git-p4: Correct branch base depot path detection

When branch detection is enabled each branch is named in git after their
relative depot path in Perforce. To do this the depot paths are compared against
each other to find their common base path. The current algorithm makes this
comparison on a character by character basis.
Assuming we have the following branches:

  //depot/branches/featureA
  //depot/branches/featureB

Then the base depot path would be //depot/branches/feature, which is an invalid
depot path.

The current patch fixes this by splitting the path into a list and comparing the
list entries, making it choose correctly //depot/branches as the base path.

Signed-off-by: Vitor Antunes <vitor.hda@gmail.com>
Acked-by: Pete Wyckoff <pw@padd.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/contrib/fast-import/git-p4 b/contrib/fast-import/git-p4
index 0db3e72665ff85d4e284be4ad54f12b8500b2ac6..72a5b6c1830aef015ad1c371d365d593ffab4be0 100755 (executable)
--- a/contrib/fast-import/git-p4
+++ b/contrib/fast-import/git-p4
@@ -1829,12 +1829,14 @@ class P4Sync(Command, P4UserMap):
                     else:
                         paths = []
                         for (prev, cur) in zip(self.previousDepotPaths, depotPaths):
-                            for i in range(0, min(len(cur), len(prev))):
-                                if cur[i] <> prev[i]:
+                            prev_list = prev.split("/")
+                            cur_list = cur.split("/")
+                            for i in range(0, min(len(cur_list), len(prev_list))):
+                                if cur_list[i] <> prev_list[i]:
                                     i = i - 1
                                     break
 
-                            paths.append (cur[:i + 1])
+                            paths.append ("/".join(cur_list[:i + 1]))
 
                         self.previousDepotPaths = paths