tests/test-up-issue1456

debugbuilddag: build a changelog dag from a concise description

Useful in tests to quickly build a complex DAG in an empty repo.
Handles local tags and named branches.
Options to, at each rev,
 - create a new file,
 - overwrite the same file,
 - append to the same file,
 - write to a specific line in a mergeable file.
Can run shell commands during DAG buildup.

#!/bin/sh

rm -rf a
hg init a
cd a

echo foo > foo
hg ci -qAm0
chmod +x foo
hg ci -m1
hg co -q 0
echo dirty > foo
hg up -c
hg up -q
cat foo
hg st -A

echo '% validate update of standalone execute bit change'
hg up -C 0
chmod -x foo
hg ci -m removeexec
hg up -C 0
hg up
hg st