fix backtrace printed when cannot get lock.
change lock error handling code so exceptions have useful info and
exception handling in one place.
add test case for when cannot get lock.
#!/bin/sh
cat <<'EOF' > merge
#!/bin/sh
echo merging for `basename $1`
EOF
chmod +x merge
HGMERGE=./merge; export HGMERGE
mkdir A1
cd A1
hg init
echo This is file foo1 > foo
echo This is file bar1 > bar
hg add foo bar
hg commit -m "commit text" -d "1000000 0"
cd ..
hg clone A1 B1
cd A1
rm bar
hg remove bar
hg commit -m "commit test" -d "1000000 0"
cd ../B1
echo This is file foo22 > foo
hg commit -m "commit test" -d "1000000 0"
cd ..
hg clone A1 A2
hg clone B1 B2
cd A1
hg pull ../B1
hg update -m
hg commit -m "commit test" -d "1000000 0"
echo bar should remain deleted.
hg manifest
cd ../B2
hg pull ../A2
hg update -m
hg commit -m "commit test" -d "1000000 0"
echo bar should remain deleted.
hg manifest