view tests/test-bookmarks.t @ 26750:9f9ec4abe700

cmdutil: make in-memory changes visible to external editor (issue4378)

Before this patch, external editor process for the commit log can't
view some in-memory changes (especially, of dirstate), because they
aren't written out until the end of transaction (or wlock).

This causes unexpected output of Mercurial commands spawned from that
editor process.

To make in-memory changes visible to external editor process, this
patch does:

  - write (or schedule to write) in-memory dirstate changes, and
  - set HG_PENDING environment variable, if:
    - a transaction is running, and
    - there are in-memory changes to be visible

"hg diff" spawned from external editor process for "hg qrefresh"
shows:

  - "changes newly imported into the topmost" before 49148d7868df(*)
  - "all changes recorded in the topmost by refreshing" after this patch

(*) 49148d7868df changed steps invoking editor process

Even though backward compatibility may be broken, the latter behavior
looks reasonable, because "hg diff" spawned from the editor process
consistently shows "what changes new revision records" regardless of
invocation context.

In fact, issue4378 itself should be resolved by 800e090e9c64, which
made 'repo.transaction()' write in-memory dirstate changes out
explicitly before starting transaction. It also made "hg qrefresh"
imply 'dirstate.write()' before external editor invocation in call
chain below.

  - mq.queue.refresh
    - strip.strip
      - repair.strip
        - localrepository.transaction
          - dirstate.write
    - localrepository.commit
      - invoke external editor

Though, this patch has '(issue4378)' in own summary line to indicate
that issues like issue4378 should be fixed by this.

BTW, this patch adds '-m' option to a 'hg ci --amend' execution in
'test-commit-amend.t', to avoid invoking external editor process.

In this case, "unsure" states may be changed to "clean" according to
timestamp or so on. These changes should be written into pending file,
if external editor invocation is required,

Then, writing dirstate changes out breaks stability of test, because
it shows "transaction abort!/rollback completed" occasionally.

Aborting after editor process invocation while commands below may
cause similar instability of tests, too (AFAIK, there is no more such
one, at this revision)

  - commit --amend
    - without --message/--logfile

  - import
    - without --message/--logfile,
    - without --no-commit,
    - without --bypass,
    - one of below, and
      - patch has no description text, or
      - with --edit
    - aborting at the 1st patch, which adds or removes file(s)
      - if it only changes existing files, status is checked only for
        changed files by 'scmutil.matchfiles()', and transition from
        "unsure" to "normal" in dirstate doesn't occur (= dirstate
        isn't changed, and written out)
      - aborting at the 2nd or later patch implies other pending
        changes (e.g. changelog), and always causes showing
        "transaction abort!/rollback completed"

  $ hg init

no bookmarks

  $ hg bookmarks
  no bookmarks set

  $ hg bookmarks -Tjson
  [
  ]

bookmark rev -1

  $ hg bookmark X

list bookmarks

  $ hg bookmarks
   * X                         -1:000000000000

list bookmarks with color

  $ hg --config extensions.color= --config color.mode=ansi \
  >    bookmarks --color=always
  \x1b[0;32m * \x1b[0m\x1b[0;32mX\x1b[0m\x1b[0;32m                         -1:000000000000\x1b[0m (esc)

  $ echo a > a
  $ hg add a
  $ hg commit -m 0

bookmark X moved to rev 0

  $ hg bookmarks
   * X                         0:f7b1eb17ad24

look up bookmark

  $ hg log -r X
  changeset:   0:f7b1eb17ad24
  bookmark:    X
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     0
  

second bookmark for rev 0, command should work even with ui.strict on

  $ hg --config ui.strict=1 bookmark X2

bookmark rev -1 again

  $ hg bookmark -r null Y

list bookmarks

  $ hg bookmarks
     X                         0:f7b1eb17ad24
   * X2                        0:f7b1eb17ad24
     Y                         -1:000000000000

  $ echo b > b
  $ hg add b
  $ hg commit -m 1

  $ hg bookmarks -Tjson
  [
   {
    "active": false,
    "bookmark": "X",
    "node": "f7b1eb17ad24730a1651fccd46c43826d1bbc2ac",
    "rev": 0
   },
   {
    "active": true,
    "bookmark": "X2",
    "node": "925d80f479bb026b0fb3deb27503780b13f74123",
    "rev": 1
   },
   {
    "active": false,
    "bookmark": "Y",
    "node": "0000000000000000000000000000000000000000",
    "rev": -1
   }
  ]

bookmarks revset

  $ hg log -r 'bookmark()'
  changeset:   0:f7b1eb17ad24
  bookmark:    X
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     0
  
  changeset:   1:925d80f479bb
  bookmark:    X2
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     1
  
  $ hg log -r 'bookmark(Y)'
  $ hg log -r 'bookmark(X2)'
  changeset:   1:925d80f479bb
  bookmark:    X2
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     1
  
  $ hg log -r 'bookmark("re:X")'
  changeset:   0:f7b1eb17ad24
  bookmark:    X
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     0
  
  changeset:   1:925d80f479bb
  bookmark:    X2
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     1
  
  $ hg log -r 'bookmark("literal:X")'
  changeset:   0:f7b1eb17ad24
  bookmark:    X
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     0
  

  $ hg log -r 'bookmark(unknown)'
  abort: bookmark 'unknown' does not exist!
  [255]
  $ hg log -r 'bookmark("literal:unknown")'
  abort: bookmark 'unknown' does not exist!
  [255]
  $ hg log -r 'bookmark("re:unknown")'
  abort: no bookmarks exist that match 'unknown'!
  [255]
  $ hg log -r 'present(bookmark("literal:unknown"))'
  $ hg log -r 'present(bookmark("re:unknown"))'

  $ hg help revsets | grep 'bookmark('
      "bookmark([name])"

bookmarks X and X2 moved to rev 1, Y at rev -1

  $ hg bookmarks
     X                         0:f7b1eb17ad24
   * X2                        1:925d80f479bb
     Y                         -1:000000000000

bookmark rev 0 again

  $ hg bookmark -r 0 Z

  $ hg update X
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  (activating bookmark X)
  $ echo c > c
  $ hg add c
  $ hg commit -m 2
  created new head

bookmarks X moved to rev 2, Y at rev -1, Z at rev 0

  $ hg bookmarks
   * X                         2:db815d6d32e6
     X2                        1:925d80f479bb
     Y                         -1:000000000000
     Z                         0:f7b1eb17ad24

rename nonexistent bookmark

  $ hg bookmark -m A B
  abort: bookmark 'A' does not exist
  [255]

rename to existent bookmark

  $ hg bookmark -m X Y
  abort: bookmark 'Y' already exists (use -f to force)
  [255]

force rename to existent bookmark

  $ hg bookmark -f -m X Y

list bookmarks

  $ hg bookmark
     X2                        1:925d80f479bb
   * Y                         2:db815d6d32e6
     Z                         0:f7b1eb17ad24

bookmarks from a revset
  $ hg bookmark -r '.^1' REVSET
  $ hg bookmark -r ':tip' TIP
  $ hg up -q TIP
  $ hg bookmarks
     REVSET                    0:f7b1eb17ad24
   * TIP                       2:db815d6d32e6
     X2                        1:925d80f479bb
     Y                         2:db815d6d32e6
     Z                         0:f7b1eb17ad24

  $ hg bookmark -d REVSET
  $ hg bookmark -d TIP

rename without new name or multiple names

  $ hg bookmark -m Y
  abort: new bookmark name required
  [255]
  $ hg bookmark -m Y Y2 Y3
  abort: only one new bookmark name allowed
  [255]

delete without name

  $ hg bookmark -d
  abort: bookmark name required
  [255]

delete nonexistent bookmark

  $ hg bookmark -d A
  abort: bookmark 'A' does not exist
  [255]

bookmark name with spaces should be stripped

  $ hg bookmark ' x  y '

list bookmarks

  $ hg bookmarks
     X2                        1:925d80f479bb
     Y                         2:db815d6d32e6
     Z                         0:f7b1eb17ad24
   * x  y                      2:db815d6d32e6

look up stripped bookmark name

  $ hg log -r '"x  y"'
  changeset:   2:db815d6d32e6
  bookmark:    Y
  bookmark:    x  y
  tag:         tip
  parent:      0:f7b1eb17ad24
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     2
  

reject bookmark name with newline

  $ hg bookmark '
  > '
  abort: bookmark names cannot consist entirely of whitespace
  [255]

  $ hg bookmark -m Z '
  > '
  abort: bookmark names cannot consist entirely of whitespace
  [255]

bookmark with reserved name

  $ hg bookmark tip
  abort: the name 'tip' is reserved
  [255]

  $ hg bookmark .
  abort: the name '.' is reserved
  [255]

  $ hg bookmark null
  abort: the name 'null' is reserved
  [255]


bookmark with existing name

  $ hg bookmark X2
  abort: bookmark 'X2' already exists (use -f to force)
  [255]

  $ hg bookmark -m Y Z
  abort: bookmark 'Z' already exists (use -f to force)
  [255]

bookmark with name of branch

  $ hg bookmark default
  abort: a bookmark cannot have the name of an existing branch
  [255]

  $ hg bookmark -m Y default
  abort: a bookmark cannot have the name of an existing branch
  [255]

bookmark with integer name

  $ hg bookmark 10
  abort: cannot use an integer as a name
  [255]

incompatible options

  $ hg bookmark -m Y -d Z
  abort: --delete and --rename are incompatible
  [255]

  $ hg bookmark -r 1 -d Z
  abort: --rev is incompatible with --delete
  [255]

  $ hg bookmark -r 1 -m Z Y
  abort: --rev is incompatible with --rename
  [255]

force bookmark with existing name

  $ hg bookmark -f X2

force bookmark back to where it was, should deactivate it

  $ hg bookmark -fr1 X2
  $ hg bookmarks
     X2                        1:925d80f479bb
     Y                         2:db815d6d32e6
     Z                         0:f7b1eb17ad24
     x  y                      2:db815d6d32e6

forward bookmark to descendant without --force

  $ hg bookmark Z
  moving bookmark 'Z' forward from f7b1eb17ad24

list bookmarks

  $ hg bookmark
     X2                        1:925d80f479bb
     Y                         2:db815d6d32e6
   * Z                         2:db815d6d32e6
     x  y                      2:db815d6d32e6

revision but no bookmark name

  $ hg bookmark -r .
  abort: bookmark name required
  [255]

bookmark name with whitespace only

  $ hg bookmark ' '
  abort: bookmark names cannot consist entirely of whitespace
  [255]

  $ hg bookmark -m Y ' '
  abort: bookmark names cannot consist entirely of whitespace
  [255]

invalid bookmark

  $ hg bookmark 'foo:bar'
  abort: ':' cannot be used in a name
  [255]

  $ hg bookmark 'foo
  > bar'
  abort: '\n' cannot be used in a name
  [255]

the bookmark extension should be ignored now that it is part of core

  $ echo "[extensions]" >> $HGRCPATH
  $ echo "bookmarks=" >> $HGRCPATH
  $ hg bookmarks
     X2                        1:925d80f479bb
     Y                         2:db815d6d32e6
   * Z                         2:db815d6d32e6
     x  y                      2:db815d6d32e6

test summary

  $ hg summary
  parent: 2:db815d6d32e6 tip
   2
  branch: default
  bookmarks: *Z Y x  y
  commit: (clean)
  update: 1 new changesets, 2 branch heads (merge)
  phases: 3 draft

test id

  $ hg id
  db815d6d32e6 tip Y/Z/x  y

test rollback

  $ echo foo > f1
  $ hg bookmark tmp-rollback
  $ hg ci -Amr
  adding f1
  $ hg bookmarks
     X2                        1:925d80f479bb
     Y                         2:db815d6d32e6
     Z                         2:db815d6d32e6
   * tmp-rollback              3:2bf5cfec5864
     x  y                      2:db815d6d32e6
  $ hg rollback
  repository tip rolled back to revision 2 (undo commit)
  working directory now based on revision 2
  $ hg bookmarks
     X2                        1:925d80f479bb
     Y                         2:db815d6d32e6
     Z                         2:db815d6d32e6
   * tmp-rollback              2:db815d6d32e6
     x  y                      2:db815d6d32e6
  $ hg bookmark -f Z -r 1
  $ hg rollback
  repository tip rolled back to revision 2 (undo bookmark)
  $ hg bookmarks
     X2                        1:925d80f479bb
     Y                         2:db815d6d32e6
     Z                         2:db815d6d32e6
   * tmp-rollback              2:db815d6d32e6
     x  y                      2:db815d6d32e6
  $ hg bookmark -d tmp-rollback

activate bookmark on working dir parent without --force

  $ hg bookmark --inactive Z
  $ hg bookmark Z

test clone

  $ hg bookmark -r 2 -i @
  $ hg bookmark -r 2 -i a@
  $ hg bookmarks
     @                         2:db815d6d32e6
     X2                        1:925d80f479bb
     Y                         2:db815d6d32e6
   * Z                         2:db815d6d32e6
     a@                        2:db815d6d32e6
     x  y                      2:db815d6d32e6
  $ hg clone . cloned-bookmarks
  updating to bookmark @
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R cloned-bookmarks bookmarks
   * @                         2:db815d6d32e6
     X2                        1:925d80f479bb
     Y                         2:db815d6d32e6
     Z                         2:db815d6d32e6
     a@                        2:db815d6d32e6
     x  y                      2:db815d6d32e6

test clone with pull protocol

  $ hg clone --pull . cloned-bookmarks-pull
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 3 changes to 3 files (+1 heads)
  updating to bookmark @
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R cloned-bookmarks-pull bookmarks
   * @                         2:db815d6d32e6
     X2                        1:925d80f479bb
     Y                         2:db815d6d32e6
     Z                         2:db815d6d32e6
     a@                        2:db815d6d32e6
     x  y                      2:db815d6d32e6

delete multiple bookmarks at once

  $ hg bookmark -d @ a@

test clone with a bookmark named "default" (issue3677)

  $ hg bookmark -r 1 -f -i default
  $ hg clone . cloned-bookmark-default
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R cloned-bookmark-default bookmarks
     X2                        1:925d80f479bb
     Y                         2:db815d6d32e6
     Z                         2:db815d6d32e6
     default                   1:925d80f479bb
     x  y                      2:db815d6d32e6
  $ hg -R cloned-bookmark-default parents -q
  2:db815d6d32e6
  $ hg bookmark -d default

test clone with a specific revision

  $ hg clone -r 925d80 . cloned-bookmarks-rev
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R cloned-bookmarks-rev bookmarks
     X2                        1:925d80f479bb

test clone with update to a bookmark

  $ hg clone -u Z . ../cloned-bookmarks-update
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R ../cloned-bookmarks-update bookmarks
     X2                        1:925d80f479bb
     Y                         2:db815d6d32e6
   * Z                         2:db815d6d32e6
     x  y                      2:db815d6d32e6

create bundle with two heads

  $ hg clone . tobundle
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo x > tobundle/x
  $ hg -R tobundle add tobundle/x
  $ hg -R tobundle commit -m'x'
  $ hg -R tobundle update -r -2
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo y > tobundle/y
  $ hg -R tobundle branch test
  marked working directory as branch test
  (branches are permanent and global, did you want a bookmark?)
  $ hg -R tobundle add tobundle/y
  $ hg -R tobundle commit -m'y'
  $ hg -R tobundle bundle tobundle.hg
  searching for changes
  2 changesets found
  $ hg unbundle tobundle.hg
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files (+1 heads)
  (run 'hg heads' to see heads, 'hg merge' to merge)

update to active bookmark if it's not the parent

  $ hg summary
  parent: 2:db815d6d32e6 
   2
  branch: default
  bookmarks: *Z Y x  y
  commit: 1 added, 1 unknown (new branch head)
  update: 2 new changesets (update)
  phases: 5 draft
  $ hg update
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updating bookmark Z
  $ hg bookmarks
     X2                        1:925d80f479bb
     Y                         2:db815d6d32e6
   * Z                         3:125c9a1d6df6
     x  y                      2:db815d6d32e6

pull --update works the same as pull && update

  $ hg bookmark -r3 Y
  moving bookmark 'Y' forward from db815d6d32e6
  $ cp -r  ../cloned-bookmarks-update ../cloned-bookmarks-manual-update

(manual version)

  $ hg -R ../cloned-bookmarks-manual-update update Y
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (activating bookmark Y)
  $ hg -R ../cloned-bookmarks-manual-update pull .
  pulling from .
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files (+1 heads)
  updating bookmark Y
  updating bookmark Z
  (run 'hg heads' to see heads, 'hg merge' to merge)

(# tests strange but with --date crashing when bookmark have to move)

  $ hg -R ../cloned-bookmarks-manual-update update -d 1986
  abort: revision matching date not found
  [255]
  $ hg -R ../cloned-bookmarks-manual-update update
  updating to active bookmark Y
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (activating bookmark Y)

(all in one version)

  $ hg -R ../cloned-bookmarks-update update Y
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (activating bookmark Y)
  $ hg -R ../cloned-bookmarks-update pull --update .
  pulling from .
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files (+1 heads)
  updating bookmark Y
  updating bookmark Z
  updating to active bookmark Y
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

test wrongly formated bookmark

  $ echo '' >> .hg/bookmarks
  $ hg bookmarks
     X2                        1:925d80f479bb
     Y                         3:125c9a1d6df6
   * Z                         3:125c9a1d6df6
     x  y                      2:db815d6d32e6
  $ echo "Ican'thasformatedlines" >> .hg/bookmarks
  $ hg bookmarks
  malformed line in .hg/bookmarks: "Ican'thasformatedlines"
     X2                        1:925d80f479bb
     Y                         3:125c9a1d6df6
   * Z                         3:125c9a1d6df6
     x  y                      2:db815d6d32e6

test missing revisions

  $ echo "925d80f479bc z" > .hg/bookmarks
  $ hg book
  no bookmarks set

test stripping a non-checked-out but bookmarked revision

  $ hg log --graph
  o  changeset:   4:9ba5f110a0b3
  |  branch:      test
  |  tag:         tip
  |  parent:      2:db815d6d32e6
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     y
  |
  | @  changeset:   3:125c9a1d6df6
  |/   user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     x
  |
  o  changeset:   2:db815d6d32e6
  |  parent:      0:f7b1eb17ad24
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     2
  |
  | o  changeset:   1:925d80f479bb
  |/   user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     1
  |
  o  changeset:   0:f7b1eb17ad24
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     0
  
  $ hg book should-end-on-two
  $ hg co --clean 4
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  (leaving bookmark should-end-on-two)
  $ hg book four
  $ hg --config extensions.mq= strip 3
  saved backup bundle to * (glob)
should-end-on-two should end up pointing to revision 2, as that's the
tipmost surviving ancestor of the stripped revision.
  $ hg log --graph
  @  changeset:   3:9ba5f110a0b3
  |  branch:      test
  |  bookmark:    four
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     y
  |
  o  changeset:   2:db815d6d32e6
  |  bookmark:    should-end-on-two
  |  parent:      0:f7b1eb17ad24
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     2
  |
  | o  changeset:   1:925d80f479bb
  |/   user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     1
  |
  o  changeset:   0:f7b1eb17ad24
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     0
  
test non-linear update not clearing active bookmark

  $ hg up 1
  1 files updated, 0 files merged, 2 files removed, 0 files unresolved
  (leaving bookmark four)
  $ hg book drop
  $ hg up -C
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  (leaving bookmark drop)
  $ hg sum
  parent: 2:db815d6d32e6 
   2
  branch: default
  bookmarks: should-end-on-two
  commit: 2 unknown (clean)
  update: 1 new changesets, 2 branch heads (merge)
  phases: 4 draft
  $ hg book
     drop                      1:925d80f479bb
     four                      3:9ba5f110a0b3
     should-end-on-two         2:db815d6d32e6
  $ hg book -d drop
  $ hg up four
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (activating bookmark four)

no-op update doesn't deactive bookmarks

  $ hg up
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg sum
  parent: 3:9ba5f110a0b3 tip
   y
  branch: test
  bookmarks: *four
  commit: 2 unknown (clean)
  update: (current)
  phases: 4 draft

test clearing divergent bookmarks of linear ancestors

  $ hg bookmark Z -r 0
  $ hg bookmark Z@1 -r 1
  $ hg bookmark Z@2 -r 2
  $ hg bookmark Z@3 -r 3
  $ hg book
     Z                         0:f7b1eb17ad24
     Z@1                       1:925d80f479bb
     Z@2                       2:db815d6d32e6
     Z@3                       3:9ba5f110a0b3
   * four                      3:9ba5f110a0b3
     should-end-on-two         2:db815d6d32e6
  $ hg bookmark Z
  moving bookmark 'Z' forward from f7b1eb17ad24
  $ hg book
   * Z                         3:9ba5f110a0b3
     Z@1                       1:925d80f479bb
     four                      3:9ba5f110a0b3
     should-end-on-two         2:db815d6d32e6

test clearing only a single divergent bookmark across branches

  $ hg book foo -r 1
  $ hg book foo@1 -r 0
  $ hg book foo@2 -r 2
  $ hg book foo@3 -r 3
  $ hg book foo -r foo@3
  $ hg book
   * Z                         3:9ba5f110a0b3
     Z@1                       1:925d80f479bb
     foo                       3:9ba5f110a0b3
     foo@1                     0:f7b1eb17ad24
     foo@2                     2:db815d6d32e6
     four                      3:9ba5f110a0b3
     should-end-on-two         2:db815d6d32e6