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Differential D9680

sharesafe: add functionality to automatically downgrade shares
ClosedPublic

Authored by pulkit on Jan 6 2021, 8:21 AM.

Details

Reviewers
marmoute
Alphare
Group Reviewers
hg-reviewers
Commits
rHGeec47efe219d: sharesafe: add functionality to automatically downgrade shares
Summary

Reasoning is same as previous patch which adds automatic upgrade support.

Downgrade is required as if automatic upgrade is enabled, all shares upgrade and
then source repository downgrades, shares won't work. We need to downgrade them.

Diff Detail

Repository
rHG Mercurial
Branch
default
Lint
No Linters Available
Unit
No Unit Test Coverage

Event Timeline

pulkit created this revision.Jan 6 2021, 8:21 AM
baymax updated this revision to Diff 24621.Jan 6 2021, 10:14 AM

✅ refresh by Heptapod after a successful CI run (🐙 💚)

marmoute requested changes to this revision.Jan 6 2021, 5:14 PM
marmoute added a subscriber: marmoute.

same feedback as D9679 ☺

This revision now requires changes to proceed.Jan 6 2021, 5:14 PM
pulkit updated this revision to Diff 24625.Jan 7 2021, 6:47 AM
baymax updated this revision to Diff 24631.Jan 8 2021, 7:56 AM

✅ refresh by Heptapod after a successful CI run (🐙 💚)

pulkit updated this revision to Diff 24644.Jan 8 2021, 11:24 AM
marmoute added a comment.Jan 8 2021, 6:11 PM

(I assume the same feedback apply there)

pulkit added a comment.Jan 9 2021, 6:27 AM
In D9680#146569, @marmoute wrote:

(I assume the same feedback apply there)

Yes, incorporated those already.

baymax updated this revision to Diff 24694.Jan 9 2021, 8:03 AM

✅ refresh by Heptapod after a successful CI run (🐙 💚)

Alphare accepted this revision.Jan 12 2021, 11:28 AM
pulkit updated this revision to Diff 24776.Jan 13 2021, 6:30 AM
pulkit added a commit: rHGeec47efe219d: sharesafe: add functionality to automatically downgrade shares.Jan 13 2021, 2:39 PM
This revision was not accepted when it landed; it landed in state Needs Review.
Closed by commit rHGeec47efe219d: sharesafe: add functionality to automatically downgrade shares (authored by pulkit). · Explain Why
This revision was automatically updated to reflect the committed changes.

Revision Contents
Changeset List

Diff 24621

mercurial/configitems.py

) )
coreconfigitem( coreconfigitem(
b'experimental', b'experimental',
b'server.stream-narrow-clones', b'server.stream-narrow-clones',
default=False, default=False,
) )
coreconfigitem( coreconfigitem(
b'experimental', b'experimental',
b'sharesafe-auto-downgrade-shares',
default=False,
)
coreconfigitem(
b'experimental',
b'sharesafe-auto-upgrade-shares', b'sharesafe-auto-upgrade-shares',
default=False, default=False,
) )
coreconfigitem( coreconfigitem(
b'experimental', b'experimental',
b'single-head-per-branch', b'single-head-per-branch',
default=False, default=False,
) )

mercurial/localrepo.py

# to be reshared # to be reshared
if requirementsmod.SHARESAFE_REQUIREMENT in requirements: if requirementsmod.SHARESAFE_REQUIREMENT in requirements:
if ( if (
shared shared
and requirementsmod.SHARESAFE_REQUIREMENT and requirementsmod.SHARESAFE_REQUIREMENT
not in _readrequires(sharedvfs, True) not in _readrequires(sharedvfs, True)
): ):
if ui.configbool(
b'experimental', b'sharesafe-auto-downgrade-shares'
):
sourcerequires = _readrequires(sharedvfs, True)
wlock = None
try:
wlock = lockmod.trylock(ui, hgvfs, b'wlock', 0, 0)
requirements = scmutil.downgrade_share_to_non_safe(
hgvfs, requirements, sourcerequires
)
ui.warn(
_(b'repository downgraded to not use share-safe mode\n')
)
except Exception as e:
ui.warn(
_(b'failed to downgrade share, got error: %s')
% stringutil.forcebytestr(e)
)
finally:
if wlock:
wlock.release()
else:
raise error.Abort( raise error.Abort(
_(b"share source does not support exp-sharesafe requirement") _(
b"share source does not support exp-sharesafe requirement"
) )
)
else:
requirements |= _readrequires(storevfs, False) requirements |= _readrequires(storevfs, False)
elif shared: elif shared:
sourcerequires = _readrequires(sharedvfs, False) sourcerequires = _readrequires(sharedvfs, False)
if requirementsmod.SHARESAFE_REQUIREMENT in sourcerequires: if requirementsmod.SHARESAFE_REQUIREMENT in sourcerequires:
if ui.configbool(b'experimental', b'sharesafe-auto-upgrade-shares'): if ui.configbool(b'experimental', b'sharesafe-auto-upgrade-shares'):
storerequires = _readrequires(storevfs, False) storerequires = _readrequires(storevfs, False)
wlock = None wlock = None
try: try:
wlock = lockmod.trylock(ui, hgvfs, b'wlock', 0, 0) wlock = lockmod.trylock(ui, hgvfs, b'wlock', 0, 0)

mercurial/scmutil.py

diffrequires = current_requirements - store_requirements diffrequires = current_requirements - store_requirements
# add share-safe requirement as it will mark the share as share-safe # add share-safe requirement as it will mark the share as share-safe
diffrequires.add(requirementsmod.SHARESAFE_REQUIREMENT) diffrequires.add(requirementsmod.SHARESAFE_REQUIREMENT)
writerequires(hgvfs, diffrequires) writerequires(hgvfs, diffrequires)
current_requirements.add(requirementsmod.SHARESAFE_REQUIREMENT) current_requirements.add(requirementsmod.SHARESAFE_REQUIREMENT)
return current_requirements return current_requirements
def downgrade_share_to_non_safe(
hgvfs, current_requirements, source_requirements
):
"""Downgrades a share which use share-safe to not use it
Returns the set of new repository requirements
"""
# we cannot be 100% sure on which requirements were present in store when
# the source supported share-safe. However, we do know that working
# directory requirements were not there. Hence we remove them
source_requirements -= requirementsmod.WORKING_DIR_REQUIREMENTS
current_requirements |= source_requirements
current_requirements.remove(requirementsmod.SHARESAFE_REQUIREMENT)
writerequires(hgvfs, current_requirements)
return current_requirements
class filecachesubentry(object): class filecachesubentry(object):
def __init__(self, path, stat): def __init__(self, path, stat):
self.path = path self.path = path
self.cachestat = None self.cachestat = None
self._cacheable = None self._cacheable = None
if stat: if stat:
self.cachestat = filecachesubentry.stat(self.path) self.cachestat = filecachesubentry.stat(self.path)

tests/test-share-safe.t

| |
o f3ba8b99bb6f897c87bbc1c07b75c6ddf43a4f77: added foo o f3ba8b99bb6f897c87bbc1c07b75c6ddf43a4f77: added foo
$ hg log -GT "{node}: {desc}\n" -R ../ss-share $ hg log -GT "{node}: {desc}\n" -R ../ss-share
abort: share source does not support exp-sharesafe requirement abort: share source does not support exp-sharesafe requirement
[255] [255]
Testing automatic downgrade of shares when config is set
$ hg log -GT "{node}: {desc}\n" -R ../ss-share --config experimental.sharesafe-auto-downgrade-shares=true
repository downgraded to not use share-safe mode
@ f63db81e6dde1d9c78814167f77fb1fb49283f4f: added bar
|
o f3ba8b99bb6f897c87bbc1c07b75c6ddf43a4f77: added foo
$ hg log -GT "{node}: {desc}\n" -R ../ss-share
@ f63db81e6dde1d9c78814167f77fb1fb49283f4f: added bar
|
o f3ba8b99bb6f897c87bbc1c07b75c6ddf43a4f77: added foo
Testing automatic upgrade of shares when config is set Testing automatic upgrade of shares when config is set
$ hg debugupgraderepo -q --run --config format.exp-share-safe=True $ hg debugupgraderepo -q --run --config format.exp-share-safe=True
upgrade will perform the following actions: upgrade will perform the following actions:
requirements requirements
preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store