Correct optimization from 3464f5e77f34; add a test.
If there are two (or more) heads that point to the same .hgtags
node, we can safely skip parsing the file in all but the last head.
(In 3464f5e77f34, we were parsing the file in the first head and
skipping all the others.)
#!/bin/sh
mkdir t
cd t
hg init
hg id
echo a > a
hg add a
hg commit -m "test" -d "1000000 0"
hg co
hg identify
T=`hg tip --debug | head -n 1 | cut -d : -f 3`
echo "$T first" > .hgtags
cat .hgtags
hg add .hgtags
hg commit -m "add tags" -d "1000000 0"
hg tags
hg identify
echo bb > a
hg status
hg identify
hg co first
hg id
hg -v id
hg status
echo 1 > b
hg add b
hg commit -m "branch" -d "1000000 0"
hg id
hg merge 1
hg id
hg status
hg commit -m "merge" -d "1000000 0"
# create fake head, make sure tag not visible afterwards
cp .hgtags tags
hg tag -d "1000000 0" last
hg rm .hgtags
hg commit -m "remove" -d "1000000 0"
mv tags .hgtags
hg add .hgtags
hg commit -m "readd" -d "1000000 0"
hg tags
# invalid tags
echo "spam" >> .hgtags
echo >> .hgtags
echo "foo bar" >> .hgtags
echo "$T invalid" | sed "s/..../a5a5/" >> .hg/localtags
hg commit -m "tags" -d "1000000 0"
# report tag parse error on other head
hg up 3
echo 'x y' >> .hgtags
hg commit -m "head" -d "1000000 0"
hg tags
hg tip
# tags from later heads override previous ones
cd ..
hg init t2
cd t2
echo foo > foo
hg add foo
hg ci -m 'add foo' -d '1000000 0' # rev 0
hg tag -d '1000000 0' bar # rev 1
echo >> foo
hg ci -m 'change foo 1' -d '1000000 0' # rev 2
hg up -C 1
hg tag -r 1 -d '1000000 0' bar # rev 3
hg up -C 1
echo >> foo
hg ci -m 'change foo 2' -d '1000000 0' # rev 4
hg tags