RE: git filter-branch re-write history over a range of commits did notwork

From: LU Chuck <chuck.lu@edenred.com>
Date: May 28, 2019, 07:10 UTC
Message-ID: <DB7PR05MB5573B5FC17FD1F221F7AAD558D1E0@DB7PR05MB5573.eurprd05.prod.outlook.com>
In-Reply-To: <fa23e865-94ed-308f-6a19-75b6ea89eec3@kdbg.org>

Show 42 quoted lines

> -----Original Message-----
> From: Johannes Sixt <j6t@kdbg.org>
> Sent: Tuesday, May 28, 2019 2:23 PM
> To: LU Chuck <Chuck.LU@edenred.com>
> Cc: Philip Oakley <philipoakley@iee.org>; git@vger.kernel.org; chuck.lu@qq.com
> Subject: Re: git filter-branch re-write history over a range of commits did notwork
> 
> Am 28.05.19 um 07:42 schrieb LU Chuck:
> >> From: Philip Oakley <philipoakley@iee.org> The three dots is provided
> >> in the literal EXAMPLES section of the man page. That is probably an
> >> error, as I think it is meant to be an ellipsis to indicate 'insert
> >> other options here'.
> >>
> >> Simply remove the three dots ('symmetric diff notation') .
> >>
> >> Not sure what the correct change to the man page should be, but
> >> clearly it has caused confusion. It also takes a moment to properly
> >> realise which commits the two dot notation will refer to in the
> >> example which may further compound the confusion about the three dots.
> >>
> >> Philip
> > [LU Chuck] Hi Hannes,
> >          I used ... literally when I cited the command. I write the command
> with ... directly as the document introduce the usage like that.
> >          You can check the document
> https://urldefense.proofpoint.com/v2/url?u=https-3A__git-2Dscm.com_docs_git
> -2Dfilter-2Dbranch-23-5Fexamples&d=DwICaQ&c=O17m6UdqOAIZh9XQ8pTl4g&
> r=VcGeIeOZ_8_zlrQNSboenYltfxGNIXN_qG6VpZgXVRk&m=VuNdOzceo68ZUnKOA
> cEPKJcWJGVbj9rVx7mqEMBkF9s&s=fwT_YsHVIcZLkZkXcwN0XzEfYZuZVvkThSM-
> V_o2na8&e=  about the --env-filter section.
> 
> Copying and pasting examples literally is dangerous. You should know what you
> are doing.
> 
> "..." is a revision range that computes the mergebase between HEAD and HEAD,
> which is (surprise!) HEAD, and then includes the two end points, but excludes
> everything below the mergebase. So, the revision specification that your
> command ends up with is
> 
>      HEAD HEAD ^HEAD ^67d9d9 f70bf4
> 
> Which is empty if f70bf4 is an ancestor of HEAD.

[LU Chuck] Sorry, I can't understand this part, did you have an documentation about the explanation for ...?
         "computes the mergebase between HEAD and HEAD" I have no idea about this. And you also talked about mergebase, but in my situation, there is only one branch with 5 commits. I did not have a mergebase.
         You can check the detail description below.

Show 21 quoted lines

> 
> >          Hi Philip,
> >          I also tried to execute the command without ...,
> >          git filter-branch --env-filter 'export
> GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE"' 67d9d9..f70bf4
> >          then I will get another error " You must specify a ref to rewrite."
> 
> You cannot restrict your filter to a subset of commits like this. After all, all commits
> that descend from one of the rewritten commits must also change, up to and
> including to the branch refs. Therefore, it is necessary to mention the branches
> that you rewrite in this manner.
> 
> Perhaps:
> 
>    git filter-branch --env-filter '
>      if git merge-base --is-ancestor $GIT_COMMIT f70bf4; then
>        export GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE"
>      fi' -- 67d9d9..master
> 
> This assumes that only branch master is affected by the rewriting. Use --all if you
> have many affected branches.

[LU Chuck] Hi Hannes,
         I have tried with the command you provided, what I got is 
             Rewrite 31cd5ef6f068c46222fe185870c09c959dd7113e (7/7) (6 seconds passed, remaining 0 predicted)
             WARNING: Ref 'refs/heads/master' is unchanged
         I am wondering why I got this warning, what I did have nothing to do with master branch.
         I am not on branch master. My current branch is temp and HEAD point to temp branch, and temp point to commit f70bf4.
         Actually you can clone the repository https://github.com/chucklu/LeetCode and git checkout -b temp origin/temp. Then do a simple test.

         My purpose is as I mentioned in last email,
         I have five commits A,B,C,D,E with commit id as following:
         A(67d9d9)<--B(9c1580)<--C(2eec4d)<--D(a45995)<--E(f70bf4)  
         The temp branch point to commit E(f70bf4) and the HEAD point to temp branch.
         The commits B,C,D,E 's commiter date and author date are not the same. I want to use filter-branch command to make the commiter date same as the author date.

> 
> -- Hannes