annotate tests/test-import.t @ 44909:d452acc8cce8 stable

flags: account for flag change when tracking rename relevant to merge

There are some logic filtering rename to the one relevant to the merge. That
logic was oblivious of flag change, leading to exec flag being dropped when
merged with a renamed.

There are two others bugs affecting this scenario. This patch fix the was where
there is not modification involved except for the flag change. Fixes for the
other bug are coming in later changesets.

Differential Revision: https://phab.mercurial-scm.org/D8531

  $ hg init a
  $ mkdir a/d1
  $ mkdir a/d1/d2
  $ echo line 1 > a/a
  $ echo line 1 > a/d1/d2/a
  $ hg --cwd a ci -Ama
  adding a
  adding d1/d2/a

  $ echo line 2 >> a/a
  $ hg --cwd a ci -u someone -d '1 0' -m'second change'

import with no args:

  $ hg --cwd a import
  abort: need at least one patch to import
  [255]

generate patches for the test

  $ hg --cwd a export tip > exported-tip.patch
  $ hg --cwd a diff -r0:1 > diffed-tip.patch


import exported patch
(this also tests that editor is not invoked, if the patch contains the
commit message and '--edit' is not specified)

  $ hg clone -r0 a b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ HGEDITOR=cat hg --cwd b import --debug ../exported-tip.patch
  applying ../exported-tip.patch
  Subject: 
  
  Content-Type: text/plain
  found patch at byte 202
  patch generated by hg export
  From: someone
  Date: 1 0
  Node ID: 1d4bd90af0e43687763d158dfa83ff2a4b6c0c32
  message:
  second change
  patching file a
  committing files:
  a
  committing manifest
  committing changelog
  created 1d4bd90af0e4
  updating the branch cache

message and committer and date should be same

  $ hg --cwd b tip
  changeset:   1:1d4bd90af0e4
  tag:         tip
  user:        someone
  date:        Thu Jan 01 00:00:01 1970 +0000
  summary:     second change
  
  $ rm -r b


import exported patch with external patcher
(this also tests that editor is invoked, if the '--edit' is specified,
regardless of the commit message in the patch)

  $ cat > dummypatch.py <<EOF
  > from __future__ import print_function
  > print('patching file a')
  > open('a', 'wb').write(b'line2\n')
  > EOF
  $ hg clone -r0 a b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ HGEDITOR=cat hg --config ui.patch="\"$PYTHON\" ../dummypatch.py" --cwd b import --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
  $ cat b/a
  line2
  $ rm -r b


import of plain diff should fail without message
(this also tests that editor is invoked, if the patch doesn't contain
the commit message, regardless of '--edit')

  $ hg clone -r0 a b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat > $TESTTMP/editor.sh <<EOF
  > env | grep HGEDITFORM
  > cat \$1
  > EOF
  $ HGEDITOR="sh $TESTTMP/editor.sh" hg --cwd b import ../diffed-tip.patch
  applying ../diffed-tip.patch
  HGEDITFORM=import.normal.normal
  
  
  HG: Enter commit message.  Lines beginning with 'HG:' are removed.
  HG: Leave message empty to abort commit.
  HG: --
  HG: user: test
  HG: branch 'default'
  HG: changed a
  abort: empty commit message
  [255]

Test avoiding editor invocation at applying the patch with --exact,
even if commit message is empty

  $ echo a >> b/a
  $ hg --cwd b commit -m ' '
  $ hg --cwd b tip -T "{node}\n"
  d8804f3f5396d800812f579c8452796a5993bdb2
  $ hg --cwd b export -o ../empty-log.diff .
  $ hg --cwd b update -q -C ".^1"
  $ hg --cwd b --config extensions.strip= strip -q tip
  $ HGEDITOR=cat hg --cwd b import --exact ../empty-log.diff
  applying ../empty-log.diff
  $ hg --cwd b tip -T "{node}\n"
  d8804f3f5396d800812f579c8452796a5993bdb2

  $ rm -r b


import of plain diff should be ok with message

  $ hg clone -r0 a b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg --cwd b import -mpatch ../diffed-tip.patch
  applying ../diffed-tip.patch
  $ rm -r b


import of plain diff with specific date and user
(this also tests that editor is not invoked, if
'--message'/'--logfile' is specified and '--edit' is not)

  $ hg clone -r0 a b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg --cwd b import -mpatch -d '1 0' -u '[e-mail]' ../diffed-tip.patch
  applying ../diffed-tip.patch
  $ hg -R b tip -pv
  changeset:   1:ca68f19f3a40
  tag:         tip
  user:        [e-mail]
  date:        Thu Jan 01 00:00:01 1970 +0000
  files:       a
  description:
  patch
  
  
  diff -r 80971e65b431 -r ca68f19f3a40 a
  --- a/a	Thu Jan 01 00:00:00 1970 +0000
  +++ b/a	Thu Jan 01 00:00:01 1970 +0000
  @@ -1,1 +1,2 @@
   line 1
  +line 2
  
  $ rm -r b


import of plain diff should be ok with --no-commit
(this also tests that editor is not invoked, if '--no-commit' is
specified, regardless of '--edit')

  $ hg clone -r0 a b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ HGEDITOR=cat hg --cwd b import --no-commit --edit ../diffed-tip.patch
  applying ../diffed-tip.patch
  $ hg --cwd b diff --nodates
  diff -r 80971e65b431 a
  --- a/a
  +++ b/a
  @@ -1,1 +1,2 @@
   line 1
  +line 2
  $ rm -r b


import of malformed plain diff should fail

  $ hg clone -r0 a b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ sed 's/1,1/foo/' < diffed-tip.patch > broken.patch
  $ hg --cwd b import -mpatch ../broken.patch
  applying ../broken.patch
  abort: bad hunk #1
  [255]
  $ rm -r b

hg -R repo import
put the clone in a subdir - having a directory named "a"
used to hide a bug.

  $ mkdir dir
  $ hg clone -r0 a dir/b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd dir
  $ hg -R b import ../exported-tip.patch
  applying ../exported-tip.patch
  $ cd ..
  $ rm -r dir


import from stdin

  $ hg clone -r0 a b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg --cwd b import - < exported-tip.patch
  applying patch from stdin
  $ rm -r b


import two patches in one stream

  $ hg init b
  $ hg --cwd a export 0:tip | hg --cwd b import -
  applying patch from stdin
  $ hg --cwd a id
  1d4bd90af0e4 tip
  $ hg --cwd b id
  1d4bd90af0e4 tip
  $ rm -r b


override commit message

  $ hg clone -r0 a b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg --cwd b import -m 'override' - < exported-tip.patch
  applying patch from stdin
  $ hg --cwd b tip | grep override
  summary:     override
  $ rm -r b

  $ cat > mkmsg.py <<EOF
  > import email.message
  > import sys
  > msg = email.message.Message()
  > patch = open(sys.argv[1], 'rb').read()
  > msg.set_payload(b'email commit message\n' + patch)
  > msg['Subject'] = 'email patch'
  > msg['From'] = 'email patcher'
  > open(sys.argv[2], 'wb').write(bytes(msg))
  > EOF


plain diff in email, subject, message body

  $ hg clone -r0 a b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ "$PYTHON" mkmsg.py diffed-tip.patch msg.patch
  $ hg --cwd b import ../msg.patch
  applying ../msg.patch
  $ hg --cwd b tip | grep email
  user:        email patcher
  summary:     email patch
  $ rm -r b


plain diff in email, no subject, message body

  $ hg clone -r0 a b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ grep -v '^Subject:' msg.patch | hg --cwd b import -
  applying patch from stdin
  $ rm -r b


plain diff in email, subject, no message body

  $ hg clone -r0 a b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ grep -v '^email ' msg.patch | hg --cwd b import -
  applying patch from stdin
  $ rm -r b


plain diff in email, no subject, no message body, should fail

  $ hg clone -r0 a b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ egrep -v '^(Subject|email)' msg.patch | hg --cwd b import -
  applying patch from stdin
  abort: empty commit message
  [255]
  $ rm -r b


hg export in email, should use patch header

  $ hg clone -r0 a b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ "$PYTHON" mkmsg.py exported-tip.patch msg.patch
  $ cat msg.patch | hg --cwd b import -
  applying patch from stdin
  $ hg --cwd b tip | grep second
  summary:     second change
  $ rm -r b

hg email --plain, should read X-Mercurial-Node header

  $ cat >> a/.hg/hgrc << EOF
  > [extensions]
  > patchbomb =
  > [email]
  > from = foo
  > cc = foo
  > to = bar
  > EOF
  $ hg --cwd a email -m ../tip-plain.mbox --plain --date '1970-1-1 0:1' tip
  this patch series consists of 1 patches.
  
  
  sending [PATCH] second change ...

  $ hg clone -r0 a b -q
  $ hg --cwd b import --debug ../tip-plain.mbox
  applying ../tip-plain.mbox
  Node ID: 1d4bd90af0e43687763d158dfa83ff2a4b6c0c32
  Subject: second change
  From: foo
  Content-Type: text/plain
  found patch at byte 0
  message:
  second change
  patching file a
  committing files:
  a
  committing manifest
  committing changelog
  created de620f6fe949
  updating the branch cache
  $ hg --cwd b tip
  changeset:   1:de620f6fe949
  tag:         tip
  user:        foo
  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
  $ hg --cwd b --config extensions.strip= strip 1 --no-backup --quiet
  $ hg --cwd b import --bypass --secret ../exported-tip.patch
  applying ../exported-tip.patch
  $ hg --cwd b phase -r tip
  1: secret
  $ hg --cwd b --config extensions.strip= strip 1 --no-backup --quiet
  $ rm -r b


subject: duplicate detection, removal of [PATCH]
The '---' tests the gitsendmail handling without proper mail headers

  $ cat > mkmsg2.py <<EOF
  > import email.message
  > import sys
  > msg = email.message.Message()
  > patch = open(sys.argv[1], 'rb').read()
  > msg.set_payload(b'email patch\n\nnext line\n---\n' + patch)
  > msg['Subject'] = '[PATCH] email patch'
  > msg['From'] = 'email patcher'
  > open(sys.argv[2], 'wb').write(bytes(msg))
  > EOF


plain diff in email, [PATCH] subject, message body with subject

  $ hg clone -r0 a b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ "$PYTHON" mkmsg2.py diffed-tip.patch msg.patch
  $ cat msg.patch | hg --cwd b import -
  applying patch from stdin
  $ hg --cwd b tip --template '{desc}\n'
  email patch
  
  next line
  $ rm -r b


Issue963: Parent of working dir incorrect after import of multiple
patches and rollback

We weren't backing up the correct dirstate file when importing many
patches: import patch1 patch2; rollback

  $ echo line 3 >> a/a
  $ hg --cwd a ci -m'third change'
  $ hg --cwd a export -o '../patch%R' 1 2
  $ hg clone -qr0 a b
  $ hg --cwd b parents --template 'parent: {rev}\n'
  parent: 0
  $ hg --cwd b import -v ../patch1 ../patch2
  applying ../patch1
  patching file a
  committing files:
  a
  committing manifest
  committing changelog
  created 1d4bd90af0e4
  applying ../patch2
  patching file a
  committing files:
  a
  committing manifest
  committing changelog
  created 6d019af21222
  $ hg --cwd b rollback
  repository tip rolled back to revision 0 (undo import)
  working directory now based on revision 0
  $ hg --cwd b parents --template 'parent: {rev}\n'
  parent: 0

Test that "hg rollback" doesn't restore dirstate to one at the
beginning of the rolled back transaction in not-"parent-gone" case.

invoking pretxncommit hook will cause marking '.hg/dirstate' as a file
to be restored when rolling back, after DirstateTransactionPlan (see wiki
page for detail).

  $ hg --cwd b branch -q foobar
  $ hg --cwd b commit -m foobar
  $ hg --cwd b update 0 -q
  $ hg --cwd b import ../patch1 ../patch2 --config hooks.pretxncommit=true
  applying ../patch1
  applying ../patch2
  $ hg --cwd b update -q 1
  $ hg --cwd b rollback -q
  $ hg --cwd b parents --template 'parent: {rev}\n'
  parent: 1

  $ hg --cwd b update -q -C 0
  $ hg --cwd b --config extensions.strip= strip -q 1

Test visibility of in-memory dirstate changes inside transaction to
external process

  $ echo foo > a/foo
  $ hg --cwd a commit -A -m 'adding foo' foo
  $ hg --cwd a export -o '../patch%R' 3

  $ cat > $TESTTMP/checkvisibility.sh <<EOF
  > echo "===="
  > hg parents --template "VISIBLE {rev}:{node|short}\n"
  > hg status -amr
  > # test that pending changes are hidden
  > unset HG_PENDING
  > hg parents --template "ACTUAL  {rev}:{node|short}\n"
  > hg status -amr
  > echo "===="
  > EOF

== test visibility to external editor

  $ (cd b && sh "$TESTTMP/checkvisibility.sh")
  ====
  VISIBLE 0:80971e65b431
  ACTUAL  0:80971e65b431
  ====

  $ HGEDITOR="sh $TESTTMP/checkvisibility.sh" hg --cwd b import -v --edit ../patch1 ../patch2 ../patch3
  applying ../patch1
  patching file a
  ====
  VISIBLE 0:80971e65b431
  M a
  ACTUAL  0:80971e65b431
  M a
  ====
  committing files:
  a
  committing manifest
  committing changelog
  created 1d4bd90af0e4
  applying ../patch2
  patching file a
  ====
  VISIBLE 1:1d4bd90af0e4
  M a
  ACTUAL  0:80971e65b431
  M a
  ====
  committing files:
  a
  committing manifest
  committing changelog
  created 6d019af21222
  applying ../patch3
  patching file foo
  adding foo
  ====
  VISIBLE 2:6d019af21222
  A foo
  ACTUAL  0:80971e65b431
  M a
  ====
  committing files:
  foo
  committing manifest
  committing changelog
  created 55e3f75b2378

  $ hg --cwd b rollback -q

(content of file "a" is already changed and it should be recognized as
"M", even though dirstate is restored to one before "hg import")

  $ (cd b && sh "$TESTTMP/checkvisibility.sh")
  ====
  VISIBLE 0:80971e65b431
  M a
  ACTUAL  0:80971e65b431
  M a
  ====
  $ hg --cwd b revert --no-backup a
  $ rm -f b/foo

== test visibility to precommit external hook

  $ cat >> b/.hg/hgrc <<EOF
  > [hooks]
  > precommit.visibility = sh $TESTTMP/checkvisibility.sh
  > EOF

  $ (cd b && sh "$TESTTMP/checkvisibility.sh")
  ====
  VISIBLE 0:80971e65b431
  ACTUAL  0:80971e65b431
  ====

  $ hg --cwd b import ../patch1 ../patch2 ../patch3
  applying ../patch1
  ====
  VISIBLE 0:80971e65b431
  M a
  ACTUAL  0:80971e65b431
  M a
  ====
  applying ../patch2
  ====
  VISIBLE 1:1d4bd90af0e4
  M a
  ACTUAL  0:80971e65b431
  M a
  ====
  applying ../patch3
  ====
  VISIBLE 2:6d019af21222
  A foo
  ACTUAL  0:80971e65b431
  M a
  ====

  $ hg --cwd b rollback -q
  $ (cd b && sh "$TESTTMP/checkvisibility.sh")
  ====
  VISIBLE 0:80971e65b431
  M a
  ACTUAL  0:80971e65b431
  M a
  ====
  $ hg --cwd b revert --no-backup a
  $ rm -f b/foo

  $ cat >> b/.hg/hgrc <<EOF
  > [hooks]
  > precommit.visibility =
  > EOF

== test visibility to pretxncommit external hook

  $ cat >> b/.hg/hgrc <<EOF
  > [hooks]
  > pretxncommit.visibility = sh $TESTTMP/checkvisibility.sh
  > EOF

  $ (cd b && sh "$TESTTMP/checkvisibility.sh")
  ====
  VISIBLE 0:80971e65b431
  ACTUAL  0:80971e65b431
  ====

  $ hg --cwd b import ../patch1 ../patch2 ../patch3
  applying ../patch1
  ====
  VISIBLE 0:80971e65b431
  M a
  ACTUAL  0:80971e65b431
  M a
  ====
  applying ../patch2
  ====
  VISIBLE 1:1d4bd90af0e4
  M a
  ACTUAL  0:80971e65b431
  M a
  ====
  applying ../patch3
  ====
  VISIBLE 2:6d019af21222
  A foo
  ACTUAL  0:80971e65b431
  M a
  ====

  $ hg --cwd b rollback -q
  $ (cd b && sh "$TESTTMP/checkvisibility.sh")
  ====
  VISIBLE 0:80971e65b431
  M a
  ACTUAL  0:80971e65b431
  M a
  ====
  $ hg --cwd b revert --no-backup a
  $ rm -f b/foo

  $ cat >> b/.hg/hgrc <<EOF
  > [hooks]
  > pretxncommit.visibility =
  > EOF

  $ rm -r b


importing a patch in a subdirectory failed at the commit stage

  $ echo line 2 >> a/d1/d2/a
  $ hg --cwd a ci -u someoneelse -d '1 0' -m'subdir change'

hg import in a subdirectory

  $ hg clone -r0 a b
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 2 changes to 2 files
  new changesets 80971e65b431
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg --cwd a export tip > tmp
  $ sed -e 's/d1\/d2\///' < tmp > subdir-tip.patch
  $ dir=`pwd`
  $ cd b/d1/d2 2>&1 > /dev/null
  $ hg import  ../../../subdir-tip.patch
  applying ../../../subdir-tip.patch
  $ cd "$dir"

message should be 'subdir change'
committer should be 'someoneelse'

  $ hg --cwd b tip
  changeset:   1:3577f5aea227
  tag:         tip
  user:        someoneelse
  date:        Thu Jan 01 00:00:01 1970 +0000
  summary:     subdir change
  

should be empty

  $ hg --cwd b status


Test fuzziness (ambiguous patch location, fuzz=2)

  $ hg init fuzzy
  $ cd fuzzy
  $ echo line1 > a
  $ echo line0 >> a
  $ echo line3 >> a
  $ hg ci -Am adda
  adding a
  $ echo line1 > a
  $ echo line2 >> a
  $ echo line0 >> a
  $ echo line3 >> a
  $ hg ci -m change a
  $ hg export tip > fuzzy-tip.patch
  $ hg up -C 0
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo line1 > a
  $ echo line0 >> a
  $ echo line1 >> a
  $ echo line0 >> a
  $ hg ci -m brancha
  created new head
  $ hg import --config patch.fuzz=0 -v fuzzy-tip.patch
  applying fuzzy-tip.patch
  patching file a
  Hunk #1 FAILED at 0
  1 out of 1 hunks FAILED -- saving rejects to file a.rej
  abort: patch failed to apply
  [255]
  $ hg import --no-commit -v fuzzy-tip.patch
  applying fuzzy-tip.patch
  patching file a
  Hunk #1 succeeded at 2 with fuzz 1 (offset 0 lines).
  applied to working directory
  $ hg revert -a
  reverting a

Test --exact failure

  $ sed 's/^# Parent .*/# Parent '"`hg log -r. -T '{node}'`"'/' \
  > < fuzzy-tip.patch > fuzzy-reparent.patch
  $ hg import --config patch.fuzz=0 --exact fuzzy-reparent.patch
  applying fuzzy-reparent.patch
  patching file a
  Hunk #1 FAILED at 0
  1 out of 1 hunks FAILED -- saving rejects to file a.rej
  abort: patch failed to apply
  [255]
  $ hg up -qC
  $ hg import --config patch.fuzz=2 --exact fuzzy-reparent.patch
  applying fuzzy-reparent.patch
  patching file a
  Hunk #1 succeeded at 2 with fuzz 1 (offset 0 lines).
  transaction abort!
  rollback completed
  abort: patch is damaged or loses information
  [255]
  $ hg up -qC

  $ grep '^#' fuzzy-tip.patch > empty.patch
  $ cat <<'EOF' >> empty.patch
  > change
  > 
  > diff -r bb90ef1daa38 -r 0e9b883378d4 a
  > --- a/a	Thu Jan 01 00:00:00 1970 +0000
  > --- b/a	Thu Jan 01 00:00:00 1970 +0000
  > EOF
  $ hg import --exact empty.patch
  applying empty.patch
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  abort: patch is damaged or loses information
  [255]
  $ hg up -qC

import with --no-commit should have written .hg/last-message.txt

  $ cat .hg/last-message.txt
  change (no-eol)


test fuzziness with eol=auto

  $ hg --config patch.eol=auto import --no-commit -v fuzzy-tip.patch
  applying fuzzy-tip.patch
  patching file a
  Hunk #1 succeeded at 2 with fuzz 1 (offset 0 lines).
  applied to working directory
  $ cd ..


Test hunk touching empty files (issue906)

  $ hg init empty
  $ cd empty
  $ touch a
  $ touch b1
  $ touch c1
  $ echo d > d
  $ hg ci -Am init
  adding a
  adding b1
  adding c1
  adding d
  $ echo a > a
  $ echo b > b1
  $ hg mv b1 b2
  $ echo c > c1
  $ hg copy c1 c2
  $ rm d
  $ touch d
  $ hg diff --git
  diff --git a/a b/a
  --- a/a
  +++ b/a
  @@ -0,0 +1,1 @@
  +a
  diff --git a/b1 b/b2
  rename from b1
  rename to b2
  --- a/b1
  +++ b/b2
  @@ -0,0 +1,1 @@
  +b
  diff --git a/c1 b/c1
  --- a/c1
  +++ b/c1
  @@ -0,0 +1,1 @@
  +c
  diff --git a/c1 b/c2
  copy from c1
  copy to c2
  --- a/c1
  +++ b/c2
  @@ -0,0 +1,1 @@
  +c
  diff --git a/d b/d
  --- a/d
  +++ b/d
  @@ -1,1 +0,0 @@
  -d
  $ hg ci -m empty
  $ hg export --git tip > empty.diff
  $ hg up -C 0
  4 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ hg import empty.diff
  applying empty.diff
  $ for name in a b1 b2 c1 c2 d; do
  >   echo % $name file
  >   test -f $name && cat $name
  >   done
  % a file
  a
  % b1 file
  % b2 file
  b
  % c1 file
  c
  % c2 file
  c
  % d file
  $ cd ..


Test importing a patch ending with a binary file removal

  $ hg init binaryremoval
  $ cd binaryremoval
  $ echo a > a
  $ "$PYTHON" -c "open('b', 'wb').write(b'a\x00b')"
  $ hg ci -Am addall
  adding a
  adding b
  $ hg rm a
  $ hg rm b
  $ hg st
  R a
  R b
  $ hg ci -m remove
  $ hg export --git . > remove.diff
  $ cat remove.diff | grep git
  diff --git a/a b/a
  diff --git a/b b/b
  $ hg up -C 0
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg import remove.diff
  applying remove.diff
  $ hg manifest
  $ cd ..


Issue927: test update+rename with common name

  $ hg init t
  $ cd t
  $ touch a
  $ hg ci -Am t
  adding a
  $ echo a > a

Here, bfile.startswith(afile)

  $ hg copy a a2
  $ hg ci -m copya
  $ hg export --git tip > copy.diff
  $ hg up -C 0
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg import copy.diff
  applying copy.diff

a should contain an 'a'

  $ cat a
  a

and a2 should have duplicated it

  $ cat a2
  a
  $ cd ..


test -p0

  $ hg init p0
  $ cd p0
  $ echo a > a
  $ hg ci -Am t
  adding a
  $ hg import -p foo
  abort: invalid value 'foo' for option -p, expected int
  [255]
  $ hg import -p0 - << EOF
  > foobar
  > --- a	Sat Apr 12 22:43:58 2008 -0400
  > +++ a	Sat Apr 12 22:44:05 2008 -0400
  > @@ -1,1 +1,1 @@
  > -a
  > +bb
  > EOF
  applying patch from stdin
  $ hg status
  $ cat a
  bb

test --prefix

  $ mkdir -p dir/dir2
  $ echo b > dir/dir2/b
  $ hg ci -Am b
  adding dir/dir2/b
  $ hg import -p2 --prefix dir - << EOF
  > foobar
  > --- drop1/drop2/dir2/b
  > +++ drop1/drop2/dir2/b
  > @@ -1,1 +1,1 @@
  > -b
  > +cc
  > EOF
  applying patch from stdin
  $ hg status
  $ cat dir/dir2/b
  cc
  $ cd ..


test paths outside repo root

  $ mkdir outside
  $ touch outside/foo
  $ hg init inside
  $ cd inside
  $ hg import - <<EOF
  > diff --git a/a b/b
  > rename from ../outside/foo
  > rename to bar
  > EOF
  applying patch from stdin
  abort: path contains illegal component: ../outside/foo
  [255]
  $ cd ..


test import with similarity and git and strip (issue295 et al.)

  $ hg init sim
  $ cd sim
  $ echo 'this is a test' > a
  $ hg ci -Ama
  adding a
  $ cat > ../rename.diff <<EOF
  > diff --git a/foo/a b/foo/a
  > deleted file mode 100644
  > --- a/foo/a
  > +++ /dev/null
  > @@ -1,1 +0,0 @@
  > -this is a test
  > diff --git a/foo/b b/foo/b
  > new file mode 100644
  > --- /dev/null
  > +++ b/foo/b
  > @@ -0,0 +1,2 @@
  > +this is a test
  > +foo
  > EOF
  $ hg import --no-commit -v -s 1 ../rename.diff -p2
  applying ../rename.diff
  patching file a
  patching file b
  adding b
  recording removal of a as rename to b (88% similar)
  applied to working directory
  $ echo 'mod b' > b
  $ hg st -C
  A b
    a
  R a
  $ hg revert -a
  forgetting b
  undeleting a
  $ cat b
  mod b
  $ rm b
  $ hg import --no-commit -v -s 100 ../rename.diff -p2
  applying ../rename.diff
  patching file a
  patching file b
  adding b
  applied to working directory
  $ hg st -C
  A b
  R a
  $ cd ..


Issue1495: add empty file from the end of patch

  $ hg init addemptyend
  $ cd addemptyend
  $ touch a
  $ hg addremove
  adding a
  $ hg ci -m "commit"
  $ cat > a.patch <<EOF
  > add a, b
  > diff --git a/a b/a
  > --- a/a
  > +++ b/a
  > @@ -0,0 +1,1 @@
  > +a
  > diff --git a/b b/b
  > new file mode 100644
  > EOF
  $ hg import --no-commit a.patch
  applying a.patch

apply a good patch followed by an empty patch (mainly to ensure
that dirstate is *not* updated when import crashes)
  $ hg update -q -C .
  $ rm b
  $ touch empty.patch
  $ hg import a.patch empty.patch
  applying a.patch
  applying empty.patch
  transaction abort!
  rollback completed
  abort: empty.patch: no diffs found
  [255]
  $ hg tip --template '{rev}  {desc|firstline}\n'
  0  commit
  $ hg -q status
  M a
  $ cd ..

create file when source is not /dev/null

  $ cat > create.patch <<EOF
  > diff -Naur proj-orig/foo proj-new/foo
  > --- proj-orig/foo       1969-12-31 16:00:00.000000000 -0800
  > +++ proj-new/foo        2009-07-17 16:50:45.801368000 -0700
  > @@ -0,0 +1,1 @@
  > +a
  > EOF

some people have patches like the following too

  $ cat > create2.patch <<EOF
  > diff -Naur proj-orig/foo proj-new/foo
  > --- proj-orig/foo.orig  1969-12-31 16:00:00.000000000 -0800
  > +++ proj-new/foo        2009-07-17 16:50:45.801368000 -0700
  > @@ -0,0 +1,1 @@
  > +a
  > EOF
  $ hg init oddcreate
  $ cd oddcreate
  $ hg import --no-commit ../create.patch
  applying ../create.patch
  $ cat foo
  a
  $ rm foo
  $ hg revert foo
  $ hg import --no-commit ../create2.patch
  applying ../create2.patch
  $ cat foo
  a

  $ cd ..

Issue1859: first line mistaken for email headers

  $ hg init emailconfusion
  $ cd emailconfusion
  $ cat > a.patch <<EOF
  > module: summary
  > 
  > description
  > 
  > 
  > diff -r 000000000000 -r 9b4c1e343b55 test.txt
  > --- /dev/null
  > +++ b/a
  > @@ -0,0 +1,1 @@
  > +a
  > EOF
  $ hg import -d '0 0' a.patch
  applying a.patch
  $ hg parents -v
  changeset:   0:5a681217c0ad
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  files:       a
  description:
  module: summary
  
  description
  
  
  $ cd ..


in commit message

  $ hg init commitconfusion
  $ cd commitconfusion
  $ cat > a.patch <<EOF
  > module: summary
  > 
  > --- description
  > 
  > diff --git a/a b/a
  > new file mode 100644
  > --- /dev/null
  > +++ b/a
  > @@ -0,0 +1,1 @@
  > +a
  > EOF
  > hg import -d '0 0' a.patch
  > hg parents -v
  > cd ..
  > 
  > echo '% tricky header splitting'
  > cat > trickyheaders.patch <<EOF
  > From: User A <user@a>
  > Subject: [PATCH] from: tricky!
  > 
  > # HG changeset patch
  > # User User B
  > # Date 1266264441 18000
  > # Branch stable
  > # Node ID f2be6a1170ac83bf31cb4ae0bad00d7678115bc0
  > # Parent  0000000000000000000000000000000000000000
  > from: tricky!
  > 
  > That is not a header.
  > 
  > diff -r 000000000000 -r f2be6a1170ac foo
  > --- /dev/null
  > +++ b/foo
  > @@ -0,0 +1,1 @@
  > +foo
  > EOF
  applying a.patch
  changeset:   0:f34d9187897d
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  files:       a
  description:
  module: summary
  
  
  % tricky header splitting

  $ hg init trickyheaders
  $ cd trickyheaders
  $ hg import -d '0 0' ../trickyheaders.patch
  applying ../trickyheaders.patch
  $ hg export --git tip
  # HG changeset patch
  # User User B
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID eb56ab91903632294ac504838508cb370c0901d2
  # Parent  0000000000000000000000000000000000000000
  from: tricky!
  
  That is not a header.
  
  diff --git a/foo b/foo
  new file mode 100644
  --- /dev/null
  +++ b/foo
  @@ -0,0 +1,1 @@
  +foo
  $ cd ..


Issue2102: hg export and hg import speak different languages

  $ hg init issue2102
  $ cd issue2102
  $ mkdir -p src/cmd/gc
  $ touch src/cmd/gc/mksys.bash
  $ hg ci -Am init
  adding src/cmd/gc/mksys.bash
  $ hg import - <<EOF
  > # HG changeset patch
  > # User Rob Pike
  > # Date 1216685449 25200
  > # Node ID 03aa2b206f499ad6eb50e6e207b9e710d6409c98
  > # Parent  93d10138ad8df586827ca90b4ddb5033e21a3a84
  > help management of empty pkg and lib directories in perforce
  > 
  > R=gri
  > DELTA=4  (4 added, 0 deleted, 0 changed)
  > OCL=13328
  > CL=13328
  > 
  > diff --git a/lib/place-holder b/lib/place-holder
  > new file mode 100644
  > --- /dev/null
  > +++ b/lib/place-holder
  > @@ -0,0 +1,2 @@
  > +perforce does not maintain empty directories.
  > +this file helps.
  > diff --git a/pkg/place-holder b/pkg/place-holder
  > new file mode 100644
  > --- /dev/null
  > +++ b/pkg/place-holder
  > @@ -0,0 +1,2 @@
  > +perforce does not maintain empty directories.
  > +this file helps.
  > diff --git a/src/cmd/gc/mksys.bash b/src/cmd/gc/mksys.bash
  > old mode 100644
  > new mode 100755
  > EOF
  applying patch from stdin

#if execbit

  $ hg sum
  parent: 1:d59915696727 tip
   help management of empty pkg and lib directories in perforce
  branch: default
  commit: (clean)
  update: (current)
  phases: 2 draft

  $ hg diff --git -c tip
  diff --git a/lib/place-holder b/lib/place-holder
  new file mode 100644
  --- /dev/null
  +++ b/lib/place-holder
  @@ -0,0 +1,2 @@
  +perforce does not maintain empty directories.
  +this file helps.
  diff --git a/pkg/place-holder b/pkg/place-holder
  new file mode 100644
  --- /dev/null
  +++ b/pkg/place-holder
  @@ -0,0 +1,2 @@
  +perforce does not maintain empty directories.
  +this file helps.
  diff --git a/src/cmd/gc/mksys.bash b/src/cmd/gc/mksys.bash
  old mode 100644
  new mode 100755

#else

  $ hg sum
  parent: 1:28f089cc9ccc tip
   help management of empty pkg and lib directories in perforce
  branch: default
  commit: (clean)
  update: (current)
  phases: 2 draft

  $ hg diff --git -c tip
  diff --git a/lib/place-holder b/lib/place-holder
  new file mode 100644
  --- /dev/null
  +++ b/lib/place-holder
  @@ -0,0 +1,2 @@
  +perforce does not maintain empty directories.
  +this file helps.
  diff --git a/pkg/place-holder b/pkg/place-holder
  new file mode 100644
  --- /dev/null
  +++ b/pkg/place-holder
  @@ -0,0 +1,2 @@
  +perforce does not maintain empty directories.
  +this file helps.

/* The mode change for mksys.bash is missing here, because on platforms  */
/* that don't support execbits, mode changes in patches are ignored when */
/* they are imported. This is obviously also the reason for why the hash */
/* in the created changeset is different to the one you see above the    */
/* #else clause */

#endif
  $ cd ..


diff lines looking like headers

  $ hg init difflineslikeheaders
  $ cd difflineslikeheaders
  $ echo a >a
  $ echo b >b
  $ echo c >c
  $ hg ci -Am1
  adding a
  adding b
  adding c

  $ echo "key: value" >>a
  $ echo "key: value" >>b
  $ echo "foo" >>c
  $ hg ci -m2

  $ hg up -C 0
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg diff --git -c1 >want
  $ hg diff -c1 | hg import --no-commit -
  applying patch from stdin
  $ hg diff --git >have
  $ diff want have
  $ cd ..

import a unified diff with no lines of context (diff -U0)

  $ hg init diffzero
  $ cd diffzero
  $ cat > f << EOF
  > c2
  > c4
  > c5
  > EOF
  $ hg commit -Am0
  adding f

  $ hg import --no-commit - << EOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > # Node ID f4974ab632f3dee767567b0576c0ec9a4508575c
  > # Parent  8679a12a975b819fae5f7ad3853a2886d143d794
  > 1
  > diff -r 8679a12a975b -r f4974ab632f3 f
  > --- a/f	Thu Jan 01 00:00:00 1970 +0000
  > +++ b/f	Thu Jan 01 00:00:00 1970 +0000
  > @@ -0,0 +1,1 @@
  > +c1
  > @@ -1,0 +3,1 @@
  > +c3
  > @@ -3,1 +4,0 @@
  > -c5
  > EOF
  applying patch from stdin

  $ cat f
  c1
  c2
  c3
  c4

  $ cd ..

commit message that looks like a diff header (issue1879)

  $ hg init headerlikemsg
  $ cd headerlikemsg
  $ touch empty
  $ echo nonempty >> nonempty
  $ hg ci -qAl - <<EOF
  > blah blah
  > diff blah
  > blah blah
  > EOF
  $ hg --config diff.git=1 log -pv
  changeset:   0:c6ef204ef767
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  files:       empty nonempty
  description:
  blah blah
  diff blah
  blah blah
  
  
  diff --git a/empty b/empty
  new file mode 100644
  diff --git a/nonempty b/nonempty
  new file mode 100644
  --- /dev/null
  +++ b/nonempty
  @@ -0,0 +1,1 @@
  +nonempty
  

 (without --git, empty file is lost, but commit message should be preserved)

  $ hg init plain
  $ hg export 0 | hg -R plain import -
  applying patch from stdin
  $ hg --config diff.git=1 -R plain log -pv
  changeset:   0:60a2d231e71f
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  files:       nonempty
  description:
  blah blah
  diff blah
  blah blah
  
  
  diff --git a/nonempty b/nonempty
  new file mode 100644
  --- /dev/null
  +++ b/nonempty
  @@ -0,0 +1,1 @@
  +nonempty
  

 (with --git, patch contents should be fully preserved)

  $ hg init git
  $ hg --config diff.git=1 export 0 | hg -R git import -
  applying patch from stdin
  $ hg --config diff.git=1 -R git log -pv
  changeset:   0:c6ef204ef767
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  files:       empty nonempty
  description:
  blah blah
  diff blah
  blah blah
  
  
  diff --git a/empty b/empty
  new file mode 100644
  diff --git a/nonempty b/nonempty
  new file mode 100644
  --- /dev/null
  +++ b/nonempty
  @@ -0,0 +1,1 @@
  +nonempty
  

  $ cd ..

no segfault while importing a unified diff which start line is zero but chunk
size is non-zero

  $ hg init startlinezero
  $ cd startlinezero
  $ echo foo > foo
  $ hg commit -Amfoo
  adding foo

  $ hg import --no-commit - << EOF
  > diff a/foo b/foo
  > --- a/foo
  > +++ b/foo
  > @@ -0,1 +0,1 @@
  >  foo
  > EOF
  applying patch from stdin

  $ cd ..

Test corner case involving fuzz and skew

  $ hg init morecornercases
  $ cd morecornercases

  $ cat > 01-no-context-beginning-of-file.diff <<EOF
  > diff --git a/a b/a
  > --- a/a
  > +++ b/a
  > @@ -1,0 +1,1 @@
  > +line
  > EOF

  $ cat > 02-no-context-middle-of-file.diff <<EOF
  > diff --git a/a b/a
  > --- a/a
  > +++ b/a
  > @@ -1,1 +1,1 @@
  > -2
  > +add some skew
  > @@ -2,0 +2,1 @@
  > +line
  > EOF

  $ cat > 03-no-context-end-of-file.diff <<EOF
  > diff --git a/a b/a
  > --- a/a
  > +++ b/a
  > @@ -10,0 +10,1 @@
  > +line
  > EOF

  $ cat > 04-middle-of-file-completely-fuzzed.diff <<EOF
  > diff --git a/a b/a
  > --- a/a
  > +++ b/a
  > @@ -1,1 +1,1 @@
  > -2
  > +add some skew
  > @@ -2,2 +2,3 @@
  >  not matching, should fuzz
  >  ... a bit
  > +line
  > EOF

  $ cat > a <<EOF
  > 1
  > 2
  > 3
  > 4
  > EOF
  $ hg ci -Am adda a
  $ for p in *.diff; do
  >   hg import -v --no-commit $p
  >   cat a
  >   hg revert -aqC a
  >   # patch -p1 < $p
  >   # cat a
  >   # hg revert -aC a
  > done
  applying 01-no-context-beginning-of-file.diff
  patching file a
  applied to working directory
  1
  line
  2
  3
  4
  applying 02-no-context-middle-of-file.diff
  patching file a
  Hunk #1 succeeded at 2 (offset 1 lines).
  Hunk #2 succeeded at 4 (offset 1 lines).
  applied to working directory
  1
  add some skew
  3
  line
  4
  applying 03-no-context-end-of-file.diff
  patching file a
  Hunk #1 succeeded at 5 (offset -6 lines).
  applied to working directory
  1
  2
  3
  4
  line
  applying 04-middle-of-file-completely-fuzzed.diff
  patching file a
  Hunk #1 succeeded at 2 (offset 1 lines).
  Hunk #2 succeeded at 5 with fuzz 2 (offset 1 lines).
  applied to working directory
  1
  add some skew
  3
  4
  line
  $ cd ..

Test partial application
------------------------

prepare a stack of patches depending on each other

  $ hg init partial
  $ cd partial
  $ cat << EOF > a
  > one
  > two
  > three
  > four
  > five
  > six
  > seven
  > EOF
  $ hg add a
  $ echo 'b' > b
  $ hg add b
  $ hg commit -m 'initial' -u Babar
  $ cat << EOF > a
  > one
  > two
  > 3
  > four
  > five
  > six
  > seven
  > EOF
  $ hg commit -m 'three' -u Celeste
  $ cat << EOF > a
  > one
  > two
  > 3
  > 4
  > five
  > six
  > seven
  > EOF
  $ hg commit -m 'four' -u Rataxes
  $ cat << EOF > a
  > one
  > two
  > 3
  > 4
  > 5
  > six
  > seven
  > EOF
  $ echo bb >> b
  $ hg commit -m 'five' -u Arthur
  $ echo 'Babar' > jungle
  $ hg add jungle
  $ hg ci -m 'jungle' -u Zephir
  $ echo 'Celeste' >> jungle
  $ hg ci -m 'extended jungle' -u Cornelius
  $ hg log -G --template '{desc|firstline} [{author}] {diffstat}\n'
  @  extended jungle [Cornelius] 1: +1/-0
  |
  o  jungle [Zephir] 1: +1/-0
  |
  o  five [Arthur] 2: +2/-1
  |
  o  four [Rataxes] 1: +1/-1
  |
  o  three [Celeste] 1: +1/-1
  |
  o  initial [Babar] 2: +8/-0
  
Adding those config options should not change the output of diffstat. Bugfix #4755.

  $ hg log -r . --template '{diffstat}\n'
  1: +1/-0
  $ hg log -r . --template '{diffstat}\n' --config diff.git=1 \
  >   --config diff.noprefix=1
  1: +1/-0

Importing with some success and some errors:

  $ hg update --rev 'desc(initial)'
  2 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg export --rev 'desc(five)' | hg import --partial -
  applying patch from stdin
  patching file a
  Hunk #1 FAILED at 1
  1 out of 1 hunks FAILED -- saving rejects to file a.rej
  patch applied partially
  (fix the .rej files and run `hg commit --amend`)
  [1]

  $ hg log -G --template '{desc|firstline} [{author}] {diffstat}\n'
  @  five [Arthur] 1: +1/-0
  |
  | o  extended jungle [Cornelius] 1: +1/-0
  | |
  | o  jungle [Zephir] 1: +1/-0
  | |
  | o  five [Arthur] 2: +2/-1
  | |
  | o  four [Rataxes] 1: +1/-1
  | |
  | o  three [Celeste] 1: +1/-1
  |/
  o  initial [Babar] 2: +8/-0
  
  $ hg export
  # HG changeset patch
  # User Arthur
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 26e6446bb2526e2be1037935f5fca2b2706f1509
  # Parent  8e4f0351909eae6b9cf68c2c076cb54c42b54b2e
  five
  
  diff -r 8e4f0351909e -r 26e6446bb252 b
  --- a/b	Thu Jan 01 00:00:00 1970 +0000
  +++ b/b	Thu Jan 01 00:00:00 1970 +0000
  @@ -1,1 +1,2 @@
   b
  +bb
  $ hg status -c .
  C a
  C b
  $ ls -A
  .hg
  a
  a.rej
  b

Importing with zero success:

  $ hg update --rev 'desc(initial)'
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg export --rev 'desc(four)' | hg import --partial -
  applying patch from stdin
  patching file a
  Hunk #1 FAILED at 0
  1 out of 1 hunks FAILED -- saving rejects to file a.rej
  patch applied partially
  (fix the .rej files and run `hg commit --amend`)
  [1]

  $ hg log -G --template '{desc|firstline} [{author}] {diffstat}\n'
  @  four [Rataxes] 0: +0/-0
  |
  | o  five [Arthur] 1: +1/-0
  |/
  | o  extended jungle [Cornelius] 1: +1/-0
  | |
  | o  jungle [Zephir] 1: +1/-0
  | |
  | o  five [Arthur] 2: +2/-1
  | |
  | o  four [Rataxes] 1: +1/-1
  | |
  | o  three [Celeste] 1: +1/-1
  |/
  o  initial [Babar] 2: +8/-0
  
  $ hg export
  # HG changeset patch
  # User Rataxes
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID cb9b1847a74d9ad52e93becaf14b98dbcc274e1e
  # Parent  8e4f0351909eae6b9cf68c2c076cb54c42b54b2e
  four
  
  $ hg status -c .
  C a
  C b
  $ ls -A
  .hg
  a
  a.rej
  b

Importing with unknown file:

  $ hg update --rev 'desc(initial)'
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg export --rev 'desc("extended jungle")' | hg import --partial -
  applying patch from stdin
  unable to find 'jungle' for patching
  (use '--prefix' to apply patch relative to the current directory)
  1 out of 1 hunks FAILED -- saving rejects to file jungle.rej
  patch applied partially
  (fix the .rej files and run `hg commit --amend`)
  [1]

  $ hg log -G --template '{desc|firstline} [{author}] {diffstat}\n'
  @  extended jungle [Cornelius] 0: +0/-0
  |
  | o  four [Rataxes] 0: +0/-0
  |/
  | o  five [Arthur] 1: +1/-0
  |/
  | o  extended jungle [Cornelius] 1: +1/-0
  | |
  | o  jungle [Zephir] 1: +1/-0
  | |
  | o  five [Arthur] 2: +2/-1
  | |
  | o  four [Rataxes] 1: +1/-1
  | |
  | o  three [Celeste] 1: +1/-1
  |/
  o  initial [Babar] 2: +8/-0
  
  $ hg export
  # HG changeset patch
  # User Cornelius
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 1fb1f86bef43c5a75918178f8d23c29fb0a7398d
  # Parent  8e4f0351909eae6b9cf68c2c076cb54c42b54b2e
  extended jungle
  
  $ hg status -c .
  C a
  C b
  $ ls -A
  .hg
  a
  a.rej
  b
  jungle.rej

Importing multiple failing patches:

  $ hg update --rev 'desc(initial)'
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo 'B' > b # just to make another commit
  $ hg commit -m "a new base"
  created new head
  $ hg export --rev 'desc("four") + desc("extended jungle")' | hg import --partial -
  applying patch from stdin
  patching file a
  Hunk #1 FAILED at 0
  1 out of 1 hunks FAILED -- saving rejects to file a.rej
  patch applied partially
  (fix the .rej files and run `hg commit --amend`)
  [1]
  $ hg log -G --template '{desc|firstline} [{author}] {diffstat}\n'
  @  four [Rataxes] 0: +0/-0
  |
  o  a new base [test] 1: +1/-1
  |
  | o  extended jungle [Cornelius] 0: +0/-0
  |/
  | o  four [Rataxes] 0: +0/-0
  |/
  | o  five [Arthur] 1: +1/-0
  |/
  | o  extended jungle [Cornelius] 1: +1/-0
  | |
  | o  jungle [Zephir] 1: +1/-0
  | |
  | o  five [Arthur] 2: +2/-1
  | |
  | o  four [Rataxes] 1: +1/-1
  | |
  | o  three [Celeste] 1: +1/-1
  |/
  o  initial [Babar] 2: +8/-0
  
  $ hg export
  # HG changeset patch
  # User Rataxes
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID a9d7b6d0ffbb4eb12b7d5939250fcd42e8930a1d
  # Parent  f59f8d2e95a8ca5b1b4ca64320140da85f3b44fd
  four
  
  $ hg status -c .
  C a
  C b

Importing some extra header
===========================

  $ cat > $TESTTMP/parseextra.py <<EOF
  > import mercurial.cmdutil
  > import mercurial.patch
  > 
  > def processfoo(repo, data, extra, opts):
  >     if b'foo' in data:
  >         extra[b'foo'] = data[b'foo']
  > def postimport(ctx):
  >     if b'foo' in ctx.extra():
  >         ctx.repo().ui.write(b'imported-foo: %s\n' % ctx.extra()[b'foo'])
  > 
  > mercurial.patch.patchheadermap.append((b'Foo', b'foo'))
  > mercurial.cmdutil.extrapreimport.append(b'foo')
  > mercurial.cmdutil.extrapreimportmap[b'foo'] = processfoo
  > mercurial.cmdutil.extrapostimport.append(b'foo')
  > mercurial.cmdutil.extrapostimportmap[b'foo'] = postimport
  > EOF
  $ cat >> $HGRCPATH <<EOF
  > [extensions]
  > parseextra=$TESTTMP/parseextra.py
  > EOF
  $ hg up -C tip
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat > $TESTTMP/foo.patch <<EOF
  > # HG changeset patch
  > # User Rataxes
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Foo bar
  > height
  > 
  > --- a/a	Thu Jan 01 00:00:00 1970 +0000
  > +++ b/a	Wed Oct 07 09:17:44 2015 +0000
  > @@ -5,3 +5,4 @@
  >  five
  >  six
  >  seven
  > +heigt
  > EOF
  $ hg import $TESTTMP/foo.patch
  applying $TESTTMP/foo.patch
  imported-foo: bar
  $ hg log --debug -r . | grep extra
  extra:       branch=default
  extra:       foo=bar

Warn the user that paths are relative to the root of
repository when file not found for patching

  $ mkdir filedir
  $ echo "file1" >> filedir/file1
  $ hg add filedir/file1
  $ hg commit -m "file1"
  $ cd filedir
  $ hg import -p 2 - <<EOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > file2
  > 
  > diff --git a/filedir/file1 b/filedir/file1
  > --- a/filedir/file1
  > +++ b/filedir/file1
  > @@ -1,1 +1,2 @@
  >  file1
  > +file2
  > EOF
  applying patch from stdin
  unable to find 'file1' for patching
  (use '--prefix' to apply patch relative to the current directory)
  1 out of 1 hunks FAILED -- saving rejects to file file1.rej
  abort: patch failed to apply
  [255]

test import crash (issue5375)
  $ cd ..
  $ hg init repo
  $ cd repo
  $ printf "diff --git a/a b/b\nrename from a\nrename to b" | hg import -
  applying patch from stdin
  a not tracked!
  abort: source file 'a' does not exist
  [255]

test immature end of hunk

  $ hg import - <<'EOF'
  > diff --git a/foo b/foo
  > --- a/foo
  > --- b/foo
  > @@ -0,0 +1,1 @@
  > EOF
  applying patch from stdin
  abort: bad hunk #1: incomplete hunk
  [255]

  $ hg import - <<'EOF'
  > diff --git a/foo b/foo
  > --- a/foo
  > --- b/foo
  > @@ -0,0 +1,1 @@
  > \ No newline at end of file
  > EOF
  applying patch from stdin
  abort: bad hunk #1: incomplete hunk
  [255]