interfaces: introduce and use a protocol class for the `charencoding` module
See
f2832de2a46c for details when this was done for the `bdiff` module.
This lets us dump the hack where the `pure` implementation was imported during
the type checking phase to provide signatures for the module methods it
provides. Now the protocol classes are starting to shine, because these methods
are provided by `pure.charencoding` and `cext.parsers`, and references to
`cffi.charencoding` and `cext.charencoding` are forwarded to them as appropriate
by the `policy` module. But none of that matters, as long as the module
returned provides the listed methods.
The interface was copy/pasted from the `pure` module, but `jsonescapeu8fallback`
is omitted because it is accessed from the `pure` module directly when the
escaping fails in the primary module's `jsonescapeu8()`.
#!/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
printusage () {
echo "usage: `basename $0` REPO NBHEADS DEPTH [left|right]" >&2
}
if [ $# -lt 3 ]; then
printusage
exit 64
fi
repo="$1"
shift
nbheads="$1"
shift
depth="$1"
shift
doleft=1
doright=1
if [ $# -gt 1 ]; then
printusage
exit 64
elif [ $# -eq 1 ]; then
if [ "$1" == "left" ]; then
doleft=1
doright=0
elif [ "$1" == "right" ]; then
doleft=0
doright=1
else
printusage
exit 64
fi
fi
leftrepo="${repo}-${nbheads}h-${depth}d-left"
rightrepo="${repo}-${nbheads}h-${depth}d-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 '### creating left/right repositories with missing changesets:'
if [ $doleft -eq 1 ]; then
echo '# left revset:' '"'${leftsubset}'"'
fi
if [ $doright -eq 1 ]; then
echo '# right revset:' '"'${rightsubset}'"'
fi
buildone() {
side="$1"
dest="$2"
revset="$3"
echo "### building $side repository: $dest"
if [ -e "$dest" ]; then
echo "destination repo already exists: $dest" >&2
exit 1
fi
echo '# cloning'
if ! cp --recursive --reflink=always ${repo} ${dest}; then
hg clone --noupdate "${repo}" "${dest}"
fi
echo '# stripping' '"'${revset}'"'
hg -R "${dest}" --config extensions.strip= strip --rev "$revset" --no-backup
}
if [ $doleft -eq 1 ]; then
buildone left "$leftrepo" "$leftsubset"
fi
if [ $doright -eq 1 ]; then
buildone right "$rightrepo" "$rightsubset"
fi