common_mt_strdup);
+        if (!word)
+                goto out;
+
+        strncpy (word, start, word_len);
+        *(word + word_len) = '\0';
+ out:
+        return word;
+}
+
 /* RFC 1123 & 952 */
 char
 valid_host_name (char *address, int length)
diff --git a/libglusterfs/src/common-utils.h b/libglusterfs/src/common-utils.h
index 4cb3843d980..6045cd3efe0 100644
--- a/libglusterfs/src/common-utils.h
+++ b/libglusterfs/src/common-utils.h
@@ -74,6 +74,11 @@ void trap (void);
 
 #define WIPE(statp) do { typeof(*statp) z = {0,}; if (statp) *statp = z; } while (0)
 
+#define IS_EXT_FS(fs_name)          \
+        (!strcmp (fs_name, "ext2") || \
+         !strcmp (fs_name, "ext3") || \
+         !strcmp (fs_name, "ext4"))
+
 enum _gf_boolean
 {
 	_gf_false = 0,
@@ -409,6 +414,9 @@ int get_checksum_for_path (char *path, uint32_t *checksum);
 char *strtail (char *str, const char *pattern);
 void skipwhite (char **s);
 char *nwstrtail (char *str, char *pattern);
+void skip_word (char **str);
+/* returns a new string with nth word of given string. n>=1 */
+char *get_nth_word (const char *str, int n);
 
 char valid_host_name (char *address, int length);
 char valid_ipv4_address (char *address, int length);