branchcache: add a "pure topological head" fast path
In a narrow but actually quick common case, all topological heads are all on
the same branch and all open. In this case, computing the branch map is very
simple. We can quickly detect situation where this situation will not change.
So we update the V3 format to be able to express this situation and upgrade the
update code to detect we remains in that mode.
The branch cache is populated with the actual value when the branch map is
accessed, but the update_disk method can do the update without needing to
populate it.
#require serve
Some tests for hgweb responding to HEAD requests
$ hg init test
$ cd test
$ mkdir da
$ echo foo > da/foo
$ echo foo > foo
$ hg ci -Ambase
adding da/foo
adding foo
$ hg bookmark -r0 '@'
$ hg bookmark -r0 'a b c'
$ hg bookmark -r0 'd/e/f'
$ hg serve -n test -p $HGPORT -d --pid-file=hg.pid -A access.log -E errors.log
$ cat hg.pid >> $DAEMON_PIDS
manifest
$ get-with-headers.py localhost:$HGPORT --method=HEAD 'file/tip/?style=raw' - date etag server
200 Script output follows
content-type: text/plain; charset=ascii
$ get-with-headers.py localhost:$HGPORT --method=HEAD 'file/tip/da?style=raw' - date etag server
200 Script output follows
content-type: text/plain; charset=ascii
plain file
$ get-with-headers.py localhost:$HGPORT --method=HEAD 'file/tip/foo?style=raw' - date etag server
200 Script output follows
content-disposition: inline; filename="foo"
content-length: 4
content-type: application/binary
should give a 404 - static file that does not exist
$ get-with-headers.py localhost:$HGPORT --method=HEAD 'static/bogus' - date etag server
404 Not Found
content-type: text/html; charset=ascii
[1]
should give a 404 - bad revision
$ get-with-headers.py localhost:$HGPORT --method=HEAD 'file/spam/foo?style=raw' - date etag server
404 Not Found
content-type: text/plain; charset=ascii
[1]
should give a 400 - bad command
$ get-with-headers.py localhost:$HGPORT --method=HEAD 'file/tip/foo?cmd=spam&style=raw' - date etag server
400* (glob)
content-type: text/plain; charset=ascii
[1]
should give a 404 - file does not exist
$ get-with-headers.py localhost:$HGPORT --method=HEAD 'file/tip/bork?style=raw' - date etag server
404 Not Found
content-type: text/plain; charset=ascii
[1]
try bad style
$ get-with-headers.py localhost:$HGPORT --method=HEAD 'file/tip/?style=foobar' - date etag server
200 Script output follows
content-type: text/html; charset=ascii
log
$ get-with-headers.py localhost:$HGPORT --method=HEAD 'log?style=raw' - date etag server
200 Script output follows
content-type: text/plain; charset=ascii
access bookmarks
$ get-with-headers.py localhost:$HGPORT --method=HEAD 'rev/@?style=paper' - date etag server
200 Script output follows
content-type: text/html; charset=ascii
static file
$ get-with-headers.py localhost:$HGPORT --method=HEAD 'static/style-gitweb.css' - date etag server
200 Script output follows
content-length: 9074
content-type: text/css
$ killdaemons.py
$ cd ..