tests/test-remotenames.t

remotenames: add functionality to store remotenames under .hg/hgremotenames/

This patch moves the functionality from remotenames extension to store
remotenames to core.

Storage format used by remotenames extension:

A single file `.hg/remotenames` with an entry in each line where each line is of
format:
`node nametype remotepath/name`
where nametype is either 'bookmarks' or 'branches'.

This was not the best way to store data, so while moving to core the storage
format was changed but yet not the final format. The storage format used by core
after this patch will be:

* A file for each type of name i.e. bookmarks and branches in .hg/remotenames/
  directory
* A version number on the top of the file. The version for current format is 0.
* An entry in each line where each line is of the format
`node\0remotepath\0name`

The logic to sync with existing remotenames file and saving journals and other
related things will be moved to core in next patches incrementally.

Thanks to Ryan, Augie and Durham for suggestions on storage format.

Previously reviewed as D939.

Differential Revision: https://phab.mercurial-scm.org/D1548

Testing the functionality to pull remotenames
=============================================

  $ cat >> $HGRCPATH << EOF
  > [alias]
  > glog = log -G -T '{rev}:{node|short}  {desc}'
  > EOF

Making a server repo
--------------------

  $ hg init server
  $ cd server
  $ for ch in {a..h}; do echo "foo" >> $ch; hg ci -Aqm "Added "$ch; done
  $ hg glog
  @  7:ec2426147f0e  Added h
  |
  o  6:87d6d6676308  Added g
  |
  o  5:825660c69f0c  Added f
  |
  o  4:aa98ab95a928  Added e
  |
  o  3:62615734edd5  Added d
  |
  o  2:28ad74487de9  Added c
  |
  o  1:29becc82797a  Added b
  |
  o  0:18d04c59bb5d  Added a
  
  $ hg bookmark -r 3 foo
  $ hg bookmark -r 6 bar
  $ hg up 4
  0 files updated, 0 files merged, 3 files removed, 0 files unresolved
  $ hg branch wat
  marked working directory as branch wat
  (branches are permanent and global, did you want a bookmark?)
  $ echo foo >> bar
  $ hg ci -Aqm "added bar"

Making a client repo
--------------------

  $ cd ..
  $ hg init client
  $ cd client
  $ cat >> .hg/hgrc << EOF
  > [experimental]
  > remotenames = True
  > EOF

  $ hg pull ../server/
  pulling from ../server/
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 9 changesets with 9 changes to 9 files (+1 heads)
  adding remote bookmark bar
  adding remote bookmark foo
  new changesets 18d04c59bb5d:3e1487808078
  (run 'hg heads' to see heads)

  $ cat .hg/remotenames/bookmarks
  0
  
  87d6d66763085b629e6d7ed56778c79827273022\x00file:$TESTTMP/server\x00bar (esc)
  62615734edd52f06b6fb9c2beb429e4fe30d57b8\x00file:$TESTTMP/server\x00foo (esc)

  $ cat .hg/remotenames/branches
  0
  
  ec2426147f0e39dbc9cef599b066be6035ce691d\x00file:$TESTTMP/server\x00default (esc)
  3e1487808078543b0af6d10dadf5d46943578db0\x00file:$TESTTMP/server\x00wat (esc)