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
$ . "$TESTDIR/histedit-helpers.sh"
$ cat >> $HGRCPATH <<EOF
> [extensions]
> histedit=
> strip=
> mockmakedate = $TESTDIR/mockmakedate.py
> EOF
$ initrepo ()
> {
> hg init r
> cd r
> for x in a b c d e f g; do
> echo $x > $x
> hg add $x
> hg ci -m $x
> done
> }
$ initrepo
log before edit
$ hg log --graph
@ changeset: 6:3c6a8ed2ebe8
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: g
|
o changeset: 5:652413bf663e
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: f
|
o changeset: 4:e860deea161a
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: e
|
o changeset: 3:055a42cdd887
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: d
|
o changeset: 2:177f92b77385
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: c
|
o changeset: 1:d2ae7f538514
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: b
|
o changeset: 0:cb9a9f314b8b
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: a
dirty a file
$ echo a > g
$ hg histedit 177f92b77385 --commands - 2>&1 << EOF
> EOF
abort: uncommitted changes
[255]
$ echo g > g
edit the history
$ hg histedit 177f92b77385 --commands - 2>&1 << EOF| fixbundle
> pick 177f92b77385 c
> pick 055a42cdd887 d
> edit e860deea161a e
> pick 652413bf663e f
> pick 3c6a8ed2ebe8 g
> EOF
0 files updated, 0 files merged, 3 files removed, 0 files unresolved
Editing (e860deea161a), you may commit or record as needed now.
(hg histedit --continue to resume)
try to update and get an error
$ hg update tip
abort: histedit in progress
(use 'hg histedit --continue' or 'hg histedit --abort')
[255]
edit the plan via the editor
$ cat >> $TESTTMP/editplan.sh <<EOF
> cat > \$1 <<EOF2
> drop e860deea161a e
> drop 652413bf663e f
> drop 3c6a8ed2ebe8 g
> EOF2
> EOF
$ HGEDITOR="sh $TESTTMP/editplan.sh" hg histedit --edit-plan
$ cat .hg/histedit-state
v1
055a42cdd88768532f9cf79daa407fc8d138de9b
3c6a8ed2ebe862cc949d2caa30775dd6f16fb799
False
3
drop
e860deea161a2f77de56603b340ebbb4536308ae
drop
652413bf663ef2a641cab26574e46d5f5a64a55a
drop
3c6a8ed2ebe862cc949d2caa30775dd6f16fb799
0
strip-backup/177f92b77385-0ebe6a8f-histedit.hg
edit the plan via --commands
$ hg histedit --edit-plan --commands - 2>&1 << EOF
> edit e860deea161a e
> pick 652413bf663e f
> drop 3c6a8ed2ebe8 g
> EOF
$ cat .hg/histedit-state
v1
055a42cdd88768532f9cf79daa407fc8d138de9b
3c6a8ed2ebe862cc949d2caa30775dd6f16fb799
False
3
edit
e860deea161a2f77de56603b340ebbb4536308ae
pick
652413bf663ef2a641cab26574e46d5f5a64a55a
drop
3c6a8ed2ebe862cc949d2caa30775dd6f16fb799
0
strip-backup/177f92b77385-0ebe6a8f-histedit.hg
Go at a random point and try to continue
$ hg id -n
3+
$ hg up 0
abort: histedit in progress
(use 'hg histedit --continue' or 'hg histedit --abort')
[255]
Try to delete necessary commit
$ hg strip -r 652413b
abort: histedit in progress, can't strip 652413bf663e
[255]
commit, then edit the revision
$ hg ci -m 'wat'
created new head
$ echo a > e
qnew should fail while we're in the middle of the edit step
$ hg --config extensions.mq= qnew please-fail
abort: histedit in progress
(use 'hg histedit --continue' or 'hg histedit --abort')
[255]
$ HGEDITOR='echo foobaz > ' hg histedit --continue 2>&1 | fixbundle
$ hg log --graph
@ changeset: 6:b5f70786f9b0
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: f
|
o changeset: 5:a5e1ba2f7afb
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: foobaz
|
o changeset: 4:1a60820cd1f6
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: wat
|
o changeset: 3:055a42cdd887
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: d
|
o changeset: 2:177f92b77385
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: c
|
o changeset: 1:d2ae7f538514
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: b
|
o changeset: 0:cb9a9f314b8b
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: a
$ hg cat e
a
Stripping necessary commits should not break --abort
$ hg histedit 1a60820cd1f6 --commands - 2>&1 << EOF| fixbundle
> edit 1a60820cd1f6 wat
> pick a5e1ba2f7afb foobaz
> pick b5f70786f9b0 g
> EOF
0 files updated, 0 files merged, 2 files removed, 0 files unresolved
Editing (1a60820cd1f6), you may commit or record as needed now.
(hg histedit --continue to resume)
$ mv .hg/histedit-state .hg/histedit-state.bak
$ hg strip -q -r b5f70786f9b0
$ mv .hg/histedit-state.bak .hg/histedit-state
$ hg histedit --abort
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 3 files
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg log -r .
changeset: 6:b5f70786f9b0
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: f
check histedit_source
$ hg log --debug --rev 5
changeset: 5:a5e1ba2f7afb899ef1581cea528fd885d2fca70d
phase: draft
parent: 4:1a60820cd1f6004a362aa622ebc47d59bc48eb34
parent: -1:0000000000000000000000000000000000000000
manifest: 5:5ad3be8791f39117565557781f5464363b918a45
user: test
date: Thu Jan 01 00:00:00 1970 +0000
files: e
extra: branch=default
extra: histedit_source=e860deea161a2f77de56603b340ebbb4536308ae
description:
foobaz
$ hg histedit tip --commands - 2>&1 <<EOF| fixbundle
> edit b5f70786f9b0 f
> EOF
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
Editing (b5f70786f9b0), you may commit or record as needed now.
(hg histedit --continue to resume)
$ hg status
A f
$ hg summary
parent: 5:a5e1ba2f7afb
foobaz
branch: default
commit: 1 added (new branch head)
update: 1 new changesets (update)
phases: 7 draft
hist: 1 remaining (histedit --continue)
(test also that editor is invoked if histedit is continued for
"edit" action)
$ HGEDITOR='cat' hg histedit --continue
f
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: added f
saved backup bundle to $TESTTMP/r/.hg/strip-backup/b5f70786f9b0-c28d9c86-histedit.hg
$ hg status
log after edit
$ hg log --limit 1
changeset: 6:a107ee126658
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: f
say we'll change the message, but don't.
$ cat > ../edit.sh <<EOF
> cat "\$1" | sed s/pick/mess/ > tmp
> mv tmp "\$1"
> EOF
$ HGEDITOR="sh ../edit.sh" hg histedit tip 2>&1 | fixbundle
$ hg status
$ hg log --limit 1
changeset: 6:1fd3b2fe7754
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: f
modify the message
check saving last-message.txt, at first
$ cat > $TESTTMP/commitfailure.py <<EOF
> from mercurial import error
> def reposetup(ui, repo):
> class commitfailure(repo.__class__):
> def commit(self, *args, **kwargs):
> raise error.Abort('emulating unexpected abort')
> repo.__class__ = commitfailure
> EOF
$ cat >> .hg/hgrc <<EOF
> [extensions]
> # this failure occurs before editor invocation
> commitfailure = $TESTTMP/commitfailure.py
> EOF
$ cat > $TESTTMP/editor.sh <<EOF
> echo "==== before editing"
> cat \$1
> echo "===="
> echo "check saving last-message.txt" >> \$1
> EOF
(test that editor is not invoked before transaction starting)
$ rm -f .hg/last-message.txt
$ HGEDITOR="sh $TESTTMP/editor.sh" hg histedit tip --commands - 2>&1 << EOF | fixbundle
> mess 1fd3b2fe7754 f
> EOF
abort: emulating unexpected abort
$ test -f .hg/last-message.txt
[1]
$ cat >> .hg/hgrc <<EOF
> [extensions]
> commitfailure = !
> EOF
$ hg histedit --abort -q
(test that editor is invoked and commit message is saved into
"last-message.txt")
$ cat >> .hg/hgrc <<EOF
> [hooks]
> # this failure occurs after editor invocation
> pretxncommit.unexpectedabort = false
> EOF
$ hg status --rev '1fd3b2fe7754^1' --rev 1fd3b2fe7754
A f
$ rm -f .hg/last-message.txt
$ HGEDITOR="sh $TESTTMP/editor.sh" hg histedit tip --commands - 2>&1 << EOF
> mess 1fd3b2fe7754 f
> EOF
==== before editing
f
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: added f
====
transaction abort!
rollback completed
note: commit message saved in .hg/last-message.txt
abort: pretxncommit.unexpectedabort hook exited with status 1
[255]
$ cat .hg/last-message.txt
f
check saving last-message.txt
(test also that editor is invoked if histedit is continued for "message"
action)
$ HGEDITOR=cat hg histedit --continue
f
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: added f
transaction abort!
rollback completed
note: commit message saved in .hg/last-message.txt
abort: pretxncommit.unexpectedabort hook exited with status 1
[255]
$ cat >> .hg/hgrc <<EOF
> [hooks]
> pretxncommit.unexpectedabort =
> EOF
$ hg histedit --abort -q
then, check "modify the message" itself
$ hg histedit tip --commands - 2>&1 << EOF | fixbundle
> mess 1fd3b2fe7754 f
> EOF
$ hg status
$ hg log --limit 1
changeset: 6:62feedb1200e
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: f
rollback should not work after a histedit
$ hg rollback
no rollback information available
[1]
$ cd ..
$ hg clone -qr0 r r0
$ cd r0
$ hg phase -fdr0
$ hg histedit --commands - 0 2>&1 << EOF
> edit cb9a9f314b8b a > $EDITED
> EOF
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
Editing (cb9a9f314b8b), you may commit or record as needed now.
(hg histedit --continue to resume)
[1]
$ HGEDITOR=true hg histedit --continue
saved backup bundle to $TESTTMP/r0/.hg/strip-backup/cb9a9f314b8b-cc5ccb0b-histedit.hg
$ hg log -G
@ changeset: 0:0efcea34f18a
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: a
$ echo foo >> b
$ hg addr
adding b
$ hg ci -m 'add b'
$ echo foo >> a
$ hg ci -m 'extend a'
$ hg phase --public 1
Attempting to fold a change into a public change should not work:
$ cat > ../edit.sh <<EOF
> cat "\$1" | sed s/pick/fold/ > tmp
> mv tmp "\$1"
> EOF
$ HGEDITOR="sh ../edit.sh" hg histedit 2
warning: histedit rules saved to: .hg/histedit-last-edit.txt
hg: parse error: first changeset cannot use verb "fold"
[255]
$ cat .hg/histedit-last-edit.txt
fold 0012be4a27ea 2 extend a
# Edit history between 0012be4a27ea and 0012be4a27ea
#
# Commits are listed from least to most recent
#
# You can reorder changesets by reordering the lines
#
# Commands:
#
# e, edit = use commit, but stop for amending
# m, mess = edit commit message without changing commit content
# p, fold = use commit
# b, base = checkout changeset and apply further changesets from there
# d, drop = remove commit from history
# f, fold = use commit, but combine it with the one above
# r, roll = like fold, but discard this commit's description and date
#
$ cd ..
============================================
Test update-timestamp config option in mess|
============================================
$ addwithdate ()
> {
> echo $1 > $1
> hg add $1
> hg ci -m $1 -d "$2 0"
> }
$ initrepo ()
> {
> hg init r2
> cd r2
> addwithdate a 1
> addwithdate b 2
> addwithdate c 3
> addwithdate d 4
> addwithdate e 5
> addwithdate f 6
> }
$ initrepo
log before edit
$ hg log --limit 1
changeset: 5:178e35e0ce73
tag: tip
user: test
date: Thu Jan 01 00:00:06 1970 +0000
summary: f
$ hg histedit tip --commands - 2>&1 --config rewrite.update-timestamp=True << EOF | fixbundle
> mess 178e35e0ce73 f
> EOF
log after edit
$ hg log --limit 1
changeset: 5:98bf456d476b
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: f
$ cd ..
warn the user on editing tagged commits
$ hg init issue4017
$ cd issue4017
$ echo > a
$ hg ci -Am 'add a'
adding a
$ hg tag a
$ hg tags
tip 1:bd7ee4f3939b
a 0:a8a82d372bb3
$ hg histedit
warning: tags associated with the given changeset will be lost after histedit.
do you want to continue (yN)? n
abort: histedit cancelled
[255]
$ cd ..