--- a/hgext3rd/evolve/evolvecmd.py	Thu Mar 29 16:38:00 2018 +0530
+++ b/hgext3rd/evolve/evolvecmd.py	Thu Mar 29 16:43:28 2018 +0530
@@ -24,6 +24,7 @@
     node,
     obsolete,
     phases,
+    repair,
     scmutil,
     util,
 )
@@ -945,6 +946,9 @@
         if opts['stop']:
             raise error.Abort(_('cannot specify both "--stop" and'
                                 ' "--continue"'))
+        if opts['abort']:
+            raise error.Abort(_('cannot specify both "--abort" and'
+                                ' "--continue"'))
 
     if opts['stop']:
         if opts['any']:
@@ -953,6 +957,16 @@
             raise error.Abort(_('cannot specify both "--all" and "--stop"'))
         if opts['rev']:
             raise error.Abort(_('cannot specify both "--rev" and "--stop"'))
+        if opts['abort']:
+            raise error.Abort(_('cannot specify both "--abort" and "--stop"'))
+
+    if opts['abort']:
+        if opts['any']:
+            raise error.Abort(_('cannot specify both "--any" and "--abort"'))
+        if opts['all']:
+            raise error.Abort(_('cannot specify both "--all" and "--abort"'))
+        if opts['rev']:
+            raise error.Abort(_('cannot specify both "--rev" and "--abort"'))
 
     if opts['rev']:
         if opts['any']:
@@ -1036,6 +1050,7 @@
                            'current  working directory and its descendants')),
      ('c', 'continue', False, _('continue an interrupted evolution')),
      ('', 'stop', False, _('stop the interrupted evolution')),
+     ('', 'abort', False, _('abort the interrupted evolution')),
      ('l', 'list', False, _('provide details on troubled changesets'
                             ' in the repo')),
     ] + mergetoolopts,
@@ -1121,6 +1136,7 @@
     confirmopt = opts['confirm']
     revopt = opts['rev']
     stopopt = opts['stop']
+    abortopt = opts['abort']
 
     troublecategories = ['phase_divergent', 'content_divergent', 'orphan']
     specifiedcategories = [t.replace('_', '')
@@ -1196,6 +1212,11 @@
         ui.status(_('working directory is now at %s\n') % pctx)
         evolvestate.delete()
         return
+    elif abortopt:
+        if not evolvestate:
+            raise error.Abort(_('no interrupted evolve to stop'))
+        evolvestate.load()
+        return abortevolve(ui, repo, evolvestate)
     else:
         cmdutil.bailifchanged(repo)
 
@@ -1242,6 +1263,56 @@
     progresscb()
     _cleanup(ui, repo, startnode, showprogress)
 
+def abortevolve(ui, repo, evolvestate):
+    """ logic for handling of `hg evolve --abort`"""
+
+    with repo.wlock(), repo.lock():
+        evolvedctx = []
+        # boolean value to say whether we should strip or not
+        cleanup = True
+        startnode = evolvestate['startnode']
+        for old, new in evolvestate['replacements'].iteritems():
+            evolvedctx.append(repo[new[0]])
+        evolvedrevs = [c.rev() for c in evolvedctx]
+
+        # checking if phase changed of any of the evolved rev
+        immutable = [c for c in evolvedctx if not c.mutable()]
+        if immutable:
+            repo.ui.warn(_("cannot clean up public changesets: %s\n")
+                         % ', '.join(str(c) for c in immutable),
+                         hint=_("see 'hg help phases' for details"))
+            cleanup = False
+
+        # checking no new changesets are created on evolved revs
+        descendants = set()
+        if evolvedrevs:
+            descendants = set(repo.changelog.descendants(evolvedrevs))
+        if descendants - set(evolvedrevs):
+            repo.ui.warn(_("warning: new changesets detected on destination "
+                           "branch\n"))
+            cleanup = False
+
+        if cleanup:
+            if evolvedrevs:
+                strippoints = [
+                        c.node() for c in repo.set('roots(%ld)', evolvedrevs)]
+
+            # updating the working directory
+            hg.updaterepo(repo, startnode, True)
+
+            # Strip from the first evolved revision
+            if evolvedrevs:
+                # no backup of evolved cset versions needed
+                repair.strip(repo.ui, repo, strippoints, False)
+
+            evolvestate.delete()
+            ui.status(_('evolve aborted\n'))
+            ui.status(_('working directory is now at %s\n') %\
+                      node.hex(startnode)[:12])
+        else:
+            raise error.Abort(_("unable to abort interrupted evolve, use 'hg "
+                                "evolve --stop' to stop evolve"))
+
 def continueevolve(ui, repo, evolvestate, progresscb):
     """logic for handling of `hg evolve --continue`"""
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-evolve-abort.t	Thu Mar 29 16:43:28 2018 +0530
@@ -0,0 +1,499 @@
+Tests for the --abort flag for `hg evolve` command
+==================================================
+
+Setup
+=====
+
+  $ cat >> $HGRCPATH <<EOF
+  > [phases]
+  > publish = False
+  > [alias]
+  > glog = log -GT "{rev}:{node|short} {desc}\n ({bookmarks}) {phase}"
+  > [extensions]
+  > EOF
+  $ echo "evolve=$(echo $(dirname $TESTDIR))/hgext3rd/evolve/" >> $HGRCPATH
+
+  $ hg init abortrepo
+  $ cd abortrepo
+  $ echo ".*\.orig" > .hgignore
+  $ hg add .hgignore
+  $ hg ci -m "added hgignore"
+  $ for ch in a b c d; do echo foo > $ch; hg add $ch; hg ci -qm "added "$ch; done;
+
+  $ hg glog
+  @  4:c41c793e0ef1 added d
+  |   () draft
+  o  3:ca1b80f7960a added c
+  |   () draft
+  o  2:b1661037fa25 added b
+  |   () draft
+  o  1:c7586e2a9264 added a
+  |   () draft
+  o  0:8fa14d15e168 added hgignore
+      () draft
+
+Testing --abort when no evolve is interrupted
+=============================================
+
+  $ hg evolve --abort
+  abort: no interrupted evolve to stop
+  [255]
+
+Testing with wrong combination of flags
+=======================================
+
+  $ hg evolve --abort --continue
+  abort: cannot specify both "--abort" and "--continue"
+  [255]
+
+  $ hg evolve --abort --stop
+  abort: cannot specify both "--abort" and "--stop"
+  [255]
+
+  $ hg evolve --abort --rev 3
+  abort: cannot specify both "--rev" and "--abort"
+  [255]
+
+  $ hg evolve --abort --any
+  abort: cannot specify both "--any" and "--abort"
+  [255]
+
+  $ hg evolve --abort --all
+  abort: cannot specify both "--all" and "--abort"
+  [255]
+
+Normal testingw when no rev was evolved
+========================================
+
+  $ hg prev
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  [3] added c
+
+  $ echo babar > d
+  $ hg add d
+  $ hg amend
+  1 new orphan changesets
+
+  $ hg evolve --all
+  move:[4] added d
+  atop:[5] added c
+  merging d
+  warning: conflicts while merging d! (edit, then use 'hg resolve --mark')
+  evolve failed!
+  fix conflict and run 'hg evolve --continue' or use 'hg update -C .' to abort
+  abort: unresolved merge conflicts (see hg help resolve)
+  [255]
+
+  $ hg evolve --abort
+  evolve aborted
+  working directory is now at e93a9161a274
+
+  $ hg glog
+  @  5:e93a9161a274 added c
+  |   () draft
+  | *  4:c41c793e0ef1 added d
+  | |   () draft
+  | x  3:ca1b80f7960a added c
+  |/    () draft
+  o  2:b1661037fa25 added b
+  |   () draft
+  o  1:c7586e2a9264 added a
+  |   () draft
+  o  0:8fa14d15e168 added hgignore
+      () draft
+
+  $ hg diff
+
+  $ hg status
+
+cleaning up things for next testing
+
+  $ hg evolve --all
+  move:[4] added d
+  atop:[5] added c
+  merging d
+  warning: conflicts while merging d! (edit, then use 'hg resolve --mark')
+  evolve failed!
+  fix conflict and run 'hg evolve --continue' or use 'hg update -C .' to abort
+  abort: unresolved merge conflicts (see hg help resolve)
+  [255]
+  $ echo foo > d
+  $ hg resolve -m
+  (no more unresolved files)
+  continue: hg evolve --continue
+  $ hg evolve --continue
+  evolving 4:c41c793e0ef1 "added d"
+  working directory is now at e83de241f751
+
+  $ hg up .^^^
+  0 files updated, 0 files merged, 3 files removed, 0 files unresolved
+
+When there are evolved revisions but on a single branch
+=======================================================
+
+  $ echo bar > c
+  $ hg add c
+  $ hg amend
+  3 new orphan changesets
+
+  $ hg evolve --all
+  move:[2] added b
+  atop:[7] added a
+  move:[5] added c
+  atop:[8] added b
+  merging c
+  warning: conflicts while merging c! (edit, then use 'hg resolve --mark')
+  evolve failed!
+  fix conflict and run 'hg evolve --continue' or use 'hg update -C .' to abort
+  abort: unresolved merge conflicts (see hg help resolve)
+  [255]
+
+  $ hg glog
+  @  8:0c41ec482070 added b
+  |   () draft
+  o  7:125af0ed8cae added a
+  |   () draft
+  | *  6:e83de241f751 added d
+  | |   () draft
+  | *  5:e93a9161a274 added c
+  | |   () draft
+  | x  2:b1661037fa25 added b
+  | |   () draft
+  | x  1:c7586e2a9264 added a
+  |/    () draft
+  o  0:8fa14d15e168 added hgignore
+      () draft
+
+  $ hg evolve --abort
+  1 new orphan changesets
+  evolve aborted
+  working directory is now at 125af0ed8cae
+
+  $ hg glog
+  @  7:125af0ed8cae added a
+  |   () draft
+  | *  6:e83de241f751 added d
+  | |   () draft
+  | *  5:e93a9161a274 added c
+  | |   () draft
+  | *  2:b1661037fa25 added b
+  | |   () draft
+  | x  1:c7586e2a9264 added a
+  |/    () draft
+  o  0:8fa14d15e168 added hgignore
+      () draft
+
+  $ cd ..
+
+Testing when evolved revs are on multiple branches
+==================================================
+
+  $ hg init repotwo
+  $ cd repotwo
+  $ echo ".*\.orig" > .hgignore
+  $ hg add .hgignore
+  $ hg ci -m "added hgignore"
+  $ echo a > a
+  $ hg ci -Aqm "added a"
+  $ for ch in b c; do echo $ch > $ch; hg add $ch; hg ci -m "added "$ch; done;
+  $ hg up .^^
+  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
+  $ for ch in c d; do echo $ ch > $ch; hg add $ch; hg ci -m "added "$ch; done;
+  created new head
+  $ hg up .^^
+  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
+  $ echo foo > a
+  $ hg ci -m "foo to a"
+  created new head
+
+  $ hg glog
+  @  6:8f20d4390c21 foo to a
+  |   () draft
+  | o  5:bcb1c47f8520 added d
+  | |   () draft
+  | o  4:86d2603075a3 added c
+  |/    () draft
+  | o  3:17509928e5bf added c
+  | |   () draft
+  | o  2:9f0c80a55ddc added b
+  |/    () draft
+  o  1:2f913b0c9220 added a
+  |   () draft
+  o  0:8fa14d15e168 added hgignore
+      () draft
+
+  $ hg prev
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  [1] added a
+  $ echo aa > a
+  $ hg amend
+  5 new orphan changesets
+
+  $ hg evolve --all
+  move:[2] added b
+  atop:[7] added a
+  move:[4] added c
+  atop:[7] added a
+  move:[6] foo to a
+  atop:[7] added a
+  merging a
+  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
+  evolve failed!
+  fix conflict and run 'hg evolve --continue' or use 'hg update -C .' to abort
+  abort: unresolved merge conflicts (see hg help resolve)
+  [255]
+
+  $ hg glog
+  o  9:7f8e8bd9f0b6 added c
+  |   () draft
+  | o  8:db3b42ef4da7 added b
+  |/    () draft
+  @  7:807e8e2ca559 added a
+  |   () draft
+  | *  6:8f20d4390c21 foo to a
+  | |   () draft
+  | | *  5:bcb1c47f8520 added d
+  | | |   () draft
+  | | x  4:86d2603075a3 added c
+  | |/    () draft
+  | | *  3:17509928e5bf added c
+  | | |   () draft
+  | | x  2:9f0c80a55ddc added b
+  | |/    () draft
+  | x  1:2f913b0c9220 added a
+  |/    () draft
+  o  0:8fa14d15e168 added hgignore
+      () draft
+
+  $ hg evolve --abort
+  2 new orphan changesets
+  evolve aborted
+  working directory is now at 807e8e2ca559
+
+  $ hg glog
+  @  7:807e8e2ca559 added a
+  |   () draft
+  | *  6:8f20d4390c21 foo to a
+  | |   () draft
+  | | *  5:bcb1c47f8520 added d
+  | | |   () draft
+  | | *  4:86d2603075a3 added c
+  | |/    () draft
+  | | *  3:17509928e5bf added c
+  | | |   () draft
+  | | *  2:9f0c80a55ddc added b
+  | |/    () draft
+  | x  1:2f913b0c9220 added a
+  |/    () draft
+  o  0:8fa14d15e168 added hgignore
+      () draft
+
+  $ hg status
+
+  $ hg diff
+
+Testing when user created a new changesets on top of evolved revisions
+======================================================================
+
+  $ hg evolve --all
+  move:[2] added b
+  atop:[7] added a
+  move:[4] added c
+  atop:[7] added a
+  move:[6] foo to a
+  atop:[7] added a
+  merging a
+  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
+  evolve failed!
+  fix conflict and run 'hg evolve --continue' or use 'hg update -C .' to abort
+  abort: unresolved merge conflicts (see hg help resolve)
+  [255]
+  $ hg glog
+  o  9:7f8e8bd9f0b6 added c
+  |   () draft
+  | o  8:db3b42ef4da7 added b
+  |/    () draft
+  @  7:807e8e2ca559 added a
+  |   () draft
+  | *  6:8f20d4390c21 foo to a
+  | |   () draft
+  | | *  5:bcb1c47f8520 added d
+  | | |   () draft
+  | | x  4:86d2603075a3 added c
+  | |/    () draft
+  | | *  3:17509928e5bf added c
+  | | |   () draft
+  | | x  2:9f0c80a55ddc added b
+  | |/    () draft
+  | x  1:2f913b0c9220 added a
+  |/    () draft
+  o  0:8fa14d15e168 added hgignore
+      () draft
+
+  $ echo foo > a
+  $ hg resolve -m
+  (no more unresolved files)
+  continue: hg evolve --continue
+
+  $ cd ..
+  $ hg init clonerepo
+  $ cd repotwo
+  $ hg push ../clonerepo --force
+  pushing to ../clonerepo
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 10 changesets with 8 changes to 5 files (+4 heads)
+  3 new obsolescence markers
+  3 new orphan changesets
+  $ cd ../clonerepo
+  $ hg up 7f8e8bd9f0b6
+  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ echo bar > bar
+  $ hg add bar
+  $ hg ci -m "made an new commit on evolved rev"
+
+  $ hg push ../repotwo --force
+  pushing to ../repotwo
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files
+  $ cd ../repotwo
+  $ hg evolve --abort
+  warning: new changesets detected on destination branch
+  abort: unable to abort interrupted evolve, use 'hg evolve --stop' to stop evolve
+  [255]
+
+  $ hg evolve --stop
+  stopped the interrupted evolve
+  working directory is now at 807e8e2ca559
+
+Testing when the evolved revision turned public due to some other user actions
+==============================================================================
+
+  $ hg evolve --all
+  move:[3] added c
+  atop:[8] added b
+  move:[5] added d
+  atop:[9] added c
+  move:[6] foo to a
+  atop:[7] added a
+  merging a
+  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
+  evolve failed!
+  fix conflict and run 'hg evolve --continue' or use 'hg update -C .' to abort
+  abort: unresolved merge conflicts (see hg help resolve)
+  [255]
+
+  $ hg glog
+  o  12:1c476940790a added d
+  |   () draft
+  | o  11:c10a55eb0cc6 added c
+  | |   () draft
+  +---o  10:48eca1ed5478 made an new commit on evolved rev
+  | |     () draft
+  o |  9:7f8e8bd9f0b6 added c
+  | |   () draft
+  | o  8:db3b42ef4da7 added b
+  |/    () draft
+  @  7:807e8e2ca559 added a
+  |   () draft
+  | *  6:8f20d4390c21 foo to a
+  | |   () draft
+  | x  1:2f913b0c9220 added a
+  |/    () draft
+  o  0:8fa14d15e168 added hgignore
+      () draft
+
+  $ hg phase -r 1c476940790a --public
+
+  $ hg evolve --abort
+  cannot clean up public changesets: 1c476940790a
+  abort: unable to abort interrupted evolve, use 'hg evolve --stop' to stop evolve
+  [255]
+
+  $ hg evolve --stop
+  stopped the interrupted evolve
+  working directory is now at 807e8e2ca559
+
+  $ cd ..
+
+Testing that bookmark should be moved back when doing `hg evolve --abort`
+=========================================================================
+
+  $ hg init repothree
+  $ cd repothree
+  $ echo ".*\.orig" > .hgignore
+  $ hg add .hgignore
+  $ hg ci -m "added hgignore"
+  $ for ch in a b c; do echo $ch > $ch; hg add $ch; hg ci -m "added "$ch; done;
+
+  $ hg up .^
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ hg bookmark bm1
+  $ hg up .^
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  (leaving bookmark bm1)
+  $ echo foo > c
+  $ hg add c
+  $ hg amend
+  2 new orphan changesets
+
+  $ hg glog
+  @  4:a0086c17bfc7 added a
+  |   () draft
+  | *  3:17509928e5bf added c
+  | |   () draft
+  | *  2:9f0c80a55ddc added b
+  | |   (bm1) draft
+  | x  1:2f913b0c9220 added a
+  |/    () draft
+  o  0:8fa14d15e168 added hgignore
+      () draft
+
+  $ hg evolve --all
+  move:[2] added b
+  atop:[4] added a
+  move:[3] added c
+  atop:[5] added b
+  merging c
+  warning: conflicts while merging c! (edit, then use 'hg resolve --mark')
+  evolve failed!
+  fix conflict and run 'hg evolve --continue' or use 'hg update -C .' to abort
+  abort: unresolved merge conflicts (see hg help resolve)
+  [255]
+
+  $ hg glog
+  @  5:c1f4718020e3 added b
+  |   (bm1) draft
+  o  4:a0086c17bfc7 added a
+  |   () draft
+  | *  3:17509928e5bf added c
+  | |   () draft
+  | x  2:9f0c80a55ddc added b
+  | |   () draft
+  | x  1:2f913b0c9220 added a
+  |/    () draft
+  o  0:8fa14d15e168 added hgignore
+      () draft
+
+  $ hg evolve --abort
+  1 new orphan changesets
+  evolve aborted
+  working directory is now at a0086c17bfc7
+
+XXX: the bookmark bm1 should have moved back to 9f0c80a55ddc
+  $ hg glog
+  @  4:a0086c17bfc7 added a
+  |   (bm1) draft
+  | *  3:17509928e5bf added c
+  | |   () draft
+  | *  2:9f0c80a55ddc added b
+  | |   () draft
+  | x  1:2f913b0c9220 added a
+  |/    () draft
+  o  0:8fa14d15e168 added hgignore
+      () draft