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Re: git-send-email creates duplicate Message-Id's

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From: Junio C Hamano <gitster@...>
To: Adrian Bunk <bunk@...>
Cc: Avi Kivity <avi@...>, <linux-kernel@...>, <git@...>
Subject: Re: git-send-email creates duplicate Message-Id's
Date: Monday, September 17, 2007 - 4:22 pm

Adrian Bunk <bunk@kernel.org> writes:


The old code generated rand(4200) for each message and appended
it to the timestamp.  I do not know where the original author
got 4200 from, but I think if you send many messages within a
single second it is possible to get collisions.

I guess something like this patch is an improvement?  It
generates a single prefix from timestamp and random, and appends
a number that is incremented for each message.

---
diff --git a/git-send-email.perl b/git-send-email.perl
index dd7560b..e250732 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -477,10 +477,18 @@ 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, int(rand(4200)));
+		$message_id_serial = 0;
+	}
+	$message_id_serial++;
+
+	$uniq = "$message_id_stamp-$message_id_serial";
+
 	my $du_part;
 	for ($sender, $repocommitter, $repoauthor) {
 		$du_part = extract_valid_address(sanitize_address($_));
@@ -490,8 +498,8 @@ 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
 }
 
-
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Messages in current thread:
[PATCH 000/104] KVM patch queue for the 2.6.24 merge window, Avi Kivity, (Mon Sep 17, 4:30 am)
git-send-email creates duplicate Message-Id's, Adrian Bunk, (Mon Sep 17, 11:59 am)
Re: git-send-email creates duplicate Message-Id's, Junio C Hamano, (Mon Sep 17, 4:22 pm)
Re: git-send-email creates duplicate Message-Id's, Matti Aarnio, (Mon Sep 17, 4:47 pm)
[PATCH 008/104] KVM: Trivial: Comment spelling may escape grep, Avi Kivity, (Mon Sep 17, 4:30 am)
[PATCH 011/104] KVM: Use standard CR3 flags, tighten checking, Avi Kivity, (Mon Sep 17, 4:30 am)
[PATCH 014/104] KVM: Set exit_reason to KVM_EXIT_MMIO where ..., Avi Kivity, (Mon Sep 17, 4:30 am)
[PATCH 012/104] KVM: Use standard CR4 flags, tighten checking, Avi Kivity, (Mon Sep 17, 4:30 am)
[PATCH 015/104] KVM: Use standard CR8 flags, and fix TPR def..., Avi Kivity, (Mon Sep 17, 4:30 am)
[PATCH 018/104] KVM: Return if the pdptrs are invalid when t..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 023/104] KVM: load_pdptrs() cleanups, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 021/104] KVM: VMX: Import some constants of vmcs from..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 016/104] KVM: x86 emulator: fix cmov for writeback ch..., Avi Kivity, (Mon Sep 17, 4:30 am)
[PATCH 026/104] KVM: VMX: Improve the method of writing vmcs..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 029/104] KVM: Convert vm lock to a mutex, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 035/104] KVM: Change the emulator_{read,write,cmpxchg..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 043/104] KVM: SVM: Make set_msr_interception more rel..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 024/104] KVM: Remove arch specific components from th..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 044/104] KVM: Remove redundant alloc_vmcs_cpu declara..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 028/104] KVM: Use the scheduler preemption notifiers ..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 036/104] KVM: Remove kvm_{read,write}_guest(), Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 046/104] KVM: Remove stat_set from debugfs, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 031/104] KVM: VMX: pass vcpu_vmx internally, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 050/104] KVM: VMX: Remove a duplicated ia32e mode vm ..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 055/104] KVM: Communicate cr8 changes to userspace, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 057/104] KVM: x86 emulator: implement 'jmp rel' instr..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 056/104] KVM: x86 emulator: implement 'and $imm, %{al..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 059/104] KVM: x86 emulator: implement 'push reg' (opc..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 052/104] KVM: Cleanup string I/O instruction emulation, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 062/104] KVM: X86 emulator: fix 'push reg' writeback, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 074/104] KVM: pending irq save/restore, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 082/104] KVM: Set the ET flag in CR0 after initializi..., Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 084/104] KVM: Clean up unloved invlpg emulation, Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 083/104] KVM: Remove the unused invlpg member of stru..., Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 081/104] KVM: enable in-kernel APIC INIT/SIPI handling, Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 085/104] KVM: Keep control regs in sync, Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 086/104] KVM: Hoist SVM's get_cs_db_l_bits into core ..., Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 091/104] KVM: Move main vcpu loop into subarch indepe..., Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 092/104] KVM: VMX: Fix exit qualification width on i386, Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 093/104] KVM: x86 emulator: push imm8, Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 094/104] KVM: x86 emulator: call near, Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 095/104] KVM: x86 emulator: pushf, Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 096/104] KVM: Improve emulation failure reporting, Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 097/104] KVM: x86 emulator: sort opcodes into ascendi..., Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 103/104] KVM: x86 emulator: popf, Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 099/104] KVM: X86 emulator: jump conditional short, Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 102/104] KVM: x86 emulator: fix src, dst value initia..., Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 088/104] KVM: Rename kvm_arch_ops to kvm_x86_ops, Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 098/104] KVM: x86 emulator: imlpement jump conditiona..., Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 100/104] KVM: x86 emulator: lea, Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 101/104] KVM: x86 emulator: jmp abs, Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 090/104] KVM: VMX: Move vm entry failure handling to ..., Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 087/104] KVM: Simplify memory allocation, Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 089/104] KVM: MMU: Don't do GFP_NOWAIT allocations, Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 080/104] KVM: round robin for APIC lowest priority de..., Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 076/104] KVM: Keep track of missed timer irq injections, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 079/104] KVM: deliver PIC interrupt only to vcpu0, Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 075/104] KVM: VMX: Use shadow TPR/cr8 for 64-bits gue..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 066/104] KVM: Emulate local APIC in kernel, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 078/104] KVM: disable tpr/cr8 sync when in-kernel API..., Avi Kivity, (Mon Sep 17, 4:32 am)
[PATCH 077/104] KVM: Migrate lapic hrtimer when vcpu moves t..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 061/104] KVM: Support more memory slots, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 063/104] KVM: VMX: Split segments reload in vmx_load_..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 060/104] KVM: VMX: allow rmode_tss_base() to work wit..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 072/104] KVM: in-kernel IOAPIC save and restore support, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 067/104] KVM: In-kernel I/O APIC model, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 073/104] KVM: in-kernel LAPIC save and restore support, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 064/104] KVM: Add support for in-kernel PIC emulation, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 070/104] KVM: Add get/set irqchip ioctls for in-kerne..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 071/104] KVM: Bypass irq_pending get/set when using i..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 068/104] KVM: Emulate hlt in the kernel, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 065/104] KVM: Define and use cr8 access functions, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 069/104] KVM: Protect in-kernel pio using kvm-&gt;lock, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 058/104] KVM: x86 emulator: Implement 'jmp rel short'..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 034/104] KVM: SVM: internal function name cleanup, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 025/104] KVM: Dynamically allocate vcpus, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 053/104] KVM: Clean up kvm_setup_pio(), Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 051/104] KVM: Remove useless assignment, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 048/104] KVM: Add and use pr_unimpl for standard form..., Avi Kivity, (Mon Sep 17, 4:31 am)
Re: [PATCH 048/104] KVM: Add and use pr_unimpl for standard ..., Joe Perches, (Mon Sep 17, 12:16 pm)
Re: [PATCH 048/104] KVM: Add and use pr_unimpl for standard ..., Rusty Russell, (Mon Sep 17, 7:08 pm)
[PATCH 049/104] KVM: Use kmem_cache_free for kmem_cache_zall..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 033/104] KVM: SVM: de-containization, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 047/104] KVM: Remove unneeded kvm_dev_open and kvm_de..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 045/104] KVM: Fix defined but not used warning in dri..., Avi Kivity, (Mon Sep 17, 4:31 am)
Re: [PATCH 045/104] KVM: Fix defined but not used warning in..., David Miller, (Mon Sep 17, 12:27 pm)
Re: [kvm-devel] [PATCH 045/104] KVM: Fix defined but not use..., Avi Kivity, (Mon Sep 17, 1:35 pm)
[PATCH 037/104] KVM: Use kmem cache for allocating vcpus, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 038/104] KVM: Use alignment properties of vcpu to sim..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 040/104] KVM: VMX: Add cpu consistency check, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 042/104] KVM: Cleanup mark_page_dirty, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 039/104] KVM: kvm_vm_ioctl_get_dirty_log restore "not..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 030/104] KVM: fx_init() needs preemption disabled whi..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 041/104] KVM: Don't assign vcpu-&gt;cr3 if it's inval..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 020/104] KVM: Move gfn_to_page out of kmap/unmap pairs, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 032/104] KVM: Remove three magic numbers, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 022/104] KVM: Remove dead code in the cmpxchg instruc..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 027/104] KVM: add hypercall nr to kvm_run, Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 019/104] KVM: Hoist kvm_mmu_reload() out of the criti..., Avi Kivity, (Mon Sep 17, 4:31 am)
[PATCH 017/104] KVM: x86 emulator: fix faulty check for two-..., Avi Kivity, (Mon Sep 17, 4:30 am)
[PATCH 010/104] KVM: Trivial: Use standard CR0 flags macros ..., Avi Kivity, (Mon Sep 17, 4:30 am)
[PATCH 013/104] KVM: Trivial: Use standard BITMAP macros, op..., Avi Kivity, (Mon Sep 17, 4:30 am)
[PATCH 009/104] KVM: Trivial: Avoid hardware_disable predecl..., Avi Kivity, (Mon Sep 17, 4:30 am)
[PATCH 006/104] KVM: Trivial: Remove unused struct cpu_user_..., Avi Kivity, (Mon Sep 17, 4:30 am)
[PATCH 007/104] KVM: Trivial: Make decode_register() static, Avi Kivity, (Mon Sep 17, 4:30 am)
[PATCH 005/104] KVM: Trivial: /dev/kvm interface is no longe..., Avi Kivity, (Mon Sep 17, 4:30 am)
[PATCH 004/104] KVM: In-kernel string pio write support, Avi Kivity, (Mon Sep 17, 4:30 am)
[PATCH 003/104] KVM: Future-proof the exit information union..., Avi Kivity, (Mon Sep 17, 4:30 am)
[PATCH 002/104] KVM: SMP: Add vcpu_id field in struct vcpu, Avi Kivity, (Mon Sep 17, 4:30 am)
[PATCH 001/104] KVM: Fix *nopage() in kvm_main.c, Avi Kivity, (Mon Sep 17, 4:30 am)
Re: [PATCH 001/104] KVM: Fix *nopage() in kvm_main.c, Christoph Hellwig, (Mon Sep 17, 5:13 am)
Re: [PATCH 001/104] KVM: Fix *nopage() in kvm_main.c, Avi Kivity, (Mon Sep 17, 5:15 am)
Re: [PATCH 001/104] KVM: Fix *nopage() in kvm_main.c, Avi Kivity, (Mon Sep 17, 5:18 am)
Re: [PATCH 001/104] KVM: Fix *nopage() in kvm_main.c, Nick Piggin, (Sun Sep 16, 5:29 pm)
Re: [PATCH 001/104] KVM: Fix *nopage() in kvm_main.c, Avi Kivity, (Mon Sep 17, 2:19 pm)
Re: [PATCH 001/104] KVM: Fix *nopage() in kvm_main.c, Nick Piggin, (Mon Sep 17, 1:17 pm)
Re: [PATCH 001/104] KVM: Fix *nopage() in kvm_main.c, Avi Kivity, (Tue Sep 18, 6:44 am)