view tests/test-shelve2.t @ 42193:14589f1989e9 stable

context: check file exists before getting data from _wrappedctx

overlayworkingctx class is used to do in-memory merging. The data() function of
that class has logic to look for data() in the wrappedctx if the file data in
cache is empty and if the file is dirty. This assumes that if a file is dirty
and cache has empty data for it, it will exists in the _wrappedctx.

However this assumption can be False in case when we are merging a file which is
empty in destination. In these cases, the backup file 'foo.orig' created by our
internal merge algorithms will be empty, however it won't be present in
_wrappedctx. This case will lead us to error like the one this patch is fixing.

Let's only fallback to getting data from wrappedctx if cache has 'None' as data.

Differential Revision: https://phab.mercurial-scm.org/D6308

#testcases stripbased phasebased

  $ cat <<EOF >> $HGRCPATH
  > [extensions]
  > mq =
  > shelve =
  > [defaults]
  > diff = --nodates --git
  > qnew = --date '0 0'
  > [shelve]
  > maxbackups = 2
  > EOF

#if phasebased

  $ cat <<EOF >> $HGRCPATH
  > [format]
  > internal-phase = yes
  > EOF

#endif

shelve should leave dirstate clean (issue4055)

  $ hg init shelverebase
  $ cd shelverebase
  $ printf 'x\ny\n' > x
  $ echo z > z
  $ hg commit -Aqm xy
  $ echo z >> x
  $ hg commit -Aqm z
  $ hg up 5c4c67fb7dce
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ printf 'a\nx\ny\nz\n' > x
  $ hg commit -Aqm xyz
  $ echo c >> z
  $ hg shelve
  shelved as default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ hg rebase -d 6c103be8f4e4 --config extensions.rebase=
  rebasing 2:323bfa07f744 "xyz"( \(tip\))? (re)
  merging x
  saved backup bundle to \$TESTTMP/shelverebase/.hg/strip-backup/323bfa07f744-(78114325|7ae538ef)-rebase.hg (re)
  $ hg unshelve
  unshelving change 'default'
  rebasing shelved changes
  $ hg status
  M z

  $ cd ..

shelve should only unshelve pending changes (issue4068)

  $ hg init onlypendingchanges
  $ cd onlypendingchanges
  $ touch a
  $ hg ci -Aqm a
  $ touch b
  $ hg ci -Aqm b
  $ hg up -q 3903775176ed
  $ touch c
  $ hg ci -Aqm c

  $ touch d
  $ hg add d
  $ hg shelve
  shelved as default
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg up -q 0e067c57feba
  $ hg unshelve
  unshelving change 'default'
  rebasing shelved changes
  $ hg status
  A d

unshelve should work on an ancestor of the original commit

  $ hg shelve
  shelved as default
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg up 3903775176ed
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg unshelve
  unshelving change 'default'
  rebasing shelved changes
  $ hg status
  A d

test bug 4073 we need to enable obsolete markers for it

  $ cat >> $HGRCPATH << EOF
  > [experimental]
  > evolution.createmarkers=True
  > EOF
  $ hg shelve
  shelved as default
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg debugobsolete `hg log -r 0e067c57feba -T '{node}'`
  obsoleted 1 changesets
  $ hg unshelve
  unshelving change 'default'

unshelve should leave unknown files alone (issue4113)

  $ echo e > e
  $ hg shelve
  shelved as default
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg status
  ? e
  $ hg unshelve
  unshelving change 'default'
  $ hg status
  A d
  ? e
  $ cat e
  e

unshelve should keep a copy of unknown files

  $ hg add e
  $ hg shelve
  shelved as default
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ echo z > e
  $ hg unshelve
  unshelving change 'default'
  $ cat e
  e
  $ cat e.orig
  z
  $ rm e.orig

restores backup of unknown file to right directory

  $ hg shelve
  shelved as default
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ echo z > e
  $ mkdir dir
  $ hg unshelve --cwd dir
  unshelving change 'default'
  $ rmdir dir
  $ cat e
  e
  $ cat e.orig
  z

unshelve and conflicts with tracked and untracked files

 preparing:

  $ rm -f *.orig
  $ hg ci -qm 'commit stuff'
  $ hg phase -p null:

 no other changes - no merge:

  $ echo f > f
  $ hg add f
  $ hg shelve
  shelved as default
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo g > f
  $ hg unshelve
  unshelving change 'default'
  $ hg st
  A f
  ? f.orig
  $ cat f
  f
  $ cat f.orig
  g

 other uncommitted changes - merge:

  $ hg st
  A f
  ? f.orig
  $ hg shelve
  shelved as default
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
#if repobundlerepo
  $ hg log -G --template '{rev}  {desc|firstline}  {author}' -R bundle://.hg/shelved/default.hg -r 'bundle()' --hidden
  o  [48]  changes to: commit stuff  shelve@localhost (re)
  |
  ~
#endif
  $ hg log -G --template '{rev}  {desc|firstline}  {author}'
  @  [37]  commit stuff  test (re)
  |
  | o  2  c  test
  |/
  o  0  a  test
  
  $ mv f.orig f
  $ echo 1 > a
  $ hg unshelve --date '1073741824 0'
  unshelving change 'default'
  temporarily committing pending changes (restore with 'hg unshelve --abort')
  rebasing shelved changes
  merging f
  warning: conflicts while merging f! (edit, then use 'hg resolve --mark')
  unresolved conflicts (see 'hg resolve', then 'hg unshelve --continue')
  [1]

#if phasebased
  $ hg log -G --template '{rev}  {desc|firstline}  {author}  {date|isodate}'
  @  9  pending changes temporary commit  shelve@localhost  2004-01-10 13:37 +0000
  |
  | @  8  changes to: commit stuff  shelve@localhost  1970-01-01 00:00 +0000
  |/
  o  7  commit stuff  test  1970-01-01 00:00 +0000
  |
  | o  2  c  test  1970-01-01 00:00 +0000
  |/
  o  0  a  test  1970-01-01 00:00 +0000
  
#endif

#if stripbased
  $ hg log -G --template '{rev}  {desc|firstline}  {author}  {date|isodate}'
  @  5  changes to: commit stuff  shelve@localhost  1970-01-01 00:00 +0000
  |
  | @  4  pending changes temporary commit  shelve@localhost  2004-01-10 13:37 +0000
  |/
  o  3  commit stuff  test  1970-01-01 00:00 +0000
  |
  | o  2  c  test  1970-01-01 00:00 +0000
  |/
  o  0  a  test  1970-01-01 00:00 +0000
  
#endif

  $ hg st
  M f
  ? f.orig
  $ cat f
  <<<<<<< shelve:       d44eae5c3d33 - shelve: pending changes temporary commit
  g
  =======
  f
  >>>>>>> working-copy: aef214a5229c - shelve: changes to: commit stuff
  $ cat f.orig
  g
  $ hg unshelve --abort -t false
  tool option will be ignored
  unshelve of 'default' aborted
  $ hg st
  M a
  ? f.orig
  $ cat f.orig
  g
  $ hg unshelve
  unshelving change 'default'
  temporarily committing pending changes (restore with 'hg unshelve --abort')
  rebasing shelved changes
  $ hg st
  M a
  A f
  ? f.orig

 other committed changes - merge:

  $ hg shelve f
  shelved as default
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg ci a -m 'intermediate other change'
  $ mv f.orig f
  $ hg unshelve
  unshelving change 'default'
  rebasing shelved changes
  merging f
  warning: conflicts while merging f! (edit, then use 'hg resolve --mark')
  unresolved conflicts (see 'hg resolve', then 'hg unshelve --continue')
  [1]
  $ hg st
  M f
  ? f.orig
  $ cat f
  <<<<<<< shelve:       6b563750f973 - test: intermediate other change
  g
  =======
  f
  >>>>>>> working-copy: aef214a5229c - shelve: changes to: commit stuff
  $ cat f.orig
  g
  $ hg unshelve --abort
  unshelve of 'default' aborted
  $ hg st
  ? f.orig
  $ cat f.orig
  g
  $ hg shelve --delete default
  $ cd ..

you shouldn't be able to ask for the patch/stats of the most recent shelve if
there are no shelves

  $ hg init noshelves
  $ cd noshelves

  $ hg shelve --patch
  abort: there are no shelves to show
  [255]
  $ hg shelve --stat
  abort: there are no shelves to show
  [255]

  $ cd ..

test .orig files go where the user wants them to
---------------------------------------------------------------
  $ hg init salvage
  $ cd salvage
  $ echo 'content' > root
  $ hg commit -A -m 'root' -q
  $ echo '' > root
  $ hg shelve -q
  $ echo 'contADDent' > root
  $ hg unshelve -q --config 'ui.origbackuppath=.hg/origbackups'
  warning: conflicts while merging root! (edit, then use 'hg resolve --mark')
  unresolved conflicts (see 'hg resolve', then 'hg unshelve --continue')
  [1]
  $ ls .hg/origbackups
  root
  $ rm -rf .hg/origbackups

test Abort unshelve always gets user out of the unshelved state
---------------------------------------------------------------

with a corrupted shelve state file
  $ sed 's/ae8c668541e8/123456789012/' .hg/shelvedstate > ../corrupt-shelvedstate
  $ mv ../corrupt-shelvedstate .hg/shelvestate
  $ hg unshelve --abort 2>&1 | grep 'aborted'
  unshelve of 'default' aborted
  $ hg summary
  parent: 0:ae8c668541e8 tip
   root
  branch: default
  commit: 1 modified
  update: (current)
  phases: 1 draft
  $ hg up -C .
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ cd ..

Shelve and unshelve unknown files. For the purposes of unshelve, a shelved
unknown file is the same as a shelved added file, except that it will be in
unknown state after unshelve if and only if it was either absent or unknown
before the unshelve operation.

  $ hg init unknowns
  $ cd unknowns

The simplest case is if I simply have an unknown file that I shelve and unshelve

  $ echo unknown > unknown
  $ hg status
  ? unknown
  $ hg shelve --unknown
  shelved as default
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg status
  $ hg unshelve
  unshelving change 'default'
  $ hg status
  ? unknown
  $ rm unknown

If I shelve, add the file, and unshelve, does it stay added?

  $ echo unknown > unknown
  $ hg shelve -u
  shelved as default
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg status
  $ touch unknown
  $ hg add unknown
  $ hg status
  A unknown
  $ hg unshelve
  unshelving change 'default'
  temporarily committing pending changes (restore with 'hg unshelve --abort')
  rebasing shelved changes
  merging unknown
  $ hg status
  A unknown
  $ hg forget unknown
  $ rm unknown

And if I shelve, commit, then unshelve, does it become modified?

  $ echo unknown > unknown
  $ hg shelve -u
  shelved as default
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg status
  $ touch unknown
  $ hg add unknown
  $ hg commit -qm "Add unknown"
  $ hg status
  $ hg unshelve
  unshelving change 'default'
  rebasing shelved changes
  merging unknown
  $ hg status
  M unknown
  $ hg remove --force unknown
  $ hg commit -qm "Remove unknown"

  $ cd ..

We expects that non-bare shelve keeps newly created branch in
working directory.

  $ hg init shelve-preserve-new-branch
  $ cd shelve-preserve-new-branch
  $ echo "a" >> a
  $ hg add a
  $ echo "b" >> b
  $ hg add b
  $ hg commit -m "ab"
  $ echo "aa" >> a
  $ echo "bb" >> b
  $ hg branch new-branch
  marked working directory as branch new-branch
  (branches are permanent and global, did you want a bookmark?)
  $ hg status
  M a
  M b
  $ hg branch
  new-branch
  $ hg shelve a
  shelved as default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg branch
  new-branch
  $ hg status
  M b
  $ touch "c" >> c
  $ hg add c
  $ hg status
  M b
  A c
  $ hg shelve --exclude c
  shelved as default-01
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg branch
  new-branch
  $ hg status
  A c
  $ hg shelve --include c
  shelved as default-02
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg branch
  new-branch
  $ hg status
  $ echo "d" >> d
  $ hg add d
  $ hg status
  A d

We expect that bare-shelve will not keep branch in current working directory.

  $ hg shelve
  shelved as default-03
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg branch
  default
  $ cd ..

When i shelve commit on newly created branch i expect
that after unshelve newly created branch will be preserved.

  $ hg init shelve_on_new_branch_simple
  $ cd shelve_on_new_branch_simple
  $ echo "aaa" >> a
  $ hg commit -A -m "a"
  adding a
  $ hg branch
  default
  $ hg branch test
  marked working directory as branch test
  (branches are permanent and global, did you want a bookmark?)
  $ echo "bbb" >> a
  $ hg status
  M a
  $ hg shelve
  shelved as default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg branch
  default
  $ echo "bbb" >> b
  $ hg status
  ? b
  $ hg unshelve
  unshelving change 'default'
  marked working directory as branch test
  $ hg status
  M a
  ? b
  $ hg branch
  test
  $ cd ..

When i shelve commit on newly created branch, make
some changes, unshelve it and running into merge
conflicts i expect that after fixing them and
running unshelve --continue newly created branch
will be preserved.

  $ hg init shelve_on_new_branch_conflict
  $ cd shelve_on_new_branch_conflict
  $ echo "aaa" >> a
  $ hg commit -A -m "a"
  adding a
  $ hg branch
  default
  $ hg branch test
  marked working directory as branch test
  (branches are permanent and global, did you want a bookmark?)
  $ echo "bbb" >> a
  $ hg status
  M a
  $ hg shelve
  shelved as default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg branch
  default
  $ echo "ccc" >> a
  $ hg status
  M a
  $ hg unshelve
  unshelving change 'default'
  temporarily committing pending changes (restore with 'hg unshelve --abort')
  rebasing shelved changes
  merging a
  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
  unresolved conflicts (see 'hg resolve', then 'hg unshelve --continue')
  [1]
  $ echo "aaabbbccc" > a
  $ rm a.orig
  $ hg resolve --mark a
  (no more unresolved files)
  continue: hg unshelve --continue
  $ hg unshelve --continue
  marked working directory as branch test
  unshelve of 'default' complete
  $ cat a
  aaabbbccc
  $ hg status
  M a
  $ hg branch
  test
  $ hg commit -m "test-commit"

When i shelve on test branch, update to default branch
and unshelve i expect that it will not preserve previous
test branch.

  $ echo "xxx" > b
  $ hg add b
  $ hg shelve
  shelved as test
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg update -r 7049e48789d7
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg unshelve
  unshelving change 'test'
  rebasing shelved changes
  $ hg status
  A b
  $ hg branch
  default
  $ cd ..

When i unshelve resulting in merge conflicts and makes saved
file shelvedstate looks like in previous versions in
mercurial(without restore branch information in 7th line) i
expect that after resolving conflicts and successfully
running 'shelve --continue' the branch information won't be
restored and branch will be unchanged.

shelve on new branch, conflict with previous shelvedstate

  $ hg init conflict
  $ cd conflict
  $ echo "aaa" >> a
  $ hg commit -A -m "a"
  adding a
  $ hg branch
  default
  $ hg branch test
  marked working directory as branch test
  (branches are permanent and global, did you want a bookmark?)
  $ echo "bbb" >> a
  $ hg status
  M a
  $ hg shelve
  shelved as default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg branch
  default
  $ echo "ccc" >> a
  $ hg status
  M a
  $ hg unshelve
  unshelving change 'default'
  temporarily committing pending changes (restore with 'hg unshelve --abort')
  rebasing shelved changes
  merging a
  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
  unresolved conflicts (see 'hg resolve', then 'hg unshelve --continue')
  [1]

Removing restore branch information from shelvedstate file(making it looks like
in previous versions) and running unshelve --continue

  $ cp .hg/shelvedstate .hg/shelvedstate_old
  $ cat .hg/shelvedstate_old | grep -v 'branchtorestore' > .hg/shelvedstate

  $ echo "aaabbbccc" > a
  $ rm a.orig
  $ hg resolve --mark a
  (no more unresolved files)
  continue: hg unshelve --continue
  $ hg unshelve --continue
  unshelve of 'default' complete
  $ cat a
  aaabbbccc
  $ hg status
  M a
  $ hg branch
  default
  $ cd ..

On non bare shelve the branch information shouldn't be restored

  $ hg init bare_shelve_on_new_branch
  $ cd bare_shelve_on_new_branch
  $ echo "aaa" >> a
  $ hg commit -A -m "a"
  adding a
  $ hg branch
  default
  $ hg branch test
  marked working directory as branch test
  (branches are permanent and global, did you want a bookmark?)
  $ echo "bbb" >> a
  $ hg status
  M a
  $ hg shelve a
  shelved as default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg branch
  test
  $ hg branch default
  marked working directory as branch default
  (branches are permanent and global, did you want a bookmark?)
  $ echo "bbb" >> b
  $ hg status
  ? b
  $ hg unshelve
  unshelving change 'default'
  $ hg status
  M a
  ? b
  $ hg branch
  default
  $ cd ..

Prepare unshelve with a corrupted shelvedstate
  $ hg init r1 && cd r1
  $ echo text1 > file && hg add file
  $ hg shelve
  shelved as default
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo text2 > file && hg ci -Am text1
  adding file
  $ hg unshelve
  unshelving change 'default'
  rebasing shelved changes
  merging file
  warning: conflicts while merging file! (edit, then use 'hg resolve --mark')
  unresolved conflicts (see 'hg resolve', then 'hg unshelve --continue')
  [1]
  $ echo somethingsomething > .hg/shelvedstate

Unshelve --continue fails with appropriate message if shelvedstate is corrupted
  $ hg unshelve --continue
  abort: corrupted shelved state file
  (please run hg unshelve --abort to abort unshelve operation)
  [255]

Unshelve --abort works with a corrupted shelvedstate
  $ hg unshelve --abort
  could not read shelved state file, your working copy may be in an unexpected state
  please update to some commit

Unshelve --abort fails with appropriate message if there's no unshelve in
progress
  $ hg unshelve --abort
  abort: no unshelve in progress
  [255]
  $ cd ..

Unshelve respects --keep even if user intervention is needed
  $ hg init unshelvekeep && cd unshelvekeep
  $ echo 1 > file && hg ci -Am 1
  adding file
  $ echo 2 >> file
  $ hg shelve
  shelved as default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo 3 >> file && hg ci -Am 13
  $ hg shelve --list
  default         (*s ago) * changes to: 1 (glob)
  $ hg unshelve --keep
  unshelving change 'default'
  rebasing shelved changes
  merging file
  warning: conflicts while merging file! (edit, then use 'hg resolve --mark')
  unresolved conflicts (see 'hg resolve', then 'hg unshelve --continue')
  [1]
  $ hg resolve --mark file
  (no more unresolved files)
  continue: hg unshelve --continue
  $ hg unshelve --continue
  unshelve of 'default' complete
  $ hg shelve --list
  default         (*s ago) * changes to: 1 (glob)
  $ cd ..

Unshelving when there are deleted files does not crash (issue4176)
  $ hg init unshelve-deleted-file && cd unshelve-deleted-file
  $ echo a > a && echo b > b && hg ci -Am ab
  adding a
  adding b
  $ echo aa > a && hg shelve
  shelved as default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ rm b
  $ hg st
  ! b
  $ hg unshelve
  unshelving change 'default'
  $ hg shelve
  shelved as default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ rm a && echo b > b
  $ hg st
  ! a
  $ hg unshelve
  unshelving change 'default'
  abort: shelved change touches missing files
  (run hg status to see which files are missing)
  [255]
  $ hg st
  ! a
  $ cd ..

New versions of Mercurial know how to read onld shelvedstate files
  $ hg init oldshelvedstate
  $ cd oldshelvedstate
  $ echo root > root && hg ci -Am root
  adding root
  $ echo 1 > a
  $ hg add a
  $ hg shelve --name ashelve
  shelved as ashelve
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo 2 > a
  $ hg ci -Am a
  adding a
  $ hg unshelve
  unshelving change 'ashelve'
  rebasing shelved changes
  merging a
  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
  unresolved conflicts (see 'hg resolve', then 'hg unshelve --continue')
  [1]
putting v1 shelvedstate file in place of a created v2
  $ cat << EOF > .hg/shelvedstate
  > 1
  > ashelve
  > 8b058dae057a5a78f393f4535d9e363dd5efac9d
  > 8b058dae057a5a78f393f4535d9e363dd5efac9d
  > 8b058dae057a5a78f393f4535d9e363dd5efac9d f543b27db2cdb41737e2e0008dc524c471da1446
  > f543b27db2cdb41737e2e0008dc524c471da1446
  > 
  > nokeep
  > :no-active-bookmark
  > EOF
  $ echo 1 > a
  $ hg resolve --mark a
  (no more unresolved files)
  continue: hg unshelve --continue
mercurial does not crash
  $ hg unshelve --continue
  unshelve of 'ashelve' complete

#if phasebased

Unshelve with some metadata file missing
----------------------------------------

  $ hg shelve
  shelved as default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo 3 > a

Test with the `.shelve` missing, but the changeset still in the repo (non-natural case)

  $ rm .hg/shelved/default.shelve
  $ hg unshelve
  unshelving change 'default'
  temporarily committing pending changes (restore with 'hg unshelve --abort')
  rebasing shelved changes
  merging a
  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
  unresolved conflicts (see 'hg resolve', then 'hg unshelve --continue')
  [1]
  $ hg unshelve --abort
  unshelve of 'default' aborted

Unshelve without .shelve metadata (can happen when upgrading a repository with old shelve)

  $ cat .hg/shelved/default.shelve
  node=82e0cb9893247d12667017593ce1e5655860f1ac
  $ hg strip --hidden --rev 82e0cb989324 --no-backup
  $ rm .hg/shelved/default.shelve
  $ hg unshelve
  unshelving change 'default'
  temporarily committing pending changes (restore with 'hg unshelve --abort')
  rebasing shelved changes
  merging a
  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
  unresolved conflicts (see 'hg resolve', then 'hg unshelve --continue')
  [1]
  $ cat .hg/shelved/default.shelve
  node=82e0cb9893247d12667017593ce1e5655860f1ac
  $ hg unshelve --abort
  unshelve of 'default' aborted

#endif

  $ cd ..