contrib/dumprevlog

phabricator: add a `phabimport` command

I've had `alias.phabimport = $hg phabread --stack $1 | $hg import --bypass -`
for a while now, and I suspect others do too.  That's limited though, in that it
can't use the information on Phabricator to restore it in the original location,
so I'm making it a first class command.

This doesn't do anything ambitious like that- this is mostly a simplification of
`hg import` to get the equivalent of the alias mentioned above.  The `--bypass`
option is hardcoded to be enabled and the message about amending rejects
dropped (rejects aren't created with `--bypass`), because editing patches on
Phabricator seems like an unusual workflow.

This will need other options, like `--obsolete` and `--secret`.  I think these
would be more useful as config settings, as I imagine the workflows are pretty
fixed depending on roles.  Reviewers who don't queue patches probably never want
`--obsolete`, but may need `--secret`.  Reviewers who do will want the former,
but not the latter.  I left `--stack` as an option, but that should probably be
a config knob too (or at least default to on)- if the point of this is to avoid
rejects, it doesn't make sense to skip dependencies in most cases.

Evolve is going to need a fix to its wrapping of `cmdutil.tryimportone()`, as it
currently assumes `opts` has an `obsolete` key.  It's worked around for now.

Differential Revision: https://phab.mercurial-scm.org/D8136

#!/usr/bin/env python
# Dump revlogs as raw data stream
# $ find .hg/store/ -name "*.i" | xargs dumprevlog > repo.dump

from __future__ import absolute_import, print_function

import sys
from mercurial import (
    encoding,
    node,
    pycompat,
    revlog,
)
from mercurial.utils import procutil

for fp in (sys.stdin, sys.stdout, sys.stderr):
    procutil.setbinary(fp)


def binopen(path, mode=b'rb'):
    if b'b' not in mode:
        mode = mode + b'b'
    return open(path, pycompat.sysstr(mode))


binopen.options = {}


def printb(data, end=b'\n'):
    sys.stdout.flush()
    pycompat.stdout.write(data + end)


for f in sys.argv[1:]:
    r = revlog.revlog(binopen, encoding.strtolocal(f))
    print("file:", f)
    for i in r:
        n = r.node(i)
        p = r.parents(n)
        d = r.revision(n)
        printb(b"node: %s" % node.hex(n))
        printb(b"linkrev: %d" % r.linkrev(i))
        printb(b"parents: %s %s" % (node.hex(p[0]), node.hex(p[1])))
        printb(b"length: %d" % len(d))
        printb(b"-start-")
        printb(d)
        printb(b"-end-")