Git 日志不显示子模块更改
我在 master 上有一个提交，哈希值 6877146，它更新了一个子模块。
$ git show 6877146
commit 6877146f1781bfbd4ec3ae2a27121a606f5f688e
Author: [snip]
Date: Wed Feb 22 16:10:20 2012 +0000
updating potatobase
diff --git a/potatobase b/potatobase
index 5877e2c..b77ba62 160000
--- a/potatobase
+++ b/potatobase
@@ -1 +1 @@
-Subproject commit 5877e2c2d82645fa44f121884291ee48cf24584d
+Subproject commit b77ba624d6a1c5e62d434ad2d06383604aeab431
此提交位于主分支上，我当前已签出：
$ git branch -a --contains 6877146
* master
remotes/origin/HEAD -> origin/master
remotes/origin/master
remotes/origin/ticket-1479-refactor-blade-json-functions
但是，在子模块上执行 git log 不会显示该提交：
$ git log potatobase | grep 6877146
$
如果我显式签出此提交，它会在日志中：
$ git checkout 6877146
$ git log potatobase | grep 6877146
commit 6877146f1781bfbd4ec3ae2a27121a606f5f688e
为什么此提交未显示在当我签出master时记录？它已经合并到 master 中：
$ git checkout master
$ git merge 6877146
Already up-to-date.
$
I have a commit on master, hash 6877146, which updates a submodule.
$ git show 6877146
commit 6877146f1781bfbd4ec3ae2a27121a606f5f688e
Author: [snip]
Date: Wed Feb 22 16:10:20 2012 +0000
updating potatobase
diff --git a/potatobase b/potatobase
index 5877e2c..b77ba62 160000
--- a/potatobase
+++ b/potatobase
@@ -1 +1 @@
-Subproject commit 5877e2c2d82645fa44f121884291ee48cf24584d
+Subproject commit b77ba624d6a1c5e62d434ad2d06383604aeab431
This commit is on the master branch, which I currently have checked out:
$ git branch -a --contains 6877146
* master
remotes/origin/HEAD -> origin/master
remotes/origin/master
remotes/origin/ticket-1479-refactor-blade-json-functions
However, doing git log on the submodule does not show the commit:
$ git log potatobase | grep 6877146
$
If I explicitly check out this commit, it's in the log:
$ git checkout 6877146
$ git log potatobase | grep 6877146
commit 6877146f1781bfbd4ec3ae2a27121a606f5f688e
Why is this commit not shown in the log when I've checked out master? It's already merged into master:
$ git checkout master
$ git merge 6877146
Already up-to-date.
$
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更新子模块的提交只会更改 git 在初始化/更新子模块时签出的修订版。该提交的提交 ID 与子模块本身的提交 ID 没有任何关系。
A commit updating a submodule just changes the revision git will checkout when you init/update the submodule. The commit id of that commit is in no way related to commit ids of the submodules itself.