merge: do early copy to deal with issue636
Without copies/renames, merges source names are 1:1 with their
targets. Copies and renames introduce the possibility that there will
be two merges with the same input but different output. By doing the
copy to the destination name before the merge, the actual merge
becomes 1:1 again, and no source is the input to two different merges.
- add a preliminary scan to applyupdates to do copies
- for the merge action, pass the old name (for finding ancestors) and
the new name (for input to the merge) to filemerge
- eliminate the old post-merge copy
- lookup file contents from new name in filemerge
- pass new name to external merge helper
- report merge failure at new name
- add a test
#!/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"