view tests/test-strip-cross.t @ 17103:5146de7bce96

convert: keep branch switching merges with ancestors (issue3340)

When running convert with a filemap, merge parents which are ancestors
of other parents are ignored. This is hardly a problem when parents
belong to the same branch, but the result could be confusing when named
branches are involved. With:

  -o-a1-a2-a3...     <- A
    \           \
     b1-b2-b3...-m-  <- B

If all b* revisions are discarded, it is useful to preserve 'm' even if
it is empty after filtering to record the branch switch.

This patch makes filemap preserve "ancestor parents" if there is no
"non-ancestor parent" on the same branch than the merge revision.

Remarks:
- I am not completely convinced by the reasons given above and those
  detailed by Matt in this thread:

http://selenic.com/pipermail/mercurial-devel/2012-May/040627.html

  The properties we try to preserve are not clearly defined. That said,
  I know this patch already helped someone on IRC and the tests output
  look reasonable.

- This is a new version of the original "convert: filemap must preserve
  fast-forward merges" patch. It has exactly the same output for 2
  parents merges, the additional complexity is here to handle more than
  two parents.

test stripping of filelogs where the linkrev doesn't always increase

  $ echo '[extensions]' >> $HGRCPATH
  $ echo 'hgext.mq =' >> $HGRCPATH
  $ hg init orig
  $ cd orig
  $ commit()
  > {
  >     hg up -qC null
  >     count=1
  >     for i in "$@"; do
  >         for f in $i; do
  >             echo $count > $f
  >         done
  >         count=`expr $count + 1`
  >     done
  >     hg commit -qAm "$*"
  > }

2 1 0 2 0 1 2

  $ commit '201 210'
  $ commit '102 120' '210'
  $ commit '021'
  $ commit '201' '021 120'
  $ commit '012 021' '102 201' '120 210'
  $ commit 'manifest-file'
  $ commit '102 120' '012 210' '021 201'
  $ commit '201 210' '021 120' '012 102'
  $ HGUSER=another-user; export HGUSER
  $ commit 'manifest-file'
  $ commit '012' 'manifest-file'
  $ cd ..
  $ hg clone -q -U -r -1 -r -2 -r -3 -r -4 -r -6 orig crossed
  $ cd crossed
  $ hg debugindex --manifest
     rev    offset  length   base linkrev nodeid       p1           p2
       0         0     112      0       0 6f105cbb914d 000000000000 000000000000
       1       112      56      1       3 1b55917b3699 000000000000 000000000000
       2       168     123      1       1 8f3d04e263e5 000000000000 000000000000
       3       291     122      1       2 f0ef8726ac4f 000000000000 000000000000
       4       413      87      4       4 0b76e38b4070 000000000000 000000000000

  $ for i in 012 021 102 120 201 210 manifest-file; do
  >     echo $i
  >     hg debugindex $i
  >     echo
  > done
  012
     rev    offset  length   base linkrev nodeid       p1           p2
       0         0       3      0       0 b8e02f643373 000000000000 000000000000
       1         3       3      1       1 5d9299349fc0 000000000000 000000000000
       2         6       3      2       2 2661d26c6496 000000000000 000000000000
  
  021
     rev    offset  length   base linkrev nodeid       p1           p2
       0         0       3      0       0 b8e02f643373 000000000000 000000000000
       1         3       3      1       2 5d9299349fc0 000000000000 000000000000
       2         6       3      2       1 2661d26c6496 000000000000 000000000000
  
  102
     rev    offset  length   base linkrev nodeid       p1           p2
       0         0       3      0       1 b8e02f643373 000000000000 000000000000
       1         3       3      1       0 5d9299349fc0 000000000000 000000000000
       2         6       3      2       2 2661d26c6496 000000000000 000000000000
  
  120
     rev    offset  length   base linkrev nodeid       p1           p2
       0         0       3      0       1 b8e02f643373 000000000000 000000000000
       1         3       3      1       2 5d9299349fc0 000000000000 000000000000
       2         6       3      2       0 2661d26c6496 000000000000 000000000000
  
  201
     rev    offset  length   base linkrev nodeid       p1           p2
       0         0       3      0       2 b8e02f643373 000000000000 000000000000
       1         3       3      1       0 5d9299349fc0 000000000000 000000000000
       2         6       3      2       1 2661d26c6496 000000000000 000000000000
  
  210
     rev    offset  length   base linkrev nodeid       p1           p2
       0         0       3      0       2 b8e02f643373 000000000000 000000000000
       1         3       3      1       1 5d9299349fc0 000000000000 000000000000
       2         6       3      2       0 2661d26c6496 000000000000 000000000000
  
  manifest-file
     rev    offset  length   base linkrev nodeid       p1           p2
       0         0       3      0       3 b8e02f643373 000000000000 000000000000
       1         3       3      1       4 5d9299349fc0 000000000000 000000000000
  
  $ cd ..
  $ for i in 0 1 2 3 4; do
  >     hg clone -q -U --pull crossed $i
  >     echo "% Trying to strip revision $i"
  >     hg --cwd $i strip $i
  >     echo "% Verifying"
  >     hg --cwd $i verify
  >     echo
  > done
  % Trying to strip revision 0
  saved backup bundle to $TESTTMP/0/.hg/strip-backup/*-backup.hg (glob)
  % Verifying
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  7 files, 4 changesets, 15 total revisions
  
  % Trying to strip revision 1
  saved backup bundle to $TESTTMP/1/.hg/strip-backup/*-backup.hg (glob)
  % Verifying
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  7 files, 4 changesets, 14 total revisions
  
  % Trying to strip revision 2
  saved backup bundle to $TESTTMP/2/.hg/strip-backup/*-backup.hg (glob)
  % Verifying
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  7 files, 4 changesets, 14 total revisions
  
  % Trying to strip revision 3
  saved backup bundle to $TESTTMP/3/.hg/strip-backup/*-backup.hg (glob)
  % Verifying
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  7 files, 4 changesets, 19 total revisions
  
  % Trying to strip revision 4
  saved backup bundle to $TESTTMP/4/.hg/strip-backup/*-backup.hg (glob)
  % Verifying
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  7 files, 4 changesets, 19 total revisions