tests/test-subrepo-paths.out

subrepos: support remapping of .hgsub source paths

Given a .hgsub file containing

  lib/libfoo = http://server/libfoo

the 'lib/libfoo' subrepo will be cloned from 'http://server/libfoo'.

This changeset introduces a remapping mechanism whereby the source
paths (the right-hand sides) in the .hgsub file can be remapped. This
subpaths section

  [subpaths]
  http://server = /local

will result in the 'lib/libfoo' subrepo being cloned from
'/local/libfoo' instead of from 'http://server/libfoo'.

The patterns (left-hand sides) are really regular expressions and the
replacement strings (right-hand sides) can refer to matched groups
using normal backreferences. This can be used for more complicated
replacements such as

  [subpaths]
  http://server/(.*)-hg/ = http://hg.server/\1/

which replaces 'http://server/foo-hg/' with 'http://hg.server/foo/'.

All patterns are applied in the order by which they are listed in the
config files.

% hg debugsub with no remapping
path sub
 source   http://example.net/libfoo
 revision 
% hg debugsub with remapping
path sub
 source   ssh://localhost/libfoo
 revision 
% test bad subpaths pattern
abort: bad subrepository pattern in $HGTMP/test-subrepo-paths/outer/.hg/hgrc:2: invalid group reference