cborutil: implement support for streaming encoding, bytestring decoding
The vendored cbor2 package is... a bit disappointing.
On the encoding side, it insists that you pass it something with
a write() to send data to. That means if you want to emit data to
a generator, you have to construct an e.g. io.BytesIO(), write()
to it, then get the data back out. There can be non-trivial overhead
involved.
The encoder also doesn't support indefinite types - bytestrings, arrays,
and maps that don't have a known length. Again, this is really
unfortunate because it requires you to buffer the entire source and
destination in memory to encode large things.
On the decoding side, it supports reading indefinite length types.
But it buffers them completely before returning. More sadness.
This commit implements "streaming" encoders for various CBOR types.
Encoding emits a generator of hunks. So you can efficiently stream
encoded data elsewhere.
It also implements support for emitting indefinite length bytestrings,
arrays, and maps.
On the decoding side, we only implement support for decoding an
indefinite length bytestring from a file object. It will emit a
generator of raw chunks from the source.
I didn't want to reinvent so many wheels. But profiling the wire
protocol revealed that the overhead of constructing io.BytesIO()
instances to temporarily hold results has a non-trivial overhead.
We're talking >15% of execution time for operations like
"transfer the fulltexts of all files in a revision." So I can
justify this effort.
Fortunately, CBOR is a relatively straightforward format. And we have
a reference implementation in the repo we can test against.
Differential Revision: https://phab.mercurial-scm.org/D3303
$ cat <<EOF > merge
> from __future__ import print_function
> import sys, os
>
> try:
> import msvcrt
> msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
> msvcrt.setmode(sys.stderr.fileno(), os.O_BINARY)
> except ImportError:
> pass
>
> print("merging for", os.path.basename(sys.argv[1]))
> EOF
$ HGMERGE="$PYTHON ../merge"; export HGMERGE
$ hg init t
$ cd t
$ echo This is file a1 > a
$ hg add a
$ hg commit -m "commit #0"
$ echo This is file b1 > b
$ hg add b
$ hg commit -m "commit #1"
$ hg update 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
Test interrupted updates by having a non-empty dir with the same name as one
of the files in a commit we're updating to
$ mkdir b && touch b/nonempty
$ hg up
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg ci
nothing changed
[1]
$ hg sum
parent: 1:b8bb4a988f25 tip
commit #1
branch: default
commit: (clean)
update: (current)
phases: 2 draft
The following line is commented out because the file doesn't exist at the moment, and some OSes error out even with `rm -f`.
$ rm b/nonempty
$ hg up
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg sum
parent: 1:b8bb4a988f25 tip
commit #1
branch: default
commit: (clean)
update: (current)
phases: 2 draft
Prepare a basic merge
$ hg up 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo This is file c1 > c
$ hg add c
$ hg commit -m "commit #2"
created new head
$ echo This is file b1 > b
no merges expected
$ hg merge -P 1
changeset: 1:b8bb4a988f25
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: commit #1
$ hg merge 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg diff --nodates
diff -r 49035e18a8e6 b
--- /dev/null
+++ b/b
@@ -0,0 +1,1 @@
+This is file b1
$ hg status
M b
$ cd ..; rm -r t
$ hg init t
$ cd t
$ echo This is file a1 > a
$ hg add a
$ hg commit -m "commit #0"
$ echo This is file b1 > b
$ hg add b
$ hg commit -m "commit #1"
$ hg update 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo This is file c1 > c
$ hg add c
$ hg commit -m "commit #2"
created new head
$ echo This is file b2 > b
merge should fail
$ hg merge 1
b: untracked file differs
abort: untracked files in working directory differ from files in requested revision
[255]
#if symlink
symlinks to directories should be treated as regular files (issue5027)
$ rm b
$ ln -s 'This is file b2' b
$ hg merge 1
b: untracked file differs
abort: untracked files in working directory differ from files in requested revision
[255]
symlinks shouldn't be followed
$ rm b
$ echo This is file b1 > .hg/b
$ ln -s .hg/b b
$ hg merge 1
b: untracked file differs
abort: untracked files in working directory differ from files in requested revision
[255]
$ rm b
$ echo This is file b2 > b
#endif
bad config
$ hg merge 1 --config merge.checkunknown=x
abort: merge.checkunknown not valid ('x' is none of 'abort', 'ignore', 'warn')
[255]
this merge should fail
$ hg merge 1 --config merge.checkunknown=abort
b: untracked file differs
abort: untracked files in working directory differ from files in requested revision
[255]
this merge should warn
$ hg merge 1 --config merge.checkunknown=warn
b: replacing untracked file
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ cat b.orig
This is file b2
$ hg up --clean 2
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ mv b.orig b
this merge should silently ignore
$ cat b
This is file b2
$ hg merge 1 --config merge.checkunknown=ignore
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
merge.checkignored
$ hg up --clean 1
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ cat >> .hgignore << EOF
> remoteignored
> EOF
$ echo This is file localignored3 > localignored
$ echo This is file remoteignored3 > remoteignored
$ hg add .hgignore localignored remoteignored
$ hg commit -m "commit #3"
$ hg up 2
1 files updated, 0 files merged, 4 files removed, 0 files unresolved
$ cat >> .hgignore << EOF
> localignored
> EOF
$ hg add .hgignore
$ hg commit -m "commit #4"
remote .hgignore shouldn't be used for determining whether a file is ignored
$ echo This is file remoteignored4 > remoteignored
$ hg merge 3 --config merge.checkignored=ignore --config merge.checkunknown=abort
remoteignored: untracked file differs
abort: untracked files in working directory differ from files in requested revision
[255]
$ hg merge 3 --config merge.checkignored=abort --config merge.checkunknown=ignore
merging .hgignore
merging for .hgignore
3 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ cat remoteignored
This is file remoteignored3
$ cat remoteignored.orig
This is file remoteignored4
$ rm remoteignored.orig
local .hgignore should be used for that
$ hg up --clean 4
1 files updated, 0 files merged, 3 files removed, 0 files unresolved
$ echo This is file localignored4 > localignored
also test other conflicting files to see we output the full set of warnings
$ echo This is file b2 > b
$ hg merge 3 --config merge.checkignored=abort --config merge.checkunknown=abort
b: untracked file differs
localignored: untracked file differs
abort: untracked files in working directory differ from files in requested revision
[255]
$ hg merge 3 --config merge.checkignored=abort --config merge.checkunknown=ignore
localignored: untracked file differs
abort: untracked files in working directory differ from files in requested revision
[255]
$ hg merge 3 --config merge.checkignored=warn --config merge.checkunknown=abort
b: untracked file differs
abort: untracked files in working directory differ from files in requested revision
[255]
$ hg merge 3 --config merge.checkignored=warn --config merge.checkunknown=warn
b: replacing untracked file
localignored: replacing untracked file
merging .hgignore
merging for .hgignore
3 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ cat localignored
This is file localignored3
$ cat localignored.orig
This is file localignored4
$ rm localignored.orig
$ cat b.orig
This is file b2
$ hg up --clean 2
0 files updated, 0 files merged, 4 files removed, 0 files unresolved
$ mv b.orig b
this merge of b should work
$ cat b
This is file b2
$ hg merge -f 1
merging b
merging for b
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg diff --nodates
diff -r 49035e18a8e6 b
--- /dev/null
+++ b/b
@@ -0,0 +1,1 @@
+This is file b2
$ hg status
M b
$ cd ..; rm -r t
$ hg init t
$ cd t
$ echo This is file a1 > a
$ hg add a
$ hg commit -m "commit #0"
$ echo This is file b1 > b
$ hg add b
$ hg commit -m "commit #1"
$ echo This is file b22 > b
$ hg commit -m "commit #2"
$ hg update 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo This is file c1 > c
$ hg add c
$ hg commit -m "commit #3"
created new head
Contents of b should be "this is file b1"
$ cat b
This is file b1
$ echo This is file b22 > b
merge fails
$ hg merge 2
abort: uncommitted changes
(use 'hg status' to list changes)
[255]
merge expected!
$ hg merge -f 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg diff --nodates
diff -r 85de557015a8 b
--- a/b
+++ b/b
@@ -1,1 +1,1 @@
-This is file b1
+This is file b22
$ hg status
M b
$ cd ..; rm -r t
$ hg init t
$ cd t
$ echo This is file a1 > a
$ hg add a
$ hg commit -m "commit #0"
$ echo This is file b1 > b
$ hg add b
$ hg commit -m "commit #1"
$ echo This is file b22 > b
$ hg commit -m "commit #2"
$ hg update 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo This is file c1 > c
$ hg add c
$ hg commit -m "commit #3"
created new head
$ echo This is file b33 > b
merge of b should fail
$ hg merge 2
abort: uncommitted changes
(use 'hg status' to list changes)
[255]
merge of b expected
$ hg merge -f 2
merging b
merging for b
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg diff --nodates
diff -r 85de557015a8 b
--- a/b
+++ b/b
@@ -1,1 +1,1 @@
-This is file b1
+This is file b33
$ hg status
M b
Test for issue2364
$ hg up -qC .
$ hg rm b
$ hg ci -md
$ hg revert -r -2 b
$ hg up -q -- -2
Test that updated files are treated as "modified", when
'merge.update()' is aborted before 'merge.recordupdates()' (= parents
aren't changed), even if none of mode, size and timestamp of them
isn't changed on the filesystem (see also issue4583).
$ cat > $TESTTMP/abort.py <<EOF
> from __future__ import absolute_import
> # emulate aborting before "recordupdates()". in this case, files
> # are changed without updating dirstate
> from mercurial import (
> error,
> extensions,
> merge,
> )
> def applyupdates(orig, *args, **kwargs):
> orig(*args, **kwargs)
> raise error.Abort('intentional aborting')
> def extsetup(ui):
> extensions.wrapfunction(merge, "applyupdates", applyupdates)
> EOF
$ cat >> .hg/hgrc <<EOF
> [fakedirstatewritetime]
> # emulate invoking dirstate.write() via repo.status()
> # at 2000-01-01 00:00
> fakenow = 200001010000
> EOF
(file gotten from other revision)
$ hg update -q -C 2
$ echo 'THIS IS FILE B5' > b
$ hg commit -m 'commit #5'
$ hg update -q -C 3
$ cat b
This is file b1
$ touch -t 200001010000 b
$ hg debugrebuildstate
$ cat >> .hg/hgrc <<EOF
> [extensions]
> fakedirstatewritetime = $TESTDIR/fakedirstatewritetime.py
> abort = $TESTTMP/abort.py
> EOF
$ hg merge 5
abort: intentional aborting
[255]
$ cat >> .hg/hgrc <<EOF
> [extensions]
> fakedirstatewritetime = !
> abort = !
> EOF
$ cat b
THIS IS FILE B5
$ touch -t 200001010000 b
$ hg status -A b
M b
(file merged from other revision)
$ hg update -q -C 3
$ echo 'this is file b6' > b
$ hg commit -m 'commit #6'
created new head
$ cat b
this is file b6
$ touch -t 200001010000 b
$ hg debugrebuildstate
$ cat >> .hg/hgrc <<EOF
> [extensions]
> fakedirstatewritetime = $TESTDIR/fakedirstatewritetime.py
> abort = $TESTTMP/abort.py
> EOF
$ hg merge --tool internal:other 5
abort: intentional aborting
[255]
$ cat >> .hg/hgrc <<EOF
> [extensions]
> fakedirstatewritetime = !
> abort = !
> EOF
$ cat b
THIS IS FILE B5
$ touch -t 200001010000 b
$ hg status -A b
M b
$ cd ..