Mercurial > hg
view tests/test-commit.t @ 26623:5a95fe44121d
clonebundles: support for seeding clones from pre-generated bundles
Cloning can be an expensive operation for servers because the server
generates a bundle from existing repository data at request time. For
a large repository like mozilla-central, this consumes 4+ minutes
of CPU time on the server. It also results in significant network
utilization. Multiplied by hundreds or even thousands of clients and
the ensuing load can result in difficulties scaling the Mercurial server.
Despite generation of bundles being deterministic until the next
changeset is added, the generation of bundles to service a clone request
is not cached. Each clone thus performs redundant work. This is
wasteful.
This patch introduces the "clonebundles" extension and related
client-side functionality to help alleviate this deficiency. The
client-side feature is behind an experimental flag and is not enabled by
default.
It works as follows:
1) Server operator generates a bundle and makes it available on a
server (likely HTTP).
2) Server operator defines the URL of a bundle file in a
.hg/clonebundles.manifest file.
3) Client `hg clone`ing sees the server is advertising bundle URLs.
4) Client fetches and applies the advertised bundle.
5) Client performs equivalent of `hg pull` to fetch changes made since
the bundle was created.
Essentially, the server performs the expensive work of generating a
bundle once and all subsequent clones fetch a static file from
somewhere. Scaling static file serving is a much more manageable
problem than scaling a Python application like Mercurial. Assuming your
repository grows less than 1% per day, the end result is 99+% of CPU
and network load from clones is eliminated, allowing Mercurial servers
to scale more easily. Serving static files also means data can be
transferred to clients as fast as they can consume it, rather than as
fast as servers can generate it. This makes clones faster.
Mozilla has implemented similar functionality of this patch on
hg.mozilla.org using a custom extension. We are hosting bundle files in
Amazon S3 and CloudFront (a CDN) and have successfully offloaded
>1 TB/day in data transfer from hg.mozilla.org, freeing up significant
bandwidth and CPU resources. The positive impact has been stellar and
I believe it has proved its value to be included in Mercurial core. I
feel it is important for the client-side support to be enabled in core
by default because it means that clients will get faster, more reliable
clones and will enable server operators to reduce load without
requiring any client-side configuration changes (assuming clients are
up to date, of course).
The scope of this feature is narrowly and specifically tailored to
cloning, despite "serve pulls from pre-generated bundles" being a valid
and useful feature. I would eventually like for Mercurial servers to
support transferring *all* repository data via statically hosted files.
You could imagine a server that siphons all pushed data to bundle files
and instructs clients to apply a stream of bundles to reconstruct all
repository data. This feature, while useful and powerful, is
significantly more work to implement because it requires the server
component have awareness of discovery and a mapping of which changesets
are in which files. Full, clone bundles, by contrast, are much simpler.
The wire protocol command is named "clonebundles" instead of something
more generic like "staticbundles" to leave the door open for a new, more
powerful and more generic server-side component with minimal backwards
compatibility implications. The name "bundleclone" is used by Mozilla's
extension and would cause problems since there are subtle differences
in Mozilla's extension.
Mozilla's experience with this idea has taught us that some form of
"content negotiation" is required. Not all clients will support all
bundle formats or even URLs (advanced TLS requirements, etc). To ensure
the highest uptake possible, a server needs to advertise multiple
versions of bundles and clients need to be able to choose the most
appropriate from that list one. The "attributes" in each
server-advertised entry facilitate this filtering and sorting. Their
use will become apparent in subsequent patches.
Initial inspiration and credit for the idea of cloning from static files
belongs to Augie Fackler and his "lookaside clone" extension proof of
concept.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Fri, 09 Oct 2015 11:22:01 -0700 |
parents | 4b0fc75f9403 |
children | bec1a579ebc4 |
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commit date test $ hg init test $ cd test $ echo foo > foo $ hg add foo $ cat > $TESTTMP/checkeditform.sh <<EOF > env | grep HGEDITFORM > true > EOF $ HGEDITOR="sh $TESTTMP/checkeditform.sh" hg commit -m "" HGEDITFORM=commit.normal.normal abort: empty commit message [255] $ hg commit -d '0 0' -m commit-1 $ echo foo >> foo $ hg commit -d '1 4444444' -m commit-3 abort: impossible time zone offset: 4444444 [255] $ hg commit -d '1 15.1' -m commit-4 abort: invalid date: '1\t15.1' [255] $ hg commit -d 'foo bar' -m commit-5 abort: invalid date: 'foo bar' [255] $ hg commit -d ' 1 4444' -m commit-6 $ hg commit -d '111111111111 0' -m commit-7 abort: date exceeds 32 bits: 111111111111 [255] $ hg commit -d '-7654321 3600' -m commit-7 abort: negative date value: -7654321 [255] commit added file that has been deleted $ echo bar > bar $ hg add bar $ rm bar $ hg commit -m commit-8 nothing changed (1 missing files, see 'hg status') [1] $ hg commit -m commit-8-2 bar abort: bar: file not found! [255] $ hg -q revert -a --no-backup $ mkdir dir $ echo boo > dir/file $ hg add adding dir/file (glob) $ hg -v commit -m commit-9 dir committing files: dir/file committing manifest committing changelog committed changeset 2:d2a76177cb42 $ echo > dir.file $ hg add adding dir.file $ hg commit -m commit-10 dir dir.file abort: dir: no match under directory! [255] $ echo >> dir/file $ mkdir bleh $ mkdir dir2 $ cd bleh $ hg commit -m commit-11 . abort: bleh: no match under directory! [255] $ hg commit -m commit-12 ../dir ../dir2 abort: dir2: no match under directory! [255] $ hg -v commit -m commit-13 ../dir committing files: dir/file committing manifest committing changelog committed changeset 3:1cd62a2d8db5 $ cd .. $ hg commit -m commit-14 does-not-exist abort: does-not-exist: * (glob) [255] #if symlink $ ln -s foo baz $ hg commit -m commit-15 baz abort: baz: file not tracked! [255] #endif $ touch quux $ hg commit -m commit-16 quux abort: quux: file not tracked! [255] $ echo >> dir/file $ hg -v commit -m commit-17 dir/file committing files: dir/file committing manifest committing changelog committed changeset 4:49176991390e An empty date was interpreted as epoch origin $ echo foo >> foo $ hg commit -d '' -m commit-no-date $ hg tip --template '{date|isodate}\n' | grep '1970' [1] Make sure we do not obscure unknown requires file entries (issue2649) $ echo foo >> foo $ echo fake >> .hg/requires $ hg commit -m bla abort: repository requires features unknown to this Mercurial: fake! (see https://mercurial-scm.org/wiki/MissingRequirement for more information) [255] $ cd .. partial subdir commit test $ hg init test2 $ cd test2 $ mkdir foo $ echo foo > foo/foo $ mkdir bar $ echo bar > bar/bar $ hg add adding bar/bar (glob) adding foo/foo (glob) $ HGEDITOR=cat hg ci -e -m commit-subdir-1 foo commit-subdir-1 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/foo $ hg ci -m commit-subdir-2 bar subdir log 1 $ hg log -v foo changeset: 0:f97e73a25882 user: test date: Thu Jan 01 00:00:00 1970 +0000 files: foo/foo description: commit-subdir-1 subdir log 2 $ hg log -v bar changeset: 1:aa809156d50d tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 files: bar/bar description: commit-subdir-2 full log $ hg log -v changeset: 1:aa809156d50d tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 files: bar/bar description: commit-subdir-2 changeset: 0:f97e73a25882 user: test date: Thu Jan 01 00:00:00 1970 +0000 files: foo/foo description: commit-subdir-1 $ cd .. dot and subdir commit test $ hg init test3 $ echo commit-foo-subdir > commit-log-test $ cd test3 $ mkdir foo $ echo foo content > foo/plain-file $ hg add foo/plain-file $ HGEDITOR=cat hg ci --edit -l ../commit-log-test foo commit-foo-subdir 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/plain-file $ echo modified foo content > foo/plain-file $ hg ci -m commit-foo-dot . full log $ hg log -v changeset: 1:95b38e3a5b2e tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 files: foo/plain-file description: commit-foo-dot changeset: 0:65d4e9386227 user: test date: Thu Jan 01 00:00:00 1970 +0000 files: foo/plain-file description: commit-foo-subdir subdir log $ cd foo $ hg log . changeset: 1:95b38e3a5b2e tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: commit-foo-dot changeset: 0:65d4e9386227 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: commit-foo-subdir $ cd .. $ cd .. Issue1049: Hg permits partial commit of merge without warning $ hg init issue1049 $ cd issue1049 $ echo a > a $ hg ci -Ama adding a $ echo a >> a $ hg ci -mb $ hg up 0 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo b >> a $ hg ci -mc created new head $ HGMERGE=true hg merge merging a 0 files updated, 1 files merged, 0 files removed, 0 files unresolved (branch merge, don't forget to commit) should fail because we are specifying a file name $ hg ci -mmerge a abort: cannot partially commit a merge (do not specify files or patterns) [255] should fail because we are specifying a pattern $ hg ci -mmerge -I a abort: cannot partially commit a merge (do not specify files or patterns) [255] should succeed $ HGEDITOR="sh $TESTTMP/checkeditform.sh" hg ci -mmerge --edit HGEDITFORM=commit.normal.merge $ cd .. test commit message content $ hg init commitmsg $ cd commitmsg $ echo changed > changed $ echo removed > removed $ hg book activebookmark $ hg ci -qAm init $ hg rm removed $ echo changed >> changed $ echo added > added $ hg add added $ HGEDITOR=cat hg ci -A 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: bookmark 'activebookmark' HG: added added HG: changed changed HG: removed removed abort: empty commit message [255] test saving last-message.txt $ hg init sub $ echo a > sub/a $ hg -R sub add sub/a $ cat > sub/.hg/hgrc <<EOF > [hooks] > precommit.test-saving-last-message = false > EOF $ echo 'sub = sub' > .hgsub $ hg add .hgsub $ cat > $TESTTMP/editor.sh <<EOF > echo "==== before editing:" > cat \$1 > echo "====" > echo "test saving last-message.txt" >> \$1 > EOF $ rm -f .hg/last-message.txt $ HGEDITOR="sh $TESTTMP/editor.sh" hg commit -S -q ==== before editing: 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: bookmark 'activebookmark' HG: subrepo sub HG: added .hgsub HG: added added HG: changed .hgsubstate HG: changed changed HG: removed removed ==== abort: precommit.test-saving-last-message hook exited with status 1 (in subrepo sub) [255] $ cat .hg/last-message.txt test saving last-message.txt test that '[committemplate] changeset' definition and commit log specific template keywords work well $ cat >> .hg/hgrc <<EOF > [committemplate] > changeset.commit.normal = HG: this is "commit.normal" template > HG: {extramsg} > {if(activebookmark, > "HG: bookmark '{activebookmark}' is activated\n", > "HG: no bookmark is activated\n")}{subrepos % > "HG: subrepo '{subrepo}' is changed\n"} > > changeset.commit = HG: this is "commit" template > HG: {extramsg} > {if(activebookmark, > "HG: bookmark '{activebookmark}' is activated\n", > "HG: no bookmark is activated\n")}{subrepos % > "HG: subrepo '{subrepo}' is changed\n"} > > changeset = HG: this is customized commit template > HG: {extramsg} > {if(activebookmark, > "HG: bookmark '{activebookmark}' is activated\n", > "HG: no bookmark is activated\n")}{subrepos % > "HG: subrepo '{subrepo}' is changed\n"} > EOF $ hg init sub2 $ echo a > sub2/a $ hg -R sub2 add sub2/a $ echo 'sub2 = sub2' >> .hgsub $ HGEDITOR=cat hg commit -S -q HG: this is "commit.normal" template HG: Leave message empty to abort commit. HG: bookmark 'activebookmark' is activated HG: subrepo 'sub' is changed HG: subrepo 'sub2' is changed abort: empty commit message [255] $ cat >> .hg/hgrc <<EOF > [committemplate] > changeset.commit.normal = > # now, "changeset.commit" should be chosen for "hg commit" > EOF $ hg bookmark --inactive activebookmark $ hg forget .hgsub $ HGEDITOR=cat hg commit -q HG: this is "commit" template HG: Leave message empty to abort commit. HG: no bookmark is activated abort: empty commit message [255] $ cat >> .hg/hgrc <<EOF > [committemplate] > changeset.commit = > # now, "changeset" should be chosen for "hg commit" > EOF $ HGEDITOR=cat hg commit -q HG: this is customized commit template HG: Leave message empty to abort commit. HG: no bookmark is activated abort: empty commit message [255] $ cat >> .hg/hgrc <<EOF > [committemplate] > changeset = {desc} > HG: mods={file_mods} > HG: adds={file_adds} > HG: dels={file_dels} > HG: files={files} > HG: > {splitlines(diff()) % 'HG: {line}\n' > }HG: > HG: mods={file_mods} > HG: adds={file_adds} > HG: dels={file_dels} > HG: files={files}\n > EOF $ hg status -amr M changed A added R removed $ HGEDITOR=cat hg commit -q -e -m "foo bar" changed foo bar HG: mods=changed HG: adds= HG: dels= HG: files=changed HG: HG: --- a/changed Thu Jan 01 00:00:00 1970 +0000 HG: +++ b/changed Thu Jan 01 00:00:00 1970 +0000 HG: @@ -1,1 +1,2 @@ HG: changed HG: +changed HG: HG: mods=changed HG: adds= HG: dels= HG: files=changed $ hg status -amr A added R removed $ hg parents --template "M {file_mods}\nA {file_adds}\nR {file_dels}\n" M changed A R $ hg rollback -q $ cat >> .hg/hgrc <<EOF > [committemplate] > changeset = {desc} > HG: mods={file_mods} > HG: adds={file_adds} > HG: dels={file_dels} > HG: files={files} > HG: > {splitlines(diff("changed")) % 'HG: {line}\n' > }HG: > HG: mods={file_mods} > HG: adds={file_adds} > HG: dels={file_dels} > HG: files={files} > HG: > {splitlines(diff("added")) % 'HG: {line}\n' > }HG: > HG: mods={file_mods} > HG: adds={file_adds} > HG: dels={file_dels} > HG: files={files} > HG: > {splitlines(diff("removed")) % 'HG: {line}\n' > }HG: > HG: mods={file_mods} > HG: adds={file_adds} > HG: dels={file_dels} > HG: files={files}\n > EOF $ HGEDITOR=cat hg commit -q -e -m "foo bar" added removed foo bar HG: mods= HG: adds=added HG: dels=removed HG: files=added removed HG: HG: HG: mods= HG: adds=added HG: dels=removed HG: files=added removed HG: HG: --- /dev/null Thu Jan 01 00:00:00 1970 +0000 HG: +++ b/added Thu Jan 01 00:00:00 1970 +0000 HG: @@ -0,0 +1,1 @@ HG: +added HG: HG: mods= HG: adds=added HG: dels=removed HG: files=added removed HG: HG: --- a/removed Thu Jan 01 00:00:00 1970 +0000 HG: +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 HG: @@ -1,1 +0,0 @@ HG: -removed HG: HG: mods= HG: adds=added HG: dels=removed HG: files=added removed $ hg status -amr M changed $ hg parents --template "M {file_mods}\nA {file_adds}\nR {file_dels}\n" M A added R removed $ hg rollback -q $ cat >> .hg/hgrc <<EOF > # disable customizing for subsequent tests > [committemplate] > changeset = > EOF $ cd .. commit copy $ hg init dir2 $ cd dir2 $ echo bleh > bar $ hg add bar $ hg ci -m 'add bar' $ hg cp bar foo $ echo >> bar $ hg ci -m 'cp bar foo; change bar' $ hg debugrename foo foo renamed from bar:26d3ca0dfd18e44d796b564e38dd173c9668d3a9 $ hg debugindex bar rev offset length ..... linkrev nodeid p1 p2 (re) 0 0 6 ..... 0 26d3ca0dfd18 000000000000 000000000000 (re) 1 6 7 ..... 1 d267bddd54f7 26d3ca0dfd18 000000000000 (re) Test making empty commits $ hg commit --config ui.allowemptycommit=True -m "empty commit" $ hg log -r . -v --stat changeset: 2:d809f3644287 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 description: empty commit verify pathauditor blocks evil filepaths $ cat > evil-commit.py <<EOF > from mercurial import ui, hg, context, node > notrc = u".h\u200cg".encode('utf-8') + '/hgrc' > u = ui.ui() > r = hg.repository(u, '.') > def filectxfn(repo, memctx, path): > return context.memfilectx(repo, path, '[hooks]\nupdate = echo owned') > c = context.memctx(r, [r['tip'].node(), node.nullid], > 'evil', [notrc], filectxfn, 0) > r.commitctx(c) > EOF $ $PYTHON evil-commit.py #if windows $ hg co --clean tip abort: path contains illegal component: .h\xe2\x80\x8cg\\hgrc (esc) [255] #else $ hg co --clean tip abort: path contains illegal component: .h\xe2\x80\x8cg/hgrc (esc) [255] #endif $ hg rollback -f repository tip rolled back to revision 2 (undo commit) $ cat > evil-commit.py <<EOF > from mercurial import ui, hg, context, node > notrc = "HG~1/hgrc" > u = ui.ui() > r = hg.repository(u, '.') > def filectxfn(repo, memctx, path): > return context.memfilectx(repo, path, '[hooks]\nupdate = echo owned') > c = context.memctx(r, [r['tip'].node(), node.nullid], > 'evil', [notrc], filectxfn, 0) > r.commitctx(c) > EOF $ $PYTHON evil-commit.py $ hg co --clean tip abort: path contains illegal component: HG~1/hgrc (glob) [255] $ hg rollback -f repository tip rolled back to revision 2 (undo commit) $ cat > evil-commit.py <<EOF > from mercurial import ui, hg, context, node > notrc = "HG8B6C~2/hgrc" > u = ui.ui() > r = hg.repository(u, '.') > def filectxfn(repo, memctx, path): > return context.memfilectx(repo, path, '[hooks]\nupdate = echo owned') > c = context.memctx(r, [r['tip'].node(), node.nullid], > 'evil', [notrc], filectxfn, 0) > r.commitctx(c) > EOF $ $PYTHON evil-commit.py $ hg co --clean tip abort: path contains illegal component: HG8B6C~2/hgrc (glob) [255]