view tests/test-rebase-detach.t @ 26402:05871262acd5

treemanifest: rework lazy-copying code (issue4840)

The old lazy-copy code formed a chain of copied manifests with each
copy. Under typical operation, the stack never got more than a couple
of manifests deep and was fine. Under conditions like hgsubversion or
convert, the stack could get hundreds of manifests deep, and
eventually overflow the recursion limit for Python. I was able to
consistently reproduce this by converting an hgsubversion clone of
svn's history to treemanifests.

This may result in fewer manifests staying in memory during operations
like convert when treemanifests are in use, and should make those
operations faster since there will be significantly fewer noop
function calls going on.

A previous attempt (never mailed) of mine to fix this problem tried to
simply have all treemanifests only have a loadfunc - that caused
somewhat weird problems because the gettext() callable passed into
read() wasn't idempotent, so the easy solution is to have a loadfunc
and a copyfunc.

  $ cat >> $HGRCPATH <<EOF
  > [extensions]
  > rebase=
  > 
  > [phases]
  > publish=False
  > 
  > [alias]
  > tglog = log -G --template "{rev}: '{desc}' {branches}\n"
  > EOF


  $ hg init a
  $ cd a
  $ hg unbundle "$TESTDIR/bundles/rebase.hg"
  adding changesets
  adding manifests
  adding file changes
  added 8 changesets with 7 changes to 7 files (+2 heads)
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg up tip
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ cd ..


Rebasing D onto H detaching from C:

  $ hg clone -q -u . a a1
  $ cd a1

  $ hg tglog
  @  7: 'H'
  |
  | o  6: 'G'
  |/|
  o |  5: 'F'
  | |
  | o  4: 'E'
  |/
  | o  3: 'D'
  | |
  | o  2: 'C'
  | |
  | o  1: 'B'
  |/
  o  0: 'A'
  
  $ hg phase --force --secret 3
  $ hg rebase -s 3 -d 7
  rebasing 3:32af7686d403 "D"
  saved backup bundle to $TESTTMP/a1/.hg/strip-backup/32af7686d403-6f7dface-backup.hg (glob)

  $ hg log -G --template "{rev}:{phase} '{desc}' {branches}\n"
  o  7:secret 'D'
  |
  @  6:draft 'H'
  |
  | o  5:draft 'G'
  |/|
  o |  4:draft 'F'
  | |
  | o  3:draft 'E'
  |/
  | o  2:draft 'C'
  | |
  | o  1:draft 'B'
  |/
  o  0:draft 'A'
  
  $ hg manifest --rev tip
  A
  D
  F
  H

  $ cd ..


Rebasing C onto H detaching from B:

  $ hg clone -q -u . a a2
  $ cd a2

  $ hg tglog
  @  7: 'H'
  |
  | o  6: 'G'
  |/|
  o |  5: 'F'
  | |
  | o  4: 'E'
  |/
  | o  3: 'D'
  | |
  | o  2: 'C'
  | |
  | o  1: 'B'
  |/
  o  0: 'A'
  
  $ hg rebase -s 2 -d 7
  rebasing 2:5fddd98957c8 "C"
  rebasing 3:32af7686d403 "D"
  saved backup bundle to $TESTTMP/a2/.hg/strip-backup/5fddd98957c8-f9244fa1-backup.hg (glob)

  $ hg tglog
  o  7: 'D'
  |
  o  6: 'C'
  |
  @  5: 'H'
  |
  | o  4: 'G'
  |/|
  o |  3: 'F'
  | |
  | o  2: 'E'
  |/
  | o  1: 'B'
  |/
  o  0: 'A'
  
  $ hg manifest --rev tip
  A
  C
  D
  F
  H

  $ cd ..


Rebasing B onto H using detach (same as not using it):

  $ hg clone -q -u . a a3
  $ cd a3

  $ hg tglog
  @  7: 'H'
  |
  | o  6: 'G'
  |/|
  o |  5: 'F'
  | |
  | o  4: 'E'
  |/
  | o  3: 'D'
  | |
  | o  2: 'C'
  | |
  | o  1: 'B'
  |/
  o  0: 'A'
  
  $ hg rebase -s 1 -d 7
  rebasing 1:42ccdea3bb16 "B"
  rebasing 2:5fddd98957c8 "C"
  rebasing 3:32af7686d403 "D"
  saved backup bundle to $TESTTMP/a3/.hg/strip-backup/42ccdea3bb16-3cb021d3-backup.hg (glob)

  $ hg tglog
  o  7: 'D'
  |
  o  6: 'C'
  |
  o  5: 'B'
  |
  @  4: 'H'
  |
  | o  3: 'G'
  |/|
  o |  2: 'F'
  | |
  | o  1: 'E'
  |/
  o  0: 'A'
  
  $ hg manifest --rev tip
  A
  B
  C
  D
  F
  H

  $ cd ..


Rebasing C onto H detaching from B and collapsing:

  $ hg clone -q -u . a a4
  $ cd a4
  $ hg phase --force --secret 3

  $ hg tglog
  @  7: 'H'
  |
  | o  6: 'G'
  |/|
  o |  5: 'F'
  | |
  | o  4: 'E'
  |/
  | o  3: 'D'
  | |
  | o  2: 'C'
  | |
  | o  1: 'B'
  |/
  o  0: 'A'
  
  $ hg rebase --collapse -s 2 -d 7
  rebasing 2:5fddd98957c8 "C"
  note: rebase of 2:5fddd98957c8 created no changes to commit
  rebasing 3:32af7686d403 "D"
  note: rebase of 3:32af7686d403 created no changes to commit
  saved backup bundle to $TESTTMP/a4/.hg/strip-backup/5fddd98957c8-f9244fa1-backup.hg (glob)

  $ hg  log -G --template "{rev}:{phase} '{desc}' {branches}\n"
  o  6:secret 'Collapsed revision
  |  * C
  |  * D'
  @  5:draft 'H'
  |
  | o  4:draft 'G'
  |/|
  o |  3:draft 'F'
  | |
  | o  2:draft 'E'
  |/
  | o  1:draft 'B'
  |/
  o  0:draft 'A'
  
  $ hg manifest --rev tip
  A
  C
  D
  F
  H

  $ cd ..

Rebasing across null as ancestor
  $ hg clone -q -U a a5

  $ cd a5

  $ echo x > x

  $ hg add x

  $ hg ci -m "extra branch"
  created new head

  $ hg tglog
  @  8: 'extra branch'
  
  o  7: 'H'
  |
  | o  6: 'G'
  |/|
  o |  5: 'F'
  | |
  | o  4: 'E'
  |/
  | o  3: 'D'
  | |
  | o  2: 'C'
  | |
  | o  1: 'B'
  |/
  o  0: 'A'
  
  $ hg rebase -s 1 -d tip
  rebasing 1:42ccdea3bb16 "B"
  rebasing 2:5fddd98957c8 "C"
  rebasing 3:32af7686d403 "D"
  saved backup bundle to $TESTTMP/a5/.hg/strip-backup/42ccdea3bb16-3cb021d3-backup.hg (glob)

  $ hg tglog
  o  8: 'D'
  |
  o  7: 'C'
  |
  o  6: 'B'
  |
  @  5: 'extra branch'
  
  o  4: 'H'
  |
  | o  3: 'G'
  |/|
  o |  2: 'F'
  | |
  | o  1: 'E'
  |/
  o  0: 'A'
  

  $ hg rebase -d 5 -s 7
  rebasing 7:13547172c9c0 "C"
  rebasing 8:4e27a76c371a "D" (tip)
  saved backup bundle to $TESTTMP/a5/.hg/strip-backup/13547172c9c0-35685ded-backup.hg (glob)
  $ hg tglog
  o  8: 'D'
  |
  o  7: 'C'
  |
  | o  6: 'B'
  |/
  @  5: 'extra branch'
  
  o  4: 'H'
  |
  | o  3: 'G'
  |/|
  o |  2: 'F'
  | |
  | o  1: 'E'
  |/
  o  0: 'A'
  
  $ cd ..

Verify that target is not selected as external rev (issue3085)

  $ hg clone -q -U a a6
  $ cd a6
  $ hg up -q 6

  $ echo "I" >> E
  $ hg ci -m "I"
  $ hg merge 7
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg ci -m "Merge"
  $ echo "J" >> F
  $ hg ci -m "J"

  $ hg rebase -s 8 -d 7 --collapse --config ui.merge=internal:other
  rebasing 8:9790e768172d "I"
  note: rebase of 8:9790e768172d created no changes to commit
  rebasing 9:5d7b11f5fb97 "Merge"
  note: rebase of 9:5d7b11f5fb97 created no changes to commit
  rebasing 10:9427d4d5af81 "J" (tip)
  note: rebase of 10:9427d4d5af81 created no changes to commit
  saved backup bundle to $TESTTMP/a6/.hg/strip-backup/9790e768172d-c2111e9d-backup.hg (glob)

  $ hg tglog
  @  8: 'Collapsed revision
  |  * I
  |  * Merge
  |  * J'
  o  7: 'H'
  |
  | o  6: 'G'
  |/|
  o |  5: 'F'
  | |
  | o  4: 'E'
  |/
  | o  3: 'D'
  | |
  | o  2: 'C'
  | |
  | o  1: 'B'
  |/
  o  0: 'A'
  

  $ hg log --rev tip
  changeset:   8:9472f4b1d736
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     Collapsed revision
  

  $ cd ..

Ensure --continue restores a correct state (issue3046) and phase:
  $ hg clone -q a a7
  $ cd a7
  $ hg up -q 3
  $ echo 'H2' > H
  $ hg ci -A -m 'H2'
  adding H
  $ hg phase --force --secret 8
  $ hg rebase -s 8 -d 7 --config ui.merge=internal:fail
  rebasing 8:6215fafa5447 "H2" (tip)
  merging H
  warning: conflicts during merge.
  merging H incomplete! (edit conflicts, then use 'hg resolve --mark')
  unresolved conflicts (see hg resolve, then hg rebase --continue)
  [1]
  $ hg resolve --all -t internal:local
  (no more unresolved files)
  $ hg rebase -c
  rebasing 8:6215fafa5447 "H2" (tip)
  note: rebase of 8:6215fafa5447 created no changes to commit
  saved backup bundle to $TESTTMP/a7/.hg/strip-backup/6215fafa5447-5804ebd5-backup.hg (glob)
  $ hg  log -G --template "{rev}:{phase} '{desc}' {branches}\n"
  @  7:draft 'H'
  |
  | o  6:draft 'G'
  |/|
  o |  5:draft 'F'
  | |
  | o  4:draft 'E'
  |/
  | o  3:draft 'D'
  | |
  | o  2:draft 'C'
  | |
  | o  1:draft 'B'
  |/
  o  0:draft 'A'
  

  $ cd ..