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#!/bin/bash
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#
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# produces two repositories with different common and missing subsets
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#
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# $ discovery-helper.sh REPO NBHEADS DEPT
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#
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# The Goal is to produce two repositories with some common part and some
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# exclusive part on each side. Provide a source repository REPO, it will
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# produce two repositories REPO-left and REPO-right.
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#
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# Each repository will be missing some revisions exclusive to NBHEADS of the
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# repo topological heads. These heads and revisions exclusive to them (up to
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# DEPTH depth) are stripped.
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#
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# The "left" repository will use the NBHEADS first heads (sorted by
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# description). The "right" use the last NBHEADS one.
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#
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# To find out how many topological heads a repo has, use:
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#
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# $ hg heads -t -T '{rev}\n' | wc -l
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#
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# Example:
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#
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# The `pypy-2018-09-01` repository has 192 heads. To produce two repositories
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# with 92 common heads and ~50 exclusive heads on each side.
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#
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# $ ./discovery-helper.sh pypy-2018-08-01 50 10
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set -euo pipefail
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printusage () {
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echo "usage: `basename $0` REPO NBHEADS DEPTH [left|right]" >&2
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}
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if [ $# -lt 3 ]; then
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printusage
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exit 64
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fi
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repo="$1"
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shift
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nbheads="$1"
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shift
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depth="$1"
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shift
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doleft=1
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doright=1
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if [ $# -gt 1 ]; then
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printusage
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exit 64
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elif [ $# -eq 1 ]; then
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if [ "$1" == "left" ]; then
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doleft=1
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doright=0
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elif [ "$1" == "right" ]; then
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doleft=0
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doright=1
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else
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printusage
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exit 64
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fi
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fi
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leftrepo="${repo}-${nbheads}h-${depth}d-left"
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rightrepo="${repo}-${nbheads}h-${depth}d-right"
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left="first(sort(heads(all()), 'desc'), $nbheads)"
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right="last(sort(heads(all()), 'desc'), $nbheads)"
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leftsubset="ancestors($left, $depth) and only($left, heads(all() - $left))"
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rightsubset="ancestors($right, $depth) and only($right, heads(all() - $right))"
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echo '### creating left/right repositories with missing changesets:'
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if [ $doleft -eq 1 ]; then
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echo '# left revset:' '"'${leftsubset}'"'
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fi
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if [ $doright -eq 1 ]; then
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echo '# right revset:' '"'${rightsubset}'"'
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fi
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buildone() {
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side="$1"
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dest="$2"
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revset="$3"
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echo "### building $side repository: $dest"
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if [ -e "$dest" ]; then
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echo "destination repo already exists: $dest" >&2
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exit 1
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fi
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echo '# cloning'
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if ! cp --recursive --reflink=always ${repo} ${dest}; then
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hg clone --noupdate "${repo}" "${dest}"
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fi
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echo '# stripping' '"'${revset}'"'
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hg -R "${dest}" --config extensions.strip= strip --rev "$revset" --no-backup
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}
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if [ $doleft -eq 1 ]; then
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buildone left "$leftrepo" "$leftsubset"
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fi
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if [ $doright -eq 1 ]; then
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buildone right "$rightrepo" "$rightsubset"
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fi
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