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Reduce the amount of stat traffic generated by a walk....
Reduce the amount of stat traffic generated by a walk. When we switched to the new walk code for commands, we no longer passed a list of specific files to the repo or dirstate walk or changes methods. This meant that we always walked and attempted to match everything, which was not efficient. Now, if we are given any patterns to match, or nothing at all, we still walk everything. But if we are given only file names that contain no glob characters, we only walk those.
Bryan O'Sullivan -
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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