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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
Yuya Nishihara - - Load All Authors

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test-clone-uncompressed.t
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#require serve no-reposimplestore no-chg
#testcases stream-legacy stream-bundle2
#if stream-bundle2
$ cat << EOF >> $HGRCPATH
> [experimental]
> bundle2.stream = yes
> EOF
#endif
Initialize repository
the status call is to check for issue5130
$ hg init server
$ cd server
$ touch foo
$ hg -q commit -A -m initial
>>> for i in range(1024):
... with open(str(i), 'wb') as fh:
... fh.write(b"%d" % i) and None
$ hg -q commit -A -m 'add a lot of files'
$ hg st
$ hg --config server.uncompressed=false serve -p $HGPORT -d --pid-file=hg.pid
$ cat hg.pid > $DAEMON_PIDS
$ cd ..
Cannot stream clone when server.uncompressed is set
$ get-with-headers.py $LOCALIP:$HGPORT '?cmd=stream_out'
200 Script output follows
1
#if stream-legacy
$ hg debugcapabilities http://localhost:$HGPORT
Main capabilities:
batch
branchmap
$USUAL_BUNDLE2_CAPS_SERVER$
changegroupsubset
compression=$BUNDLE2_COMPRESSIONS$
getbundle
httpheader=1024
httpmediatype=0.1rx,0.1tx,0.2tx
known
lookup
pushkey
unbundle=HG10GZ,HG10BZ,HG10UN
unbundlehash
Bundle2 capabilities:
HG20
bookmarks
changegroup
01
02
digests
md5
sha1
sha512
error
abort
unsupportedcontent
pushraced
pushkey
hgtagsfnodes
listkeys
phases
heads
pushkey
remote-changegroup
http
https
rev-branch-cache
$ hg clone --stream -U http://localhost:$HGPORT server-disabled
warning: stream clone requested but server has them disabled
requesting all changes
adding changesets
adding manifests
adding file changes
added 2 changesets with 1025 changes to 1025 files
new changesets 96ee1d7354c4:c17445101a72
$ get-with-headers.py $LOCALIP:$HGPORT '?cmd=getbundle' content-type --bodyfile body --hgproto 0.2 --requestheader "x-hgarg-1=bundlecaps=HG20%2Cbundle2%3DHG20%250Abookmarks%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Aphases%253Dheads%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps&cg=0&common=0000000000000000000000000000000000000000&heads=c17445101a72edac06facd130d14808dfbd5c7c2&stream=1"
200 Script output follows
content-type: application/mercurial-0.2
$ f --size body --hexdump --bytes 100
body: size=232
0000: 04 6e 6f 6e 65 48 47 32 30 00 00 00 00 00 00 00 |.noneHG20.......|
0010: cf 0b 45 52 52 4f 52 3a 41 42 4f 52 54 00 00 00 |..ERROR:ABORT...|
0020: 00 01 01 07 3c 04 72 6d 65 73 73 61 67 65 73 74 |....<.rmessagest|
0030: 72 65 61 6d 20 64 61 74 61 20 72 65 71 75 65 73 |ream data reques|
0040: 74 65 64 20 62 75 74 20 73 65 72 76 65 72 20 64 |ted but server d|
0050: 6f 65 73 20 6e 6f 74 20 61 6c 6c 6f 77 20 74 68 |oes not allow th|
0060: 69 73 20 66 |is f|
#endif
#if stream-bundle2
$ hg debugcapabilities http://localhost:$HGPORT
Main capabilities:
batch
branchmap
$USUAL_BUNDLE2_CAPS_SERVER$
changegroupsubset
compression=$BUNDLE2_COMPRESSIONS$
getbundle
httpheader=1024
httpmediatype=0.1rx,0.1tx,0.2tx
known
lookup
pushkey
unbundle=HG10GZ,HG10BZ,HG10UN
unbundlehash
Bundle2 capabilities:
HG20
bookmarks
changegroup
01
02
digests
md5
sha1
sha512
error
abort
unsupportedcontent
pushraced
pushkey
hgtagsfnodes
listkeys
phases
heads
pushkey
remote-changegroup
http
https
rev-branch-cache
$ hg clone --stream -U http://localhost:$HGPORT server-disabled
warning: stream clone requested but server has them disabled
requesting all changes
adding changesets
adding manifests
adding file changes
added 2 changesets with 1025 changes to 1025 files
new changesets 96ee1d7354c4:c17445101a72
$ get-with-headers.py $LOCALIP:$HGPORT '?cmd=getbundle' content-type --bodyfile body --hgproto 0.2 --requestheader "x-hgarg-1=bundlecaps=HG20%2Cbundle2%3DHG20%250Abookmarks%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Aphases%253Dheads%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps&cg=0&common=0000000000000000000000000000000000000000&heads=c17445101a72edac06facd130d14808dfbd5c7c2&stream=1"
200 Script output follows
content-type: application/mercurial-0.2
$ f --size body --hexdump --bytes 100
body: size=232
0000: 04 6e 6f 6e 65 48 47 32 30 00 00 00 00 00 00 00 |.noneHG20.......|
0010: cf 0b 45 52 52 4f 52 3a 41 42 4f 52 54 00 00 00 |..ERROR:ABORT...|
0020: 00 01 01 07 3c 04 72 6d 65 73 73 61 67 65 73 74 |....<.rmessagest|
0030: 72 65 61 6d 20 64 61 74 61 20 72 65 71 75 65 73 |ream data reques|
0040: 74 65 64 20 62 75 74 20 73 65 72 76 65 72 20 64 |ted but server d|
0050: 6f 65 73 20 6e 6f 74 20 61 6c 6c 6f 77 20 74 68 |oes not allow th|
0060: 69 73 20 66 |is f|
#endif
$ killdaemons.py
$ cd server
$ hg serve -p $HGPORT -d --pid-file=hg.pid
$ cat hg.pid > $DAEMON_PIDS
$ cd ..
Basic clone
#if stream-legacy
$ hg clone --stream -U http://localhost:$HGPORT clone1
streaming all changes
1027 files to transfer, 96.3 KB of data
transferred 96.3 KB in * seconds (*/sec) (glob)
searching for changes
no changes found
#endif
#if stream-bundle2
$ hg clone --stream -U http://localhost:$HGPORT clone1
streaming all changes
1030 files to transfer, 96.4 KB of data
transferred 96.4 KB in * seconds (* */sec) (glob)
$ ls -1 clone1/.hg/cache
branch2-served
rbc-names-v1
rbc-revs-v1
#endif
getbundle requests with stream=1 are uncompressed
$ get-with-headers.py $LOCALIP:$HGPORT '?cmd=getbundle' content-type --bodyfile body --hgproto '0.1 0.2 comp=zlib,none' --requestheader "x-hgarg-1=bundlecaps=HG20%2Cbundle2%3DHG20%250Abookmarks%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Aphases%253Dheads%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps&cg=0&common=0000000000000000000000000000000000000000&heads=c17445101a72edac06facd130d14808dfbd5c7c2&stream=1"
200 Script output follows
content-type: application/mercurial-0.2
$ f --size --hex --bytes 256 body
body: size=112230
0000: 04 6e 6f 6e 65 48 47 32 30 00 00 00 00 00 00 00 |.noneHG20.......|
0010: 70 07 53 54 52 45 41 4d 32 00 00 00 00 03 00 09 |p.STREAM2.......|
0020: 05 09 04 0c 35 62 79 74 65 63 6f 75 6e 74 39 38 |....5bytecount98|
0030: 37 35 38 66 69 6c 65 63 6f 75 6e 74 31 30 33 30 |758filecount1030|
0040: 72 65 71 75 69 72 65 6d 65 6e 74 73 64 6f 74 65 |requirementsdote|
0050: 6e 63 6f 64 65 25 32 43 66 6e 63 61 63 68 65 25 |ncode%2Cfncache%|
0060: 32 43 67 65 6e 65 72 61 6c 64 65 6c 74 61 25 32 |2Cgeneraldelta%2|
0070: 43 72 65 76 6c 6f 67 76 31 25 32 43 73 74 6f 72 |Crevlogv1%2Cstor|
0080: 65 00 00 80 00 73 08 42 64 61 74 61 2f 30 2e 69 |e....s.Bdata/0.i|
0090: 00 03 00 01 00 00 00 00 00 00 00 02 00 00 00 01 |................|
00a0: 00 00 00 00 00 00 00 01 ff ff ff ff ff ff ff ff |................|
00b0: 80 29 63 a0 49 d3 23 87 bf ce fe 56 67 92 67 2c |.)c.I.#....Vg.g,|
00c0: 69 d1 ec 39 00 00 00 00 00 00 00 00 00 00 00 00 |i..9............|
00d0: 75 30 73 08 42 64 61 74 61 2f 31 2e 69 00 03 00 |u0s.Bdata/1.i...|
00e0: 01 00 00 00 00 00 00 00 02 00 00 00 01 00 00 00 |................|
00f0: 00 00 00 00 01 ff ff ff ff ff ff ff ff f9 76 da |..............v.|
--uncompressed is an alias to --stream
#if stream-legacy
$ hg clone --uncompressed -U http://localhost:$HGPORT clone1-uncompressed
streaming all changes
1027 files to transfer, 96.3 KB of data
transferred 96.3 KB in * seconds (*/sec) (glob)
searching for changes
no changes found
#endif
#if stream-bundle2
$ hg clone --uncompressed -U http://localhost:$HGPORT clone1-uncompressed
streaming all changes
1030 files to transfer, 96.4 KB of data
transferred 96.4 KB in * seconds (* */sec) (glob)
#endif
Clone with background file closing enabled
#if stream-legacy
$ hg --debug --config worker.backgroundclose=true --config worker.backgroundcloseminfilecount=1 clone --stream -U http://localhost:$HGPORT clone-background | grep -v adding
using http://localhost:$HGPORT/
sending capabilities command
sending branchmap command
streaming all changes
sending stream_out command
1027 files to transfer, 96.3 KB of data
starting 4 threads for background file closing
updating the branch cache
transferred 96.3 KB in * seconds (*/sec) (glob)
query 1; heads
sending batch command
searching for changes
all remote heads known locally
no changes found
sending getbundle command
bundle2-input-bundle: with-transaction
bundle2-input-part: "listkeys" (params: 1 mandatory) supported
bundle2-input-part: "phase-heads" supported
bundle2-input-part: total payload size 24
bundle2-input-bundle: 1 parts total
checking for updated bookmarks
#endif
#if stream-bundle2
$ hg --debug --config worker.backgroundclose=true --config worker.backgroundcloseminfilecount=1 clone --stream -U http://localhost:$HGPORT clone-background | grep -v adding
using http://localhost:$HGPORT/
sending capabilities command
query 1; heads
sending batch command
streaming all changes
sending getbundle command
bundle2-input-bundle: with-transaction
bundle2-input-part: "stream2" (params: 3 mandatory) supported
applying stream bundle
1030 files to transfer, 96.4 KB of data
starting 4 threads for background file closing
starting 4 threads for background file closing
updating the branch cache
transferred 96.4 KB in * seconds (* */sec) (glob)
bundle2-input-part: total payload size 112077
bundle2-input-part: "listkeys" (params: 1 mandatory) supported
bundle2-input-bundle: 1 parts total
checking for updated bookmarks
#endif
Cannot stream clone when there are secret changesets
$ hg -R server phase --force --secret -r tip
$ hg clone --stream -U http://localhost:$HGPORT secret-denied
warning: stream clone requested but server has them disabled
requesting all changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
new changesets 96ee1d7354c4
$ killdaemons.py
Streaming of secrets can be overridden by server config
$ cd server
$ hg serve --config server.uncompressedallowsecret=true -p $HGPORT -d --pid-file=hg.pid
$ cat hg.pid > $DAEMON_PIDS
$ cd ..
#if stream-legacy
$ hg clone --stream -U http://localhost:$HGPORT secret-allowed
streaming all changes
1027 files to transfer, 96.3 KB of data
transferred 96.3 KB in * seconds (*/sec) (glob)
searching for changes
no changes found
#endif
#if stream-bundle2
$ hg clone --stream -U http://localhost:$HGPORT secret-allowed
streaming all changes
1030 files to transfer, 96.4 KB of data
transferred 96.4 KB in * seconds (* */sec) (glob)
#endif
$ killdaemons.py
Verify interaction between preferuncompressed and secret presence
$ cd server
$ hg serve --config server.preferuncompressed=true -p $HGPORT -d --pid-file=hg.pid
$ cat hg.pid > $DAEMON_PIDS
$ cd ..
$ hg clone -U http://localhost:$HGPORT preferuncompressed-secret
requesting all changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
new changesets 96ee1d7354c4
$ killdaemons.py
Clone not allowed when full bundles disabled and can't serve secrets
$ cd server
$ hg serve --config server.disablefullbundle=true -p $HGPORT -d --pid-file=hg.pid
$ cat hg.pid > $DAEMON_PIDS
$ cd ..
$ hg clone --stream http://localhost:$HGPORT secret-full-disabled
warning: stream clone requested but server has them disabled
requesting all changes
remote: abort: server has pull-based clones disabled
abort: pull failed on remote
(remove --pull if specified or upgrade Mercurial)
[255]
Local stream clone with secrets involved
(This is just a test over behavior: if you have access to the repo's files,
there is no security so it isn't important to prevent a clone here.)
$ hg clone -U --stream server local-secret
warning: stream clone requested but server has them disabled
requesting all changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
new changesets 96ee1d7354c4
Stream clone while repo is changing:
$ mkdir changing
$ cd changing
extension for delaying the server process so we reliably can modify the repo
while cloning
$ cat > delayer.py <<EOF
> import time
> from mercurial import extensions, vfs
> def __call__(orig, self, path, *args, **kwargs):
> if path == 'data/f1.i':
> time.sleep(2)
> return orig(self, path, *args, **kwargs)
> extensions.wrapfunction(vfs.vfs, '__call__', __call__)
> EOF
prepare repo with small and big file to cover both code paths in emitrevlogdata
$ hg init repo
$ touch repo/f1
$ $TESTDIR/seq.py 50000 > repo/f2
$ hg -R repo ci -Aqm "0"
$ hg serve -R repo -p $HGPORT1 -d --pid-file=hg.pid --config extensions.delayer=delayer.py
$ cat hg.pid >> $DAEMON_PIDS
clone while modifying the repo between stating file with write lock and
actually serving file content
$ hg clone -q --stream -U http://localhost:$HGPORT1 clone &
$ sleep 1
$ echo >> repo/f1
$ echo >> repo/f2
$ hg -R repo ci -m "1"
$ wait
$ hg -R clone id
000000000000
$ cd ..
Stream repository with bookmarks
--------------------------------
(revert introduction of secret changeset)
$ hg -R server phase --draft 'secret()'
add a bookmark
$ hg -R server bookmark -r tip some-bookmark
clone it
#if stream-legacy
$ hg clone --stream http://localhost:$HGPORT with-bookmarks
streaming all changes
1027 files to transfer, 96.3 KB of data
transferred 96.3 KB in * seconds (*) (glob)
searching for changes
no changes found
updating to branch default
1025 files updated, 0 files merged, 0 files removed, 0 files unresolved
#endif
#if stream-bundle2
$ hg clone --stream http://localhost:$HGPORT with-bookmarks
streaming all changes
1033 files to transfer, 96.6 KB of data
transferred 96.6 KB in * seconds (* */sec) (glob)
updating to branch default
1025 files updated, 0 files merged, 0 files removed, 0 files unresolved
#endif
$ hg -R with-bookmarks bookmarks
some-bookmark 1:c17445101a72
Stream repository with phases
-----------------------------
Clone as publishing
$ hg -R server phase -r 'all()'
0: draft
1: draft
#if stream-legacy
$ hg clone --stream http://localhost:$HGPORT phase-publish
streaming all changes
1027 files to transfer, 96.3 KB of data
transferred 96.3 KB in * seconds (*) (glob)
searching for changes
no changes found
updating to branch default
1025 files updated, 0 files merged, 0 files removed, 0 files unresolved
#endif
#if stream-bundle2
$ hg clone --stream http://localhost:$HGPORT phase-publish
streaming all changes
1033 files to transfer, 96.6 KB of data
transferred 96.6 KB in * seconds (* */sec) (glob)
updating to branch default
1025 files updated, 0 files merged, 0 files removed, 0 files unresolved
#endif
$ hg -R phase-publish phase -r 'all()'
0: public
1: public
Clone as non publishing
$ cat << EOF >> server/.hg/hgrc
> [phases]
> publish = False
> EOF
$ killdaemons.py
$ hg -R server serve -p $HGPORT -d --pid-file=hg.pid
$ cat hg.pid > $DAEMON_PIDS
#if stream-legacy
With v1 of the stream protocol, changeset are always cloned as public. It make
stream v1 unsuitable for non-publishing repository.
$ hg clone --stream http://localhost:$HGPORT phase-no-publish
streaming all changes
1027 files to transfer, 96.3 KB of data
transferred 96.3 KB in * seconds (*) (glob)
searching for changes
no changes found
updating to branch default
1025 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg -R phase-no-publish phase -r 'all()'
0: public
1: public
#endif
#if stream-bundle2
$ hg clone --stream http://localhost:$HGPORT phase-no-publish
streaming all changes
1034 files to transfer, 96.7 KB of data
transferred 96.7 KB in * seconds (* */sec) (glob)
updating to branch default
1025 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg -R phase-no-publish phase -r 'all()'
0: draft
1: draft
#endif
$ killdaemons.py