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
mkdir -p t
cd t
cat <<EOF > merge
import sys, os
f = open(sys.argv[1], "wb")
f.write("merge %s %s %s" % (sys.argv[1], sys.argv[2], sys.argv[3]))
f.close()
EOF
HGMERGE="python ../merge"; export HGMERGE
# perform a test merge with possible renaming
#
# args:
# $1 = action in local branch
# $2 = action in remote branch
# $3 = action in working dir
# $4 = expected result
tm()
{
mkdir t
cd t
hg init
echo "[merge]" >> .hg/hgrc
echo "followcopies = 1" >> .hg/hgrc
# base
echo base > a
echo base > rev # used to force commits
hg add a rev
hg ci -m "base" -d "0 0"
# remote
echo remote > rev
if [ "$2" != "" ] ; then $2 ; fi
hg ci -m "remote" -d "0 0"
# local
hg co -q 0
echo local > rev
if [ "$1" != "" ] ; then $1 ; fi
hg ci -m "local" -d "0 0"
# working dir
echo local > rev
if [ "$3" != "" ] ; then $3 ; fi
# merge
echo "--------------"
echo "test L:$1 R:$2 W:$3 - $4"
echo "--------------"
hg merge -y --debug --traceback
echo "--------------"
hg status -camC -X rev
hg ci -m "merge" -d "0 0"
echo "--------------"
echo
cd ..
rm -r t
}
up() {
cp rev $1
hg add $1 2> /dev/null
if [ "$2" != "" ] ; then
cp rev $2
hg add $2 2> /dev/null
fi
}
uc() { up $1; hg cp $1 $2; } # update + copy
um() { up $1; hg mv $1 $2; }
nc() { hg cp $1 $2; } # just copy
nm() { hg mv $1 $2; } # just move
tm "up a " "nc a b" " " "1 get local a to b"
tm "nc a b" "up a " " " "2 get rem change to a and b"
tm "up a " "nm a b" " " "3 get local a change to b, remove a"
tm "nm a b" "up a " " " "4 get remote change to b"
tm " " "nc a b" " " "5 get b"
tm "nc a b" " " " " "6 nothing"
tm " " "nm a b" " " "7 get b"
tm "nm a b" " " " " "8 nothing"
tm "um a b" "um a b" " " "9 do merge with ancestor in a"
#tm "um a c" "um x c" " " "10 do merge with no ancestor"
tm "nm a b" "nm a c" " " "11 get c, keep b"
tm "nc a b" "up b " " " "12 merge b no ancestor"
tm "up b " "nm a b" " " "13 merge b no ancestor"
tm "nc a b" "up a b" " " "14 merge b no ancestor"
tm "up b " "nm a b" " " "15 merge b no ancestor, remove a"
tm "nc a b" "up a b" " " "16 get a, merge b no ancestor"
tm "up a b" "nc a b" " " "17 keep a, merge b no ancestor"
tm "nm a b" "up a b" " " "18 merge b no ancestor"
tm "up a b" "nm a b" " " "19 merge b no ancestor, prompt remove a"
tm "up a " "um a b" " " "20 merge a and b to b, remove a"
tm "um a b" "up a " " " "21 merge a and b to b"
#tm "nm a b" "um x a" " " "22 get a, keep b"
tm "nm a b" "up a c" " " "23 get c, keep b"