$ cat >> $HGRCPATH <<EOF

  > [extensions]

  > convert=

  > [convert]

  > hg.saverev=False

  > EOF

  $ hg help convert

  hg convert [OPTION]... SOURCE [DEST [REVMAP]]

  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.

      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:

        <source ID> <destination ID>

      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 (eg: 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]+)}}"

      hook.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.

      hook.cvschangesets

                  Specify a Python function to be called after the changesets

                  are calculated from the 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".

      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.

  options:

   -s --source-type TYPE source repository type

   -d --dest-type TYPE   destination repository type

   -r --rev REV          import up to target revision REV

   -A --authormap FILE   remap usernames using this file

      --filemap FILE     remap file names using contents of file

      --splicemap FILE   splice synthesized history into place

      --branchmap FILE   change branch names while converting

      --branchsort       try to sort changesets by branches

      --datesort         try to sort changesets by date

      --sourcesort       preserve source changesets order

  use "hg -v help convert" to show more info

  $ hg init a

  $ cd a

  $ echo a > a

  $ hg ci -d'0 0' -Ama

  adding a

  $ hg cp a b

  $ hg ci -d'1 0' -mb

  $ hg rm a

  $ hg ci -d'2 0' -mc

  $ hg mv b a

  $ hg ci -d'3 0' -md

  $ echo a >> a

  $ hg ci -d'4 0' -me

  $ cd ..

  $ hg convert a 2>&1 | grep -v 'subversion python bindings could not be loaded'

  assuming destination a-hg

  initializing destination a-hg repository

  scanning source...

  sorting...

  converting...

  4 a

  3 b

  2 c

  1 d

  0 e

  $ hg --cwd a-hg pull ../a

  pulling from ../a

  searching for changes

  no changes found

  $ touch bogusfile

should fail

  $ hg convert a bogusfile

  initializing destination bogusfile repository

  abort: cannot create new bundle repository

  [255]

  $ mkdir bogusdir

  $ chmod 000 bogusdir

should fail

  $ hg convert a bogusdir

  abort: Permission denied: bogusdir

  [255]

should succeed

  $ chmod 700 bogusdir

  $ hg convert a bogusdir

  initializing destination bogusdir repository

  scanning source...

  sorting...

  converting...

  4 a

  3 b

  2 c

  1 d

  0 e

test pre and post conversion actions

  $ echo 'include b' > filemap

  $ hg convert --debug --filemap filemap a partialb | \

  >     grep 'run hg'

  run hg source pre-conversion action

  run hg sink pre-conversion action

  run hg sink post-conversion action

  run hg source post-conversion action

converting empty dir should fail "nicely

  $ mkdir emptydir

override $PATH to ensure p4 not visible; use $PYTHON in case we're

running from a devel copy, not a temp installation

  $ PATH="$BINDIR" $PYTHON "$BINDIR"/hg convert emptydir

  assuming destination emptydir-hg

  initializing destination emptydir-hg repository

  emptydir does not look like a CVS checkout

  emptydir does not look like a Git repository

  emptydir does not look like a Subversion repository

  emptydir is not a local Mercurial repository

  emptydir does not look like a darcs repository

  emptydir does not look like a monotone repository

  emptydir does not look like a GNU Arch repository

  emptydir does not look like a Bazaar repository

  cannot find required "p4" tool

  abort: emptydir: missing or unsupported repository

  [255]

convert with imaginary source type

  $ hg convert --source-type foo a a-foo

  initializing destination a-foo repository

  abort: foo: invalid source repository type

  [255]

convert with imaginary sink type

  $ hg convert --dest-type foo a a-foo

  abort: foo: invalid destination repository type

  [255]

testing: convert must not produce duplicate entries in fncache

  $ hg convert a b

  initializing destination b repository

  scanning source...

  sorting...

  converting...

  4 a

  3 b

  2 c

  1 d

  0 e

contents of fncache file:

  $ cat b/.hg/store/fncache | sort

  data/a.i

  data/b.i