view tests/test-convert-cvs.t @ 32200:4d504e541d3d

rebase: use matcher to optimize manifestmerge

The old merge code would call manifestmerge and calculate the complete diff
between the source to the destination. In many cases, like rebase, the vast
majority of differences between the source and destination are irrelevant
because they are differences between the destination and the common ancestor
only, and therefore don't affect the merge. Since most actions are 'keep', all
the effort to compute them is wasted.

Instead, let's compute the difference between the source and the common ancestor
and only perform the diff of those files against the merge destination. When
using treemanifest, this lets us avoid loading almost the entire tree when
rebasing from a very old ancestor. This speeds up rebase of an old stack of 27
commits by 20x.

In mozilla-central, without treemanifest, when rebasing a commit from
default~100000 to default, this speeds up the manifestmerge step from 2.6s to
1.2s.  However, the additional diff adds an overhead to all manifestmerge calls,
especially for flat manifests. When rebasing a commit from default~1 to default
it appears to add 100ms in mozilla-central. While we could put this optimization
behind a flag, I think the fact that it makes merge O(number of changes being
applied) instead of O(number of changes between X and Y) justifies it.

#require cvs

  $ cvscall()
  > {
  >     cvs -f "$@"
  > }
  $ hgcat()
  > {
  >     hg --cwd src-hg cat -r tip "$1"
  > }
  $ echo "[extensions]" >> $HGRCPATH
  $ echo "convert = " >> $HGRCPATH
  $ cat > cvshooks.py <<EOF
  > def cvslog(ui,repo,hooktype,log):
  >     print "%s hook: %d entries"%(hooktype,len(log))
  > 
  > def cvschangesets(ui,repo,hooktype,changesets):
  >     print "%s hook: %d changesets"%(hooktype,len(changesets))
  > EOF
  $ hookpath=`pwd`
  $ cat <<EOF >> $HGRCPATH
  > [hooks]
  > cvslog = python:$hookpath/cvshooks.py:cvslog
  > cvschangesets = python:$hookpath/cvshooks.py:cvschangesets
  > EOF

create cvs repository

  $ mkdir cvsrepo
  $ cd cvsrepo
  $ CVSROOT=`pwd`
  $ export CVSROOT
  $ CVS_OPTIONS=-f
  $ export CVS_OPTIONS
  $ cd ..
  $ rmdir cvsrepo
  $ cvscall -q -d "$CVSROOT" init

create source directory

  $ mkdir src-temp
  $ cd src-temp
  $ echo a > a
  $ mkdir b
  $ cd b
  $ echo c > c
  $ cd ..

import source directory

  $ cvscall -q import -m import src INITIAL start
  N src/a
  N src/b/c
  
  No conflicts created by this import
  
  $ cd ..

checkout source directory

  $ cvscall -q checkout src
  U src/a
  U src/b/c

commit a new revision changing b/c

  $ cd src
  $ sleep 1
  $ echo c >> b/c
  $ cvscall -q commit -mci0 . | grep '<--'
  $TESTTMP/cvsrepo/src/b/c,v  <--  *c (glob)
  $ cd ..

convert fresh repo and also check localtimezone option

NOTE: This doesn't check all time zones -- it merely determines that
the configuration option is taking effect.

An arbitrary (U.S.) time zone is used here.  TZ=US/Hawaii is selected
since it does not use DST (unlike other U.S. time zones) and is always
a fixed difference from UTC.

  $ TZ=US/Hawaii hg convert --config convert.localtimezone=True src src-hg
  initializing destination src-hg repository
  connecting to $TESTTMP/cvsrepo
  scanning source...
  collecting CVS rlog
  5 log entries
  cvslog hook: 5 entries
  creating changesets
  3 changeset entries
  cvschangesets hook: 3 changesets
  sorting...
  converting...
  2 Initial revision
  1 ci0
  0 import
  updating tags
  $ hgcat a
  a
  $ hgcat b/c
  c
  c

convert fresh repo with --filemap

  $ echo include b/c > filemap
  $ hg convert --filemap filemap src src-filemap
  initializing destination src-filemap repository
  connecting to $TESTTMP/cvsrepo
  scanning source...
  collecting CVS rlog
  5 log entries
  cvslog hook: 5 entries
  creating changesets
  3 changeset entries
  cvschangesets hook: 3 changesets
  sorting...
  converting...
  2 Initial revision
  1 ci0
  0 import
  filtering out empty revision
  repository tip rolled back to revision 1 (undo convert)
  updating tags
  $ hgcat b/c
  c
  c
  $ hg -R src-filemap log --template '{rev} {desc} files: {files}\n'
  2 update tags files: .hgtags
  1 ci0 files: b/c
  0 Initial revision files: b/c

convert full repository (issue1649)

  $ cvscall -q -d "$CVSROOT" checkout -d srcfull "." | grep -v CVSROOT
  U srcfull/src/a
  U srcfull/src/b/c
  $ ls srcfull
  CVS
  CVSROOT
  src
  $ hg convert srcfull srcfull-hg \
  >     | grep -v 'log entries' | grep -v 'hook:' \
  >     | grep -v '^[0-3] .*' # filter instable changeset order
  initializing destination srcfull-hg repository
  connecting to $TESTTMP/cvsrepo
  scanning source...
  collecting CVS rlog
  creating changesets
  4 changeset entries
  sorting...
  converting...
  updating tags
  $ hg cat -r tip --cwd srcfull-hg src/a
  a
  $ hg cat -r tip --cwd srcfull-hg src/b/c
  c
  c

commit new file revisions

  $ cd src
  $ echo a >> a
  $ echo c >> b/c
  $ cvscall -q commit -mci1 . | grep '<--'
  $TESTTMP/cvsrepo/src/a,v  <--  a
  $TESTTMP/cvsrepo/src/b/c,v  <--  *c (glob)
  $ cd ..

convert again

  $ TZ=US/Hawaii hg convert --config convert.localtimezone=True src src-hg
  connecting to $TESTTMP/cvsrepo
  scanning source...
  collecting CVS rlog
  7 log entries
  cvslog hook: 7 entries
  creating changesets
  4 changeset entries
  cvschangesets hook: 4 changesets
  sorting...
  converting...
  0 ci1
  $ hgcat a
  a
  a
  $ hgcat b/c
  c
  c
  c

convert again with --filemap

  $ hg convert --filemap filemap src src-filemap
  connecting to $TESTTMP/cvsrepo
  scanning source...
  collecting CVS rlog
  7 log entries
  cvslog hook: 7 entries
  creating changesets
  4 changeset entries
  cvschangesets hook: 4 changesets
  sorting...
  converting...
  0 ci1
  $ hgcat b/c
  c
  c
  c
  $ hg -R src-filemap log --template '{rev} {desc} files: {files}\n'
  3 ci1 files: b/c
  2 update tags files: .hgtags
  1 ci0 files: b/c
  0 Initial revision files: b/c

commit branch

  $ cd src
  $ cvs -q update -r1.1 b/c
  U b/c
  $ cvs -q tag -b branch
  T a
  T b/c
  $ cvs -q update -r branch > /dev/null
  $ sleep 1
  $ echo d >> b/c
  $ cvs -q commit -mci2 . | grep '<--'
  $TESTTMP/cvsrepo/src/b/c,v  <--  *c (glob)
  $ cd ..

convert again

  $ TZ=US/Hawaii hg convert --config convert.localtimezone=True src src-hg
  connecting to $TESTTMP/cvsrepo
  scanning source...
  collecting CVS rlog
  8 log entries
  cvslog hook: 8 entries
  creating changesets
  5 changeset entries
  cvschangesets hook: 5 changesets
  sorting...
  converting...
  0 ci2
  $ hgcat b/c
  c
  d

convert again with --filemap

  $ TZ=US/Hawaii hg convert --config convert.localtimezone=True --filemap filemap src src-filemap
  connecting to $TESTTMP/cvsrepo
  scanning source...
  collecting CVS rlog
  8 log entries
  cvslog hook: 8 entries
  creating changesets
  5 changeset entries
  cvschangesets hook: 5 changesets
  sorting...
  converting...
  0 ci2
  $ hgcat b/c
  c
  d
  $ hg -R src-filemap log --template '{rev} {desc} files: {files}\n'
  4 ci2 files: b/c
  3 ci1 files: b/c
  2 update tags files: .hgtags
  1 ci0 files: b/c
  0 Initial revision files: b/c

commit a new revision with funny log message

  $ cd src
  $ sleep 1
  $ echo e >> a
  $ cvscall -q commit -m'funny
  > ----------------------------
  > log message' . | grep '<--' |\
  >  sed -e 's:.*src/\(.*\),v.*:checking in src/\1,v:g'
  checking in src/a,v

commit new file revisions with some fuzz

  $ sleep 1
  $ echo f >> a
  $ cvscall -q commit -mfuzzy . | grep '<--'
  $TESTTMP/cvsrepo/src/a,v  <--  a
  $ sleep 4 # the two changes will be split if fuzz < 4
  $ echo g >> b/c
  $ cvscall -q commit -mfuzzy . | grep '<--'
  $TESTTMP/cvsrepo/src/b/c,v  <--  *c (glob)
  $ cd ..

convert again

  $ TZ=US/Hawaii hg convert --config convert.cvsps.fuzz=2 --config convert.localtimezone=True src src-hg
  connecting to $TESTTMP/cvsrepo
  scanning source...
  collecting CVS rlog
  11 log entries
  cvslog hook: 11 entries
  creating changesets
  8 changeset entries
  cvschangesets hook: 8 changesets
  sorting...
  converting...
  2 funny
  1 fuzzy
  0 fuzzy
  $ hg -R src-hg log -G --template '{rev} ({branches}) {desc} date: {date|date} files: {files}\n'
  o  8 (branch) fuzzy date: * -1000 files: b/c (glob)
  |
  o  7 (branch) fuzzy date: * -1000 files: a (glob)
  |
  o  6 (branch) funny
  |  ----------------------------
  |  log message date: * -1000 files: a (glob)
  o  5 (branch) ci2 date: * -1000 files: b/c (glob)
  
  o  4 () ci1 date: * -1000 files: a b/c (glob)
  |
  o  3 () update tags date: * +0000 files: .hgtags (glob)
  |
  | o  2 (INITIAL) import date: * -1000 files: (glob)
  | |
  o |  1 () ci0 date: * -1000 files: b/c (glob)
  |/
  o  0 () Initial revision date: * -1000 files: a b/c (glob)
  

testing debugcvsps

  $ cd src
  $ hg debugcvsps --fuzz=2 -x >/dev/null

commit a new revision changing a and removing b/c

  $ cvscall -q update -A
  U a
  U b/c
  $ sleep 1
  $ echo h >> a
  $ cvscall -Q remove -f b/c
  $ cvscall -q commit -mci | grep '<--'
  $TESTTMP/cvsrepo/src/a,v  <--  a
  $TESTTMP/cvsrepo/src/b/c,v  <--  *c (glob)

update and verify the cvsps cache

  $ hg debugcvsps --fuzz=2 -u
  collecting CVS rlog
  13 log entries
  cvslog hook: 13 entries
  creating changesets
  11 changeset entries
  cvschangesets hook: 11 changesets
  ---------------------
  PatchSet 1 
  Date: * (glob)
  Author: * (glob)
  Branch: HEAD
  Tag: (none) 
  Branchpoints: INITIAL 
  Log:
  Initial revision
  
  Members: 
  	a:INITIAL->1.1 
  
  ---------------------
  PatchSet 2 
  Date: * (glob)
  Author: * (glob)
  Branch: HEAD
  Tag: (none) 
  Branchpoints: INITIAL, branch 
  Log:
  Initial revision
  
  Members: 
  	b/c:INITIAL->1.1 
  
  ---------------------
  PatchSet 3 
  Date: * (glob)
  Author: * (glob)
  Branch: INITIAL
  Tag: start 
  Log:
  import
  
  Members: 
  	a:1.1->1.1.1.1 
  	b/c:1.1->1.1.1.1 
  
  ---------------------
  PatchSet 4 
  Date: * (glob)
  Author: * (glob)
  Branch: HEAD
  Tag: (none) 
  Log:
  ci0
  
  Members: 
  	b/c:1.1->1.2 
  
  ---------------------
  PatchSet 5 
  Date: * (glob)
  Author: * (glob)
  Branch: HEAD
  Tag: (none) 
  Branchpoints: branch 
  Log:
  ci1
  
  Members: 
  	a:1.1->1.2 
  
  ---------------------
  PatchSet 6 
  Date: * (glob)
  Author: * (glob)
  Branch: HEAD
  Tag: (none) 
  Log:
  ci1
  
  Members: 
  	b/c:1.2->1.3 
  
  ---------------------
  PatchSet 7 
  Date: * (glob)
  Author: * (glob)
  Branch: branch
  Tag: (none) 
  Log:
  ci2
  
  Members: 
  	b/c:1.1->1.1.2.1 
  
  ---------------------
  PatchSet 8 
  Date: * (glob)
  Author: * (glob)
  Branch: branch
  Tag: (none) 
  Log:
  funny
  ----------------------------
  log message
  
  Members: 
  	a:1.2->1.2.2.1 
  
  ---------------------
  PatchSet 9 
  Date: * (glob)
  Author: * (glob)
  Branch: branch
  Tag: (none) 
  Log:
  fuzzy
  
  Members: 
  	a:1.2.2.1->1.2.2.2 
  
  ---------------------
  PatchSet 10 
  Date: * (glob)
  Author: * (glob)
  Branch: branch
  Tag: (none) 
  Log:
  fuzzy
  
  Members: 
  	b/c:1.1.2.1->1.1.2.2 
  
  ---------------------
  PatchSet 11 
  Date: * (glob)
  Author: * (glob)
  Branch: HEAD
  Tag: (none) 
  Log:
  ci
  
  Members: 
  	a:1.2->1.3 
  	b/c:1.3->1.4(DEAD) 
  

  $ cd ..