To change the commit message of the last commit when the last mercurial operation was a commit you can use
$ hg rollback
to roll back the last commit and re-commit it with the new message:
$ hg ci -m 'new message'
But be careful because the rollback command also rolls back following operations:
- import
- pull
- push (with this repository as the destination)
- unbundle
(see hg help rollback)
Thus, if you are not sure if the last mercurial command was a hg ci, don't use hg rollback.
You can use the mq extension, which is distributed with Mercurial, to change the commit message of any commit.
This approach is only useful when there aren't already cloned repositories in the public that contain the changeset you want to rename because doing so alters the changeset hash of it and all following changesets.
That means that you have to be able to remove all existing clones that include the changeset you want to rename, or else pushing/pulling between them wouldn't work.
To use the mq extension you have to explicitly enable it, e.g. under UNIX check your ~/.hgrc, which should contain following lines:
[extensions]
mq=
Say that you want to change revision X - first qimport imports revisions X and following. Now they are registered as a stack of applied patches. Popping (qpop) the complete stack except X makes X available for changes via qrefresh. After the commit message is changed you have to push all patches again (qpop) to re-apply them, i.e. to recreate the following revisions. The stack of patches isn't needed any, thus it can be removed via qfinish.
Following demo script shows all operations in action. In the example the commit message of third changeset is renamed.
# test.sh
cd $(dirname $0)
set -x -e -u
echo INFO: Delete old stuff
rm -rf .hg `seq 5`
echo INFO: Setup repository with 5 revisions
hg init
echo '[ui]' > .hg/hgrc
echo 'username=Joe User <[email protected]>' >> .hg/hgrc
echo 'style = compact' >> .hg/hgrc
echo '[extensions]' >> .hg/hgrc
echo 'mq=' >> .hg/hgrc
for i in `seq 5`; do
touch $i && hg add $i && hg ci -m "changeset message $i" $i
done
hg log
echo INFO: Need to rename the commit message on the 3rd revision
echo INFO: Displays all patches
hg qseries
echo INFO: Import all revisions including the 3rd to the last one as patches
hg qimport -r $(hg identify -n -r 'children(2)'):tip
hg qseries
echo INFO: Pop patches
hg qpop -a
hg qseries
hg log
hg parent
hg commit --amend -m 'CHANGED MESSAGE'
hg log
echo INFO: Push all remaining patches
hg qpush -a
hg log
hg qseries
echo INFO: Remove all patches
hg qfinish -a
hg qseries && hg log && hg parent
Copy it to an empty directory an execute it e.g. via:
$ bash test.sh 2>&1 | tee log
The output should include the original changeset message:
+ hg log
[..]
2 53bc13f21b04 2011-08-31 17:26 +0200 juser
changeset message 3
And the rename operation the changed message:
+ hg log
[..]
2 3ff8a832d057 2011-08-31 17:26 +0200 juser
CHANGED MESSAGE
(Tested with Mercurial 4.5.2)
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