--- a/mercurial/cmdutil.py	Fri Nov 15 15:58:56 2019 -0500
+++ b/mercurial/cmdutil.py	Thu Nov 21 09:25:50 2019 +0100
@@ -1771,6 +1771,8 @@
             overrides = {}
             if partial:
                 overrides[(b'ui', b'allowemptycommit')] = True
+            if opts.get(b'secret'):
+                overrides[(b'phases', b'new-commit')] = b'secret'
             with repo.ui.configoverride(overrides, b'import'):
                 n = repo.commit(
                     message, user, date, match=m, editor=editor, extra=extra

--- a/mercurial/commands.py	Fri Nov 15 15:58:56 2019 -0500
+++ b/mercurial/commands.py	Thu Nov 21 09:25:50 2019 +0100
@@ -4033,6 +4033,7 @@
             _(b'NUM'),
         ),
         (b'b', b'base', b'', _(b'base path (DEPRECATED)'), _(b'PATH')),
+        (b'', b'secret', None, _(b'use the secret phase for committing')),
         (b'e', b'edit', False, _(b'invoke editor on commit messages')),
         (
             b'f',
@@ -4181,6 +4182,8 @@
     update = not opts.get(b'bypass')
     if not update and opts.get(b'no_commit'):
         raise error.Abort(_(b'cannot use --no-commit with --bypass'))
+    if opts.get(b'secret') and opts.get(b'no_commit'):
+        raise error.Abort(_(b'cannot use --no-commit with --secret'))
     try:
         sim = float(opts.get(b'similarity') or 0)
     except ValueError:

--- a/tests/test-completion.t	Fri Nov 15 15:58:56 2019 -0500
+++ b/tests/test-completion.t	Thu Nov 21 09:25:50 2019 +0100
@@ -328,7 +328,7 @@
   heads: rev, topo, active, closed, style, template
   help: extension, command, keyword, system
   identify: rev, num, id, branch, tags, bookmarks, ssh, remotecmd, insecure, template
-  import: strip, base, edit, force, no-commit, bypass, partial, exact, prefix, import-branch, message, logfile, date, user, similarity
+  import: strip, base, secret, edit, force, no-commit, bypass, partial, exact, prefix, import-branch, message, logfile, date, user, similarity
   incoming: force, newest-first, bundle, rev, bookmarks, branch, patch, git, limit, no-merges, stat, graph, style, template, ssh, remotecmd, insecure, subrepos
   init: ssh, remotecmd, insecure
   locate: rev, print0, fullpath, include, exclude

--- a/tests/test-import.t	Fri Nov 15 15:58:56 2019 -0500
+++ b/tests/test-import.t	Thu Nov 21 09:25:50 2019 +0100
@@ -435,6 +435,49 @@
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     second change
   
+  $ hg --cwd b phase tip
+  1: draft
+  $ rm -r b
+
+
+hg import --secret
+
+  $ hg clone -r0 a b -q
+  $ hg --cwd b import --no-commit --secret ../exported-tip.patch
+  abort: cannot use --no-commit with --secret
+  [255]
+  $ hg --cwd b import --secret ../exported-tip.patch
+  applying ../exported-tip.patch
+  $ hg --cwd b diff -c . --nodates
+  diff -r 80971e65b431 -r 1d4bd90af0e4 a
+  --- a/a
+  +++ b/a
+  @@ -1,1 +1,2 @@
+   line 1
+  +line 2
+  $ hg --cwd b phase
+  1: secret
+  $ hg --cwd b --config extensions.strip= strip 1 --no-backup --quiet
+  $ HGEDITOR=cat hg --cwd b import --secret --edit ../exported-tip.patch
+  applying ../exported-tip.patch
+  second change
+  
+  
+  HG: Enter commit message.  Lines beginning with 'HG:' are removed.
+  HG: Leave message empty to abort commit.
+  HG: --
+  HG: user: someone
+  HG: branch 'default'
+  HG: changed a
+  $ hg --cwd b diff -c . --nodates
+  diff -r 80971e65b431 -r 1d4bd90af0e4 a
+  --- a/a
+  +++ b/a
+  @@ -1,1 +1,2 @@
+   line 1
+  +line 2
+  $ hg --cwd b phase
+  1: secret
   $ rm -r b