tests/test-mq-header-from.t

commit: improve the files field of changelog for merges

Currently, the files list of merge commits repeats all the deletions
(either actual deletions, or files that got renamed) that happened
between base and p2 of the merge. If p2 is the main branch, the list
can easily be much bigger than the change being merged.

This results in various problems worth improving:
- changelog is bigger than necessary
- `hg log directory` lists many unrelated merge commits, and `hg log
  -v -r commit` frequently fills multiple screens worth of files
- it possibly slows down adjustlinkrev, by forcing it to read more
  manifests, and that function can certainly be a bottleneck
- the server side of pulls can waste a lot of time simply opening the
  filelogs for pointless files (the constant factors for opening even
  a tiny filelog is apparently pretty bad)

So stop listing such files as described in the code.  Impacted merge
commits and their descendants get a different hash than they would
have without this. This doesn't seem problematic, except for
convert. The previous commit helped with that in the hg->hg case (but
if you do svn->hg twice from scratch, hashes can still change).

The rest of the description is numbers. I don't have much to report,
because recreating the files list of existing repositories is not
easy:
- debugupgradeformat and bundle/unbundle don't recreate the list
- export/import tends to choke quickly applying patches or on
  description that contain diffs,
- merge commits from the convert extension don't have the right files
  list for reasons orthogonal to the current commit
- replaying the merge with hg update/hg merge/hg revert --all/hg
  commit can end up failing in hg revert
- I wasn't sure that using debugsetparents + debugrebuilddirstate
  would really build the right thing

I measured commit time before and after this change, in a case with no
files filtered out, several files filtered out (no difference) and 5k
files filtered out (+1% time).

Recreating the 100 more recent merges in a private repo, the
concatenated uncompressed files lists goes from 1.12MB to
0.52MB. Excluding 3 merges that are not representative, then the size
goes from 570k to 15k.
I converted part of mozilla-central, and observed file list shrinking
quite a bit too, starting at the very first merge, 733641d9feaf, going
from 550 files to 10 files (although they have relatively few merges,
so they probably wouldn't care).

Differential Revision: https://phab.mercurial-scm.org/D6613

  $ echo "[extensions]" >> $HGRCPATH
  $ echo "mq=" >> $HGRCPATH
  $ echo "[diff]" >> $HGRCPATH
  $ echo "nodates=true" >> $HGRCPATH
  $ catlog() {
  >     cat .hg/patches/$1.patch | sed -e "s/^diff \-r [0-9a-f]* /diff -r ... /" \
  >                                    -e "s/^\(# Parent \).*/\1/"
  >     hg log --template "{rev}: {node|short} {desc} - {author}\n"
  > }
  $ runtest() {
  >     echo ==== init
  >     hg init a
  >     cd a
  >     hg qinit
  > 
  > 
  >     echo ==== qnew -U
  >     hg qnew -U 1.patch
  >     catlog 1
  > 
  >     echo ==== qref
  >     echo "1" >1
  >     hg add
  >     hg qref
  >     catlog 1
  > 
  >     echo ==== qref -u
  >     hg qref -u mary
  >     catlog 1
  > 
  >     echo ==== qnew
  >     hg qnew 2.patch
  >     echo "2" >2
  >     hg add
  >     hg qref
  >     catlog 2
  > 
  >     echo ==== qref -u
  >     hg qref -u jane
  >     catlog 2
  > 
  > 
  >     echo ==== qnew -U -m
  >     hg qnew -U -m "Three" 3.patch
  >     catlog 3
  > 
  >     echo ==== qref
  >     echo "3" >3
  >     hg add
  >     hg qref
  >     catlog 3
  > 
  >     echo ==== qref -m
  >     hg qref -m "Drei"
  >     catlog 3
  > 
  >     echo ==== qref -u
  >     hg qref -u mary
  >     catlog 3
  > 
  >     echo ==== qref -u -m
  >     hg qref -u maria -m "Three (again)"
  >     catlog 3
  > 
  >     echo ==== qnew -m
  >     hg qnew -m "Four" 4.patch
  >     echo "4" >4of t
  >     hg add
  >     hg qref
  >     catlog 4
  > 
  >     echo ==== qref -u
  >     hg qref -u jane
  >     catlog 4
  > 
  > 
  >     echo ==== qnew with HG header
  >     hg qnew --config 'mq.plain=true' 5.patch
  >     hg qpop
  >     echo "# HG changeset patch" >>.hg/patches/5.patch
  >     echo "# User johndoe" >>.hg/patches/5.patch
  >     hg qpush 2>&1 | grep 'now at'
  >     catlog 5
  > 
  >     echo ==== hg qref
  >     echo "5" >5
  >     hg add
  >     hg qref
  >     catlog 5
  > 
  >     echo ==== hg qref -U
  >     hg qref -U
  >     catlog 5
  > 
  >     echo ==== hg qref -u
  >     hg qref -u johndeere
  >     catlog 5
  > 
  > 
  >     echo ==== qnew with plain header
  >     hg qnew --config 'mq.plain=true' -U 6.patch
  >     hg qpop
  >     hg qpush 2>&1 | grep 'now at'
  >     catlog 6
  > 
  >     echo ==== hg qref
  >     echo "6" >6
  >     hg add
  >     hg qref
  >     catlog 6
  > 
  >     echo ==== hg qref -U
  >     hg qref -U
  >     catlog 6
  > 
  >     echo ==== hg qref -u
  >     hg qref -u johndeere
  >     catlog 6
  > 
  > 
  >     echo ==== "qpop -a / qpush -a"
  >     hg qpop -a
  >     hg qpush -a
  >     hg log --template "{rev}: {node|short} {desc} - {author}\n"
  > }

======= plain headers

  $ echo "[mq]" >> $HGRCPATH
  $ echo "plain=true" >> $HGRCPATH
  $ mkdir sandbox
  $ (cd sandbox ; runtest)
  ==== init
  ==== qnew -U
  From: test
  
  0: a054644889e5 [mq]: 1.patch - test
  ==== qref
  adding 1
  From: test
  
  diff -r ... 1
  --- /dev/null
  +++ b/1
  @@ -0,0 +1,1 @@
  +1
  0: 2905f1e46ee0 [mq]: 1.patch - test
  ==== qref -u
  From: mary
  
  diff -r ... 1
  --- /dev/null
  +++ b/1
  @@ -0,0 +1,1 @@
  +1
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qnew
  adding 2
  diff -r ... 2
  --- /dev/null
  +++ b/2
  @@ -0,0 +1,1 @@
  +2
  1: 527f98a12a7a [mq]: 2.patch - test
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref -u
  From: jane
  
  diff -r ... 2
  --- /dev/null
  +++ b/2
  @@ -0,0 +1,1 @@
  +2
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qnew -U -m
  From: test
  
  Three
  
  2: 0ffa16a9088e Three - test
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref
  adding 3
  From: test
  
  Three
  
  diff -r ... 3
  --- /dev/null
  +++ b/3
  @@ -0,0 +1,1 @@
  +3
  2: 83f1290c6086 Three - test
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref -m
  From: test
  
  Drei
  
  diff -r ... 3
  --- /dev/null
  +++ b/3
  @@ -0,0 +1,1 @@
  +3
  2: b0d856328d4d Drei - test
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref -u
  From: mary
  
  Drei
  
  diff -r ... 3
  --- /dev/null
  +++ b/3
  @@ -0,0 +1,1 @@
  +3
  2: bb9d4b28e6a6 Drei - mary
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref -u -m
  From: maria
  
  Three (again)
  
  diff -r ... 3
  --- /dev/null
  +++ b/3
  @@ -0,0 +1,1 @@
  +3
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qnew -m
  adding 4of
  Four
  
  diff -r ... 4of
  --- /dev/null
  +++ b/4of
  @@ -0,0 +1,1 @@
  +4 t
  3: b9f922d0da40 Four - test
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref -u
  From: jane
  
  Four
  
  diff -r ... 4of
  --- /dev/null
  +++ b/4of
  @@ -0,0 +1,1 @@
  +4 t
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qnew with HG header
  popping 5.patch
  now at: 4.patch
  now at: 5.patch
  # HG changeset patch
  # User johndoe
  4: 72bc4a0467ef imported patch 5.patch - johndoe
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref
  adding 5
  # HG changeset patch
  # User johndoe
  # Parent 
  
  diff -r ... 5
  --- /dev/null
  +++ b/5
  @@ -0,0 +1,1 @@
  +5
  4: ff5c06112e5a [mq]: 5.patch - johndoe
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref -U
  # HG changeset patch
  # User test
  # Parent 
  
  diff -r ... 5
  --- /dev/null
  +++ b/5
  @@ -0,0 +1,1 @@
  +5
  4: c947416c22b1 [mq]: 5.patch - test
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref -u
  # HG changeset patch
  # User johndeere
  # Parent 
  
  diff -r ... 5
  --- /dev/null
  +++ b/5
  @@ -0,0 +1,1 @@
  +5
  4: 1d898e201a22 [mq]: 5.patch - johndeere
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qnew with plain header
  popping 6.patch
  now at: 5.patch
  now at: 6.patch
  From: test
  
  5: 7825a18ec839 imported patch 6.patch - test
  4: 1d898e201a22 [mq]: 5.patch - johndeere
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref
  adding 6
  From: test
  
  diff -r ... 6
  --- /dev/null
  +++ b/6
  @@ -0,0 +1,1 @@
  +6
  5: 09d19592680d [mq]: 6.patch - test
  4: 1d898e201a22 [mq]: 5.patch - johndeere
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref -U
  From: test
  
  diff -r ... 6
  --- /dev/null
  +++ b/6
  @@ -0,0 +1,1 @@
  +6
  5: 09d19592680d [mq]: 6.patch - test
  4: 1d898e201a22 [mq]: 5.patch - johndeere
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref -u
  From: johndeere
  
  diff -r ... 6
  --- /dev/null
  +++ b/6
  @@ -0,0 +1,1 @@
  +6
  5: 32641ee07196 [mq]: 6.patch - johndeere
  4: 1d898e201a22 [mq]: 5.patch - johndeere
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qpop -a / qpush -a
  popping 6.patch
  popping 5.patch
  popping 4.patch
  popping 3.patch
  popping 2.patch
  popping 1.patch
  patch queue now empty
  applying 1.patch
  applying 2.patch
  applying 3.patch
  applying 4.patch
  applying 5.patch
  applying 6.patch
  now at: 6.patch
  5: 1fb083c80457 imported patch 6.patch - johndeere
  4: 7e96e969691d imported patch 5.patch - johndeere
  3: c7147533d3cd Four - jane
  2: b383d04401ea Three (again) - maria
  1: fac2da4efc3c imported patch 2.patch - jane
  0: b6e237e8771b imported patch 1.patch - mary
  $ rm -r sandbox

======= hg headers

  $ echo "plain=false" >> $HGRCPATH
  $ mkdir sandbox
  $ (cd sandbox ; runtest)
  ==== init
  ==== qnew -U
  # HG changeset patch
  # User test
  # Parent 
  
  0: a054644889e5 [mq]: 1.patch - test
  ==== qref
  adding 1
  # HG changeset patch
  # User test
  # Parent 
  
  diff -r ... 1
  --- /dev/null
  +++ b/1
  @@ -0,0 +1,1 @@
  +1
  0: 2905f1e46ee0 [mq]: 1.patch - test
  ==== qref -u
  # HG changeset patch
  # User mary
  # Parent 
  
  diff -r ... 1
  --- /dev/null
  +++ b/1
  @@ -0,0 +1,1 @@
  +1
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qnew
  adding 2
  # HG changeset patch
  # Parent 
  
  diff -r ... 2
  --- /dev/null
  +++ b/2
  @@ -0,0 +1,1 @@
  +2
  1: 527f98a12a7a [mq]: 2.patch - test
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref -u
  # HG changeset patch
  # User jane
  # Parent 
  
  diff -r ... 2
  --- /dev/null
  +++ b/2
  @@ -0,0 +1,1 @@
  +2
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qnew -U -m
  # HG changeset patch
  # User test
  # Parent 
  Three
  
  2: 0ffa16a9088e Three - test
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref
  adding 3
  # HG changeset patch
  # User test
  # Parent 
  Three
  
  diff -r ... 3
  --- /dev/null
  +++ b/3
  @@ -0,0 +1,1 @@
  +3
  2: 83f1290c6086 Three - test
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref -m
  # HG changeset patch
  # User test
  # Parent 
  Drei
  
  diff -r ... 3
  --- /dev/null
  +++ b/3
  @@ -0,0 +1,1 @@
  +3
  2: b0d856328d4d Drei - test
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref -u
  # HG changeset patch
  # User mary
  # Parent 
  Drei
  
  diff -r ... 3
  --- /dev/null
  +++ b/3
  @@ -0,0 +1,1 @@
  +3
  2: bb9d4b28e6a6 Drei - mary
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref -u -m
  # HG changeset patch
  # User maria
  # Parent 
  Three (again)
  
  diff -r ... 3
  --- /dev/null
  +++ b/3
  @@ -0,0 +1,1 @@
  +3
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qnew -m
  adding 4of
  # HG changeset patch
  # Parent 
  Four
  
  diff -r ... 4of
  --- /dev/null
  +++ b/4of
  @@ -0,0 +1,1 @@
  +4 t
  3: b9f922d0da40 Four - test
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref -u
  # HG changeset patch
  # User jane
  # Parent 
  Four
  
  diff -r ... 4of
  --- /dev/null
  +++ b/4of
  @@ -0,0 +1,1 @@
  +4 t
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qnew with HG header
  popping 5.patch
  now at: 4.patch
  now at: 5.patch
  # HG changeset patch
  # User johndoe
  4: 72bc4a0467ef imported patch 5.patch - johndoe
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref
  adding 5
  # HG changeset patch
  # User johndoe
  # Parent 
  
  diff -r ... 5
  --- /dev/null
  +++ b/5
  @@ -0,0 +1,1 @@
  +5
  4: ff5c06112e5a [mq]: 5.patch - johndoe
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref -U
  # HG changeset patch
  # User test
  # Parent 
  
  diff -r ... 5
  --- /dev/null
  +++ b/5
  @@ -0,0 +1,1 @@
  +5
  4: c947416c22b1 [mq]: 5.patch - test
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref -u
  # HG changeset patch
  # User johndeere
  # Parent 
  
  diff -r ... 5
  --- /dev/null
  +++ b/5
  @@ -0,0 +1,1 @@
  +5
  4: 1d898e201a22 [mq]: 5.patch - johndeere
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qnew with plain header
  popping 6.patch
  now at: 5.patch
  now at: 6.patch
  From: test
  
  5: 7825a18ec839 imported patch 6.patch - test
  4: 1d898e201a22 [mq]: 5.patch - johndeere
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref
  adding 6
  From: test
  
  diff -r ... 6
  --- /dev/null
  +++ b/6
  @@ -0,0 +1,1 @@
  +6
  5: 09d19592680d [mq]: 6.patch - test
  4: 1d898e201a22 [mq]: 5.patch - johndeere
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref -U
  From: test
  
  diff -r ... 6
  --- /dev/null
  +++ b/6
  @@ -0,0 +1,1 @@
  +6
  5: 09d19592680d [mq]: 6.patch - test
  4: 1d898e201a22 [mq]: 5.patch - johndeere
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref -u
  From: johndeere
  
  diff -r ... 6
  --- /dev/null
  +++ b/6
  @@ -0,0 +1,1 @@
  +6
  5: 32641ee07196 [mq]: 6.patch - johndeere
  4: 1d898e201a22 [mq]: 5.patch - johndeere
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qpop -a / qpush -a
  popping 6.patch
  popping 5.patch
  popping 4.patch
  popping 3.patch
  popping 2.patch
  popping 1.patch
  patch queue now empty
  applying 1.patch
  applying 2.patch
  applying 3.patch
  applying 4.patch
  applying 5.patch
  applying 6.patch
  now at: 6.patch
  5: 1fb083c80457 imported patch 6.patch - johndeere
  4: 7e96e969691d imported patch 5.patch - johndeere
  3: c7147533d3cd Four - jane
  2: b383d04401ea Three (again) - maria
  1: fac2da4efc3c imported patch 2.patch - jane
  0: b6e237e8771b imported patch 1.patch - mary
  $ rm -r sandbox
  $ runtest
  ==== init
  ==== qnew -U
  # HG changeset patch
  # User test
  # Parent 
  
  0: a054644889e5 [mq]: 1.patch - test
  ==== qref
  adding 1
  # HG changeset patch
  # User test
  # Parent 
  
  diff -r ... 1
  --- /dev/null
  +++ b/1
  @@ -0,0 +1,1 @@
  +1
  0: 2905f1e46ee0 [mq]: 1.patch - test
  ==== qref -u
  # HG changeset patch
  # User mary
  # Parent 
  
  diff -r ... 1
  --- /dev/null
  +++ b/1
  @@ -0,0 +1,1 @@
  +1
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qnew
  adding 2
  # HG changeset patch
  # Parent 
  
  diff -r ... 2
  --- /dev/null
  +++ b/2
  @@ -0,0 +1,1 @@
  +2
  1: 527f98a12a7a [mq]: 2.patch - test
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref -u
  # HG changeset patch
  # User jane
  # Parent 
  
  diff -r ... 2
  --- /dev/null
  +++ b/2
  @@ -0,0 +1,1 @@
  +2
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qnew -U -m
  # HG changeset patch
  # User test
  # Parent 
  Three
  
  2: 0ffa16a9088e Three - test
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref
  adding 3
  # HG changeset patch
  # User test
  # Parent 
  Three
  
  diff -r ... 3
  --- /dev/null
  +++ b/3
  @@ -0,0 +1,1 @@
  +3
  2: 83f1290c6086 Three - test
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref -m
  # HG changeset patch
  # User test
  # Parent 
  Drei
  
  diff -r ... 3
  --- /dev/null
  +++ b/3
  @@ -0,0 +1,1 @@
  +3
  2: b0d856328d4d Drei - test
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref -u
  # HG changeset patch
  # User mary
  # Parent 
  Drei
  
  diff -r ... 3
  --- /dev/null
  +++ b/3
  @@ -0,0 +1,1 @@
  +3
  2: bb9d4b28e6a6 Drei - mary
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref -u -m
  # HG changeset patch
  # User maria
  # Parent 
  Three (again)
  
  diff -r ... 3
  --- /dev/null
  +++ b/3
  @@ -0,0 +1,1 @@
  +3
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qnew -m
  adding 4of
  # HG changeset patch
  # Parent 
  Four
  
  diff -r ... 4of
  --- /dev/null
  +++ b/4of
  @@ -0,0 +1,1 @@
  +4 t
  3: b9f922d0da40 Four - test
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qref -u
  # HG changeset patch
  # User jane
  # Parent 
  Four
  
  diff -r ... 4of
  --- /dev/null
  +++ b/4of
  @@ -0,0 +1,1 @@
  +4 t
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qnew with HG header
  popping 5.patch
  now at: 4.patch
  now at: 5.patch
  # HG changeset patch
  # User johndoe
  4: 72bc4a0467ef imported patch 5.patch - johndoe
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref
  adding 5
  # HG changeset patch
  # User johndoe
  # Parent 
  
  diff -r ... 5
  --- /dev/null
  +++ b/5
  @@ -0,0 +1,1 @@
  +5
  4: ff5c06112e5a [mq]: 5.patch - johndoe
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref -U
  # HG changeset patch
  # User test
  # Parent 
  
  diff -r ... 5
  --- /dev/null
  +++ b/5
  @@ -0,0 +1,1 @@
  +5
  4: c947416c22b1 [mq]: 5.patch - test
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref -u
  # HG changeset patch
  # User johndeere
  # Parent 
  
  diff -r ... 5
  --- /dev/null
  +++ b/5
  @@ -0,0 +1,1 @@
  +5
  4: 1d898e201a22 [mq]: 5.patch - johndeere
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qnew with plain header
  popping 6.patch
  now at: 5.patch
  now at: 6.patch
  From: test
  
  5: 7825a18ec839 imported patch 6.patch - test
  4: 1d898e201a22 [mq]: 5.patch - johndeere
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref
  adding 6
  From: test
  
  diff -r ... 6
  --- /dev/null
  +++ b/6
  @@ -0,0 +1,1 @@
  +6
  5: 09d19592680d [mq]: 6.patch - test
  4: 1d898e201a22 [mq]: 5.patch - johndeere
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref -U
  From: test
  
  diff -r ... 6
  --- /dev/null
  +++ b/6
  @@ -0,0 +1,1 @@
  +6
  5: 09d19592680d [mq]: 6.patch - test
  4: 1d898e201a22 [mq]: 5.patch - johndeere
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== hg qref -u
  From: johndeere
  
  diff -r ... 6
  --- /dev/null
  +++ b/6
  @@ -0,0 +1,1 @@
  +6
  5: 32641ee07196 [mq]: 6.patch - johndeere
  4: 1d898e201a22 [mq]: 5.patch - johndeere
  3: 0dfb3111e7ee Four - jane
  2: a6686ee84fc3 Three (again) - maria
  1: a425cde5f493 [mq]: 2.patch - jane
  0: 3682f830e656 [mq]: 1.patch - mary
  ==== qpop -a / qpush -a
  popping 6.patch
  popping 5.patch
  popping 4.patch
  popping 3.patch
  popping 2.patch
  popping 1.patch
  patch queue now empty
  applying 1.patch
  applying 2.patch
  applying 3.patch
  applying 4.patch
  applying 5.patch
  applying 6.patch
  now at: 6.patch
  5: 1fb083c80457 imported patch 6.patch - johndeere
  4: 7e96e969691d imported patch 5.patch - johndeere
  3: c7147533d3cd Four - jane
  2: b383d04401ea Three (again) - maria
  1: fac2da4efc3c imported patch 2.patch - jane
  0: b6e237e8771b imported patch 1.patch - mary

  $ cd ..