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view tests/test-patchbomb-bookmark.t @ 40393:229d23cdb203
exchangev2: support fetching shallow files history
This commit teaches the exchangev2 client code to handle fetching shallow
files data.
Only shallow fetching of files data is supported: shallow fetching of
changeset and manifest data is explicitly not yet supported.
Previously, we would fetch file revisions for changesets that were received
by the current pull operation. In the new model, we calculate the set of
"relevant" changesets given the pull depth and only fetch files data for
those changesets.
We also teach the "filesdata" command invocation to vary parameters as needed.
The implementation here is far from complete or optimal. Subsequent pulls will
end up re-fetching a lot of files data. But the application of this data should
mostly be a no-op on the client, so it isn't a big deal.
Depending on the order file revisions are fetched in, revisions could get
inserted with the wrong revision number relationships. I think the best way
to deal with this is to remove revision numbers from storage and to either
dynamically derive them (by reconstructing a DAG from nodes/parents) or remove
revision numbers from the file storage interface completely.
A missing API that we'll likely want to write pretty soon is "ensure files
for revision(s) are present." We can kind of cajole exchangev2.pull() to do
this. But it isn't very efficient. For example, in simple cases like
widening the store to obtain data for a single revision, it is probably
more efficient to walk the manifest and find exactly which file revisions
are missing and to make explicit requests for just their data. In more
advanced cases, asking the server for all files data may be more efficient,
even though it requires sending data the client already has. There is tons
of room for future experimentation here. And TBH I'm not sure what the
final state will be.
Anyway, this commit gets us pretty close to being able to have shallow
and narrow checkouts with exchangev2/sqlite storage. Close enough that a
minimal extension should be able to provide fill in the gaps until the code
in core stabilizes and there is a user-facing way to trigger the
narrow/shallow bits from `hg clone` without also implying using of the
narrow extension...
Differential Revision: https://phab.mercurial-scm.org/D5169
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Fri, 19 Oct 2018 12:30:49 +0200 |
parents | d7007b807fa2 |
children |
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Create @ bookmark as main reference $ hg init repo $ cd repo $ echo "[extensions]" >> $HGRCPATH $ echo "patchbomb=" >> $HGRCPATH $ hg book @ Create a dummy revision that must never be exported $ echo no > no $ hg ci -Amno -d '6 0' adding no Create a feature and use -B $ hg book booktest $ echo first > a $ hg ci -Amfirst -d '7 0' adding a $ echo second > b $ hg ci -Amsecond -d '8 0' adding b $ hg email --date '1981-1-1 0:1' -n -t foo -s bookmark -B booktest From [test]: test this patch series consists of 2 patches. Write the introductory message for the patch series. Cc: displaying [PATCH 0 of 2] bookmark ... MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Subject: [PATCH 0 of 2] bookmark Message-Id: <patchbomb.347155260@test-hostname> User-Agent: Mercurial-patchbomb/* (glob) Date: Thu, 01 Jan 1981 00:01:00 +0000 From: test To: foo displaying [PATCH 1 of 2] first ... MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Subject: [PATCH 1 of 2] first X-Mercurial-Node: accde9b8b6dce861c185d0825c1affc09a79cb26 X-Mercurial-Series-Index: 1 X-Mercurial-Series-Total: 2 Message-Id: <accde9b8b6dce861c185.347155261@test-hostname> X-Mercurial-Series-Id: <accde9b8b6dce861c185.347155261@test-hostname> In-Reply-To: <patchbomb.347155260@test-hostname> References: <patchbomb.347155260@test-hostname> User-Agent: Mercurial-patchbomb/* (glob) Date: Thu, 01 Jan 1981 00:01:01 +0000 From: test To: foo # HG changeset patch # User test # Date 7 0 # Thu Jan 01 00:00:07 1970 +0000 # Node ID accde9b8b6dce861c185d0825c1affc09a79cb26 # Parent 043bd3889e5aaf7d88fe3713cf425f782ad2fb71 first diff -r 043bd3889e5a -r accde9b8b6dc a --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/a Thu Jan 01 00:00:07 1970 +0000 @@ -0,0 +1,1 @@ +first displaying [PATCH 2 of 2] second ... MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Subject: [PATCH 2 of 2] second X-Mercurial-Node: 417defd1559c396ba06a44dce8dc1c2d2d653f3f X-Mercurial-Series-Index: 2 X-Mercurial-Series-Total: 2 Message-Id: <417defd1559c396ba06a.347155262@test-hostname> X-Mercurial-Series-Id: <accde9b8b6dce861c185.347155261@test-hostname> In-Reply-To: <patchbomb.347155260@test-hostname> References: <patchbomb.347155260@test-hostname> User-Agent: Mercurial-patchbomb/* (glob) Date: Thu, 01 Jan 1981 00:01:02 +0000 From: test To: foo # HG changeset patch # User test # Date 8 0 # Thu Jan 01 00:00:08 1970 +0000 # Node ID 417defd1559c396ba06a44dce8dc1c2d2d653f3f # Parent accde9b8b6dce861c185d0825c1affc09a79cb26 second diff -r accde9b8b6dc -r 417defd1559c b --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/b Thu Jan 01 00:00:08 1970 +0000 @@ -0,0 +1,1 @@ +second Do the same and combine with -o only one must be exported $ cd .. $ hg clone repo repo2 updating to bookmark @ 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd repo $ hg up @ 0 files updated, 0 files merged, 2 files removed, 0 files unresolved (activating bookmark @) $ hg book outgoing $ echo 1 > x $ hg ci -Am1 -d '8 0' adding x created new head $ hg push ../repo2 -B outgoing pushing to ../repo2 searching for changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files (+1 heads) exporting bookmark outgoing $ echo 2 > y $ hg ci -Am2 -d '9 0' adding y $ hg email --date '1982-1-1 0:1' -n -t foo -s bookmark -B outgoing -o ../repo2 comparing with ../repo2 From [test]: test this patch series consists of 1 patches. Cc: displaying [PATCH] bookmark ... MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Subject: [PATCH] bookmark X-Mercurial-Node: 8dab2639fd35f1e337ad866c372a5c44f1064e3c X-Mercurial-Series-Index: 1 X-Mercurial-Series-Total: 1 Message-Id: <8dab2639fd35f1e337ad.378691260@test-hostname> X-Mercurial-Series-Id: <8dab2639fd35f1e337ad.378691260@test-hostname> User-Agent: Mercurial-patchbomb/* (glob) Date: Fri, 01 Jan 1982 00:01:00 +0000 From: test To: foo # HG changeset patch # User test # Date 9 0 # Thu Jan 01 00:00:09 1970 +0000 # Node ID 8dab2639fd35f1e337ad866c372a5c44f1064e3c # Parent 0b24b8316483bf30bfc3e4d4168e922b169dbe66 2 diff -r 0b24b8316483 -r 8dab2639fd35 y --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/y Thu Jan 01 00:00:09 1970 +0000 @@ -0,0 +1,1 @@ +2