extend network protocol to stop clients from locking servers
now all repositories have capabilities slot, tuple with list of names.
if 'unbundle' capability present, repo supports push where client does
not need to lock server. repository classes that have unbundle capability
also have unbundle method.
implemented for ssh now, will be base for push over http.
unbundle protocol acts this way. server tells client what heads it
has during normal negotiate step. client starts unbundle by repeat
server's heads back to it. if server has new heads, abort immediately.
otherwise, transfer changes to server. once data transferred, server
locks and checks heads again. if heads same, changes can be added.
else someone else added heads, and server aborts.
if client wants to force server to add heads, sends special heads list of
'force'.
#!/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 -v | 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