$ cat > echo.py <<EOF

  > #!$PYTHON

  > from __future__ import absolute_import, print_function

  > import os

  > import sys

  > try:

  >     import msvcrt

  >     msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)

  >     msvcrt.setmode(sys.stderr.fileno(), os.O_BINARY)

  > except ImportError:

  >     pass

  > 

  > for k in ('HG_FILE', 'HG_MY_ISLINK', 'HG_OTHER_ISLINK', 'HG_BASE_ISLINK'):

  >     print(k, os.environ[k])

  > EOF

Create 2 heads containing the same file, once as

a file, once as a link. Bundle was generated with:

# hg init t

# cd t

# echo a > a

# hg ci -qAm t0 -d '0 0'

# echo l > l

# hg ci -qAm t1 -d '1 0'

# hg up -C 0

# ln -s a l

# hg ci -qAm t2 -d '2 0'

# echo l2 > l2

# hg ci -qAm t3 -d '3 0'

  $ hg init t

  $ cd t

  $ hg -q unbundle "$TESTDIR/bundles/test-merge-symlinks.hg"

  $ hg up -C 3

  3 files updated, 0 files merged, 0 files removed, 0 files unresolved

Merge them and display *_ISLINK vars

merge heads

  $ hg merge --tool="\"$PYTHON\" ../echo.py"

  merging l

  HG_FILE l

  HG_MY_ISLINK 1

  HG_OTHER_ISLINK 0

  HG_BASE_ISLINK 0

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

  (branch merge, don't forget to commit)

Test working directory symlink bit calculation wrt copies,

especially on non-supporting systems.

merge working directory

  $ hg up -C 2

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

  $ hg copy l l2

  $ HGMERGE="\"$PYTHON\" ../echo.py" hg up 3

  merging l2

  HG_FILE l2

  HG_MY_ISLINK 1

  HG_OTHER_ISLINK 0

  HG_BASE_ISLINK 0

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

  $ cd ..