From: Junio C Hamano <gitster@pobox.com>
Date: Tue, 18 Sep 2007 04:18:20 +0000 (-0700)
Subject: send-email: make message-id generation a bit more robust
X-Git-Tag: v1.5.3.2~12
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/be510cfef3d8344007bd34128ca6eb799b714c8c?hp=be510cfef3d8344007bd34128ca6eb799b714c8c

send-email: make message-id generation a bit more robust

Earlier code took Unix time and appended a few random digits.
If you are firing off many messages within a second, you could
issue the same id to different messages, which is a no-no.  If
you send out 31 messages within a single second, with random
integer taken out of rand(4200), you have about 10% chance of
producing the same message ID.

This fixes the problem by uses a prefix string which is
constant-per-invocation (time and pid), with a serial number for
each message generated by the process appended at the end.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
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