Fix long-standing excessive file merges
Since switching to the multihead approach, we've been creating
excessive file-level merges where files are marked as merged with
their ancestors.
This explicitly checks at commit time whether the two parent versions
are linearly related, and if so, reduces the file check-in to a
non-merge. Then the file is compared against the remaining parent,
and, if equal, skips check-in of that file (as it's not changed).
Since we're not checking in all files that were different between
versions, we no longer need to mark so many files for merge. This
removes most of the 'm' state marking as well.
Finally, it is possible to do a tree-level merge with no file-level
changes. This will happen if one user changes file A and another
changes file B. Thus, if we have have two parents, we allow commit to
proceed even if there are no file-level changes.
MERCURIAL QUICK-START
Setting up Mercurial:
Note: some distributions fails to include bits of distutils by
default, you'll need python-dev to install. You'll also need a C
compiler and a 3-way merge tool like merge, tkdiff, or kdiff3.
First, unpack the source:
$ tar xvzf mercurial-<ver>.tar.gz
$ cd mercurial-<ver>
To install system-wide:
$ python setup.py install # change python to python2.3 if 2.2 is default
To install in your home directory (~/bin and ~/lib, actually), run:
$ python2.3 setup.py install --home=~
$ export PYTHONPATH=${HOME}/lib/python # (or lib64/ on some systems)
$ export PATH=${HOME}/bin:$PATH # add these to your .bashrc
And finally:
$ hg # test installation, show help
If you get complaints about missing modules, you probably haven't set
PYTHONPATH correctly.
Setting up a Mercurial project:
$ cd project/
$ hg init # creates .hg
$ hg addremove # add all unknown files and remove all missing files
$ hg commit # commit all changes, edit changelog entry
Mercurial will look for a file named .hgignore in the root of your
repository which contains a set of regular expressions to ignore in
file paths.
Branching and merging:
$ hg clone linux linux-work # create a new branch
$ cd linux-work
$ <make changes>
$ hg commit
$ cd ../linux
$ hg pull ../linux-work # pull changesets from linux-work
$ hg update -m # merge the new tip from linux-work into
# our working directory
$ hg commit # commit the result of the merge
Importing patches:
Fast:
$ patch < ../p/foo.patch
$ hg addremove
$ hg commit
Faster:
$ patch < ../p/foo.patch
$ hg commit `lsdiff -p1 ../p/foo.patch`
Fastest:
$ cat ../p/patchlist | xargs hg import -p1 -b ../p
Exporting a patch:
(make changes)
$ hg commit
$ hg tip
28237:747a537bd090880c29eae861df4d81b245aa0190
$ hg export 28237 > foo.patch # export changeset 28237
Network support:
# pull from the primary Mercurial repo
foo$ hg clone http://selenic.com/hg/
foo$ cd hg
# export your current repo via HTTP with browsable interface
foo$ hg serve -n "My repo" -p 80
# pushing changes to a remote repo with SSH
foo$ hg push ssh://user@example.com/~/hg/
# merge changes from a remote machine
bar$ hg pull http://foo/
bar$ hg update -m # merge changes into your working directory
# Set up a CGI server on your webserver
foo$ cp hgweb.cgi ~/public_html/hg/index.cgi
foo$ emacs ~/public_html/hg/index.cgi # adjust the defaults
For more info:
Documentation in doc/
Mercurial website at http://selenic.com/mercurial
Mercurial wiki at http://selenic.com/mercurial/wiki