evolve: add comptability to read old evolvestate files
When a user runs `hg evolve` with old evolve where we used to write evolvestate
the old ways i.e. without using cbor, and faces conflicts, the evolve is
interrupted. If the user updates evolve before completing the evolve, that can
result in traceback as the new evolve cannot read the old evolvestate file.
The previous patch added function to read old evolvestate file and this patch
uses that when we encounter the above mentioned case.
$ . ${TESTDIR}/testlib/pythonpath.sh
$ cat >> $HGRCPATH <<EOF
> [defaults]
> amend=-d "0 0"
> [web]
> push_ssl = false
> allow_push = *
> [phases]
> publish = False
> [experimental]
> bundle2-exp=False # < Mercurial-4.0
> [devel]
> legacy.exchange=bundle1
> [extensions]
> EOF
$ mkcommit() {
> echo "$1" > "$1"
> hg add "$1"
> hg ci -m "add $1"
> }
$ hg init server
Try the multiple ways to setup the extension
$ hg -R server log --config 'extensions.evolve.serveronly='
$ hg -R server log --config "extensions.evolve.serveronly=${SRCDIR}/hgext3rd/evolve/serveronly.py"
$ PYTHONPATH=$HGTEST_ORIG_PYTHONPATH hg -R server log --config "extensions.evolve.serveronly=${SRCDIR}/hgext3rd/evolve/serveronly.py"
setup repo
$ echo "[extensions]" >> ./server/.hg/hgrc
$ echo "evolve.serveronly=" >> ./server/.hg/hgrc
$ hg serve -R server -n test -p $HGPORT -d --pid-file=hg.pid -A access.log -E errors.log --traceback
$ cat hg.pid >> $DAEMON_PIDS
$ hg clone http://localhost:$HGPORT/ client
no changes found
updating to branch default
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cat ./errors.log
$ echo "[extensions]" >> ./client/.hg/hgrc
$ echo "evolve=" >> ./client/.hg/hgrc
$ cp -r client other
Smoke testing
===============
$ cd client
$ mkcommit 0
$ mkcommit a
$ hg push
pushing to http://localhost:$HGPORT/
searching for changes
abort: remote error:
incompatible Mercurial client; bundle2 required
(see https://www.mercurial-scm.org/wiki/IncompatibleClient)
[255]
$ cat ../errors.log