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wireprotov2: implement commands as a generator of objects...
wireprotov2: implement commands as a generator of objects Previously, wire protocol version 2 inherited version 1's model of having separate types to represent the results of different wire protocol commands. As I implemented more powerful commands in future commits, I found I was using a common pattern of returning a special type to hold a generator. This meant the command function required a closure to do most of the work. That made logic flow more difficult to follow. I also noticed that many commands were effectively a sequence of objects to be CBOR encoded. I think it makes sense to define version 2 commands as generators. This way, commands can simply emit the data structures they wish to send to the client. This eliminates the need for a closure in command functions and removes encoding from the bodies of commands. As part of this commit, the handling of response objects has been moved into the serverreactor class. This puts the reactor in the driver's seat with regards to CBOR encoding and error handling. Having error handling in the function that emits frames is particularly important because exceptions in that function can lead to things getting in a bad state: I'm fairly certain that uncaught exceptions in the frame generator were causing deadlocks. I also introduced a dedicated error type for explicit error reporting in command handlers. This will be used in subsequent commits. There's still a bit of work to be done here, especially around formalizing the error handling "protocol." I've added yet another TODO to track this so we don't forget. Test output changed because we're using generators and no longer know we are at the end of the data until we hit the end of the generator. This means we can't emit the end-of-stream flag until we've exhausted the generator. Hence the introduction of 0-sized end-of-stream frames. Differential Revision: https://phab.mercurial-scm.org/D4472
Matt Harbison - - Load All Authors

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test-histedit-fold.t
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Test histedit extension: Fold commands
======================================
This test file is dedicated to testing the fold command in non conflicting
case.
Initialization
---------------
$ . "$TESTDIR/histedit-helpers.sh"
$ cat >> $HGRCPATH <<EOF
> [alias]
> logt = log --template '{rev}:{node|short} {desc|firstline}\n'
> [extensions]
> histedit=
> EOF
Simple folding
--------------------
$ addwithdate ()
> {
> echo $1 > $1
> hg add $1
> hg ci -m $1 -d "$2 0"
> }
$ initrepo ()
> {
> hg init r
> cd r
> addwithdate a 1
> addwithdate b 2
> addwithdate c 3
> addwithdate d 4
> addwithdate e 5
> addwithdate f 6
> }
$ initrepo
log before edit
$ hg logt --graph
@ 5:178e35e0ce73 f
|
o 4:1ddb6c90f2ee e
|
o 3:532247a8969b d
|
o 2:ff2c9fa2018b c
|
o 1:97d72e5f12c7 b
|
o 0:8580ff50825a a
$ hg histedit ff2c9fa2018b --commands - 2>&1 <<EOF | fixbundle
> pick 1ddb6c90f2ee e
> pick 178e35e0ce73 f
> fold ff2c9fa2018b c
> pick 532247a8969b d
> EOF
log after edit
$ hg logt --graph
@ 4:c4d7f3def76d d
|
o 3:575228819b7e f
|
o 2:505a591af19e e
|
o 1:97d72e5f12c7 b
|
o 0:8580ff50825a a
post-fold manifest
$ hg manifest
a
b
c
d
e
f
check histedit_source, including that it uses the later date, from the first changeset
$ hg log --debug --rev 3
changeset: 3:575228819b7e6ed69e8c0a6a383ee59a80db7358
phase: draft
parent: 2:505a591af19eed18f560af827b9e03d2076773dc
parent: -1:0000000000000000000000000000000000000000
manifest: 3:81eede616954057198ead0b2c73b41d1f392829a
user: test
date: Thu Jan 01 00:00:06 1970 +0000
files+: c f
extra: branch=default
extra: histedit_source=7cad1d7030207872dfd1c3a7cb430f24f2884086,ff2c9fa2018b15fa74b33363bda9527323e2a99f
description:
f
***
c
rollup will fold without preserving the folded commit's message or date
$ OLDHGEDITOR=$HGEDITOR
$ HGEDITOR=false
$ hg histedit 97d72e5f12c7 --commands - 2>&1 <<EOF | fixbundle
> pick 97d72e5f12c7 b
> roll 505a591af19e e
> pick 575228819b7e f
> pick c4d7f3def76d d
> EOF
$ HGEDITOR=$OLDHGEDITOR
log after edit
$ hg logt --graph
@ 3:bab801520cec d
|
o 2:58c8f2bfc151 f
|
o 1:5d939c56c72e b
|
o 0:8580ff50825a a
description is taken from rollup target commit
$ hg log --debug --rev 1
changeset: 1:5d939c56c72e77e29f5167696218e2131a40f5cf
phase: draft
parent: 0:8580ff50825a50c8f716709acdf8de0deddcd6ab
parent: -1:0000000000000000000000000000000000000000
manifest: 1:b5e112a3a8354e269b1524729f0918662d847c38
user: test
date: Thu Jan 01 00:00:02 1970 +0000
files+: b e
extra: branch=default
extra: histedit_source=97d72e5f12c7e84f85064aa72e5a297142c36ed9,505a591af19eed18f560af827b9e03d2076773dc
description:
b
check saving last-message.txt
$ cat > $TESTTMP/abortfolding.py <<EOF
> from mercurial import util
> def abortfolding(ui, repo, hooktype, **kwargs):
> ctx = repo[kwargs.get('node')]
> if set(ctx.files()) == {b'c', b'd', b'f'}:
> return True # abort folding commit only
> ui.warn(b'allow non-folding commit\\n')
> EOF
$ cat > .hg/hgrc <<EOF
> [hooks]
> pretxncommit.abortfolding = python:$TESTTMP/abortfolding.py:abortfolding
> EOF
$ cat > $TESTTMP/editor.sh << EOF
> echo "==== before editing"
> cat \$1
> echo "===="
> echo "check saving last-message.txt" >> \$1
> EOF
$ rm -f .hg/last-message.txt
$ hg status --rev '58c8f2bfc151^1::bab801520cec'
A c
A d
A f
$ HGEDITOR="sh $TESTTMP/editor.sh" hg histedit 58c8f2bfc151 --commands - 2>&1 <<EOF
> pick 58c8f2bfc151 f
> fold bab801520cec d
> EOF
allow non-folding commit
==== before editing
f
***
c
***
d
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 c
HG: added d
HG: added f
====
transaction abort!
rollback completed
abort: pretxncommit.abortfolding hook failed
[255]
$ cat .hg/last-message.txt
f
***
c
***
d
check saving last-message.txt
$ cd ..
$ rm -r r
folding preserves initial author but uses later date
----------------------------------------------------
$ initrepo
$ hg ci -d '7 0' --user "someone else" --amend --quiet
tip before edit
$ hg log --rev .
changeset: 5:10c36dd37515
tag: tip
user: someone else
date: Thu Jan 01 00:00:07 1970 +0000
summary: f
$ hg --config progress.debug=1 --debug \
> histedit 1ddb6c90f2ee --commands - 2>&1 <<EOF | \
> egrep 'editing|unresolved'
> pick 1ddb6c90f2ee e
> fold 10c36dd37515 f
> EOF
editing: pick 1ddb6c90f2ee 4 e 1/2 changes (50.00%)
editing: fold 10c36dd37515 5 f 2/2 changes (100.00%)
tip after edit, which should use the later date, from the second changeset
$ hg log --rev .
changeset: 4:e4f3ec5d0b40
tag: tip
user: test
date: Thu Jan 01 00:00:07 1970 +0000
summary: e
$ cd ..
$ rm -r r
folding and creating no new change doesn't break:
-------------------------------------------------
folded content is dropped during a merge. The folded commit should properly disappear.
$ mkdir fold-to-empty-test
$ cd fold-to-empty-test
$ hg init
$ printf "1\n2\n3\n" > file
$ hg add file
$ hg commit -m '1+2+3'
$ echo 4 >> file
$ hg commit -m '+4'
$ echo 5 >> file
$ hg commit -m '+5'
$ echo 6 >> file
$ hg commit -m '+6'
$ hg logt --graph
@ 3:251d831eeec5 +6
|
o 2:888f9082bf99 +5
|
o 1:617f94f13c0f +4
|
o 0:0189ba417d34 1+2+3
$ hg histedit 1 --commands - << EOF
> pick 617f94f13c0f 1 +4
> drop 888f9082bf99 2 +5
> fold 251d831eeec5 3 +6
> EOF
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
merging file
warning: conflicts while merging file! (edit, then use 'hg resolve --mark')
Fix up the change (fold 251d831eeec5)
(hg histedit --continue to resume)
[1]
There were conflicts, we keep P1 content. This
should effectively drop the changes from +6.
$ hg status -v
M file
? file.orig
# The repository is in an unfinished *histedit* state.
# Unresolved merge conflicts:
#
# file
#
# To mark files as resolved: hg resolve --mark FILE
# To continue: hg histedit --continue
# To abort: hg histedit --abort
$ hg resolve -l
U file
$ hg revert -r 'p1()' file
$ hg resolve --mark file
(no more unresolved files)
continue: hg histedit --continue
$ hg histedit --continue
251d831eeec5: empty changeset
saved backup bundle to $TESTTMP/fold-to-empty-test/.hg/strip-backup/888f9082bf99-daa0b8b3-histedit.hg
$ hg logt --graph
@ 1:617f94f13c0f +4
|
o 0:0189ba417d34 1+2+3
$ cd ..
Test fold through dropped
-------------------------
Test corner case where folded revision is separated from its parent by a
dropped revision.
$ hg init fold-with-dropped
$ cd fold-with-dropped
$ printf "1\n2\n3\n" > file
$ hg commit -Am '1+2+3'
adding file
$ echo 4 >> file
$ hg commit -m '+4'
$ echo 5 >> file
$ hg commit -m '+5'
$ echo 6 >> file
$ hg commit -m '+6'
$ hg logt -G
@ 3:251d831eeec5 +6
|
o 2:888f9082bf99 +5
|
o 1:617f94f13c0f +4
|
o 0:0189ba417d34 1+2+3
$ hg histedit 1 --commands - << EOF
> pick 617f94f13c0f 1 +4
> drop 888f9082bf99 2 +5
> fold 251d831eeec5 3 +6
> EOF
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
merging file
warning: conflicts while merging file! (edit, then use 'hg resolve --mark')
Fix up the change (fold 251d831eeec5)
(hg histedit --continue to resume)
[1]
$ cat > file << EOF
> 1
> 2
> 3
> 4
> 5
> EOF
$ hg resolve --mark file
(no more unresolved files)
continue: hg histedit --continue
$ hg commit -m '+5.2'
created new head
$ echo 6 >> file
$ HGEDITOR=cat hg histedit --continue
+4
***
+5.2
***
+6
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 file
saved backup bundle to $TESTTMP/fold-with-dropped/.hg/strip-backup/617f94f13c0f-3d69522c-histedit.hg
$ hg logt -G
@ 1:10c647b2cdd5 +4
|
o 0:0189ba417d34 1+2+3
$ hg export tip
# HG changeset patch
# User test
# Date 0 0
# Thu Jan 01 00:00:00 1970 +0000
# Node ID 10c647b2cdd54db0603ecb99b2ff5ce66d5a5323
# Parent 0189ba417d34df9dda55f88b637dcae9917b5964
+4
***
+5.2
***
+6
diff -r 0189ba417d34 -r 10c647b2cdd5 file
--- a/file Thu Jan 01 00:00:00 1970 +0000
+++ b/file Thu Jan 01 00:00:00 1970 +0000
@@ -1,3 +1,6 @@
1
2
3
+4
+5
+6
$ cd ..
Folding with initial rename (issue3729)
---------------------------------------
$ hg init fold-rename
$ cd fold-rename
$ echo a > a.txt
$ hg add a.txt
$ hg commit -m a
$ hg rename a.txt b.txt
$ hg commit -m rename
$ echo b >> b.txt
$ hg commit -m b
$ hg logt --follow b.txt
2:e0371e0426bc b
1:1c4f440a8085 rename
0:6c795aa153cb a
$ hg histedit 1c4f440a8085 --commands - 2>&1 << EOF | fixbundle
> pick 1c4f440a8085 rename
> fold e0371e0426bc b
> EOF
$ hg logt --follow b.txt
1:cf858d235c76 rename
0:6c795aa153cb a
$ cd ..
Folding with swapping
---------------------
This is an excuse to test hook with histedit temporary commit (issue4422)
$ hg init issue4422
$ cd issue4422
$ echo a > a.txt
$ hg add a.txt
$ hg commit -m a
$ echo b > b.txt
$ hg add b.txt
$ hg commit -m b
$ echo c > c.txt
$ hg add c.txt
$ hg commit -m c
$ hg logt
2:a1a953ffb4b0 c
1:199b6bb90248 b
0:6c795aa153cb a
$ hg histedit 6c795aa153cb --config hooks.commit='echo commit $HG_NODE' --config hooks.tonative.commit=True \
> --commands - 2>&1 << EOF | fixbundle
> pick 199b6bb90248 b
> fold a1a953ffb4b0 c
> pick 6c795aa153cb a
> EOF
commit 9599899f62c05f4377548c32bf1c9f1a39634b0c
$ hg logt
1:9599899f62c0 a
0:79b99e9c8e49 b
Test unix -> windows style variable substitution in external hooks.
$ cat > $TESTTMP/tmp.hgrc <<'EOF'
> [hooks]
> pre-add = echo no variables
> post-add = echo ran $HG_ARGS, literal \$non-var, 'also $non-var', $HG_RESULT
> tonative.post-add = True
> EOF
$ echo "foo" > amended.txt
$ HGRCPATH=$TESTTMP/tmp.hgrc hg add -v amended.txt
running hook pre-add: echo no variables
no variables
adding amended.txt
converting hook "post-add" to native (windows !)
running hook post-add: echo ran %HG_ARGS%, literal $non-var, "also $non-var", %HG_RESULT% (windows !)
running hook post-add: echo ran $HG_ARGS, literal \$non-var, 'also $non-var', $HG_RESULT (no-windows !)
ran add -v amended.txt, literal $non-var, "also $non-var", 0 (windows !)
ran add -v amended.txt, literal $non-var, also $non-var, 0 (no-windows !)
$ hg ci -q --config extensions.largefiles= --amend -I amended.txt
The fsmonitor extension is incompatible with the largefiles extension and has been disabled. (fsmonitor !)
Test that folding multiple changes in a row doesn't show multiple
editors.
$ echo foo >> foo
$ hg add foo
$ hg ci -m foo1
$ echo foo >> foo
$ hg ci -m foo2
$ echo foo >> foo
$ hg ci -m foo3
$ hg logt
4:21679ff7675c foo3
3:b7389cc4d66e foo2
2:0e01aeef5fa8 foo1
1:578c7455730c a
0:79b99e9c8e49 b
$ cat > "$TESTTMP/editor.sh" <<EOF
> echo ran editor >> "$TESTTMP/editorlog.txt"
> cat \$1 >> "$TESTTMP/editorlog.txt"
> echo END >> "$TESTTMP/editorlog.txt"
> echo merged foos > \$1
> EOF
$ HGEDITOR="sh \"$TESTTMP/editor.sh\"" hg histedit 1 --commands - 2>&1 <<EOF | fixbundle
> pick 578c7455730c 1 a
> pick 0e01aeef5fa8 2 foo1
> fold b7389cc4d66e 3 foo2
> fold 21679ff7675c 4 foo3
> EOF
$ hg logt
2:e8bedbda72c1 merged foos
1:578c7455730c a
0:79b99e9c8e49 b
Editor should have run only once
$ cat $TESTTMP/editorlog.txt
ran editor
foo1
***
foo2
***
foo3
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 foo
END
$ cd ..
Test rolling into a commit with multiple children (issue5498)
$ hg init roll
$ cd roll
$ echo a > a
$ hg commit -qAm aa
$ echo b > b
$ hg commit -qAm bb
$ hg up -q ".^"
$ echo c > c
$ hg commit -qAm cc
$ hg log -G -T '{node|short} {desc}'
@ 5db65b93a12b cc
|
| o 301d76bdc3ae bb
|/
o 8f0162e483d0 aa
$ hg histedit . --commands - << EOF
> r 5db65b93a12b
> EOF
hg: parse error: first changeset cannot use verb "roll"
[255]
$ hg log -G -T '{node|short} {desc}'
@ 5db65b93a12b cc
|
| o 301d76bdc3ae bb
|/
o 8f0162e483d0 aa