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=head1 NAME

SVK::Help::Environment - A list of svk's environment variables

=head1 DESCRIPTION

A number of system environment variables influence how svk runs. Below is 
a complete list of variables you can use to alter svk's behavior.

=head2 All Platforms

=over 

=item $SVKROOT

Unless you tell it otherwise, svk stores your configuration and repository in
$HOME/.svk.  If you set SVKROOT to a path on disk, svk will look there instead
of in $HOME/.svk.


=item $SVN_EDITOR / $EDITOR

Sometimes, svk needs to pop up a text editor. svk first tries to launch
the editor specified in $SVN_EDITOR and falls back to $EDITOR if that's
not defined.


=item $SVKDIFF

If you'd prefer to use an external "diff" tool instead of svk's builtin
diff library, set this variable to your tool's name or path.

=item $SVKMERGE

svk lets you resolve conflicts, interactively, with a text editor or
use an external diff tool.  Out of the box, svk comes with support for
the following merge tools:

 AraxisMerge
 Emacs
 FileMerge
 GtkDiff
 Guiffy
 GVim
 KDiff3
 Meld
 P4WinMerge
 TkDiff
 TortoiseMerge
 Vim
 WinMerge
 XXDiff

If you want svk to spawn a specific merge tool, set this variable to
the tool's name.

=item $SVKLOGLEVEL

The lowest log level that svk will present to the user. The log levels
are: DEBUG, INFO, WARN, ERROR and FATAL. The default log level is INFO;
this includes progress messages for long-running commands (such as
sync). For non-interactive use (such as for cron jobs) it might be
useful to set $SVKLOGLEVEL to WARN.

=item $SVKRESOLVE

If you set this variable, svk's interactive resolver will I<always>
perform the command it's set to. For more details about the commands
available in svk's interactive resolver, type C<perldoc SVK::Resolve>.

=item $SVKMIME

Indicates which module is used for automatically detecting the MIME types of
files.  Implementations included with core SVK are: "File::LibMagic",
"File::MMagic", "File::Type" and "Internal".  The value "Internal" means to use
SVK's own internal MIME detection algorithm which requires no external modules.
This poor, but fast algorithm simply assigns "application/octet-stream" to
anything that looks binary.  If $SVKMIME has no value, "Internal" is used.

=item $SVKPAGER

When svk needs to pipe long output through a pager, it uses $SVKPAGER
to send the output to your display.  If this variable is not set or set
to something that's not executable, the output will not be paged.  svk
ignores your $PAGER setting, so you must explicitly set $SVKPAGER if
you want paging.

=item $SVKLOGOUTPUT

By specifying this variable, you change the default output filter used by the
C<svk log> command.  The value of this variable can be anything that you can
pass to C<svk log>'s C<--output> option.

=item SVKBATCHMODE

When you set this variable to a true value, SVK should never prompt the user for an 
interactive response. 


=item $SVNFSTYPE

By default, svk creates its local repository as a B<fsfs> repository when
running on Subversion 1.1 and newer. On Subversion 1.0, SVK defaults
to B<bdb>.  To explicitly specify a repository type, set this variable
to B<fsfs> or B<bdb>.

=item $SVKNORAREPLAY

By default, svk tries to make use of the replay api provided by
Subversion if available.  You can turn this environment variable on to
tell svk not to do so.  svk will then use the old C<SVN::Mirror>
module to do mirroring.

=item $SVKSVNBACKTRACE

(For debugging use only.) If this environment variable is set to a
true value, any error message which comes from the Subversion
libraries will be accompanied by a stack backtrace.

=item $SVKPGP

svk supports the verification of historical changesets using the Gnu Privacy 
Guard. Note that SVK no longer allows users to sign new changesets.
By default, svk tries to run the first program called B<gpg> in your
path. To tell svk to use a specific gpg executable, set this variable
to the executable's name or path.

=back

=head2 Win32

These variables only apply to svk on Windows.

=over

=item $ProgramFiles

Set this variable to the directory you install programs into. It defaults
to 'C:\Program Files'.

=back

=cut