commands: config option to control bundle compression level
Currently, bundle compression uses the default compression level
for the active compression engine. The default compression level
is tuned as a compromise between speed and size.
Some scenarios may call for a different compression level. For
example, with clone bundles, bundles are generated once and used
several times. Since the cost to generate is paid infrequently,
server operators may wish to trade extra CPU time for better
compression ratios.
This patch introduces an experimental and undocumented config
option to control the bundle compression level. As the inline
comment says, this approach is a bit hacky. I'd prefer for
the compression level to be encoded in the bundle spec. e.g.
"zstd-v2;complevel=15." However, given that the 4.1 freeze is
imminent, I'm not comfortable implementing this user-facing
change without much time to test and consider the implications.
So, we're going with the quick and dirty solution for now.
Having this option in the 4.1 release will enable Mozilla to
easily produce and test zlib and zstd bundles with non-default
compression levels in production. This will help drive future
development of the feature and zstd integration with Mercurial.
#require baz symlink
$ baz my-id "mercurial <mercurial@selenic.com>"
$ echo "[extensions]" >> $HGRCPATH
$ echo "convert=" >> $HGRCPATH
create baz archive
$ baz make-archive baz@mercurial--convert hg-test-convert-baz
initialize baz repo
$ mkdir baz-repo
$ cd baz-repo/
$ baz init-tree baz@mercurial--convert/baz--test--0
$ baz import
* creating version baz@mercurial--convert/baz--test--0
* imported baz@mercurial--convert/baz--test--0
create initial files
$ echo 'this is a file' > a
$ baz add a
$ mkdir src
$ baz add src
$ cd src
$ dd count=1 if=/dev/zero of=b > /dev/null 2> /dev/null
$ baz add b
HACK: hide GNU tar-1.22 "tar: The --preserve option is deprecated, use --preserve-permissions --preserve-order instead"
$ baz commit -s "added a file, src and src/b (binary)" 2>&1 | grep -v '^tar'
* build pristine tree for baz@mercurial--convert/baz--test--0--base-0
* Scanning for full-tree revision: .
* from import revision: baz@mercurial--convert/baz--test--0--base-0
A/ .arch-ids
A/ src
A/ src/.arch-ids
A .arch-ids/a.id
A a
A src/.arch-ids/=id
A src/.arch-ids/b.id
A src/b
* update pristine tree (baz@mercurial--convert/baz--test--0--base-0 => baz--test--0--patch-1)
* committed baz@mercurial--convert/baz--test--0--patch-1
create link file and modify a
$ ln -s ../a a-link
$ baz add a-link
$ echo 'this a modification to a' >> ../a
$ baz commit -s "added link to a and modify a"
A src/.arch-ids/a-link.id
A src/a-link
M a
* update pristine tree (baz@mercurial--convert/baz--test--0--patch-1 => baz--test--0--patch-2)
* committed baz@mercurial--convert/baz--test--0--patch-2
create second link and modify b
$ ln -s ../a a-link-2
$ baz add a-link-2
$ dd count=1 seek=1 if=/dev/zero of=b > /dev/null 2> /dev/null
$ baz commit -s "added second link and modify b"
A src/.arch-ids/a-link-2.id
A src/a-link-2
Mb src/b
* update pristine tree (baz@mercurial--convert/baz--test--0--patch-2 => baz--test--0--patch-3)
* committed baz@mercurial--convert/baz--test--0--patch-3
b file to link and a-link-2 to regular file
$ rm -f a-link-2
$ echo 'this is now a regular file' > a-link-2
$ ln -sf ../a b
$ baz commit -s "file to link and link to file test"
fl src/b
lf src/a-link-2
* update pristine tree (baz@mercurial--convert/baz--test--0--patch-3 => baz--test--0--patch-4)
* committed baz@mercurial--convert/baz--test--0--patch-4
move a-link-2 file and src directory
$ cd ..
$ baz mv src/a-link-2 c
$ baz mv src test
$ baz commit -s "move and rename a-link-2 file and src directory"
D/ src/.arch-ids
A/ test/.arch-ids
/> src test
=> src/.arch-ids/a-link-2.id .arch-ids/c.id
=> src/a-link-2 c
=> src/.arch-ids/=id test/.arch-ids/=id
=> src/.arch-ids/a-link.id test/.arch-ids/a-link.id
=> src/.arch-ids/b.id test/.arch-ids/b.id
* update pristine tree (baz@mercurial--convert/baz--test--0--patch-4 => baz--test--0--patch-5)
* committed baz@mercurial--convert/baz--test--0--patch-5
move and add the moved file again
$ echo e > e
$ baz add e
$ baz commit -s "add e"
A .arch-ids/e.id
A e
* update pristine tree (baz@mercurial--convert/baz--test--0--patch-5 => baz--test--0--patch-6)
* committed baz@mercurial--convert/baz--test--0--patch-6
$ baz mv e f
$ echo ee > e
$ baz add e
$ baz commit -s "move e and recreate it again"
A .arch-ids/e.id
A e
=> .arch-ids/e.id .arch-ids/f.id
=> e f
* update pristine tree (baz@mercurial--convert/baz--test--0--patch-6 => baz--test--0--patch-7)
* committed baz@mercurial--convert/baz--test--0--patch-7
$ cd ..
converting baz repo to Mercurial
$ hg convert baz-repo baz-repo-hg
initializing destination baz-repo-hg repository
analyzing tree version baz@mercurial--convert/baz--test--0...
scanning source...
sorting...
converting...
7 initial import
6 added a file, src and src/b (binary)
5 added link to a and modify a
4 added second link and modify b
3 file to link and link to file test
2 move and rename a-link-2 file and src directory
1 add e
0 move e and recreate it again
$ baz register-archive -d baz@mercurial--convert
$ glog()
> {
> hg log -G --template '{rev} "{desc|firstline}" files: {files}\n' "$@"
> }
show graph log
$ glog -R baz-repo-hg
o 7 "move e and recreate it again" files: e f
|
o 6 "add e" files: e
|
o 5 "move and rename a-link-2 file and src directory" files: c src/a-link src/a-link-2 src/b test/a-link test/b
|
o 4 "file to link and link to file test" files: src/a-link-2 src/b
|
o 3 "added second link and modify b" files: src/a-link-2 src/b
|
o 2 "added link to a and modify a" files: a src/a-link
|
o 1 "added a file, src and src/b (binary)" files: a src/b
|
o 0 "initial import" files:
$ hg up -q -R baz-repo-hg
$ hg -R baz-repo-hg manifest --debug
c4072c4b72e1cabace081888efa148ee80ca3cbb 644 a
0201ac32a3a8e86e303dff60366382a54b48a72e 644 c
1a4a864db0073705a11b1439f563bfa4b46d9246 644 e
09e0222742fc3f75777fa9d68a5d8af7294cb5e7 644 f
c0067ba5ff0b7c9a3eb17270839d04614c435623 644 @ test/a-link
375f4263d86feacdea7e3c27100abd1560f2a973 644 @ test/b
$ hg -R baz-repo-hg log -r 5 -r 7 -C --debug | grep copies
copies: c (src/a-link-2) test/a-link (src/a-link) test/b (src/b)
copies: f (e)