Go 开发团队技术 leader Russ Cox (rsc) 发文介绍了关于 Go 的版本控制历史。起因是每隔一段时间，总有人用下面这段代码表示 Go 的首次 commit 是在 1972 年：
% git log --reverse --stat
commit 7d7c6a97f815e9279d08cfaea7d5efb5e90695a8
Author: Brian Kernighan <bwk>
AuthorDate: Tue Jul 18 19:05:45 1972 -0500
Commit: Brian Kernighan <bwk>
CommitDate: Tue Jul 18 19:05:45 1972 -0500
hello, world
R=ken
DELTA=7(7 added, 0 deleted, 0 changed)
src/pkg/debug/macho/testdata/hello.b | 7 +++++++
1 file changed, 7 insertions(+)
...rsc 认为这种说法十分愚蠢，于是他揭秘了关于 Go 版本控制的更多有趣历史，比如 Go 真正的首次 commit 其实是第 5 个 commit，在此之前的是假 commit。
commit 18c5b488a3b2e218c0e0cf2a7d4820d9da93a554
Author: Robert Griesemer <[email protected]>
AuthorDate: Sun Mar 2 20:47:34 2008 -0800
Commit: Robert Griesemer <[email protected]>
CommitDate: Sun Mar 2 20:47:34 2008 -0800
Go spec starting point.
SVN=111041
doc/go_spec | 1197 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 1197 insertions(+)据介绍，Go 使用过的版本控制系统总共有 4 个：SVN、Perforce、Mercurial 和 Git。
SVN
Go 刚启动的时候使用 SVN 作为版本控制系统，据称这是因为谷歌希望通过此举评估在内部大规模推广 SVN 的可行性。最后的结果虽然没有选择 SVN，但上文提到的 Go 首次真正 commit 正是提交到了 SVN 服务器，可以说 SVN 见证了 Go 的诞生。
Perforce
2008 年 7 月，Go 在 SVN 提交了最后一次 commit，此后便转用 Perforce。
下面是 Go 迁移到 Perforce 的首次 commit：
commit 777ee7163bba96f2c9b3dfe135d8ad4ab837c062
Author: Rob Pike <[email protected]>
AuthorDate: Mon Jul 21 16:18:04 2008 -0700
Commit: Rob Pike <[email protected]>
CommitDate: Mon Jul 21 16:18:04 2008 -0700
map delete
SVN=128258
doc/go_lang.txt | 6 ++++++
1 file changed, 6 insertions(+)
commit 05caa7f82030327ccc9ae63a2b0121a029286501
Author: Rob Pike <[email protected]>
AuthorDate: Mon Jul 21 17:10:49 2008 -0700
Commit: Rob Pike <[email protected]>
CommitDate: Mon Jul 21 17:10:49 2008 -0700
help management of empty pkg and lib directories in perforce
R=gri
DELTA=4(4 added, 0 deleted, 0 changed)
OCL=13328
CL=13328
lib/place-holder| 2 ++
pkg/place-holder| 2 ++
src/cmd/gc/mksys.bash | 0
3 files changed, 4 insertions(+)迁移至 Perforce 后，可以看到引入了DELTA=, OCL= 和 CL= 这些标签。并且许多其他变更具有相同的OCL=和CL=，如下：
commit c1f5eda7a2465dae196d1fa10baf6bfa9253808a
Author: Rob Pike <[email protected]>
AuthorDate: Mon Jul 21 18:06:39 2008 -0700
Commit: Rob Pike <[email protected]>
CommitDate: Mon Jul 21 18:06:39 2008 -0700
change date
OCL=13331
CL=13331
doc/go_lang.txt | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)Go 在开源前的大部分开发工作都是在 Perforce 服务器上进行。
Mercurial
2009 年 10 月，Go 的版本控制系统开始切换至 Mercurial：
commit 942d6590d9005f89e971ed5af0374439a264a20e
Author: Kai Backman <[email protected]>
AuthorDate: Fri Oct 23 11:03:16 2009 -0700
Commit: Kai Backman <[email protected]>
CommitDate: Fri Oct 23 11:03:16 2009 -0700
one more argsize fix. we were copying with the correct
alignment but not enough (duh).
R=rsc
APPROVED=rsc
DELTA=16(13 added, 0 deleted, 3 changed)
OCL=36020
CL=36024
src/cmd/5g/ggen.c |2 +-
test/arm-pass.txt | 17 +++++++++++++++--
2 files changed, 16 insertions(+), 3 deletions(-)
commit b74fd8ecb17c1959bbf2dbba6ccb8bae6bfabeb8
Author: Kai Backman <[email protected]>
AuthorDate: Fri Oct 23 12:43:01 2009 -0700
Commit: Kai Backman <[email protected]>
CommitDate: Fri Oct 23 12:43:01 2009 -0700
fix build issue cause by transition to hg
R=rsc
http://go/go-review/1013012
src/make-arm.bash | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)这次的切换也是属于 11 月开源 Go 的准备工作的一部分，开发团队还需要将新的开源版权声明添加到每个文件中。rsc 表示这些工作花费了他大约一周的时间。
Git
从 2009 年 11 月到 2014 年底，由于 Google Code Project Hosting 即将关闭，Go 也不得不寻找新的代码托管方案。在研究了几个选项后，他们最终选择使用 Gerrit Code Review。许多人认为 Go 托管在 GitHub 上，但 GitHub 只是问题跟踪器的主要来源：源代码的官方主要副本位于 go.googlesource.com。
下面的 commit 见证了 Go 从 Mercurial 到 Git 的转换：
commit 94151eb2799809ece7e44ce3212aa3cbb9520849
Author: Russ Cox <[email protected]>
AuthorDate: Fri Dec 5 21:33:07 2014 -0500
Commit: Russ Cox <[email protected]>
CommitDate: Fri Dec 5 21:33:07 2014 -0500
encoding/xml: remove SyntaxError.Byte
It is unused. It was introduced in the CL that added InputOffset.
I suspect it was an editing mistake.
LGTM=bradfitz
R=bradfitz
CC=golang-codereviews
https://golang.org/cl/182580043
src/encoding/xml/xml.go | 1 -
1 file changed, 1 deletion(-)
commit 258f53dee33b9055ea168cb186f8c076edee5905
Author: David Symonds <[email protected]>
AuthorDate: Mon Dec 8 13:50:49 2014 +1100
Commit: David Symonds <[email protected]>
CommitDate: Mon Dec 8 13:50:49 2014 +1100
remove .hgtags.
.hgtags | 140 ----------------------------------------------------------------
1 file changed, 140 deletions(-)
commit 369873c6e5d00314ae30276363f58e5af11b149c
Author: David Symonds <[email protected]>
AuthorDate: Mon Dec 8 13:50:49 2014 +1100
Commit: David Symonds <[email protected]>
CommitDate: Mon Dec 8 13:50:49 2014 +1100
convert .hgignore to .gitignore.
.hgignore => .gitignore | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)
commit f33fc0eb95be84f0a688a62e25361a117e5b995b
Author: David Symonds <[email protected]>
AuthorDate: Mon Dec 8 13:53:11 2014 +1100
Commit: David Symonds <[email protected]>
CommitDate: Mon Dec 8 13:53:11 2014 +1100
cmd/dist: convert dist from Hg to Git.
src/cmd/dist/build.c | 100 ++++++++++++++++++++++++++++++---------------------
1 file changed, 59 insertions(+), 41 deletions(-)
commit 26399948e3402d3512cb14fe5901afaef54482fa
Author: David Symonds <[email protected]>
AuthorDate: Mon Dec 8 11:39:11 2014 +1100
Commit: David Symonds <[email protected]>
CommitDate: Mon Dec 8 04:42:22 2014 +0000
add bin/ to .gitignore.
Change-Id: I5c788d324e56ca88366fb54b67240cebf5dced2c
Reviewed-on: https://go-review.googlesource.com/1171
Reviewed-by: Andrew Gerrand <[email protected]>
.gitignore | 1 +
1 file changed, 1 insertion(+)