localrepo: refactor prepush logic
Simplifies the prepush check logic and makes it a lot more direct and
comprehensible. Instead of comparing the total local vs. remote head count, it
compares the number of new vs. removed heads.
% prepare repo1
adding a
% share it
updating working directory
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
% contents of repo2/.hg
pass: .hg/store does not exist
$HGTMP/test-share/repo1/.hg
% commit in shared clone
% check original
changeset: 1:8af4dc49db9e
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: change in shared clone
changeset: 0:d3873e73d99e
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: init
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
a
a
% commit in original
adding b
% check in shared clone
changeset: 2:c2e0ac586386
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: another file
changeset: 1:8af4dc49db9e
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: change in shared clone
changeset: 0:d3873e73d99e
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: init
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
b
% hg serve shared clone
200 Script output follows
-rw-r--r-- 4 a
-rw-r--r-- 2 b