What can i configure in Mercurial

See in MercurialIni.

I get an error while cloning a remote repository via ssh

If your remote repository is cloned thusly

  hg clone ssh://USER@REMOTE/path/to/repo

And, you find that after successful ssh authentication you get the error message remote: abort: repository path/to/repo not found! , then you need to know the following:

I get an "ssl required" error message when trying to push changes

If you're on a network you trust you can add

push_ssl = false

in your <repository-name>/.hg/hgrc file. (Taken from HgWebDirStepByStep)

There's a reason for requiring SSL, however. If you do not trust the network you are using do not change this.

I did an hg pull and my working directory is empty!

There are two parts to Mercurial: the repository and the working directory. hg pull pulls all new changes from a remote repository into the local one but doesn't alter the working directory.

This keeps you from upsetting your work in progress, which may not be ready to merge with the new changes you've pulled and also allows you to manage merging more easily (see below about best practices).

To update your working directory, run hg update. If you're sure you want to update your working directory on a pull, you can also use hg pull -u. This will refuse to merge or overwrite local changes.

I want to retrieve an old version of my project, what do I do?

You want hg update -C <version>, which will clobber your current version with the requested version.

You don't want hg revert <version>, which reverts changes in your working directory back to that version, but keeps the current parents for the next checkin. This command exists for undoing changes in current versions, not for working on old versions.

hg status shows changed files but hg diff doesn't!

hg status reports when file contents or flags have changed relative to either parent. hg diff only reports changed contents relative to the first parent. You can see flag information with the --git option to hg diff and deltas relative to the other parent with -r.

hg export or log -p shows a strange diff for my merge!

The diff shown by hg export and hg log is always against the first parent for consistency. Also, the files listed are only the files that have changed relative to both parents.

I did an hg revert and my working directory still has changes in it!

You've probably done an hg merge, which means your working directory now has two parents according to hg parents. A subsequent hg revert will revert your working directory back to the primary parent, thus leaving you with the differences between the two parents. hg update -C will revert the left files.

If you're trying to switch between revisions in history, you probably want hg update -C.

I want a clean, empty working directory

The easiest thing to do is run hg clone -U which will create a fresh clone without checking out a working copy.

Note: you might want to copy hgrc file from your old repository.

I committed a change containing nuclear launch codes, how do I delete it permanently?

If you've just committed it, and you haven't done any other commits or pulls since, you may be able to use rollback to undo the last commit transaction:

$ hg rollback
rolling back last transaction

If you've made other changes but you haven't yet published it to the world, you can do something like the following:

$ hg clone -r <untainted-revision> tainted-repo untainted-repo

The strip command in the mq extension may also be useful here for doing operations in place.

This will get you a new repo without the tainted change or the ones that follow it. You can import the further changes with hg export and hg import or by using the TransplantExtension. See TrimmingHistory for possible future approaches.

If you've already pushed your changes to a public repository that people have cloned from, the genie is out of the bottle. Good luck cleaning up your mess.

“Judge Tries to Unring Bell Hanging Around Neck of Horse Already Out of Barn Being Carried on Ship That Has Sailed.” - William G. Childs

I tried to check in an empty directory and it failed!

Mercurial doesn't track directories, it only tracks files. Which works for just about everything, except directories with no files in them. As empty directories aren't terribly useful and it makes the system much simpler, we don't intend to fix this any time soon. A couple workarounds:

I want to get an email when a commit happens!

See CommitHook for an example.

I'd like to put only some few files of a large directory tree (home dir for instance) under mercurial's control, and it is taking forever to diff or commit

Just do a

printf "syntax: glob\n*\n" > .hgignore

or, if you are using 0.7 or below,

printf ".*\n" > .hgignore

This will make hg ignore all files except those explicitly added.

Why is the modification time of files not restored on checkout?

If you use automatic build tools like make or distutils, some built files might not be updated if you checkout an older revision of a file. Additionally a newer changeset might have an older commit timestamp due to pulling from someone else or importing patches somebody has done some time ago, so checking out a newer changeset would have to make the files older in this case.

If you need predictable timestamps you can use hg archive, which can do something like a checkout in a separate directory. Because this directory is newly created, there is nothing like switching to a different changeset afterwards, therefore the above mentioned problems don't apply here.

My merge program failed, and now I don't know what to do

If your merge program fails you'll find yourself in a state where both hg up and hg merge produce the same, unhelpful output.

abort: outstanding uncommitted merges

When this first happened, mercurial told you what to do, but if you've lost those instructions, how does one recover them?

Why does hg merge not invoke merge again? Why the unhelpful output?

Any way to 'hg push' and have an automatic 'hg update' on the remote server?

changegroup = hg update >&2

This goes in .hg/hgrc on the remote repository. Output has to be redirected to stderr (or /dev/null), because stdout is used for the data stream.

How can store my HTTP login once and for all ?

You can specify the usename and password in the URL like:


Then add a new entry in the paths section of your hgrc file.