= repomapper(1) =
:doctype: manpage

== NAME ==
repomapper - update and manipulate contributor maps

== SYNOPSIS ==

*repomapper* [-i] [-p 'passwordfile'] [-u 'updatefile'] [-h 'host'] 'contribmap'

[[description]]
== DESCRIPTION ==

Older, centralized version-control systems such as CVS and
SVN centralize a repository on one host and identify users by their
account names on that host.  Distributed version-control systems such
as git and Mercurial identify users by a netwide-unique ID consisting
of a name-among-humans followed by an email address.

When moving a repository from a centralized to a distributed
system, therefore, one of the prerequisites is a contributor map that
associates each account name on the old system to a DVCS-style ID
on the new one.  This tool automates parts of that process.

The main argument file must be a contributor map such as is read by
the "authors read" subcommand of reposurgeon(1). It may be a fresh or
stub map, produced by "authors write" before any human-name or email
information has been added to the repository.  Or it may have
name-among-humans and email information filled in for some entries.

A stub map entry looks something like this:

----
foonly = foonly <foonly>
----

The same entry, fully filled in, might look something like this:

----
foonly = Fred Foonly <foonly@fubar.net>
----

The default behavior of the tool is to report all map entries,
in effect a sorting copy of the file.

With -i, it reports only entries that are not yet in DVCS form -
that is, either the fullname field on the right side of the equals
sign is identical to the account name on the left, or the email field
contains no @-sign, or both.

With the -p option, this tool fills in the full-name field using the
password file given as the option's argument. Only the username and
the comment (or 'gecos') field containing the user's name-among-humans
are used. Other fields are ignored, including the password-hash field.
(On modern Unixes this field does not contain the actual hash, which
lives in a different file named '/etc/shadow', so '/etc/passwd' can be
shared without security risk.)

In the -p mode, for each entry in the contrib file the program
looks for a username in the password file matching the name to the
left of the equal sign.  If a match is found, the user's
name-among-humans is extracted from the gecos field and replaces the
text between the "=" and the "<".

Thus, the stub line above and the '/etc/passwd' line

----
foonly:x:1000:1000:Fred Foonly,,,:/home/foonly:/bin/bash
----

will combine to produce this on output:

----
foonly = Fred Foonly <foonly>
----

Note that the email-address part (and, if present, the
optional trailing timezone field) are not normally modified.

However, if the -h option is given, the argument is taken to be
a host name which should be appended (after a @) to every email field
that does not already contain a @.  The argument would typically be the
fully-qualified domain name of the repository host.

Thus, if the passwd file still contains an entry for every
committer (which might not be the case if inactive committer accounts
were ever removed), -p mode combined with an -h option can produce
an entire, valid contributor map.

In the -u mode of operation, the option argument must be a
second contributor file, which is taken as a source of updates.  Each
contributor entry with a username not matching any in the first
contributor map is copied into the first map, which is output.

Output from this tool is always a contribution map sorted by
username.

[[see_also]]
== SEE ALSO ==

reposurgeon(1).

[[author]]
== AUTHOR ==

Eric S. Raymond <esr@thyrsus.com>. This tool is distributed with
reposurgeon; see the http://www.catb.org/~esr/reposurgeon[project
page].

// end
