debugcommands: introduce debugpeer command
`hg debugpeer <path>` will establish a connection to a peer repository
and print information about it.
If you add --debug, it will log low-level protocol request info. This
will be useful for upcoming tests around protocol handshaking.
Differential Revision: https://phab.mercurial-scm.org/D2025
Just exercise debugindexdot
Create a short file history including a merge.
$ hg init t
$ cd t
$ echo a > a
$ hg ci -qAm t1 -d '0 0'
$ echo a >> a
$ hg ci -m t2 -d '1 0'
$ hg up -qC 0
$ echo b >> a
$ hg ci -m t3 -d '2 0'
created new head
$ HGMERGE=true hg merge -q
$ hg ci -m merge -d '3 0'
$ hg debugindexdot .hg/store/data/a.i
digraph G {
-1 -> 0
0 -> 1
0 -> 2
2 -> 3
1 -> 3
}
$ cd ..