snapshot: consider all snapshots in the parents' chains
There are no reasons to only consider full snapshot as a possible base for an
intermediate snapshot. Now that the basic principles have been set, we can
start adding more levels of snapshots.
We now consider all snapshots in the parent's chains (full or intermediate).
This creates a chain of intermediate snapshots, each smaller than the previous
one.
# Effect On The Test Repository
In the test repository, we can see a decrease in the revlog size and slightly
shorter delta chain.
However, that approach creates snapshots more frequently, increasing the risk
of ending into problematic cases in very branchy repositories (not triggered
by the test repository). The next changesets will remove that risk by adding
logic that increases deltas reuse.
$ . $TESTDIR/wireprotohelpers.sh
$ hg init server
$ enablehttpv2 server
$ cd server
$ hg debugdrawdag << EOF
> C D
> |/
> B
> |
> A
> EOF
$ hg log -T '{rev}:{node} {desc}\n'
3:be0ef73c17ade3fc89dc41701eb9fc3a91b58282 D
2:26805aba1e600a82e93661149f2313866a221a7b C
1:112478962961147124edd43549aedd1a335e44bf B
0:426bada5c67598ca65036d57d9e4b64b0c1ce7a0 A
$ hg serve -p $HGPORT -d --pid-file hg.pid -E error.log
$ cat hg.pid > $DAEMON_PIDS
No arguments returns something reasonable
$ sendhttpv2peer << EOF
> command known
> EOF
creating http peer for wire protocol version 2
sending known command
s> POST /api/exp-http-v2-0001/ro/known HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> accept: application/mercurial-exp-framing-0005\r\n
s> content-type: application/mercurial-exp-framing-0005\r\n
s> content-length: 20\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> user-agent: Mercurial debugwireproto\r\n
s> \r\n
s> \x0c\x00\x00\x01\x00\x01\x01\x11\xa1DnameEknown
s> makefile('rb', None)
s> HTTP/1.1 200 OK\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-exp-framing-0005\r\n
s> Transfer-Encoding: chunked\r\n
s> \r\n
s> 14\r\n
s> \x0c\x00\x00\x01\x00\x02\x012
s> \xa1FstatusBok@
s> \r\n
received frame(size=12; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=eos)
s> 0\r\n
s> \r\n
response: []
Single known node works
$ sendhttpv2peer << EOF
> command known
> nodes eval:[b'\x42\x6b\xad\xa5\xc6\x75\x98\xca\x65\x03\x6d\x57\xd9\xe4\xb6\x4b\x0c\x1c\xe7\xa0']
> EOF
creating http peer for wire protocol version 2
sending known command
s> POST /api/exp-http-v2-0001/ro/known HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> accept: application/mercurial-exp-framing-0005\r\n
s> content-type: application/mercurial-exp-framing-0005\r\n
s> content-length: 54\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> user-agent: Mercurial debugwireproto\r\n
s> \r\n
s> .\x00\x00\x01\x00\x01\x01\x11\xa2Dargs\xa1Enodes\x81TBk\xad\xa5\xc6u\x98\xcae\x03mW\xd9\xe4\xb6K\x0c\x1c\xe7\xa0DnameEknown
s> makefile('rb', None)
s> HTTP/1.1 200 OK\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-exp-framing-0005\r\n
s> Transfer-Encoding: chunked\r\n
s> \r\n
s> 15\r\n
s> \r\x00\x00\x01\x00\x02\x012
s> \xa1FstatusBokA1
s> \r\n
received frame(size=13; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=eos)
s> 0\r\n
s> \r\n
response: [
True
]
Multiple nodes works
$ sendhttpv2peer << EOF
> command known
> nodes eval:[b'\x42\x6b\xad\xa5\xc6\x75\x98\xca\x65\x03\x6d\x57\xd9\xe4\xb6\x4b\x0c\x1c\xe7\xa0', b'00000000000000000000', b'\x11\x24\x78\x96\x29\x61\x14\x71\x24\xed\xd4\x35\x49\xae\xdd\x1a\x33\x5e\x44\xbf']
> EOF
creating http peer for wire protocol version 2
sending known command
s> POST /api/exp-http-v2-0001/ro/known HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> accept: application/mercurial-exp-framing-0005\r\n
s> content-type: application/mercurial-exp-framing-0005\r\n
s> content-length: 96\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> user-agent: Mercurial debugwireproto\r\n
s> \r\n
s> X\x00\x00\x01\x00\x01\x01\x11\xa2Dargs\xa1Enodes\x83TBk\xad\xa5\xc6u\x98\xcae\x03mW\xd9\xe4\xb6K\x0c\x1c\xe7\xa0T00000000000000000000T\x11$x\x96)a\x14q$\xed\xd45I\xae\xdd\x1a3^D\xbfDnameEknown
s> makefile('rb', None)
s> HTTP/1.1 200 OK\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-exp-framing-0005\r\n
s> Transfer-Encoding: chunked\r\n
s> \r\n
s> 17\r\n
s> \x0f\x00\x00\x01\x00\x02\x012
s> \xa1FstatusBokC101
s> \r\n
received frame(size=15; request=1; stream=2; streamflags=stream-begin; type=command-response; flags=eos)
s> 0\r\n
s> \r\n
response: [
True,
False,
True
]
$ cat error.log