annotate tests/test-mq-caches @ 5378:8a2915f57dfc

convert: add a mode where mercurial_sink skips empty revisions.

The getchanges function of some converter_source classes can return
some false positives.  I.e. they sometimes claim that a file "foo"
was changed in some revision, even though its contents are still the
same.

convert_svn is particularly bad, but I think this can also happen with
convert_cvs and, at least in theory, with mercurial_source.

For regular conversions this is not really a problem - as long as
getfile returns the right contents, we'll get a converted revision
with the right contents.  But when we use --filemap, this could lead
to superfluous revisions being converted.

Instead of fixing every converter_source, I decided to change
mercurial_sink to work around this problem.

When --filemap is used, we're interested only in revisions that touch
some specific files.  If a revision doesn't change any of these files,
then we're not interested in it (at least for revisions with a single
parent; merges are special).

For mercurial_sink, we abuse this property and rollback a commit if
the manifest text hasn't changed.  This avoids duplicating the logic
from localrepo.filecommit to detect unchanged files.

#!/bin/sh

echo '[extensions]' >> $HGRCPATH
echo 'hgext.mq=' >> $HGRCPATH

show_branch_cache()
{
    branches=.hg/branch.cache
    # force cache (re)generation
    hg log -r does-not-exist 2> /dev/null
    hg log -r tip --template 'tip: #rev#\n'
    if [ -f $branches ]; then
	sort $branches
    else
	echo No $branches
    fi
    if [ "$1" = 1 ]; then
	for b in foo bar; do
	    hg log -r $b --template "branch $b: "'#rev#\n'
	done
    fi
}

hg init a
cd a
hg qinit -c

echo '# mq patch on an empty repo'
hg qnew p1
show_branch_cache

echo > pfile
hg add pfile
hg qrefresh -m 'patch 1'
show_branch_cache

echo
echo '# some regular revisions'
hg qpop
echo foo > foo
hg add foo
echo foo > .hg/branch
hg ci -m 'branch foo' -d '1000000 0'

echo bar > bar
hg add bar
echo bar > .hg/branch
hg ci -m 'branch bar' -d '1000000 0'
show_branch_cache

echo
echo '# add some mq patches'
hg qpush
show_branch_cache

hg qnew p2
echo foo > .hg/branch
echo foo2 >> foo
hg qrefresh -m 'patch 2'
show_branch_cache 1

echo
echo '# removing the cache'
rm .hg/branch.cache
show_branch_cache 1

echo
echo '# importing rev 1 (the cache now ends in one of the patches)'
hg qimport -r 1 -n p0
show_branch_cache 1
hg log -r qbase --template 'qbase: #rev#\n'

echo
echo '# detect an invalid cache'
hg qpop -a
hg qpush -a
show_branch_cache