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
echo % prepare repo
hg init
echo "some text" > FOO.txt
echo "another text" > bar.txt
echo "more text" > QUICK.txt
hg add
hg ci -d '0 0' -mtest1
echo
echo % verify
hg verify
echo
echo % introduce some bugs in repo
cd .hg/store/data
mv _f_o_o.txt.i X_f_o_o.txt.i
mv bar.txt.i xbar.txt.i
rm _q_u_i_c_k.txt.i
echo
echo % verify
hg verify
exit 0