#require symlink execbit

  $ tellmeabout() {

  > if [ -h $1 ]; then

  >     echo $1 is a symlink:

  >     $TESTDIR/readlink.py $1

  > elif [ -x $1 ]; then

  >     echo $1 is an executable file with content:

  >     cat $1

  > else

  >     echo $1 is a plain file with content:

  >     cat $1

  > fi

  > }

  $ hg init test1

  $ cd test1

  $ echo a > a

  $ hg ci -Aqmadd

  $ chmod +x a

  $ hg ci -mexecutable

  $ hg up -q 0

  $ rm a

  $ ln -s symlink a

  $ hg ci -msymlink

  created new head

Symlink is local parent, executable is other:

  $ hg merge --debug

    searching for copies back to rev 1

  resolving manifests

   branchmerge: True, force: False, partial: False

   ancestor: c334dc3be0da, local: 521a1e40188f+, remote: 3574f3e69b1c

   preserving a for resolve of a

   a: versions differ -> m (premerge)

  picked tool ':merge' for a (binary False symlink True changedelete False)

  merging a

  my a@521a1e40188f+ other a@3574f3e69b1c ancestor a@c334dc3be0da

  warning: internal :merge cannot merge symlinks for a

  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')

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

  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

  [1]

  $ tellmeabout a

  a is a symlink:

  a -> symlink

  $ hg resolve a --tool internal:other

  (no more unresolved files)

  $ tellmeabout a

  a is an executable file with content:

  a

  $ hg st

  M a

  ? a.orig

Symlink is other parent, executable is local:

  $ hg update -C 1

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

  $ hg merge --debug --tool :union

    searching for copies back to rev 1

  resolving manifests

   branchmerge: True, force: False, partial: False

   ancestor: c334dc3be0da, local: 3574f3e69b1c+, remote: 521a1e40188f

   preserving a for resolve of a

   a: versions differ -> m (premerge)

  picked tool ':union' for a (binary False symlink True changedelete False)

  merging a

  my a@3574f3e69b1c+ other a@521a1e40188f ancestor a@c334dc3be0da

  warning: internal :union cannot merge symlinks for a

  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')

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

  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

  [1]

  $ tellmeabout a

  a is an executable file with content:

  a

  $ hg update -C 1

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

  $ hg merge --debug --tool :merge3

    searching for copies back to rev 1

  resolving manifests

   branchmerge: True, force: False, partial: False

   ancestor: c334dc3be0da, local: 3574f3e69b1c+, remote: 521a1e40188f

   preserving a for resolve of a

   a: versions differ -> m (premerge)

  picked tool ':merge3' for a (binary False symlink True changedelete False)

  merging a

  my a@3574f3e69b1c+ other a@521a1e40188f ancestor a@c334dc3be0da

  warning: internal :merge3 cannot merge symlinks for a

  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')

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

  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

  [1]

  $ tellmeabout a

  a is an executable file with content:

  a

  $ hg update -C 1

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

  $ hg merge --debug --tool :merge-local

    searching for copies back to rev 1

  resolving manifests

   branchmerge: True, force: False, partial: False

   ancestor: c334dc3be0da, local: 3574f3e69b1c+, remote: 521a1e40188f

   preserving a for resolve of a

   a: versions differ -> m (premerge)

  picked tool ':merge-local' for a (binary False symlink True changedelete False)

  merging a

  my a@3574f3e69b1c+ other a@521a1e40188f ancestor a@c334dc3be0da

  warning: internal :merge-local cannot merge symlinks for a

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

  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

  [1]

  $ tellmeabout a

  a is an executable file with content:

  a

  $ hg update -C 1

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

  $ hg merge --debug --tool :merge-other

    searching for copies back to rev 1

  resolving manifests

   branchmerge: True, force: False, partial: False

   ancestor: c334dc3be0da, local: 3574f3e69b1c+, remote: 521a1e40188f

   preserving a for resolve of a

   a: versions differ -> m (premerge)

  picked tool ':merge-other' for a (binary False symlink True changedelete False)

  merging a

  my a@3574f3e69b1c+ other a@521a1e40188f ancestor a@c334dc3be0da

  warning: internal :merge-other cannot merge symlinks for a

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

  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

  [1]

  $ tellmeabout a

  a is an executable file with content:

  a

Update to link without local change should get us a symlink (issue3316):

  $ hg up -C 0

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

  $ hg up

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

  1 other heads for branch "default"

  $ hg st

  ? a.orig

Update to link with local change should cause a merge prompt (issue3200):

  $ hg up -Cq 0

  $ echo data > a

  $ HGMERGE= hg up -y --debug

    searching for copies back to rev 2

  resolving manifests

   branchmerge: False, force: False, partial: False

   ancestor: c334dc3be0da, local: c334dc3be0da+, remote: 521a1e40188f

   preserving a for resolve of a

   a: versions differ -> m (premerge)

  (couldn't find merge tool hgmerge|tool hgmerge can't handle symlinks) (re)

  picked tool ':prompt' for a (binary False symlink True changedelete False)

  no tool found to merge a

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

  use 'hg resolve' to retry unresolved file merges

  1 other heads for branch "default"

  [1]

  $ hg diff --git

  diff --git a/a b/a

  old mode 120000

  new mode 100644

  --- a/a

  +++ b/a

  @@ -1,1 +1,1 @@

  -symlink

  \ No newline at end of file

  +data

Test only 'l' change - happens rarely, except when recovering from situations

where that was what happened.

  $ hg init test2

  $ cd test2

  $ printf base > f

  $ hg ci -Aqm0

  $ echo file > f

  $ echo content >> f

  $ hg ci -qm1

  $ hg up -qr0

  $ rm f

  $ ln -s base f

  $ hg ci -qm2

  $ hg merge

  merging f

  warning: internal :merge cannot merge symlinks for f

  warning: conflicts while merging f! (edit, then use 'hg resolve --mark')

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

  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

  [1]

  $ tellmeabout f

  f is a symlink:

  f -> base

  $ hg up -Cqr1

  $ hg merge

  merging f

  warning: internal :merge cannot merge symlinks for f

  warning: conflicts while merging f! (edit, then use 'hg resolve --mark')

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

  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

  [1]

  $ tellmeabout f

  f is a plain file with content:

  file

  content

  $ cd ..

Test removed 'x' flag merged with change to symlink

  $ hg init test3

  $ cd test3

  $ echo f > f

  $ chmod +x f

  $ hg ci -Aqm0

  $ chmod -x f

  $ hg ci -qm1

  $ hg up -qr0

  $ rm f

  $ ln -s dangling f

  $ hg ci -qm2

  $ hg merge

  merging f

  warning: internal :merge cannot merge symlinks for f

  warning: conflicts while merging f! (edit, then use 'hg resolve --mark')

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

  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

  [1]

  $ tellmeabout f

  f is a symlink:

  f -> dangling

  $ hg up -Cqr1

  $ hg merge

  merging f

  warning: internal :merge cannot merge symlinks for f

  warning: conflicts while merging f! (edit, then use 'hg resolve --mark')

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

  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

  [1]

  $ tellmeabout f

  f is a plain file with content:

  f

Test removed 'x' flag merged with content change - both ways

  $ hg up -Cqr0

  $ echo change > f

  $ hg ci -qm3

  $ hg merge -r1

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

  (branch merge, don't forget to commit)

  $ tellmeabout f

  f is a plain file with content:

  change

  $ hg up -qCr1

  $ hg merge -r3

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

  (branch merge, don't forget to commit)

  $ tellmeabout f

  f is a plain file with content:

  change

  $ cd ..

Test merge with no common ancestor:

a: just different

b: x vs -, different (cannot calculate x, cannot ask merge tool)

c: x vs -, same (cannot calculate x, merge tool is no good)

d: x vs l, different

e: x vs l, same

f: - vs l, different

g: - vs l, same

h: l vs l, different

(where same means the filelog entry is shared and there thus is an ancestor!)

  $ hg init test4

  $ cd test4

  $ echo 0 > 0

  $ hg ci -Aqm0

  $ echo 1 > a

  $ echo 1 > b

  $ chmod +x b

  $ echo x > c

  $ chmod +x c

  $ echo 1 > d

  $ chmod +x d

  $ printf x > e

  $ chmod +x e

  $ echo 1 > f

  $ printf x > g

  $ ln -s 1 h

  $ hg ci -qAm1

  $ hg up -qr0

  $ echo 2 > a

  $ echo 2 > b

  $ echo x > c

  $ ln -s 2 d

  $ ln -s x e

  $ ln -s 2 f

  $ ln -s x g

  $ ln -s 2 h

  $ hg ci -Aqm2

  $ hg merge

  merging a

  warning: cannot merge flags for b

  merging b

  warning: cannot merge flags for c

  merging d

  warning: internal :merge cannot merge symlinks for d

  warning: conflicts while merging d! (edit, then use 'hg resolve --mark')

  merging f

  warning: internal :merge cannot merge symlinks for f

  warning: conflicts while merging f! (edit, then use 'hg resolve --mark')

  merging h

  warning: internal :merge cannot merge symlinks for h

  warning: conflicts while merging h! (edit, then use 'hg resolve --mark')

  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')

  warning: conflicts while merging b! (edit, then use 'hg resolve --mark')

  3 files updated, 0 files merged, 0 files removed, 5 files unresolved

  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

  [1]

  $ hg resolve -l

  U a