Fix how setup.py identifies the Mercurial version.
There is a problem with setup.py where it will not identify the Mercurial
version properly when not being ran in within a repository even if
mercurial/__version__.py exists.
To fix, use mercurial.__version__.version when available before defaulting
to "unknown". (Using mercurial.util.version() is not an option due to a
dependency issue where osutil can be referenced before it is built.)
#!/bin/sh
hg init repo
cd repo
echo foo > foo
echo bar > bar
hg ci -qAm 'add foo bar'
echo foo2 >> foo
echo bleh > bar
hg ci -m 'change foo bar'
hg up -qC 0
hg mv foo foo1
echo foo1 > foo1
hg cat foo >> foo1
hg ci -m 'mv foo foo1'
hg merge
hg debugstate --nodates
hg st -q
echo '% removing foo1 and bar'
cp foo1 F
cp bar B
hg rm -f foo1 bar
hg debugstate --nodates
hg st -qC
echo '% readding foo1 and bar'
cp F foo1
cp B bar
hg add -v foo1 bar
hg debugstate --nodates
hg st -qC
echo '% reverting foo1 and bar'
hg revert -vr . foo1 bar
hg debugstate --nodates
hg st -qC
hg diff