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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

Gregory Szorc - - Load All Authors

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      https://bz.mercurial-scm.org/522

      In the merge below, the file "foo" has the same contents in both

      parents, but if we look at the file-level history, we'll notice that

      the version in p1 is an ancestor of the version in p2. This test makes

      sure that we'll use the version from p2 in the manifest of the merge

      revision.

        $ hg init

        $ echo foo > foo

        $ hg ci -qAm 'add foo'

        $ echo bar >> foo

        $ hg ci -m 'change foo'

        $ hg backout -r tip -m 'backout changed foo'

        reverting foo

        changeset 2:4d9e78aaceee backs out changeset 1:b515023e500e

        $ hg up -C 0

        1 files updated, 0 files merged, 0 files removed, 0 files unresolved

        $ touch bar

        $ hg ci -qAm 'add bar'

        $ hg merge --debug

          searching for copies back to rev 1

          unmatched files in local:

           bar

        resolving manifests

         branchmerge: True, force: False, partial: False

         ancestor: bbd179dfa0a7, local: 71766447bdbb+, remote: 4d9e78aaceee

         foo: remote is newer -> g

        getting foo

        1 files updated, 0 files merged, 0 files removed, 0 files unresolved

        (branch merge, don't forget to commit)

        $ hg debugstate | grep foo

        m   0         -2 unset               foo

        $ hg st -A foo

        M foo

        $ hg ci -m 'merge'

        $ hg manifest --debug | grep foo

        c6fc755d7e68f49f880599da29f15add41f42f5a 644   foo

        $ hg debugindex foo

           rev linkrev nodeid       p1           p2

             0       0 2ed2a3912a0b 000000000000 000000000000

             1       1 6f4310b00b9a 2ed2a3912a0b 000000000000

             2       2 c6fc755d7e68 6f4310b00b9a 000000000000

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				https://bz.mercurial-scm.org/522

				In the merge below, the file "foo" has the same contents in both
				parents, but if we look at the file-level history, we'll notice that
				the version in p1 is an ancestor of the version in p2. This test makes
				sure that we'll use the version from p2 in the manifest of the merge
				revision.

				$ hg init

				$ echo foo > foo
				$ hg ci -qAm 'add foo'

				$ echo bar >> foo
				$ hg ci -m 'change foo'

				$ hg backout -r tip -m 'backout changed foo'
				reverting foo
				changeset 2:4d9e78aaceee backs out changeset 1:b515023e500e

				$ hg up -C 0
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved

				$ touch bar
				$ hg ci -qAm 'add bar'

				$ hg merge --debug
				searching for copies back to rev 1
				unmatched files in local:
				bar
				resolving manifests
				branchmerge: True, force: False, partial: False
				ancestor: bbd179dfa0a7, local: 71766447bdbb+, remote: 4d9e78aaceee
				foo: remote is newer -> g
				getting foo
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				(branch merge, don't forget to commit)

				$ hg debugstate \| grep foo
				m 0 -2 unset foo

				$ hg st -A foo
				M foo

				$ hg ci -m 'merge'

				$ hg manifest --debug \| grep foo
				c6fc755d7e68f49f880599da29f15add41f42f5a 644 foo

				$ hg debugindex foo
				rev linkrev nodeid p1 p2
				0 0 2ed2a3912a0b 000000000000 000000000000
				1 1 6f4310b00b9a 2ed2a3912a0b 000000000000
				2 2 c6fc755d7e68 6f4310b00b9a 000000000000