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[v2,09/14] git-p4: fix freezing while waiting for fast-import progress

Message ID 20191213235247.23660-11-yang.zhao@skyboxlabs.com (mailing list archive)
State New, archived
Headers show
Series [v2,01/14] git-p4: make python2.7 the oldest supported version | expand

Commit Message

Yang Zhao Dec. 13, 2019, 11:52 p.m. UTC
As part of its importing process, git-p4 sends a `checkpoint` followed
immediately by `progress` to fast-import to force synchronization.
Due to buffering, it is possible for the `progress` command to not be
flushed before git-p4 begins to wait for the corresponding response.
This causes the script to freeze completely, and is consistently
observable at least on python-3.6.9.

Make sure this command sequence is completely flushed before waiting.

Signed-off-by: Yang Zhao <yang.zhao@skyboxlabs.com>
Reviewed-by: Ben Keene <seraphire@gmail.com>
 git-p4.py | 1 +
 1 file changed, 1 insertion(+)
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diff --git a/git-p4.py b/git-p4.py
index c7170c9ae6..68f9f4fdc6 100755
--- a/git-p4.py
+++ b/git-p4.py
@@ -2641,6 +2641,7 @@  def __init__(self):
     def checkpoint(self):
         self.gitStream.write("progress checkpoint\n\n")
+        self.gitStream.flush()
         out = self.gitOutput.readline()
         if self.verbose:
             print("checkpoint finished: " + out)