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wireprotov2: define and implement "manifestdata" command...
wireprotov2: define and implement "manifestdata" command The added command can be used for obtaining manifest data. Given a manifest path and set of manifest nodes, data about manifests can be retrieved. Unlike changeset data, we wish to emit deltas to describe manifest revisions. So the command uses the relatively new API for building delta requests and emitting them. The code calls into deltaparent(), which I'm not very keen of. There's still work to be done in delta generation land so implementation details of storage (e.g. exactly one delta is stored/available) don't creep into higher levels. But we can worry about this later (there is already a TODO on imanifestorage tracking this). On the subject of parent deltas, the server assumes parent revisions exist on the receiving end. This is obviously wrong for shallow clone. I've added TODOs to add a mechanism to the command to allow clients to specify desired behavior. This shouldn't be too difficult to implement. Another big change is that the client must explicitly request manifest nodes to retrieve. This is a major departure from "getbundle," where the server derives relevant manifests as it iterates changesets and sends them automatically. As implemented, the client must transmit each requested node to the server. At 20 bytes per node, we're looking at 2 MB per 100,000 nodes. Plus wire encoding overhead. This isn't ideal for clients with limited upload bandwidth. I plan to address this in the future by allowing alternate mechanisms for defining the revisions to retrieve. One idea is to define a range of changeset revisions whose manifest revisions to retrieve (similar to how "changesetdata" works). We almost certainly want an API to look up an individual manifest by node. And that's where I've chosen to start with the implementation. Again, a theme of this early exchangev2 work is I want to start by building primitives for accessing raw repository data first and see how far we can get with those before we need more complexity. Differential Revision: https://phab.mercurial-scm.org/D4488
Boris Feld - - Load All Authors

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test-pull-bundle.t
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#require no-chg
$ hg init repo
$ cd repo
$ echo foo > foo
$ hg ci -qAm 'add foo'
$ echo >> foo
$ hg ci -m 'change foo'
$ hg up -qC 0
$ echo bar > bar
$ hg ci -qAm 'add bar'
$ hg log
changeset: 2:effea6de0384
tag: tip
parent: 0:bbd179dfa0a7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add bar
changeset: 1:ed1b79f46b9a
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: change foo
changeset: 0:bbd179dfa0a7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add foo
$ cd ..
Test pullbundle functionality
$ cd repo
$ cat <<EOF > .hg/hgrc
> [server]
> pullbundle = True
> [extensions]
> blackbox =
> EOF
$ hg bundle --base null -r 0 .hg/0.hg
1 changesets found
$ hg bundle --base 0 -r 1 .hg/1.hg
1 changesets found
$ hg bundle --base 1 -r 2 .hg/2.hg
1 changesets found
$ cat <<EOF > .hg/pullbundles.manifest
> 2.hg BUNDLESPEC=none-v2 heads=effea6de0384e684f44435651cb7bd70b8735bd4 bases=bbd179dfa0a71671c253b3ae0aa1513b60d199fa
> 1.hg BUNDLESPEC=bzip2-v2 heads=ed1b79f46b9a29f5a6efa59cf12fcfca43bead5a bases=bbd179dfa0a71671c253b3ae0aa1513b60d199fa
> 0.hg BUNDLESPEC=gzip-v2 heads=bbd179dfa0a71671c253b3ae0aa1513b60d199fa
> EOF
$ hg --config blackbox.track=debug --debug serve -p $HGPORT2 -d --pid-file=../repo.pid
listening at http://*:$HGPORT2/ (bound to $LOCALIP:$HGPORT2) (glob) (?)
$ cat ../repo.pid >> $DAEMON_PIDS
$ cd ..
$ hg clone -r 0 http://localhost:$HGPORT2/ repo.pullbundle
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
new changesets bbd179dfa0a7 (1 drafts)
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd repo.pullbundle
$ hg pull -r 1
pulling from http://localhost:$HGPORT2/
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
new changesets ed1b79f46b9a (1 drafts)
(run 'hg update' to get a working copy)
$ hg pull -r 2
pulling from http://localhost:$HGPORT2/
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files (+1 heads)
new changesets effea6de0384 (1 drafts)
(run 'hg heads' to see heads, 'hg merge' to merge)
$ cd ..
$ killdaemons.py
$ grep 'sending pullbundle ' repo/.hg/blackbox.log
* sending pullbundle "0.hg" (glob)
* sending pullbundle "1.hg" (glob)
* sending pullbundle "2.hg" (glob)
$ rm repo/.hg/blackbox.log
Test pullbundle functionality for incremental pulls
$ cd repo
$ hg --config blackbox.track=debug --debug serve -p $HGPORT2 -d --pid-file=../repo.pid
listening at http://*:$HGPORT2/ (bound to $LOCALIP:$HGPORT2) (glob) (?)
$ cat ../repo.pid >> $DAEMON_PIDS
$ cd ..
$ hg clone http://localhost:$HGPORT2/ repo.pullbundle2
requesting all changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files (+1 heads)
new changesets bbd179dfa0a7:ed1b79f46b9a (3 drafts)
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ killdaemons.py
$ grep 'sending pullbundle ' repo/.hg/blackbox.log
* sending pullbundle "0.hg" (glob)
* sending pullbundle "2.hg" (glob)
* sending pullbundle "1.hg" (glob)
$ rm repo/.hg/blackbox.log
Test recovery from misconfigured server sending no new data
$ cd repo
$ cat <<EOF > .hg/pullbundles.manifest
> 0.hg heads=ed1b79f46b9a29f5a6efa59cf12fcfca43bead5a bases=bbd179dfa0a71671c253b3ae0aa1513b60d199fa
> 0.hg heads=bbd179dfa0a71671c253b3ae0aa1513b60d199fa
> EOF
$ hg --config blackbox.track=debug --debug serve -p $HGPORT2 -d --pid-file=../repo.pid
listening at http://*:$HGPORT2/ (bound to $LOCALIP:$HGPORT2) (glob) (?)
$ cat ../repo.pid >> $DAEMON_PIDS
$ cd ..
$ hg clone -r 0 http://localhost:$HGPORT2/ repo.pullbundle3
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
new changesets bbd179dfa0a7 (1 drafts)
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd repo.pullbundle3
$ hg pull -r 1
pulling from http://localhost:$HGPORT2/
searching for changes
adding changesets
adding manifests
adding file changes
added 0 changesets with 0 changes to 1 files
abort: 00changelog.i@ed1b79f46b9a: no node!
[255]
$ cd ..
$ killdaemons.py
$ grep 'sending pullbundle ' repo/.hg/blackbox.log
* sending pullbundle "0.hg" (glob)
* sending pullbundle "0.hg" (glob)
$ rm repo/.hg/blackbox.log