rust-revlog: fix RevlogEntry.data() for NULL_REVISION
Before this change, the pseudo-entry returned by `Revlog.get_entry` for
`NULL_REVISION` would trigger errors in application code using it.
For example, this fixes a crash spotted with changelog data
while implementing RHGitaly: `Changelog.data_for_rev(-1)` was already
returning the pseudo content as expected, e.g., for `hg log`, but
`Changelog.entry_for_rev(-1).data()` would still crash with
"corrupted revlog, hash check failed for revision -1". There is
an added test for this scenario.
import os
from mercurial.hgweb import hgwebdir_mod
hgwebdir = hgwebdir_mod.hgwebdir
os.mkdir(b'webdir')
os.chdir(b'webdir')
webdir = os.path.realpath(b'.')
def trivial_response(req, res):
return []
def make_hgwebdir(gc_rate=None):
config = os.path.join(webdir, b'hgwebdir.conf')
with open(config, 'wb') as configfile:
configfile.write(b'[experimental]\n')
if gc_rate is not None:
configfile.write(b'web.full-garbage-collection-rate=%d\n' % gc_rate)
hg_wd = hgwebdir(config)
hg_wd._runwsgi = trivial_response
return hg_wd
def process_requests(webdir_instance, number):
# we don't care for now about passing realistic arguments
for _ in range(number):
for chunk in webdir_instance.run_wsgi(None, None):
pass
without_gc = make_hgwebdir(gc_rate=0)
process_requests(without_gc, 5)
assert without_gc.requests_count == 5
assert without_gc.gc_full_collections_done == 0
with_gc = make_hgwebdir(gc_rate=2)
process_requests(with_gc, 5)
assert with_gc.requests_count == 5
assert with_gc.gc_full_collections_done == 2
with_systematic_gc = make_hgwebdir() # default value of the setting
process_requests(with_systematic_gc, 3)
assert with_systematic_gc.requests_count == 3
assert with_systematic_gc.gc_full_collections_done == 3