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+convert a foreign SCM repository to a Mercurial one.

Accepted source formats [identifiers]:

- Mercurial [hg]
- CVS [cvs]
- Darcs [darcs]
- git [git]
- Subversion [svn]
- Monotone [mtn]
- GNU Arch [gnuarch]
- Bazaar [bzr]
- Perforce [p4]

Accepted destination formats [identifiers]:

- Mercurial [hg]
- Subversion [svn] (history on branches is not preserved)

If no revision is given, all revisions will be converted.
Otherwise, convert will only import up to the named revision
(given in a format understood by the source).

If no destination directory name is specified, it defaults to the
basename of the source with ``-hg`` appended. If the destination
repository doesn't exist, it will be created.

By default, all sources except Mercurial will use --branchsort.
Mercurial uses --sourcesort to preserve original revision numbers
order. Sort modes have the following effects:

--branchsort convert from parent to child revision when possible,
which means branches are usually converted one after
the other. It generates more compact repositories.

--datesort sort revisions by date. Converted repositories have
good-looking changelogs but are often an order of
magnitude larger than the same ones generated by
--branchsort.

--sourcesort try to preserve source revisions order, only
supported by Mercurial sources.

--closesort try to move closed revisions as close as possible
to parent branches, only supported by Mercurial
sources.

If ``REVMAP`` isn't given, it will be put in a default location
(``<dest>/.hg/shamap`` by default). The ``REVMAP`` is a simple
text file that maps each source commit ID to the destination ID
for that revision, like so::

If the file doesn't exist, it's automatically created. It's
updated on each commit copied, so :hg:`convert` can be interrupted
and can be run repeatedly to copy new commits.

The authormap is a simple text file that maps each source commit
author to a destination commit author. It is handy for source SCMs
that use unix logins to identify authors (e.g.: CVS). One line per
author mapping and the line format is::

source author = destination author

Empty lines and lines starting with a ``#`` are ignored.

The filemap is a file that allows filtering and remapping of files
and directories. Each line can contain one of the following
directives::

include path/to/file-or-dir

exclude path/to/file-or-dir

rename path/to/source path/to/destination

Comment lines start with ``#``. A specified path matches if it
equals the full relative name of a file or one of its parent
directories. The ``include`` or ``exclude`` directive with the
longest matching path applies, so line order does not matter.

The ``include`` directive causes a file, or all files under a
directory, to be included in the destination repository, and the
exclusion of all other files and directories not explicitly
included. The ``exclude`` directive causes files or directories to
be omitted. The ``rename`` directive renames a file or directory if
it is converted. To rename from a subdirectory into the root of
the repository, use ``.`` as the path to rename to.

The splicemap is a file that allows insertion of synthetic
history, letting you specify the parents of a revision. This is
useful if you want to e.g. give a Subversion merge two parents, or
graft two disconnected series of history together. Each entry
contains a key, followed by a space, followed by one or two
comma-separated values::

key parent1, parent2

The key is the revision ID in the source
revision control system whose parents should be modified (same
format as a key in .hg/shamap). The values are the revision IDs
(in either the source or destination revision control system) that
should be used as the new parents for that node. For example, if
you have merged "release-1.0" into "trunk", then you should
specify the revision on "trunk" as the first parent and the one on
the "release-1.0" branch as the second.

The branchmap is a file that allows you to rename a branch when it is
being brought in from whatever external repository. When used in
conjunction with a splicemap, it allows for a powerful combination
to help fix even the most badly mismanaged repositories and turn them
into nicely structured Mercurial repositories. The branchmap contains
lines of the form::

original_branch_name new_branch_name

where "original_branch_name" is the name of the branch in the
source repository, and "new_branch_name" is the name of the branch
is the destination repository. No whitespace is allowed in the
branch names. This can be used to (for instance) move code in one
repository from "default" to a named branch.

Mercurial Source
################

The Mercurial source recognizes the following configuration
options, which you can set on the command line with ``--config``:

:convert.hg.ignoreerrors: ignore integrity errors when reading.
Use it to fix Mercurial repositories with missing revlogs, by
converting from and to Mercurial. Default is False.

:convert.hg.saverev: store original revision ID in changeset
(forces target IDs to change). It takes a boolean argument and
defaults to False.

:convert.hg.startrev: convert start revision and its descendants.
It takes a hg revision identifier and defaults to 0.

CVS Source
##########

CVS source will use a sandbox (i.e. a checked-out copy) from CVS
to indicate the starting point of what will be converted. Direct
access to the repository files is not needed, unless of course the
repository is ``:local:``. The conversion uses the top level
directory in the sandbox to find the CVS repository, and then uses
CVS rlog commands to find files to convert. This means that unless
a filemap is given, all files under the starting directory will be
converted, and that any directory reorganization in the CVS
sandbox is ignored.

The following options can be used with ``--config``:

:convert.cvsps.cache: Set to False to disable remote log caching,
for testing and debugging purposes. Default is True.

:convert.cvsps.fuzz: Specify the maximum time (in seconds) that is
allowed between commits with identical user and log message in
a single changeset. When very large files were checked in as
part of a changeset then the default may not be long enough.
The default is 60.

:convert.cvsps.mergeto: Specify a regular expression to which
commit log messages are matched. If a match occurs, then the
conversion process will insert a dummy revision merging the
branch on which this log message occurs to the branch
indicated in the regex. Default is ``{{mergetobranch
([-\w]+)}}``

:convert.cvsps.mergefrom: Specify a regular expression to which
commit log messages are matched. If a match occurs, then the
conversion process will add the most recent revision on the
branch indicated in the regex as the second parent of the
changeset. Default is ``{{mergefrombranch ([-\w]+)}}``

:convert.localtimezone: use local time (as determined by the TZ
environment variable) for changeset date/times. The default
is False (use UTC).

:hooks.cvslog: Specify a Python function to be called at the end of
gathering the CVS log. The function is passed a list with the
log entries, and can modify the entries in-place, or add or
delete them.

:hooks.cvschangesets: Specify a Python function to be called after
the changesets are calculated from the CVS log. The
function is passed a list with the changeset entries, and can
modify the changesets in-place, or add or delete them.

An additional "debugcvsps" Mercurial command allows the builtin
changeset merging code to be run without doing a conversion. Its
parameters and output are similar to that of cvsps 2.1. Please see
the command help for more details.

Subversion Source
#################

Subversion source detects classical trunk/branches/tags layouts.
By default, the supplied ``svn://repo/path/`` source URL is
converted as a single branch. If ``svn://repo/path/trunk`` exists
it replaces the default branch. If ``svn://repo/path/branches``
exists, its subdirectories are listed as possible branches. If
``svn://repo/path/tags`` exists, it is looked for tags referencing
converted branches. Default ``trunk``, ``branches`` and ``tags``
values can be overridden with following options. Set them to paths
relative to the source URL, or leave them blank to disable auto
detection.

The following options can be set with ``--config``:

:convert.svn.branches: specify the directory containing branches.
The default is ``branches``.

:convert.svn.tags: specify the directory containing tags. The
default is ``tags``.

:convert.svn.trunk: specify the name of the trunk branch. The
default is ``trunk``.

:convert.localtimezone: use local time (as determined by the TZ
environment variable) for changeset date/times. The default
is False (use UTC).

Source history can be retrieved starting at a specific revision,
instead of being integrally converted. Only single branch
conversions are supported.

:convert.svn.startrev: specify start Subversion revision number.
The default is 0.

Perforce Source
###############

The Perforce (P4) importer can be given a p4 depot path or a
client specification as source. It will convert all files in the
source to a flat Mercurial repository, ignoring labels, branches
and integrations. Note that when a depot path is given you then
usually should specify a target directory, because otherwise the
target may be named ``...-hg``.

It is possible to limit the amount of source history to be
converted by specifying an initial Perforce revision:

:convert.p4.startrev: specify initial Perforce revision (a
Perforce changelist number).

Mercurial Destination
#####################

The following options are supported:

:convert.hg.clonebranches: dispatch source branches in separate
clones. The default is False.

:convert.hg.tagsbranch: branch name for tag revisions, defaults to
``default``.

:convert.hg.usebranchnames: preserve branch names. The default is
True.
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