revisionbranchcache: fall back to slow path if starting readonly (issue4531)
Transitioning to Mercurial versions with revision branch cache could be slow as
long as all operations were readonly (revset queries) and the cache would be
populated but not written back.
Instead, fall back to using the consistently slow path when readonly and the
cache doesn't exist yet. That avoids the overhead of populating the cache
without writing it back.
If not readonly, it will still populate all missing entries initially. That
avoids repeated writing of the cache file with small updates, and it also makes
sure a fully populated cache available for the readonly operations.
#require darcs
$ echo "[extensions]" >> $HGRCPATH
$ echo "convert=" >> $HGRCPATH
$ DARCS_EMAIL='test@example.org'; export DARCS_EMAIL
initialize darcs repo
$ mkdir darcs-repo
$ cd darcs-repo
$ darcs init
$ echo a > a
$ darcs record -a -l -m p0
Finished recording patch 'p0'
$ cd ..
branch and update
$ darcs get -q darcs-repo darcs-clone >/dev/null
$ cd darcs-clone
$ echo c >> a
$ echo c > c
$ darcs record -a -l -m p1.1
Finished recording patch 'p1.1'
$ cd ..
skip if we can't import elementtree
$ if hg convert darcs-repo darcs-dummy 2>&1 | grep ElementTree > /dev/null; then
> echo 'skipped: missing feature: elementtree module'
> exit 80
> fi
update source
$ cd darcs-repo
$ echo b >> a
$ echo b > b
$ darcs record -a -l -m p1.2
Finished recording patch 'p1.2'
$ darcs pull -q -a --no-set-default ../darcs-clone
Backing up ./a(*) (glob)
We have conflicts in the following files:
./a
$ sleep 1
$ echo e > a
$ echo f > f
$ mkdir dir
$ echo d > dir/d
$ echo d > dir/d2
$ darcs record -a -l -m p2
Finished recording patch 'p2'
test file and directory move
$ darcs mv f ff
Test remove + move
$ darcs remove dir/d2
$ rm dir/d2
$ darcs mv dir dir2
$ darcs record -a -l -m p3
Finished recording patch 'p3'
The converter does not currently handle patch conflicts very well.
When they occur, it reverts *all* changes and moves forward,
letting the conflict resolving patch fix collisions.
Unfortunately, non-conflicting changes, like the addition of the
"c" file in p1.1 patch are reverted too.
Just to say that manifest not listing "c" here is a bug.
$ cd ..
$ hg convert darcs-repo darcs-repo-hg
initializing destination darcs-repo-hg repository
scanning source...
sorting...
converting...
4 p0
3 p1.2
2 p1.1
1 p2
0 p3
$ hg log -R darcs-repo-hg -g --template '{rev} "{desc|firstline}" ({author}) files: {files}\n' "$@"
4 "p3" (test@example.org) files: dir/d dir/d2 dir2/d f ff
3 "p2" (test@example.org) files: a dir/d dir/d2 f
2 "p1.1" (test@example.org) files:
1 "p1.2" (test@example.org) files: a b
0 "p0" (test@example.org) files: a
$ hg up -q -R darcs-repo-hg
$ hg -R darcs-repo-hg manifest --debug
7225b30cdf38257d5cc7780772c051b6f33e6d6b 644 a
1e88685f5ddec574a34c70af492f95b6debc8741 644 b
37406831adc447ec2385014019599dfec953c806 644 dir2/d
b783a337463792a5c7d548ad85a7d3253c16ba8c 644 ff
#if no-outer-repo
try converting darcs1 repository
$ hg clone -q "$TESTDIR/bundles/darcs1.hg" darcs
$ hg convert -s darcs darcs/darcs1 2>&1 | grep darcs-1.0
darcs-1.0 repository format is unsupported, please upgrade
#endif