common-utils: Added C wrapper to mkdir(1) -p functionality.

- Modified glusterd-rebalance to use mkdir_p C wrapper.

Change-Id: If9a00b8c0e00af644b9c3e64a5fc94cf6201827c
Signed-off-by: Krishnan Parthasarathi <kp@gluster.com>
Reviewed-on: http://review.gluster.com/3347
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>

2 files changed, 64 insertions, 0 deletions

diff --git a/libglusterfs/src/common-utils.c b/libglusterfs/src/common-utils.c
index 7e7eb4614..4b8807be1 100644
--- a/libglusterfs/src/common-utils.c
+++ b/libglusterfs/src/common-utils.c
@@ -58,6 +58,68 @@ struct dnscache6 {
 };
 
 
+/* works similar to mkdir(1) -p.
+ * @start returns the point in path from which components were created
+ * @start is -1 if the entire path existed before.
+ */
+int
+mkdir_p (char *path, mode_t mode, gf_boolean_t allow_symlinks, int *start)
+{
+        int             i               = 0;
+        int             ret             = -1;
+        char            dir[PATH_MAX]   = {0,};
+        struct stat     stbuf           = {0,};
+        int             created         = -1;
+
+        strcpy (dir, path);
+        i = (dir[0] == '/')? 1: 0;
+        do {
+                if (path[i] != '/' && path[i] != '\0')
+                        continue;
+
+                dir[i] = '\0';
+                ret = mkdir (dir, mode);
+                if (ret && errno != EEXIST) {
+                        gf_log ("", GF_LOG_ERROR, "Failed due to reason %s",
+                                strerror (errno));
+                        goto out;
+                }
+
+                if (ret && errno == EEXIST)
+                        created = i;
+
+                if (ret && errno == EEXIST && !allow_symlinks) {
+                        ret = lstat (dir, &stbuf);
+                        if (ret)
+                                goto out;
+
+                        if (S_ISLNK (stbuf.st_mode)) {
+                                ret = -1;
+                                gf_log ("", GF_LOG_ERROR, "%s is a symlink",
+                                        dir);
+                                goto out;
+                        }
+                }
+                dir[i] = '/';
+
+        } while (path[i++] != '\0');
+
+        ret = stat (dir, &stbuf);
+        if (ret || !S_ISDIR (stbuf.st_mode)) {
+                ret = -1;
+                gf_log ("", GF_LOG_ERROR, "Failed to create directory, "
+                        "possibly some of the components were not directories");
+                goto out;
+        }
+
+        ret = 0;
+        if (start)
+                *start = created;
+out:
+
+        return ret;
+}
+
 int
 log_base2 (unsigned long x)
 {
diff --git a/libglusterfs/src/common-utils.h b/libglusterfs/src/common-utils.h
index d58802912..69d57c8d4 100644
--- a/libglusterfs/src/common-utils.h
+++ b/libglusterfs/src/common-utils.h
@@ -392,6 +392,8 @@ memdup (const void *ptr, size_t size)
 	return newptr;
 }
 
+int
+mkdir_p (char *path, mode_t mode, gf_boolean_t allow_symlinks, int *start);
 /*
  * rounds up nr to power of two. If nr is already a power of two, just returns
  * nr