[PATCH v4 3/4] git-p4: wrap patchRCSKeywords test to revert changes on failure

["Ben Keene via GitGitGadget" <gitgitgadget@gmail.com>]

From: Ben Keene <seraphire@gmail.com>

The patchRCSKeywords function has the potentional of throwing
an exception and this would leave files checked out in P4 and partially
modified.

Add a try-catch block around the patchRCSKeywords call and revert
the edited files in P4 before leaving the method.

Signed-off-by: Ben Keene <seraphire@gmail.com>
---
 git-p4.py | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/git-p4.py b/git-p4.py
index 9165ada2fd..03969052c8 100755
--- a/git-p4.py
+++ b/git-p4.py
@@ -1953,8 +1953,15 @@ def applyCommit(self, id):
                     # disable the read-only bit on windows.
                     if self.isWindows and file not in editedFiles:
                         os.chmod(file, stat.S_IWRITE)
-                    self.patchRCSKeywords(file, kwfiles[file])
-                    fixed_rcs_keywords = True
+                    
+                    try:
+                        self.patchRCSKeywords(file, kwfiles[file])
+                        fixed_rcs_keywords = True
+                    except:
+                        # We are throwing an exception, undo all open edits
+                        for f in editedFiles:
+                            p4_revert(f)
+                        raise
 
             if fixed_rcs_keywords:
                 print("Retrying the patch with RCS keywords cleaned up")
-- 
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