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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-bundle-type.t
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bundle w/o type option
$ hg init t1
$ hg init t2
$ cd t1
$ echo blablablablabla > file.txt
$ hg ci -Ama
adding file.txt
$ hg log | grep summary
summary: a
$ hg bundle ../b1 ../t2
searching for changes
1 changesets found
$ cd ../t2
$ hg unbundle ../b1
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
new changesets c35a0f9217e6 (1 drafts)
(run 'hg update' to get a working copy)
$ hg up
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg log | grep summary
summary: a
$ cd ..
Unknown compression type is rejected
$ hg init t3
$ cd t3
$ hg -q unbundle ../b1
$ hg bundle -a -t unknown out.hg
abort: unknown is not a recognized bundle specification
(see 'hg help bundlespec' for supported values for --type)
[255]
$ hg bundle -a -t unknown-v2 out.hg
abort: unknown compression is not supported
(see 'hg help bundlespec' for supported values for --type)
[255]
$ cd ..
test bundle types
$ testbundle() {
> echo % test bundle type $1
> hg init t$1
> cd t1
> hg bundle -t $1 ../b$1 ../t$1
> f -q -B6 -D ../b$1; echo
> cd ../t$1
> hg debugbundle ../b$1
> hg debugbundle --spec ../b$1
> echo
> cd ..
> }
$ for t in "None" "bzip2" "gzip" "none-v2" "v2" "v1" "gzip-v1"; do
> testbundle $t
> done
% test bundle type None
searching for changes
1 changesets found
HG20\x00\x00 (esc)
Stream params: {}
changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
cache:rev-branch-cache -- {} (mandatory: False)
none-v2
% test bundle type bzip2
searching for changes
1 changesets found
HG20\x00\x00 (esc)
Stream params: {Compression: BZ}
changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
cache:rev-branch-cache -- {} (mandatory: False)
bzip2-v2
% test bundle type gzip
searching for changes
1 changesets found
HG20\x00\x00 (esc)
Stream params: {Compression: GZ}
changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
cache:rev-branch-cache -- {} (mandatory: False)
gzip-v2
% test bundle type none-v2
searching for changes
1 changesets found
HG20\x00\x00 (esc)
Stream params: {}
changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
cache:rev-branch-cache -- {} (mandatory: False)
none-v2
% test bundle type v2
searching for changes
1 changesets found
HG20\x00\x00 (esc)
Stream params: {Compression: BZ}
changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
cache:rev-branch-cache -- {} (mandatory: False)
bzip2-v2
% test bundle type v1
searching for changes
1 changesets found
HG10BZ
c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
bzip2-v1
% test bundle type gzip-v1
searching for changes
1 changesets found
HG10GZ
c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
gzip-v1
Compression level can be adjusted for bundle2 bundles
$ hg init test-complevel
$ cd test-complevel
$ cat > file0 << EOF
> this is a file
> with some text
> and some more text
> and other content
> EOF
$ cat > file1 << EOF
> this is another file
> with some other content
> and repeated, repeated, repeated, repeated content
> EOF
$ hg -q commit -A -m initial
$ hg bundle -a -t gzip-v2 gzip-v2.hg
1 changesets found
$ f --size gzip-v2.hg
gzip-v2.hg: size=468
$ hg --config experimental.bundlecomplevel=1 bundle -a -t gzip-v2 gzip-v2-level1.hg
1 changesets found
$ f --size gzip-v2-level1.hg
gzip-v2-level1.hg: size=475
$ hg --config experimental.bundlecomplevel.gzip=1 --config experimental.bundlelevel=9 bundle -a -t gzip-v2 gzip-v2-level1.hg
1 changesets found
$ f --size gzip-v2-level1.hg
gzip-v2-level1.hg: size=475
$ cd ..
#if zstd
$ for t in "zstd" "zstd-v2"; do
> testbundle $t
> done
% test bundle type zstd
searching for changes
1 changesets found
HG20\x00\x00 (esc)
Stream params: {Compression: ZS}
changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
cache:rev-branch-cache -- {} (mandatory: False)
zstd-v2
% test bundle type zstd-v2
searching for changes
1 changesets found
HG20\x00\x00 (esc)
Stream params: {Compression: ZS}
changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf
cache:rev-branch-cache -- {} (mandatory: False)
zstd-v2
Explicit request for zstd on non-generaldelta repos
$ hg --config format.usegeneraldelta=false init nogd
$ hg -q -R nogd pull t1
$ hg -R nogd bundle -a -t zstd nogd-zstd
1 changesets found
zstd-v1 always fails
$ hg -R tzstd bundle -a -t zstd-v1 zstd-v1
abort: compression engine zstd is not supported on v1 bundles
(see 'hg help bundlespec' for supported values for --type)
[255]
#else
zstd is a valid engine but isn't available
$ hg -R t1 bundle -a -t zstd irrelevant.hg
abort: compression engine zstd could not be loaded
[255]
#endif
test garbage file
$ echo garbage > bgarbage
$ hg init tgarbage
$ cd tgarbage
$ hg pull ../bgarbage
pulling from ../bgarbage
abort: ../bgarbage: not a Mercurial bundle
[255]
$ cd ..
test invalid bundle type
$ cd t1
$ hg bundle -a -t garbage ../bgarbage
abort: garbage is not a recognized bundle specification
(see 'hg help bundlespec' for supported values for --type)
[255]
$ cd ..