$ addcommit () {

  >     echo $1 > $1

  >     hg add $1

  >     hg commit -d "${2} 0" -m $1

  > }

  $ commit () {

  >     hg commit -d "${2} 0" -m $1

  > }

  $ hg init a

  $ cd a

  $ addcommit "A" 0

  $ addcommit "B" 1

  $ echo "C" >> A

  $ commit "C" 2

  $ hg update -C 0

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

  $ echo "D" >> A

  $ commit "D" 3

  created new head

State before the merge

  $ hg status

  $ hg id

  e45016d2b3d3 tip

  $ hg summary

  parent: 3:e45016d2b3d3 tip

   D

  branch: default

  commit: (clean)

  update: 2 new changesets, 2 branch heads (merge)

  phases: 4 draft

Testing the abort functionality first in case of conflicts

  $ hg merge --abort

  abort: no merge in progress

  [255]

  $ hg merge

  merging A

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

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

  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon

  [1]

  $ hg merge --abort e4501

  abort: cannot specify a node with --abort

  [255]

  $ hg merge --abort --rev e4501

  abort: cannot specify both --rev and --abort

  [255]

  $ hg merge --abort

  aborting the merge, updating back to e45016d2b3d3

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

Checking that we got back in the same state

  $ hg status

  ? A.orig

  $ hg id

  e45016d2b3d3 tip

  $ hg summary

  parent: 3:e45016d2b3d3 tip

   D

  branch: default

  commit: 1 unknown (clean)

  update: 2 new changesets, 2 branch heads (merge)

  phases: 4 draft

Merging a conflict araises

  $ hg merge

  merging A

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

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

  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon

  [1]

Correct the conflict without marking the file as resolved

  $ echo "ABCD" > A

  $ hg commit -m "Merged"

  abort: unresolved merge conflicts (see 'hg help resolve')

  [255]

Mark the conflict as resolved and commit

  $ hg resolve -m A

  (no more unresolved files)

  $ hg commit -m "Merged"

Test that if a file is removed but not marked resolved, the commit still fails

(issue4972)

  $ hg up ".^"

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

  $ hg merge 2

  merging A

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

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

  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon

  [1]

  $ hg rm --force A

  $ hg commit -m merged

  abort: unresolved merge conflicts (see 'hg help resolve')

  [255]

  $ hg resolve -ma

  (no more unresolved files)

  $ hg commit -m merged

  created new head

Testing the abort functionality in case of no conflicts

  $ hg update -C 0

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

  $ addcommit "E" 4

  created new head

  $ hg id

  68352a18a7c4 tip

  $ hg merge -r 4

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

  (branch merge, don't forget to commit)

  $ hg merge --preview --abort

  abort: cannot specify --preview with --abort

  [255]

  $ hg merge --abort

  aborting the merge, updating back to 68352a18a7c4

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

  $ hg id

  68352a18a7c4 tip

  $ cd ..