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
hg init t
cd t
hg branches
echo foo > a
hg add a
hg ci -m "initial" -d "1000000 0"
hg branch foo
hg branch
hg ci -m "add branch name" -d "1000000 0"
hg branch bar
hg ci -m "change branch name" -d "1000000 0"
echo % branch shadowing
hg branch default
hg branch -f default
hg ci -m "clear branch name" -d "1000000 0"
hg co foo
hg branch
echo bleah > a
hg ci -m "modify a branch" -d "1000000 0"
hg merge
hg branch
hg ci -m "merge" -d "1000000 0"
hg log
hg branches
hg branches -q
echo % test for invalid branch cache
hg rollback
cp .hg/branch.cache .hg/bc-invalid
hg log -r foo
cp .hg/bc-invalid .hg/branch.cache
hg --debug log -r foo
rm .hg/branch.cache
echo corrupted > .hg/branch.cache
hg log -qr foo
cat .hg/branch.cache
echo % update with no arguments: tipmost revision of the current branch
hg up -q -C 0
hg up -q
hg id
hg up -q 1
hg up -q
hg id
hg branch foobar
hg up
echo % fastforward merge
hg branch ff
echo ff > ff
hg ci -Am'fast forward' -d '1000000 0'
hg up foo
hg merge ff
hg branch
hg commit -m'Merge ff into foo' -d '1000000 0'
hg parents
hg manifest
exit 0