annotate contrib/discovery-helper.sh @ 41426:02d0a7774882

py3: byteify the LFS blobstore module

This is almost entirely b'' prefixing, with a couple of exceptions forced to
bytes.  Much of this is also borrowed from Augie's code.  There's an
HTTPError.read() that I flagged that I assume needs to be converted to bytes,
but I can't find confirmation.

Handling the deserialized JSON object over several functions made r'' vs b''
accesses confusing, so this assumes that the JSON object will be converted to
bytes immediately.  That will be done in the following commits, so it's not
buried in these trivial changes.

#!/bin/bash
#
# produces two repositories with different common and missing subsets
#
#   $ discovery-helper.sh REPO NBHEADS DEPT
#
# The Goal is to produce two repositories with some common part and some
# exclusive part on each side. Provide a source repository REPO, it will
# produce two repositories REPO-left and REPO-right.
#
# Each repository will be missing some revisions exclusive to NBHEADS of the
# repo topological heads. These heads and revisions exclusive to them (up to
# DEPTH depth) are stripped.
#
# The "left" repository will use the NBHEADS first heads (sorted by
# description). The "right" use the last NBHEADS one.
#
# To find out how many topological heads a repo has, use:
#
#   $ hg heads -t -T '{rev}\n' | wc -l
#
# Example:
#
#  The `pypy-2018-09-01` repository has 192 heads. To produce two repositories
#  with 92 common heads and ~50 exclusive heads on each side.
#
#    $ ./discovery-helper.sh pypy-2018-08-01 50 10

set -euo pipefail

if [ $# -lt 3 ]; then
     echo "usage: `basename $0` REPO NBHEADS DEPTH"
     exit 64
fi

repo="$1"
shift

nbheads="$1"
shift

depth="$1"
shift

leftrepo="${repo}-left"
rightrepo="${repo}-right"

left="first(sort(heads(all()), 'desc'), $nbheads)"
right="last(sort(heads(all()), 'desc'), $nbheads)"

leftsubset="ancestors($left, $depth) and only($left, heads(all() - $left))"
rightsubset="ancestors($right, $depth) and only($right, heads(all() - $right))"

echo '### building left repository:' $left-repo
echo '# cloning'
hg clone --noupdate "${repo}" "${leftrepo}"
echo '# stripping' '"'${leftsubset}'"'
hg -R "${leftrepo}" --config extensions.strip= strip --rev "$leftsubset" --no-backup

echo '### building right repository:' $right-repo
echo '# cloning'
hg clone --noupdate "${repo}" "${rightrepo}"
echo '# stripping:' '"'${rightsubset}'"'
hg -R "${rightrepo}" --config extensions.strip= strip --rev "$rightsubset" --no-backup