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Differential D11871

upgrade: only process revlogs that needs it by default
ClosedPublic

Authored by marmoute on Dec 7 2021, 3:53 AM.

Details

Reviewers
Alphare
Group Reviewers
hg-reviewers
Commits
rHG62e6222cc5b6: upgrade: only process revlogs that needs it by default
Summary

We have more and more requirement that does not affect revlog or that only
affect some of them. It is silly to force a full processing of all revlog to
juste move the requirement around, or to simply rewrite the dirstate.

So now, only the revlog that needs to be touched will be touched. Unless the
--changelog & al flags are used.

Diff Detail

Repository
rHG Mercurial
Lint
Automatic diff as part of commit; lint not applicable.
Unit
Automatic diff as part of commit; unit tests not applicable.

Event Timeline

marmoute created this revision.Dec 7 2021, 3:53 AM
marmoute updated this revision to Diff 31341.Dec 7 2021, 4:13 AM
Alphare requested changes to this revision.Dec 10 2021, 4:55 AM
Alphare added a subscriber: Alphare.
Alphare added inline comments.
mercurial/upgrade.py
105

This probably needs to be deleted?

This revision now requires changes to proceed.Dec 10 2021, 4:55 AM
marmoute added inline comments.Dec 10 2021, 5:17 AM
mercurial/upgrade.py
105

indeed, thanks for spotting it.

marmoute updated this revision to Diff 31410.Dec 10 2021, 6:24 AM
marmoute added a commit: rHG62e6222cc5b6: upgrade: only process revlogs that needs it by default.Dec 10 2021, 10:47 AM
This revision was not accepted when it landed; it landed in state Needs Review.
Closed by commit rHG62e6222cc5b6: upgrade: only process revlogs that needs it by default (authored by marmoute). · Explain Why
This revision was automatically updated to reflect the committed changes.

Revision Contents
Changeset List

PathPackages
Mmercurial/upgrade.py (31 lines)
Mtests/test-share-safe.t (25 lines)
Mtests/test-upgrade-repo.t (33 lines)

Diff 31421

mercurial/upgrade.py

overwrite_msg = _(b'warning: ignoring %14s, as upgrade is changing: %s\n') overwrite_msg = _(b'warning: ignoring %14s, as upgrade is changing: %s\n')
select_msg = _(b'note: selecting %s for processing to change: %s\n') select_msg = _(b'note: selecting %s for processing to change: %s\n')
msg_issued = 0 msg_issued = 0
FL = upgrade_engine.UPGRADE_FILELOGS FL = upgrade_engine.UPGRADE_FILELOGS
MN = upgrade_engine.UPGRADE_MANIFEST MN = upgrade_engine.UPGRADE_MANIFEST
CL = upgrade_engine.UPGRADE_CHANGELOG CL = upgrade_engine.UPGRADE_CHANGELOG
if optimizations:
if any(specified_revlogs.values()):
# we have some limitation on revlogs to be recloned
for rl, enabled in specified_revlogs.items():
AlphareUnsubmitted
Not Done

This probably needs to be deleted?

Alphare: This probably needs to be deleted?
marmouteAuthorUnsubmitted
Done

indeed, thanks for spotting it.

marmoute: indeed, thanks for spotting it.
if enabled:
touched_revlogs.add(rl)
else:
touched_revlogs = set(upgrade_engine.UPGRADE_ALL_REVLOGS)
for rl, enabled in specified_revlogs.items():
if not enabled:
touched_revlogs.discard(rl)
for action in sorted(up_actions + removed_actions, key=lambda a: a.name): for action in sorted(up_actions + removed_actions, key=lambda a: a.name):
# optimisation does not "requires anything, they just needs it. # optimisation does not "requires anything, they just needs it.
if action.type != upgrade_actions.FORMAT_VARIANT: if action.type != upgrade_actions.FORMAT_VARIANT:
continue continue
if action.touches_filelogs and FL not in touched_revlogs: if action.touches_filelogs and FL not in touched_revlogs:
if FL in specified_revlogs: if FL in specified_revlogs:
if not specified_revlogs[FL]: if not specified_revlogs[FL]:
if not ui.quiet: if not ui.quiet:
msg_issued = 1 msg_issued = 1
touched_revlogs.add(CL) touched_revlogs.add(CL)
if msg_issued >= 2: if msg_issued >= 2:
ui.warn((b"\n")) ui.warn((b"\n"))
elif msg_issued >= 1: elif msg_issued >= 1:
ui.status((b"\n")) ui.status((b"\n"))
revlogs = set(upgrade_engine.UPGRADE_ALL_REVLOGS)
if specified_revlogs:
# we have some limitation on revlogs to be recloned
if any(specified_revlogs.values()):
revlogs = set()
for upgrade, enabled in specified_revlogs.items():
if enabled:
revlogs.add(upgrade)
else:
# none are enabled
for upgrade in specified_revlogs.keys():
revlogs.discard(upgrade)
# check the consistency of the revlog selection with the planned action # check the consistency of the revlog selection with the planned action
if revlogs != upgrade_engine.UPGRADE_ALL_REVLOGS: if touched_revlogs != upgrade_engine.UPGRADE_ALL_REVLOGS:
incompatible = upgrade_actions.RECLONES_REQUIREMENTS & ( incompatible = upgrade_actions.RECLONES_REQUIREMENTS & (
removedreqs | addedreqs removedreqs | addedreqs
) )
if incompatible: if incompatible:
msg = _( msg = _(
b'ignoring revlogs selection flags, format requirements ' b'ignoring revlogs selection flags, format requirements '
b'change: %s\n' b'change: %s\n'
) )
ui.warn(msg % b', '.join(sorted(incompatible))) ui.warn(msg % b', '.join(sorted(incompatible)))
revlogs = upgrade_engine.UPGRADE_ALL_REVLOGS touched_revlogs = upgrade_engine.UPGRADE_ALL_REVLOGS
upgrade_op = upgrade_actions.UpgradeOperation( upgrade_op = upgrade_actions.UpgradeOperation(
ui, ui,
newreqs, newreqs,
repo.requirements, repo.requirements,
up_actions, up_actions,
removed_actions, removed_actions,
revlogs, touched_revlogs,
backup, backup,
) )
if not run: if not run:
fromconfig = [] fromconfig = []
onlydefault = [] onlydefault = []
for d in format_upgrades: for d in format_upgrades:

tests/test-share-safe.t

Upgrade Upgrade
$ hg debugupgraderepo -q $ hg debugupgraderepo -q
requirements requirements
preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-dirstate-v2 !) preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-dirstate-v2 !)
preserved: dotencode, exp-rc-dirstate-v2, fncache, generaldelta, revlogv1, sparserevlog, store (dirstate-v2 !) preserved: dotencode, exp-rc-dirstate-v2, fncache, generaldelta, revlogv1, sparserevlog, store (dirstate-v2 !)
added: share-safe added: share-safe
processed revlogs: no revlogs to process
- all-filelogs
- changelog
- manifest
$ hg debugupgraderepo --run $ hg debugupgraderepo --run
upgrade will perform the following actions: upgrade will perform the following actions:
requirements requirements
preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-dirstate-v2 !) preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-dirstate-v2 !)
preserved: dotencode, exp-rc-dirstate-v2, fncache, generaldelta, revlogv1, sparserevlog, store (dirstate-v2 !) preserved: dotencode, exp-rc-dirstate-v2, fncache, generaldelta, revlogv1, sparserevlog, store (dirstate-v2 !)
added: share-safe added: share-safe
share-safe share-safe
Upgrades a repository to share-safe format so that future shares of this repository share its requirements and configs. Upgrades a repository to share-safe format so that future shares of this repository share its requirements and configs.
processed revlogs: no revlogs to process
- all-filelogs
- changelog
- manifest
beginning upgrade... beginning upgrade...
repository locked and read-only repository locked and read-only
creating temporary repository to stage upgraded data: $TESTTMP/non-share-safe/.hg/upgrade.* (glob) creating temporary repository to stage upgraded data: $TESTTMP/non-share-safe/.hg/upgrade.* (glob)
(it is safe to interrupt this process any time before data migration completes) (it is safe to interrupt this process any time before data migration completes)
upgrading repository requirements upgrading repository requirements
removing temporary repository $TESTTMP/non-share-safe/.hg/upgrade.* (glob) removing temporary repository $TESTTMP/non-share-safe/.hg/upgrade.* (glob)
repository upgraded to share safe mode, existing shares will still work in old non-safe mode. Re-share existing shares to use them in safe mode New shares will be created in safe mode. repository upgraded to share safe mode, existing shares will still work in old non-safe mode. Re-share existing shares to use them in safe mode New shares will be created in safe mode.
> EOF > EOF
$ hg debugupgraderepo -q $ hg debugupgraderepo -q
requirements requirements
preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-dirstate-v2 !) preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-dirstate-v2 !)
preserved: dotencode, exp-rc-dirstate-v2, fncache, generaldelta, revlogv1, sparserevlog, store (dirstate-v2 !) preserved: dotencode, exp-rc-dirstate-v2, fncache, generaldelta, revlogv1, sparserevlog, store (dirstate-v2 !)
removed: share-safe removed: share-safe
processed revlogs: no revlogs to process
- all-filelogs
- changelog
- manifest
$ hg debugupgraderepo --run $ hg debugupgraderepo --run
upgrade will perform the following actions: upgrade will perform the following actions:
requirements requirements
preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-dirstate-v2 !) preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-dirstate-v2 !)
preserved: dotencode, exp-rc-dirstate-v2, fncache, generaldelta, revlogv1, sparserevlog, store (dirstate-v2 !) preserved: dotencode, exp-rc-dirstate-v2, fncache, generaldelta, revlogv1, sparserevlog, store (dirstate-v2 !)
removed: share-safe removed: share-safe
processed revlogs: no revlogs to process
- all-filelogs
- changelog
- manifest
beginning upgrade... beginning upgrade...
repository locked and read-only repository locked and read-only
creating temporary repository to stage upgraded data: $TESTTMP/non-share-safe/.hg/upgrade.* (glob) creating temporary repository to stage upgraded data: $TESTTMP/non-share-safe/.hg/upgrade.* (glob)
(it is safe to interrupt this process any time before data migration completes) (it is safe to interrupt this process any time before data migration completes)
upgrading repository requirements upgrading repository requirements
removing temporary repository $TESTTMP/non-share-safe/.hg/upgrade.* (glob) removing temporary repository $TESTTMP/non-share-safe/.hg/upgrade.* (glob)
repository downgraded to not use share safe mode, existing shares will not work and needs to be reshared. repository downgraded to not use share safe mode, existing shares will not work and needs to be reshared.
$ hg debugupgraderepo -q --run --config format.use-share-safe=True $ hg debugupgraderepo -q --run --config format.use-share-safe=True
upgrade will perform the following actions: upgrade will perform the following actions:
requirements requirements
preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-dirstate-v2 !) preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-dirstate-v2 !)
preserved: dotencode, exp-rc-dirstate-v2, fncache, generaldelta, revlogv1, sparserevlog, store (dirstate-v2 !) preserved: dotencode, exp-rc-dirstate-v2, fncache, generaldelta, revlogv1, sparserevlog, store (dirstate-v2 !)
added: share-safe added: share-safe
processed revlogs: no revlogs to process
- all-filelogs
- changelog
- manifest
repository upgraded to share safe mode, existing shares will still work in old non-safe mode. Re-share existing shares to use them in safe mode New shares will be created in safe mode. repository upgraded to share safe mode, existing shares will still work in old non-safe mode. Re-share existing shares to use them in safe mode New shares will be created in safe mode.
$ hg debugrequirements $ hg debugrequirements
dotencode dotencode
dirstate-v2 (dirstate-v2 !) dirstate-v2 (dirstate-v2 !)
fncache fncache
generaldelta generaldelta
revlogv1 revlogv1

tests/test-upgrade-repo.t

$ hg debugupgraderepo $ hg debugupgraderepo
(no format upgrades found in existing repository) (no format upgrades found in existing repository)
performing an upgrade with "--run" will make the following changes: performing an upgrade with "--run" will make the following changes:
requirements requirements
preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !) preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !)
preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !) preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !)
processed revlogs: no revlogs to process
- all-filelogs
- changelog
- manifest
additional optimizations are available by specifying "--optimize <name>": additional optimizations are available by specifying "--optimize <name>":
re-delta-parent re-delta-parent
deltas within internal storage will be recalculated to choose an optimal base revision where this was not already done; the size of the repository may shrink and various operations may become faster; the first time this optimization is performed could slow down upgrade execution considerably; subsequent invocations should not run noticeably slower deltas within internal storage will be recalculated to choose an optimal base revision where this was not already done; the size of the repository may shrink and various operations may become faster; the first time this optimization is performed could slow down upgrade execution considerably; subsequent invocations should not run noticeably slower
re-delta-multibase re-delta-multibase
deltas within internal storage will be recalculated against multiple base revision and the smallest difference will be used; the size of the repository may shrink significantly when there are many merges; this optimization will slow down execution in proportion to the number of merges in the repository and the amount of files in the repository; this slow down should not be significant unless there are tens of thousands of files and thousands of merges deltas within internal storage will be recalculated against multiple base revision and the smallest difference will be used; the size of the repository may shrink significantly when there are many merges; this optimization will slow down execution in proportion to the number of merges in the repository and the amount of files in the repository; this slow down should not be significant unless there are tens of thousands of files and thousands of merges
re-delta-all re-delta-all
deltas within internal storage will always be recalculated without reusing prior deltas; this will likely make execution run several times slower; this optimization is typically not needed deltas within internal storage will always be recalculated without reusing prior deltas; this will likely make execution run several times slower; this optimization is typically not needed
re-delta-fulladd re-delta-fulladd
every revision will be re-added as if it was new content. It will go through the full storage mechanism giving extensions a chance to process it (eg. lfs). This is similar to "re-delta-all" but even slower since more logic is involved. every revision will be re-added as if it was new content. It will go through the full storage mechanism giving extensions a chance to process it (eg. lfs). This is similar to "re-delta-all" but even slower since more logic is involved.
$ hg debugupgraderepo --quiet $ hg debugupgraderepo --quiet
requirements requirements
preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !) preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !)
preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !) preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !)
processed revlogs: no revlogs to process
- all-filelogs
- changelog
- manifest
--optimize can be used to add optimizations --optimize can be used to add optimizations
$ hg debugupgrade --optimize 're-delta-parent' $ hg debugupgrade --optimize 're-delta-parent'
(no format upgrades found in existing repository) (no format upgrades found in existing repository)
performing an upgrade with "--run" will make the following changes: performing an upgrade with "--run" will make the following changes:
Check you can't skip revlog clone during important format downgrade Check you can't skip revlog clone during important format downgrade
$ echo "[format]" > .hg/hgrc $ echo "[format]" > .hg/hgrc
$ echo "sparse-revlog=no" >> .hg/hgrc $ echo "sparse-revlog=no" >> .hg/hgrc
$ hg debugupgrade --optimize re-delta-parent --no-manifest --no-backup --quiet $ hg debugupgrade --optimize re-delta-parent --no-manifest --no-backup --quiet
warning: ignoring --no-manifest, as upgrade is changing: sparserevlog warning: ignoring --no-manifest, as upgrade is changing: sparserevlog
ignoring revlogs selection flags, format requirements change: sparserevlog
requirements requirements
preserved: dotencode, fncache, generaldelta, revlogv1, store (no-rust !) preserved: dotencode, fncache, generaldelta, revlogv1, store (no-rust !)
preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, store (rust !) preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, store (rust !)
removed: sparserevlog removed: sparserevlog
optimisations: re-delta-parent optimisations: re-delta-parent
processed revlogs: processed revlogs:
- all-filelogs - all-filelogs
- changelog - changelog
- manifest - manifest
$ hg debugupgrade --optimize re-delta-parent --run --manifest --no-backup --debug --traceback $ hg debugupgrade --optimize re-delta-parent --run --manifest --no-backup --debug --traceback
note: selecting all-filelogs for processing to change: sparserevlog note: selecting all-filelogs for processing to change: sparserevlog
note: selecting changelog for processing to change: sparserevlog note: selecting changelog for processing to change: sparserevlog
ignoring revlogs selection flags, format requirements change: sparserevlog
upgrade will perform the following actions: upgrade will perform the following actions:
requirements requirements
preserved: dotencode, fncache, generaldelta, revlogv1, store (no-rust !) preserved: dotencode, fncache, generaldelta, revlogv1, store (no-rust !)
preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, store (rust !) preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, store (rust !)
removed: sparserevlog removed: sparserevlog
optimisations: re-delta-parent optimisations: re-delta-parent
Check you can't skip revlog clone during important format upgrade Check you can't skip revlog clone during important format upgrade
$ echo "sparse-revlog=yes" >> .hg/hgrc $ echo "sparse-revlog=yes" >> .hg/hgrc
$ hg debugupgrade --optimize re-delta-parent --run --manifest --no-backup --debug --traceback $ hg debugupgrade --optimize re-delta-parent --run --manifest --no-backup --debug --traceback
note: selecting all-filelogs for processing to change: sparserevlog note: selecting all-filelogs for processing to change: sparserevlog
note: selecting changelog for processing to change: sparserevlog note: selecting changelog for processing to change: sparserevlog
ignoring revlogs selection flags, format requirements change: sparserevlog
upgrade will perform the following actions: upgrade will perform the following actions:
requirements requirements
preserved: dotencode, fncache, generaldelta, revlogv1, store (no-rust !) preserved: dotencode, fncache, generaldelta, revlogv1, store (no-rust !)
preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, store (rust !) preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, store (rust !)
added: sparserevlog added: sparserevlog
optimisations: re-delta-parent optimisations: re-delta-parent
requirements requirements
preserved: * (glob) preserved: * (glob)
added: dirstate-v2 added: dirstate-v2
dirstate-v2 dirstate-v2
"hg status" will be faster "hg status" will be faster
processed revlogs: no revlogs to process
- all-filelogs
- changelog
- manifest
beginning upgrade... beginning upgrade...
repository locked and read-only repository locked and read-only
creating temporary repository to stage upgraded data: $TESTTMP/sparserevlogrepo/.hg/upgrade.* (glob) creating temporary repository to stage upgraded data: $TESTTMP/sparserevlogrepo/.hg/upgrade.* (glob)
(it is safe to interrupt this process any time before data migration completes) (it is safe to interrupt this process any time before data migration completes)
upgrading to dirstate-v2 from v1 upgrading to dirstate-v2 from v1
replaced files will be backed up at $TESTTMP/sparserevlogrepo/.hg/upgradebackup.* (glob) replaced files will be backed up at $TESTTMP/sparserevlogrepo/.hg/upgradebackup.* (glob)
removing temporary repository $TESTTMP/sparserevlogrepo/.hg/upgrade.* (glob) removing temporary repository $TESTTMP/sparserevlogrepo/.hg/upgrade.* (glob)
$ hg debugupgraderepo --run $ hg debugupgraderepo --run
upgrade will perform the following actions: upgrade will perform the following actions:
requirements requirements
preserved: * (glob) preserved: * (glob)
removed: dirstate-v2 removed: dirstate-v2
processed revlogs: no revlogs to process
- all-filelogs
- changelog
- manifest
beginning upgrade... beginning upgrade...
repository locked and read-only repository locked and read-only
creating temporary repository to stage upgraded data: $TESTTMP/sparserevlogrepo/.hg/upgrade.* (glob) creating temporary repository to stage upgraded data: $TESTTMP/sparserevlogrepo/.hg/upgrade.* (glob)
(it is safe to interrupt this process any time before data migration completes) (it is safe to interrupt this process any time before data migration completes)
downgrading from dirstate-v2 to v1 downgrading from dirstate-v2 to v1
replaced files will be backed up at $TESTTMP/sparserevlogrepo/.hg/upgradebackup.* (glob) replaced files will be backed up at $TESTTMP/sparserevlogrepo/.hg/upgradebackup.* (glob)
removing temporary repository $TESTTMP/sparserevlogrepo/.hg/upgrade.* (glob) removing temporary repository $TESTTMP/sparserevlogrepo/.hg/upgrade.* (glob)
requirements requirements
preserved: * (glob) preserved: * (glob)
added: dirstate-v2 added: dirstate-v2
dirstate-v2 dirstate-v2
"hg status" will be faster "hg status" will be faster
processed revlogs: no revlogs to process
- all-filelogs
- changelog
- manifest
beginning upgrade... beginning upgrade...
repository locked and read-only repository locked and read-only
creating temporary repository to stage upgraded data: $TESTTMP/dirstate-v2-empty/.hg/upgrade.* (glob) creating temporary repository to stage upgraded data: $TESTTMP/dirstate-v2-empty/.hg/upgrade.* (glob)
(it is safe to interrupt this process any time before data migration completes) (it is safe to interrupt this process any time before data migration completes)
upgrading to dirstate-v2 from v1 upgrading to dirstate-v2 from v1
replaced files will be backed up at $TESTTMP/dirstate-v2-empty/.hg/upgradebackup.* (glob) replaced files will be backed up at $TESTTMP/dirstate-v2-empty/.hg/upgradebackup.* (glob)
removing temporary repository $TESTTMP/dirstate-v2-empty/.hg/upgrade.* (glob) removing temporary repository $TESTTMP/dirstate-v2-empty/.hg/upgrade.* (glob)
$ hg debugformat | grep dirstate-v2 $ hg debugformat | grep dirstate-v2
dirstate-v2: yes dirstate-v2: yes
downgrade downgrade
$ hg debugupgraderepo --run --config format.exp-rc-dirstate-v2=no $ hg debugupgraderepo --run --config format.exp-rc-dirstate-v2=no
upgrade will perform the following actions: upgrade will perform the following actions:
requirements requirements
preserved: * (glob) preserved: * (glob)
removed: dirstate-v2 removed: dirstate-v2
processed revlogs: no revlogs to process
- all-filelogs
- changelog
- manifest
beginning upgrade... beginning upgrade...
repository locked and read-only repository locked and read-only
creating temporary repository to stage upgraded data: $TESTTMP/dirstate-v2-empty/.hg/upgrade.* (glob) creating temporary repository to stage upgraded data: $TESTTMP/dirstate-v2-empty/.hg/upgrade.* (glob)
(it is safe to interrupt this process any time before data migration completes) (it is safe to interrupt this process any time before data migration completes)
downgrading from dirstate-v2 to v1 downgrading from dirstate-v2 to v1
replaced files will be backed up at $TESTTMP/dirstate-v2-empty/.hg/upgradebackup.* (glob) replaced files will be backed up at $TESTTMP/dirstate-v2-empty/.hg/upgradebackup.* (glob)
removing temporary repository $TESTTMP/dirstate-v2-empty/.hg/upgrade.* (glob) removing temporary repository $TESTTMP/dirstate-v2-empty/.hg/upgrade.* (glob)
$ hg debugformat | grep dirstate-v2 $ hg debugformat | grep dirstate-v2
dirstate-v2: no dirstate-v2: no
$ cd .. $ cd ..