narrow: send specs as bundle2 data instead of param (issue5952) (issue6019) Before this patch, when ACL is involved, narrowspecs are send as bundle2 parameter for narrow:spec bundle2 part. The limitation of bundle2 parts are they cannot send data larger than 255 bytes. Includes and excludes in narrow are not limited by size and they can grow over 255 bytes. This patch introduces a new mandatory bundle2 part and send narrowspecs as data of that. The new bundle2 part is introduced to keep things cleaner and easy to distinguish related to backward compatibility. The part is mandatory because without server's narrowspec, the local ACL narrow repo won't work. This patch makes clients compatible with servers which have older versions. However I left a comment that we should drop the other bundle2 part soon as that's broken and people should not rely on that. I named the new bundle2 part 'Narrow:responsespec' because: 1) Capital 'N' to make it mandatory 2) 'Narrow:spec' cannot be used because bundle2 enforces that there should not be two different parts which resolve to same name when lowercased. 3) reponsespec clears that they are specs which are send as reponse by the server While I was here, I renamed `narrowhgacl` section to `narrowacl` as suggested by idlsoft@ and martinvonz@. Differential Revision: https://phab.mercurial-scm.org/D6310

Make a narrow clone then archive it
  $ . "$TESTDIR/narrow-library.sh"

  $ hg init master
  $ cd master

  $ for x in `$TESTDIR/seq.py 3`; do
  >   echo $x > "f$x"
  >   hg add "f$x"
  >   hg commit -m "Add $x"
  > done
  $ cat >> .hg/hgrc << EOF
  > [narrowacl]
  > default.includes=f1 f2
  > EOF
  $ hg serve -a localhost -p $HGPORT1 -d --pid-file=hg.pid
  $ cat hg.pid >> "$DAEMON_PIDS"

  $ cd ..
  $ hg clone http://localhost:$HGPORT1 narrowclone1
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 2 changes to 2 files
  new changesets * (glob)
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved

The clone directory should only contain f1 and f2
  $ ls -1 narrowclone1 | sort
  f1
  f2

Requirements should contain narrowhg
  $ cat narrowclone1/.hg/requires | grep narrowhg
  narrowhg-experimental

NarrowHG should track f1 and f2
  $ hg -R narrowclone1 tracked
  I path:f1
  I path:f2