prepush: rewrite most of the code from scratch
For servers with branchmap support, the algorithm now works as follows:
1. A list of branches in outgoing changesets is created.
2. Using the remote branchmap, a check for new branches is performed.
3. A map (from branch to head list) of locally known remote heads before
the push is created, and one which, after step 4, will contain the locally
known remote heads after the push.
4. The post-push head map is updated with the outgoing changesets, using the
branch cache update mechanism.
5. A check for new heads is performed, by comparing the length of the head list
before and after push, for each branch. If there are new heads, an error
depending on whether or not there are incoming changes on the branch,
is returned.
6. If the push is allowed, a warning is written if there are incoming changes
on any branches involved in the push.
For old servers, an algorithm similar to step 4-6 above is used to check for
new topological heads only.
Two bugs are also fixed:
1. Sometimes you would be allowed to push new branch heads without --force.
A test for this case was added.
2. You would get the "note: unsynced remote changes!" warning if there were any
incoming changesets, even if they were on unrelated branches.
#!/bin/sh
# test that we don't interrupt the merge session if
# a file-level merge failed
hg init repo
cd repo
echo foo > foo
echo a > bar
hg ci -Am 'add foo'
hg mv foo baz
echo b >> bar
echo quux > quux1
hg ci -Am 'mv foo baz'
hg up -qC 0
echo >> foo
echo c >> bar
echo quux > quux2
hg ci -Am 'change foo'
# test with the rename on the remote side
HGMERGE=false hg merge
hg resolve -l
# test with the rename on the local side
hg up -C 1
HGMERGE=false hg merge
echo % show unresolved
hg resolve -l
echo % unmark baz
hg resolve -u baz
echo % show
hg resolve -l
hg st
echo % re-resolve baz
hg resolve baz
echo % after
hg resolve -l
echo % resolve all warning
hg resolve
echo % resolve all
hg resolve -a
echo % after
hg resolve -l
true