From be510cfef3d8344007bd34128ca6eb799b714c8c Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Mon, 17 Sep 2007 21:18:20 -0700 Subject: [PATCH] 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 --- git-send-email.perl | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/git-send-email.perl b/git-send-email.perl index 195fe6f70..9547cc37a 100755 --- a/git-send-email.perl +++ b/git-send-email.perl @@ -437,10 +437,17 @@ sub extract_valid_address { # We'll setup a template for the message id, using the "from" address: +my ($message_id_stamp, $message_id_serial); sub make_message_id { - my $date = time; - my $pseudo_rand = int (rand(4200)); + my $uniq; + if (!defined $message_id_stamp) { + $message_id_stamp = sprintf("%s-%s", time, $$); + $message_id_serial = 0; + } + $message_id_serial++; + $uniq = "$message_id_stamp-$message_id_serial"; + my $du_part; for ($sender, $repocommitter, $repoauthor) { $du_part = extract_valid_address(sanitize_address($_)); @@ -450,8 +457,8 @@ sub make_message_id use Sys::Hostname qw(); $du_part = 'user@' . Sys::Hostname::hostname(); } - my $message_id_template = "<%s-git-send-email-$du_part>"; - $message_id = sprintf $message_id_template, "$date$pseudo_rand"; + my $message_id_template = "<%s-git-send-email-%s>"; + $message_id = sprintf($message_id_template, $uniq, $du_part); #print "new message id = $message_id\n"; # Was useful for debugging } -- 2.26.2