From 5ba80d404cd6d5dc6d1ccfcfc5f8fc560d82be06 Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Tue, 4 May 2021 17:58:26 -0400 Subject: [PATCH] git_config: hoist Windows ssh check earlier The ssh master logic has never worked under Windows which is why this code always returned False when running there (including cygwin). But the OS check was still done while holding the threading lock. While it might be a little slower than necessary, it still worked. The switch from the threading module to the multiprocessing module changed global behavior subtly under Windows and broke things: the globals previously would stay valid, but now they get cleared. So the lock is reset to None in children workers. We could tweak the logic to pass the lock through, but there isn't much point when the rest of the code is still disabled in Windows. So perform the platform check before we grab the lock. This fixes the crash, and probably speeds things up a few nanoseconds. This shouldn't be a problem on Linux systems as the platform fork will duplicate the existing process memory (including globals). Bug: https://crbug.com/gerrit/14480 Change-Id: I1d1da82c6d7bd6b8cdc1f03f640a520ecd047063 Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/305149 Reviewed-by: Raman Tenneti Tested-by: Mike Frysinger --- git_config.py | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/git_config.py b/git_config.py index 914b2924..fcd0446c 100644 --- a/git_config.py +++ b/git_config.py @@ -459,6 +459,11 @@ def init_ssh(): def _open_ssh(host, port=None): global _ssh_master + # Bail before grabbing the lock if we already know that we aren't going to + # try creating new masters below. + if sys.platform in ('win32', 'cygwin'): + return False + # Acquire the lock. This is needed to prevent opening multiple masters for # the same host when we're running "repo sync -jN" (for N > 1) _and_ the # manifest specifies a different host from the @@ -476,11 +481,8 @@ def _open_ssh(host, port=None): if key in _master_keys: return True - if (not _ssh_master - or 'GIT_SSH' in os.environ - or sys.platform in ('win32', 'cygwin')): - # failed earlier, or cygwin ssh can't do this - # + if not _ssh_master or 'GIT_SSH' in os.environ: + # Failed earlier, so don't retry. return False # We will make two calls to ssh; this is the common part of both calls.