$ mkdir -p t

  $ cd t

  $ cat <<EOF > merge

  > import sys, os

  > f = open(sys.argv[1], "wb")

  > f.write("merge %s %s %s" % (sys.argv[1], sys.argv[2], sys.argv[3]))

  > f.close()

  > EOF

perform a test merge with possible renaming

args:

$1 = action in local branch

$2 = action in remote branch

$3 = action in working dir

$4 = expected result

  $ tm()

  > {

  >     mkdir t

  >     cd t

  >     hg init

  >     echo "[merge]" >> .hg/hgrc

  >     echo "followcopies = 1" >> .hg/hgrc

  > 

  >     # base

  >     echo base > a

  >     echo base > rev # used to force commits

  >     hg add a rev

  >     hg ci -m "base"

  > 

  >     # remote

  >     echo remote > rev

  >     if [ "$2" != "" ] ; then $2 ; fi

  >     hg ci -m "remote"

  > 

  >     # local

  >     hg co -q 0

  >     echo local > rev

  >     if [ "$1" != "" ] ; then $1 ; fi

  >     hg ci -m "local"

  > 

  >     # working dir

  >     echo local > rev

  >     if [ "$3" != "" ] ; then $3 ; fi

  > 

  >     # merge

  >     echo "--------------"

  >     echo "test L:$1 R:$2 W:$3 - $4"

  >     echo "--------------"

  >     hg merge -y --debug --traceback --tool="python ../merge"

  > 

  >     echo "--------------"

  >     hg status -camC -X rev

  > 

  >     hg ci -m "merge"

  > 

  >     echo "--------------"

  >     echo

  > 

  >     cd ..

  >     rm -r t

  > }

  $ up() {

  >     cp rev $1

  >     hg add $1 2> /dev/null

  >     if [ "$2" != "" ] ; then

  >         cp rev $2

  >         hg add $2 2> /dev/null

  >     fi

  > }

  $ uc() { up $1; hg cp $1 $2; } # update + copy

  $ um() { up $1; hg mv $1 $2; }

  $ nc() { hg cp $1 $2; } # just copy

  $ nm() { hg mv $1 $2; } # just move

  $ tm "up a  " "nc a b" "      " "1  get local a to b"

  created new head

  --------------

  test L:up a   R:nc a b W:       - 1  get local a to b

  --------------

    searching for copies back to rev 1

    unmatched files in other:

     b

    all copies found (* = to merge, ! = divergent):

     b -> a *

    checking for directory renames

  resolving manifests

   overwrite None partial False

   ancestor 924404dff337 local e300d1c794ec+ remote 4ce40f5aca24

   rev: versions differ -> m

   a: remote copied to b -> m

  preserving a for resolve of b

  preserving rev for resolve of rev

  updating: a 1/2 files (50.00%)

  picked tool 'python ../merge' for b (binary False symlink False)

  merging a and b to b

  my b@e300d1c794ec+ other b@4ce40f5aca24 ancestor a@924404dff337

   premerge successful

  updating: rev 2/2 files (100.00%)

  picked tool 'python ../merge' for rev (binary False symlink False)

  merging rev

  my rev@e300d1c794ec+ other rev@4ce40f5aca24 ancestor rev@924404dff337

  0 files updated, 2 files merged, 0 files removed, 0 files unresolved

  (branch merge, don't forget to commit)

  --------------

  M b

    a

  C a

  --------------

  $ tm "nc a b" "up a  " "      " "2  get rem change to a and b"

  created new head

  --------------

  test L:nc a b R:up a   W:       - 2  get rem change to a and b

  --------------

    searching for copies back to rev 1

    unmatched files in local:

     b

    all copies found (* = to merge, ! = divergent):

     b -> a *

    checking for directory renames

  resolving manifests

   overwrite None partial False

   ancestor 924404dff337 local 86a2aa42fc76+ remote f4db7e329e71

   a: remote is newer -> g

   b: local copied/moved to a -> m

   rev: versions differ -> m

  preserving b for resolve of b

  preserving rev for resolve of rev

  updating: a 1/3 files (33.33%)

  getting a

  updating: b 2/3 files (66.67%)

  picked tool 'python ../merge' for b (binary False symlink False)

  merging b and a to b

  my b@86a2aa42fc76+ other a@f4db7e329e71 ancestor a@924404dff337

   premerge successful

  updating: rev 3/3 files (100.00%)

  picked tool 'python ../merge' for rev (binary False symlink False)

  merging rev

  my rev@86a2aa42fc76+ other rev@f4db7e329e71 ancestor rev@924404dff337

  1 files updated, 2 files merged, 0 files removed, 0 files unresolved

  (branch merge, don't forget to commit)

  --------------

  M a

  M b

    a

  --------------

  $ tm "up a  " "nm a b" "      " "3  get local a change to b, remove a"

  created new head

  --------------

  test L:up a   R:nm a b W:       - 3  get local a change to b, remove a

  --------------

    searching for copies back to rev 1

    unmatched files in other:

     b

    all copies found (* = to merge, ! = divergent):

     b -> a *

    checking for directory renames

  resolving manifests

   overwrite None partial False

   ancestor 924404dff337 local e300d1c794ec+ remote bdb19105162a

   rev: versions differ -> m

   a: remote moved to b -> m

  preserving a for resolve of b

  preserving rev for resolve of rev

  removing a

  updating: a 1/2 files (50.00%)

  picked tool 'python ../merge' for b (binary False symlink False)

  merging a and b to b

  my b@e300d1c794ec+ other b@bdb19105162a ancestor a@924404dff337

   premerge successful

  updating: rev 2/2 files (100.00%)

  picked tool 'python ../merge' for rev (binary False symlink False)

  merging rev

  my rev@e300d1c794ec+ other rev@bdb19105162a ancestor rev@924404dff337

  0 files updated, 2 files merged, 0 files removed, 0 files unresolved

  (branch merge, don't forget to commit)

  --------------

  M b

    a

  --------------

  $ tm "nm a b" "up a  " "      " "4  get remote change to b"

  created new head

  --------------

  test L:nm a b R:up a   W:       - 4  get remote change to b

  --------------

    searching for copies back to rev 1

    unmatched files in local:

     b

    all copies found (* = to merge, ! = divergent):

     b -> a *

    checking for directory renames

  resolving manifests

   overwrite None partial False

   ancestor 924404dff337 local 02963e448370+ remote f4db7e329e71

   b: local copied/moved to a -> m

   rev: versions differ -> m

  preserving b for resolve of b

  preserving rev for resolve of rev

  updating: b 1/2 files (50.00%)

  picked tool 'python ../merge' for b (binary False symlink False)

  merging b and a to b

  my b@02963e448370+ other a@f4db7e329e71 ancestor a@924404dff337

   premerge successful

  updating: rev 2/2 files (100.00%)

  picked tool 'python ../merge' for rev (binary False symlink False)

  merging rev

  my rev@02963e448370+ other rev@f4db7e329e71 ancestor rev@924404dff337

  0 files updated, 2 files merged, 0 files removed, 0 files unresolved

  (branch merge, don't forget to commit)

  --------------

  M b

    a

  --------------

  $ tm "      " "nc a b" "      " "5  get b"

  created new head

  --------------

  test L:       R:nc a b W:       - 5  get b

  --------------

    searching for copies back to rev 1

    unmatched files in other:

     b

    all copies found (* = to merge, ! = divergent):

     b -> a 

    checking for directory renames

  resolving manifests

   overwrite None partial False

   ancestor 924404dff337 local 94b33a1b7f2d+ remote 4ce40f5aca24

   rev: versions differ -> m

   b: remote created -> g

  preserving rev for resolve of rev

  updating: b 1/2 files (50.00%)

  getting b

  updating: rev 2/2 files (100.00%)

  picked tool 'python ../merge' for rev (binary False symlink False)

  merging rev

  my rev@94b33a1b7f2d+ other rev@4ce40f5aca24 ancestor rev@924404dff337

  1 files updated, 1 files merged, 0 files removed, 0 files unresolved

  (branch merge, don't forget to commit)

  --------------

  M b

  C a

  --------------

  $ tm "nc a b" "      " "      " "6  nothing"

  created new head

  --------------

  test L:nc a b R:       W:       - 6  nothing

  --------------

    searching for copies back to rev 1

    unmatched files in local:

     b

    all copies found (* = to merge, ! = divergent):

     b -> a 

    checking for directory renames

  resolving manifests

   overwrite None partial False

   ancestor 924404dff337 local 86a2aa42fc76+ remote 97c705ade336

   rev: versions differ -> m

  preserving rev for resolve of rev

  updating: rev 1/1 files (100.00%)

  picked tool 'python ../merge' for rev (binary False symlink False)

  merging rev

  my rev@86a2aa42fc76+ other rev@97c705ade336 ancestor rev@924404dff337

  0 files updated, 1 files merged, 0 files removed, 0 files unresolved

  (branch merge, don't forget to commit)

  --------------

  C a

  C b

  --------------

  $ tm "      " "nm a b" "      " "7  get b"

  created new head

  --------------

  test L:       R:nm a b W:       - 7  get b

  --------------

    searching for copies back to rev 1

    unmatched files in other:

     b

    all copies found (* = to merge, ! = divergent):

     b -> a 

    checking for directory renames

  resolving manifests

   overwrite None partial False

   ancestor 924404dff337 local 94b33a1b7f2d+ remote bdb19105162a

   a: other deleted -> r

   rev: versions differ -> m

   b: remote created -> g

  preserving rev for resolve of rev

  updating: a 1/3 files (33.33%)

  removing a

  updating: b 2/3 files (66.67%)

  getting b

  updating: rev 3/3 files (100.00%)

  picked tool 'python ../merge' for rev (binary False symlink False)

  merging rev

  my rev@94b33a1b7f2d+ other rev@bdb19105162a ancestor rev@924404dff337

  1 files updated, 1 files merged, 1 files removed, 0 files unresolved

  (branch merge, don't forget to commit)

  --------------

  M b

  --------------

  $ tm "nm a b" "      " "      " "8  nothing"

  created new head

  --------------

  test L:nm a b R:       W:       - 8  nothing

  --------------

    searching for copies back to rev 1

    unmatched files in local:

     b

    all copies found (* = to merge, ! = divergent):

     b -> a 

    checking for directory renames

  resolving manifests

   overwrite None partial False

   ancestor 924404dff337 local 02963e448370+ remote 97c705ade336

   rev: versions differ -> m

  preserving rev for resolve of rev

  updating: rev 1/1 files (100.00%)

  picked tool 'python ../merge' for rev (binary False symlink False)

  merging rev

  my rev@02963e448370+ other rev@97c705ade336 ancestor rev@924404dff337

  0 files updated, 1 files merged, 0 files removed, 0 files unresolved

  (branch merge, don't forget to commit)

  --------------

  C b

  --------------

  $ tm "um a b" "um a b" "      " "9  do merge with ancestor in a"

  created new head

  --------------

  test L:um a b R:um a b W:       - 9  do merge with ancestor in a

  --------------

    searching for copies back to rev 1

  resolving manifests

   overwrite None partial False

   ancestor 924404dff337 local 62e7bf090eba+ remote 49b6d8032493

   b: versions differ -> m

   rev: versions differ -> m

  preserving b for resolve of b

  preserving rev for resolve of rev

  updating: b 1/2 files (50.00%)

  picked tool 'python ../merge' for b (binary False symlink False)

  merging b

  my b@62e7bf090eba+ other b@49b6d8032493 ancestor a@924404dff337

  updating: rev 2/2 files (100.00%)

  picked tool 'python ../merge' for rev (binary False symlink False)

  merging rev

  my rev@62e7bf090eba+ other rev@49b6d8032493 ancestor rev@924404dff337

  0 files updated, 2 files merged, 0 files removed, 0 files unresolved

  (branch merge, don't forget to commit)

  --------------

  M b

  --------------

m "um a c" "um x c" "      " "10 do merge with no ancestor"

  $ tm "nm a b" "nm a c" "      " "11 get c, keep b"

  created new head

  --------------

  test L:nm a b R:nm a c W:       - 11 get c, keep b

  --------------

    searching for copies back to rev 1

    unmatched files in local:

     b

    unmatched files in other:

     c

    all copies found (* = to merge, ! = divergent):

     c -> a !

     b -> a !

    checking for directory renames

   a: divergent renames -> dr

  resolving manifests

   overwrite None partial False

   ancestor 924404dff337 local 02963e448370+ remote fe905ef2c33e

   rev: versions differ -> m

   c: remote created -> g

  preserving rev for resolve of rev

  updating: a 1/3 files (33.33%)

  note: possible conflict - a was renamed multiple times to:

   b

   c

  updating: c 2/3 files (66.67%)

  getting c

  updating: rev 3/3 files (100.00%)

  picked tool 'python ../merge' for rev (binary False symlink False)

  merging rev

  my rev@02963e448370+ other rev@fe905ef2c33e ancestor rev@924404dff337

  1 files updated, 1 files merged, 0 files removed, 0 files unresolved