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<div id="header">
<h1>How to revert an existing commit</h1>
<span id="revdate"></span>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>One of the changes I pulled into the <em>master</em> branch turns out to
break building Git with GCC 2.95.  While they were well-intentioned
portability fixes, keeping things working with gcc-2.95 was also
important.  Here is what I did to revert the change in the <em>master</em>
branch and to adjust the <em>seen</em> branch, using core Git tools and
barebone Porcelain.</p></div>
<div class="paragraph"><p>First, prepare a throw-away branch in case I screw things up.</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git checkout -b revert-c99 master</code></pre>
</div></div>
<div class="paragraph"><p>Now I am on the <em>revert-c99</em> branch.  Let&#8217;s figure out which commit to
revert.  I happen to know that the top of the <em>master</em> branch is a
merge, and its second parent (i.e. foreign commit I merged from) has
the change I would want to undo.  Further I happen to know that that
merge introduced 5 commits or so:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git show-branch --more=4 master master^2 | head
* [master] Merge refs/heads/portable from http://www.cs.berkeley....
 ! [master^2] Replace C99 array initializers with code.
--
-  [master] Merge refs/heads/portable from http://www.cs.berkeley....
*+ [master^2] Replace C99 array initializers with code.
*+ [master^2~1] Replace unsetenv() and setenv() with older putenv().
*+ [master^2~2] Include sys/time.h in daemon.c.
*+ [master^2~3] Fix ?: statements.
*+ [master^2~4] Replace zero-length array decls with [].
*  [master~1] tutorial note about git branch</code></pre>
</div></div>
<div class="paragraph"><p>The <em>--more=4</em> above means "after we reach the merge base of refs,
show until we display four more common commits".  That last commit
would have been where the "portable" branch was forked from the main
git.git repository, so this would show everything on both branches
since then.  I just limited the output to the first handful using
<em>head</em>.</p></div>
<div class="paragraph"><p>Now I know <em>master^2~4</em> (pronounce it as "find the second parent of
the <em>master</em>, and then go four generations back following the first
parent") is the one I would want to revert.  Since I also want to say
why I am reverting it, the <em>-n</em> flag is given to <em>git revert</em>.  This
prevents it from actually making a commit, and instead <em>git revert</em>
leaves the commit log message it wanted to use in <em>.msg</em> file:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git revert -n master^2~4
$ cat .msg
Revert "Replace zero-length array decls with []."

This reverts 6c5f9baa3bc0d63e141e0afc23110205379905a4 commit.
$ git diff HEAD ;# to make sure what we are reverting makes sense.
$ make CC=gcc-2.95 clean test ;# make sure it fixed the breakage.
$ make clean test ;# make sure it did not cause other breakage.</code></pre>
</div></div>
<div class="paragraph"><p>The reverted change makes sense (from reading the <em>diff</em> output), does
fix the problem (from <em>make CC=gcc-2.95</em> test), and does not cause new
breakage (from the last <em>make test</em>).  I&#8217;m ready to commit:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git commit -a -s ;# read .msg into the log,
                    # and explain why I am reverting.</code></pre>
</div></div>
<div class="paragraph"><p>I could have screwed up in any of the above steps, but in the worst
case I could just have done <em>git checkout master</em> to start over.
Fortunately I did not have to; what I have in the current branch
<em>revert-c99</em> is what I want.  So merge that back into <em>master</em>:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git checkout master
$ git merge revert-c99 ;# this should be a fast-forward
Updating from 10d781b9caa4f71495c7b34963bef137216f86a8 to e3a693c...
 cache.h        |    8 ++++----
 commit.c       |    2 +-
 ls-files.c     |    2 +-
 receive-pack.c |    2 +-
 server-info.c  |    2 +-
 5 files changed, 8 insertions(+), 8 deletions(-)</code></pre>
</div></div>
<div class="paragraph"><p>There is no need to redo the test at this point.  We fast-forwarded
and we know <em>master</em> matches <em>revert-c99</em> exactly.  In fact:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git diff master..revert-c99</code></pre>
</div></div>
<div class="paragraph"><p>says nothing.</p></div>
<div class="paragraph"><p>Then we rebase the <em>seen</em> branch as usual.</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git checkout seen
$ git tag seen-anchor seen
$ git rebase master
* Applying: Redo "revert" using three-way merge machinery.
First trying simple merge strategy to cherry-pick.
* Applying: Remove git-apply-patch-script.
First trying simple merge strategy to cherry-pick.
Simple cherry-pick fails; trying Automatic cherry-pick.
Removing Documentation/git-apply-patch-script.txt
Removing git-apply-patch-script
* Applying: Document "git cherry-pick" and "git revert"
First trying simple merge strategy to cherry-pick.
* Applying: mailinfo and applymbox updates
First trying simple merge strategy to cherry-pick.
* Applying: Show commits in topo order and name all commits.
First trying simple merge strategy to cherry-pick.
* Applying: More documentation updates.
First trying simple merge strategy to cherry-pick.</code></pre>
</div></div>
<div class="paragraph"><p>The temporary tag <em>seen-anchor</em> is me just being careful, in case <em>git
rebase</em> screws up.  After this, I can do these for sanity check:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git diff seen-anchor..seen ;# make sure we got the master fix.
$ make CC=gcc-2.95 clean test ;# make sure it fixed the breakage.
$ make clean test ;# make sure it did not cause other breakage.</code></pre>
</div></div>
<div class="paragraph"><p>Everything is in the good order.  I do not need the temporary branch
or tag anymore, so remove them:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ rm -f .git/refs/tags/seen-anchor
$ git branch -d revert-c99</code></pre>
</div></div>
<div class="paragraph"><p>It was an emergency fix, so we might as well merge it into the
<em>release candidate</em> branch, although I expect the next release would
be some days off:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git checkout rc
$ git pull . master
Packing 0 objects
Unpacking 0 objects

* commit-ish: e3a693c...        refs/heads/master from .
Trying to merge e3a693c... into 8c1f5f0... using 10d781b...
Committed merge 7fb9b7262a1d1e0a47bbfdcbbcf50ce0635d3f8f
 cache.h        |    8 ++++----
 commit.c       |    2 +-
 ls-files.c     |    2 +-
 receive-pack.c |    2 +-
 server-info.c  |    2 +-
 5 files changed, 8 insertions(+), 8 deletions(-)</code></pre>
</div></div>
<div class="paragraph"><p>And the final repository status looks like this:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git show-branch --more=1 master seen rc
! [master] Revert "Replace zero-length array decls with []."
 ! [seen] git-repack: Add option to repack all objects.
  * [rc] Merge refs/heads/master from .
---
 +  [seen] git-repack: Add option to repack all objects.
 +  [seen~1] More documentation updates.
 +  [seen~2] Show commits in topo order and name all commits.
 +  [seen~3] mailinfo and applymbox updates
 +  [seen~4] Document "git cherry-pick" and "git revert"
 +  [seen~5] Remove git-apply-patch-script.
 +  [seen~6] Redo "revert" using three-way merge machinery.
  - [rc] Merge refs/heads/master from .
++* [master] Revert "Replace zero-length array decls with []."
  - [rc~1] Merge refs/heads/master from .
... [master~1] Merge refs/heads/portable from http://www.cs.berkeley....</code></pre>
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