[PATCH 1/1] git-p4: auto-delete named temporary file

From: Git Gadget <gitgitgadget@gmail.com>
Date: Aug 26, 2019, 13:51 UTC
Message-ID: <CANg4QoGSVQWG3QXzoiA8oDsjXaXGoZ+WMNLSPpu75eJWdrWxLQ@mail.gmail.com>
In-Reply-To: <pull.303.git.gitgitgadget@gmail.com>

From: "Philip.McGraw" <Philip.McGraw@bentley.com>

Take new approach using the NamedTemporaryFile() file-like object as input to the ZipFile() which auto-deletes after implicit close leaving with scope.

Original code produced double-open problems on Windows platform from using already open NamedTemporaryFile() generated filename instead of object.

Thanks to Andrey for patiently suggesting several iterations on this change for avoiding exceptions!

Also print error details after resulting IOError to make debugging cause of exception less mysterious when it has nothing to do with "git version recent enough."

Signed-off-by: Philip.McGraw <Philip.McGraw@bentley.com>
---
 git-p4.py | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/git-p4.py b/git-p4.py
index c71a6832e2..33bdb14fd1 100755
--- a/git-p4.py
+++ b/git-p4.py
@@ -1160,13 +1160,11 @@ def exceedsLargeFileThreshold(self, relPath, contents):
             if contentsSize <=
gitConfigInt('git-p4.largeFileCompressedThreshold'):
                 return False
             contentTempFile = self.generateTempFile(contents)
-            compressedContentFile =
tempfile.NamedTemporaryFile(prefix='git-p4-large-file', delete=False)
-            zf = zipfile.ZipFile(compressedContentFile.name, mode='w')
-            zf.write(contentTempFile, compress_type=zipfile.ZIP_DEFLATED)
-            zf.close()
-            compressedContentsSize = zf.infolist()[0].compress_size
+            compressedContentFile =
tempfile.NamedTemporaryFile(prefix='git-p4-large-file', delete=True)
+            with zipfile.ZipFile(compressedContentFile, mode='w') as zf:
+                zf.write(contentTempFile, compress_type=zipfile.ZIP_DEFLATED)
+                compressedContentsSize = zf.infolist()[0].compress_size
             os.remove(contentTempFile)
-            os.remove(compressedContentFile.name)
             if compressedContentsSize >
gitConfigInt('git-p4.largeFileCompressedThreshold'):
                 return True
         return False
@@ -3514,8 +3512,9 @@ def importHeadRevision(self, revision):
         self.updateOptionDict(details)
         try:
             self.commit(details,
self.extractFilesFromCommit(details), self.branch)
-        except IOError:
+        except IOError as err:
             print("IO error with git fast-import. Is your git version
recent enough?")
+            print("IO error details: {}".format(err))
             print(self.gitError.read())

     def openStreams(self):

--
gitgitgadget