Admin at 21:23, 18 September 2018

2018-09-18T21:23:50Z

← Older revision		Revision as of 21:23, 18 September 2018
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	You could write a more complex script which views the contents of that tree and sets the date appropriately.		You could write a more complex script which views the contents of that tree and sets the date appropriately.


			[[Category:Git]]
			[[Category:Git History]]
			[[Category:Rewriting Git History]]

Admin: Created page with "via https://www.reddit.com/r/git/comments/2pjgsx/git_how_do_i_modify_timestamps_on_commit_objects/ ==How to modify entire commit history== Suppose you want to modify your en..."

2018-09-18T21:23:23Z

Created page with "via https://www.reddit.com/r/git/comments/2pjgsx/git_how_do_i_modify_timestamps_on_commit_objects/ ==How to modify entire commit history== Suppose you want to modify your en..."

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==How to modify entire commit history==

Suppose you want to modify your entire git commit history. To do that, you can use the <code>git filter-branch</code> command to run a command/script on every commit that can be reached from HEAD (i.e., starting from HEAD and traversing backwards to root).

<pre>
git filter-branch --commit-filter CMD
</pre>

<code>CMD</code> is a command that is passed the same arguments as <code>git commit-tree</code>.

It should do what <code>git commit-tree</code> does.

(Which is...?)

Here's an example (executable) shell script called <code>/tmp/rewrite.sh</code>:

<pre>
#!/bin/sh
export GIT_AUTHOR_DATE=1234567890+0000
export GIT_COMMITTER_DATE=1234567890+0000
git commit-tree "$@"
</pre>

Now, when you rewrite the history, the entire history will appear to have been committed at the same timestamp, 1234567890:

Before:

<pre>
$ git log
commit 21a52d0c3a27faa1f8a0c3dc894ffb3f529b0d65
Author: Your Name
Date: Tue Dec 16 23:50:51 2014 -0500

second commit

commit 2e7a613b24c55ba383440a88dc9b5b55cddca5ad
Author: Your Name
Date: Tue Dec 16 23:50:38 2014 -0500

first commit
</pre>

Apply git filter-branch:

<pre>
$ git filter-branch --commit-filter '/tmp/rewrite.sh "$@"'
Rewrite 21a52d0c3a27faa1f8a0c3dc894ffb3f529b0d65 (2/2)
Ref 'refs/heads/master' was rewritten
</pre>

After:

<pre>
$ git log
commit 15bf1d225ffb17103e0476687dcd6e0a5ce683c8
Author: Your Name
Date: Fri Feb 13 23:31:30 2009 +0000

second commit

commit b864f505b2a923b69f9da8dc7cb1c19d45dad92f
Author: Your Name
Date: Fri Feb 13 23:31:30 2009 +0000

first commit
</pre>

Original refs are still stored in <code>.git/refs/original</code>:

<pre>
$ cat .git/refs/original/refs/heads/master
21a52d0c3a27faa1f8a0c3dc894ffb3f529b0d65
</pre>

The filter command is passed the same arguments as git commit-tree.

The first argument will be the tree of the commit to rewrite.

You could write a more complex script which views the contents of that tree and sets the date appropriately.

Git/History/Rewriting - Revision history

Admin at 21:23, 18 September 2018

Admin: Created page with "via https://www.reddit.com/r/git/comments/2pjgsx/git_how_do_i_modify_timestamps_on_commit_objects/ ==How to modify entire commit history== Suppose you want to modify your en..."