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sshpeer: initial definition and implementation of new SSH protocol...
sshpeer: initial definition and implementation of new SSH protocol The existing SSH protocol has several design flaws. Future commits will elaborate on these flaws as new features are introduced to combat these flaws. For now, hopefully you can take me for my word that a ground up rewrite of the SSH protocol is needed. This commit lays the foundation for a new SSH protocol by defining a mechanism to upgrade the SSH transport channel away from the default (version 1) protocol to something modern (which we'll call "version 2" for now). This upgrade process is detailed in the internals documentation for the wire protocol. The gist of it is the client sends a request line preceding the "hello" command/line which basically says "I'm requesting an upgrade: here's what I support." If the server recognizes that line, it processes the upgrade request and the transport channel is switched to use the new version of the protocol. If not, it sends an empty response, which is how all Mercurial SSH servers from the beginning of time reacted to unknown commands. The upgrade request is effectively ignored and the client continues to use the existing version of the protocol as if nothing happened. The new version of the SSH protocol is completely identical to version 1 aside from the upgrade dance and the bytes that follow. The immediate bytes that follow the protocol switch are defined to be a length framed "capabilities: " line containing the remote's advertised capabilities. In reality, this looks very similar to what the "hello" response would look like. But it will evolve quickly. The methodology by which the protocol will evolve is important. I'm not going to introduce the new protocol all at once. That would likely lead to endless bike shedding and forward progress would stall. Instead, I intend to tricle out new features and diversions from the existing protocol in small, incremental changes. To support the gradual evolution of the protocol, the on-the-wire advertised protocol name contains an "exp" to denote "experimental" and a 4 digit field to capture the sub-version of the protocol. Whenever we make a BC change to the wire protocol, we can increment this version and lock out all older clients because it will appear as a completely different protocol version. This means we can incur as many breaking changes as we want. We don't have to commit to supporting any one feature or idea for a long period of time. We can even evolve the handshake mechanism, because that is defined as being an implementation detail of the negotiated protocol version! Hopefully this lowers the barrier to accepting changes to the protocol and for experimenting with "radical" ideas during its development. In core, sshpeer received most of the attention. We haven't even implemented the server bits for the new protocol in core yet. Instead, we add very primitive support to our test server, mainly just to exercise the added code paths in sshpeer. Differential Revision: https://phab.mercurial-scm.org/D2061 # no-check-commit because of required foo_bar naming
Augie Fackler - - Load All Authors

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test-getbundle.t
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#require serve
= Test the getbundle() protocol function =
Create a test repository:
$ hg init repo
$ cd repo
$ hg debugbuilddag -n -m '+2 :fork +5 :p1 *fork +6 :p2 /p1 :m1 +3' > /dev/null
$ hg log -G --template '{node}\n'
o 10c14a2cc935e1d8c31f9e98587dcf27fb08a6da
|
o 4801a72e5d88cb515b0c7e40fae34180f3f837f2
|
o 0b2f73f04880d9cb6a5cd8a757f0db0ad01e32c3
|
o 8365676dbab05860ce0d9110f2af51368b961bbd
|\
| o 5686dbbd9fc46cb806599c878d02fe1cb56b83d3
| |
| o 13c0170174366b441dc68e8e33757232fa744458
| |
| o 63476832d8ec6558cf9bbe3cbe0c757e5cf18043
| |
| o 700b7e19db54103633c4bf4a6a6b6d55f4d50c03
| |
| o 928b5f94cdb278bb536eba552de348a4e92ef24d
| |
| o f34414c64173e0ecb61b25dc55e116dbbcc89bee
| |
| o 8931463777131cd73923e560b760061f2aa8a4bc
| |
o | 6621d79f61b23ec74cf4b69464343d9e0980ec8b
| |
o | bac16991d12ff45f9dc43c52da1946dfadb83e80
| |
o | ff42371d57168345fdf1a3aac66a51f6a45d41d2
| |
o | d5f6e1ea452285324836a49d7d3c2a63cfed1d31
| |
o | 713346a995c363120712aed1aee7e04afd867638
|/
o 29a4d1f17bd3f0779ca0525bebb1cfb51067c738
|
o 7704483d56b2a7b5db54dcee7c62378ac629b348
$ cd ..
= Test locally =
Get everything:
$ hg debuggetbundle repo bundle
$ hg debugbundle bundle
7704483d56b2a7b5db54dcee7c62378ac629b348
29a4d1f17bd3f0779ca0525bebb1cfb51067c738
713346a995c363120712aed1aee7e04afd867638
d5f6e1ea452285324836a49d7d3c2a63cfed1d31
ff42371d57168345fdf1a3aac66a51f6a45d41d2
bac16991d12ff45f9dc43c52da1946dfadb83e80
6621d79f61b23ec74cf4b69464343d9e0980ec8b
8931463777131cd73923e560b760061f2aa8a4bc
f34414c64173e0ecb61b25dc55e116dbbcc89bee
928b5f94cdb278bb536eba552de348a4e92ef24d
700b7e19db54103633c4bf4a6a6b6d55f4d50c03
63476832d8ec6558cf9bbe3cbe0c757e5cf18043
13c0170174366b441dc68e8e33757232fa744458
5686dbbd9fc46cb806599c878d02fe1cb56b83d3
8365676dbab05860ce0d9110f2af51368b961bbd
0b2f73f04880d9cb6a5cd8a757f0db0ad01e32c3
4801a72e5d88cb515b0c7e40fae34180f3f837f2
10c14a2cc935e1d8c31f9e98587dcf27fb08a6da
Get part of linear run:
$ hg debuggetbundle repo bundle -H 4801a72e5d88cb515b0c7e40fae34180f3f837f2 -C 8365676dbab05860ce0d9110f2af51368b961bbd
$ hg debugbundle bundle
0b2f73f04880d9cb6a5cd8a757f0db0ad01e32c3
4801a72e5d88cb515b0c7e40fae34180f3f837f2
Get missing branch and merge:
$ hg debuggetbundle repo bundle -H 4801a72e5d88cb515b0c7e40fae34180f3f837f2 -C 13c0170174366b441dc68e8e33757232fa744458
$ hg debugbundle bundle
713346a995c363120712aed1aee7e04afd867638
d5f6e1ea452285324836a49d7d3c2a63cfed1d31
ff42371d57168345fdf1a3aac66a51f6a45d41d2
bac16991d12ff45f9dc43c52da1946dfadb83e80
6621d79f61b23ec74cf4b69464343d9e0980ec8b
5686dbbd9fc46cb806599c878d02fe1cb56b83d3
8365676dbab05860ce0d9110f2af51368b961bbd
0b2f73f04880d9cb6a5cd8a757f0db0ad01e32c3
4801a72e5d88cb515b0c7e40fae34180f3f837f2
Get from only one head:
$ hg debuggetbundle repo bundle -H 928b5f94cdb278bb536eba552de348a4e92ef24d -C 29a4d1f17bd3f0779ca0525bebb1cfb51067c738
$ hg debugbundle bundle
8931463777131cd73923e560b760061f2aa8a4bc
f34414c64173e0ecb61b25dc55e116dbbcc89bee
928b5f94cdb278bb536eba552de348a4e92ef24d
Get parts of two branches:
$ hg debuggetbundle repo bundle -H 13c0170174366b441dc68e8e33757232fa744458 -C 700b7e19db54103633c4bf4a6a6b6d55f4d50c03 -H bac16991d12ff45f9dc43c52da1946dfadb83e80 -C d5f6e1ea452285324836a49d7d3c2a63cfed1d31
$ hg debugbundle bundle
ff42371d57168345fdf1a3aac66a51f6a45d41d2
bac16991d12ff45f9dc43c52da1946dfadb83e80
63476832d8ec6558cf9bbe3cbe0c757e5cf18043
13c0170174366b441dc68e8e33757232fa744458
Check that we get all needed file changes:
$ hg debugbundle bundle --all
format: id, p1, p2, cset, delta base, len(delta)
changelog
ff42371d57168345fdf1a3aac66a51f6a45d41d2 d5f6e1ea452285324836a49d7d3c2a63cfed1d31 0000000000000000000000000000000000000000 ff42371d57168345fdf1a3aac66a51f6a45d41d2 d5f6e1ea452285324836a49d7d3c2a63cfed1d31 99
bac16991d12ff45f9dc43c52da1946dfadb83e80 ff42371d57168345fdf1a3aac66a51f6a45d41d2 0000000000000000000000000000000000000000 bac16991d12ff45f9dc43c52da1946dfadb83e80 ff42371d57168345fdf1a3aac66a51f6a45d41d2 99
63476832d8ec6558cf9bbe3cbe0c757e5cf18043 700b7e19db54103633c4bf4a6a6b6d55f4d50c03 0000000000000000000000000000000000000000 63476832d8ec6558cf9bbe3cbe0c757e5cf18043 bac16991d12ff45f9dc43c52da1946dfadb83e80 102
13c0170174366b441dc68e8e33757232fa744458 63476832d8ec6558cf9bbe3cbe0c757e5cf18043 0000000000000000000000000000000000000000 13c0170174366b441dc68e8e33757232fa744458 63476832d8ec6558cf9bbe3cbe0c757e5cf18043 102
manifest
dac7984588fc4eea7acbf39693a9c1b06f5b175d 591f732a3faf1fb903815273f3c199a514a61ccb 0000000000000000000000000000000000000000 ff42371d57168345fdf1a3aac66a51f6a45d41d2 591f732a3faf1fb903815273f3c199a514a61ccb 113
0772616e6b48a76afb6c1458e193cbb3dae2e4ff dac7984588fc4eea7acbf39693a9c1b06f5b175d 0000000000000000000000000000000000000000 bac16991d12ff45f9dc43c52da1946dfadb83e80 dac7984588fc4eea7acbf39693a9c1b06f5b175d 113
eb498cd9af6c44108e43041e951ce829e29f6c80 bff2f4817ced57b386caf7c4e3e36a4bc9af7e93 0000000000000000000000000000000000000000 63476832d8ec6558cf9bbe3cbe0c757e5cf18043 0772616e6b48a76afb6c1458e193cbb3dae2e4ff 295
b15709c071ddd2d93188508ba156196ab4f19620 eb498cd9af6c44108e43041e951ce829e29f6c80 0000000000000000000000000000000000000000 13c0170174366b441dc68e8e33757232fa744458 eb498cd9af6c44108e43041e951ce829e29f6c80 114
mf
4f73f97080266ab8e0c0561ca8d0da3eaf65b695 301ca08d026bb72cb4258a9d211bdf7ca0bcd810 0000000000000000000000000000000000000000 ff42371d57168345fdf1a3aac66a51f6a45d41d2 301ca08d026bb72cb4258a9d211bdf7ca0bcd810 17
c7b583de053293870e145f45bd2d61643563fd06 4f73f97080266ab8e0c0561ca8d0da3eaf65b695 0000000000000000000000000000000000000000 bac16991d12ff45f9dc43c52da1946dfadb83e80 4f73f97080266ab8e0c0561ca8d0da3eaf65b695 18
266ee3c0302a5a18f1cf96817ac79a51836179e9 edc0f6b8db80d68ae6aff2b19f7e5347ab68fa63 0000000000000000000000000000000000000000 63476832d8ec6558cf9bbe3cbe0c757e5cf18043 c7b583de053293870e145f45bd2d61643563fd06 149
698c6a36220548cd3903ca7dada27c59aa500c52 266ee3c0302a5a18f1cf96817ac79a51836179e9 0000000000000000000000000000000000000000 13c0170174366b441dc68e8e33757232fa744458 266ee3c0302a5a18f1cf96817ac79a51836179e9 19
nf11
33fbc651630ffa7ccbebfe4eb91320a873e7291c 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 63476832d8ec6558cf9bbe3cbe0c757e5cf18043 0000000000000000000000000000000000000000 16
nf12
ddce0544363f037e9fb889faca058f52dc01c0a5 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 13c0170174366b441dc68e8e33757232fa744458 0000000000000000000000000000000000000000 16
nf4
3c1407305701051cbed9f9cb9a68bdfb5997c235 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 ff42371d57168345fdf1a3aac66a51f6a45d41d2 0000000000000000000000000000000000000000 15
nf5
0dbd89c185f53a1727c54cd1ce256482fa23968e 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 bac16991d12ff45f9dc43c52da1946dfadb83e80 0000000000000000000000000000000000000000 15
Get branch and merge:
$ hg debuggetbundle repo bundle -C 7704483d56b2a7b5db54dcee7c62378ac629b348 -H 0b2f73f04880d9cb6a5cd8a757f0db0ad01e32c3
$ hg debugbundle bundle
29a4d1f17bd3f0779ca0525bebb1cfb51067c738
713346a995c363120712aed1aee7e04afd867638
d5f6e1ea452285324836a49d7d3c2a63cfed1d31
ff42371d57168345fdf1a3aac66a51f6a45d41d2
bac16991d12ff45f9dc43c52da1946dfadb83e80
6621d79f61b23ec74cf4b69464343d9e0980ec8b
8931463777131cd73923e560b760061f2aa8a4bc
f34414c64173e0ecb61b25dc55e116dbbcc89bee
928b5f94cdb278bb536eba552de348a4e92ef24d
700b7e19db54103633c4bf4a6a6b6d55f4d50c03
63476832d8ec6558cf9bbe3cbe0c757e5cf18043
13c0170174366b441dc68e8e33757232fa744458
5686dbbd9fc46cb806599c878d02fe1cb56b83d3
8365676dbab05860ce0d9110f2af51368b961bbd
0b2f73f04880d9cb6a5cd8a757f0db0ad01e32c3
= Test bundle2 =
$ hg debuggetbundle repo bundle -t bundle2
$ hg debugbundle bundle
Stream params: {}
changegroup -- {version: 01}
7704483d56b2a7b5db54dcee7c62378ac629b348
29a4d1f17bd3f0779ca0525bebb1cfb51067c738
713346a995c363120712aed1aee7e04afd867638
d5f6e1ea452285324836a49d7d3c2a63cfed1d31
ff42371d57168345fdf1a3aac66a51f6a45d41d2
bac16991d12ff45f9dc43c52da1946dfadb83e80
6621d79f61b23ec74cf4b69464343d9e0980ec8b
8931463777131cd73923e560b760061f2aa8a4bc
f34414c64173e0ecb61b25dc55e116dbbcc89bee
928b5f94cdb278bb536eba552de348a4e92ef24d
700b7e19db54103633c4bf4a6a6b6d55f4d50c03
63476832d8ec6558cf9bbe3cbe0c757e5cf18043
13c0170174366b441dc68e8e33757232fa744458
5686dbbd9fc46cb806599c878d02fe1cb56b83d3
8365676dbab05860ce0d9110f2af51368b961bbd
0b2f73f04880d9cb6a5cd8a757f0db0ad01e32c3
4801a72e5d88cb515b0c7e40fae34180f3f837f2
10c14a2cc935e1d8c31f9e98587dcf27fb08a6da
= Test via HTTP =
Get everything:
$ hg serve -R repo -p $HGPORT -d --pid-file=hg.pid -E error.log -A access.log
$ cat hg.pid >> $DAEMON_PIDS
$ hg debuggetbundle http://localhost:$HGPORT/ bundle
$ hg debugbundle bundle
7704483d56b2a7b5db54dcee7c62378ac629b348
29a4d1f17bd3f0779ca0525bebb1cfb51067c738
713346a995c363120712aed1aee7e04afd867638
d5f6e1ea452285324836a49d7d3c2a63cfed1d31
ff42371d57168345fdf1a3aac66a51f6a45d41d2
bac16991d12ff45f9dc43c52da1946dfadb83e80
6621d79f61b23ec74cf4b69464343d9e0980ec8b
8931463777131cd73923e560b760061f2aa8a4bc
f34414c64173e0ecb61b25dc55e116dbbcc89bee
928b5f94cdb278bb536eba552de348a4e92ef24d
700b7e19db54103633c4bf4a6a6b6d55f4d50c03
63476832d8ec6558cf9bbe3cbe0c757e5cf18043
13c0170174366b441dc68e8e33757232fa744458
5686dbbd9fc46cb806599c878d02fe1cb56b83d3
8365676dbab05860ce0d9110f2af51368b961bbd
0b2f73f04880d9cb6a5cd8a757f0db0ad01e32c3
4801a72e5d88cb515b0c7e40fae34180f3f837f2
10c14a2cc935e1d8c31f9e98587dcf27fb08a6da
Get parts of two branches:
$ hg debuggetbundle http://localhost:$HGPORT/ bundle -H 13c0170174366b441dc68e8e33757232fa744458 -C 700b7e19db54103633c4bf4a6a6b6d55f4d50c03 -H bac16991d12ff45f9dc43c52da1946dfadb83e80 -C d5f6e1ea452285324836a49d7d3c2a63cfed1d31
$ hg debugbundle bundle
ff42371d57168345fdf1a3aac66a51f6a45d41d2
bac16991d12ff45f9dc43c52da1946dfadb83e80
63476832d8ec6558cf9bbe3cbe0c757e5cf18043
13c0170174366b441dc68e8e33757232fa744458
Check that we get all needed file changes:
$ hg debugbundle bundle --all
format: id, p1, p2, cset, delta base, len(delta)
changelog
ff42371d57168345fdf1a3aac66a51f6a45d41d2 d5f6e1ea452285324836a49d7d3c2a63cfed1d31 0000000000000000000000000000000000000000 ff42371d57168345fdf1a3aac66a51f6a45d41d2 d5f6e1ea452285324836a49d7d3c2a63cfed1d31 99
bac16991d12ff45f9dc43c52da1946dfadb83e80 ff42371d57168345fdf1a3aac66a51f6a45d41d2 0000000000000000000000000000000000000000 bac16991d12ff45f9dc43c52da1946dfadb83e80 ff42371d57168345fdf1a3aac66a51f6a45d41d2 99
63476832d8ec6558cf9bbe3cbe0c757e5cf18043 700b7e19db54103633c4bf4a6a6b6d55f4d50c03 0000000000000000000000000000000000000000 63476832d8ec6558cf9bbe3cbe0c757e5cf18043 bac16991d12ff45f9dc43c52da1946dfadb83e80 102
13c0170174366b441dc68e8e33757232fa744458 63476832d8ec6558cf9bbe3cbe0c757e5cf18043 0000000000000000000000000000000000000000 13c0170174366b441dc68e8e33757232fa744458 63476832d8ec6558cf9bbe3cbe0c757e5cf18043 102
manifest
dac7984588fc4eea7acbf39693a9c1b06f5b175d 591f732a3faf1fb903815273f3c199a514a61ccb 0000000000000000000000000000000000000000 ff42371d57168345fdf1a3aac66a51f6a45d41d2 591f732a3faf1fb903815273f3c199a514a61ccb 113
0772616e6b48a76afb6c1458e193cbb3dae2e4ff dac7984588fc4eea7acbf39693a9c1b06f5b175d 0000000000000000000000000000000000000000 bac16991d12ff45f9dc43c52da1946dfadb83e80 dac7984588fc4eea7acbf39693a9c1b06f5b175d 113
eb498cd9af6c44108e43041e951ce829e29f6c80 bff2f4817ced57b386caf7c4e3e36a4bc9af7e93 0000000000000000000000000000000000000000 63476832d8ec6558cf9bbe3cbe0c757e5cf18043 0772616e6b48a76afb6c1458e193cbb3dae2e4ff 295
b15709c071ddd2d93188508ba156196ab4f19620 eb498cd9af6c44108e43041e951ce829e29f6c80 0000000000000000000000000000000000000000 13c0170174366b441dc68e8e33757232fa744458 eb498cd9af6c44108e43041e951ce829e29f6c80 114
mf
4f73f97080266ab8e0c0561ca8d0da3eaf65b695 301ca08d026bb72cb4258a9d211bdf7ca0bcd810 0000000000000000000000000000000000000000 ff42371d57168345fdf1a3aac66a51f6a45d41d2 301ca08d026bb72cb4258a9d211bdf7ca0bcd810 17
c7b583de053293870e145f45bd2d61643563fd06 4f73f97080266ab8e0c0561ca8d0da3eaf65b695 0000000000000000000000000000000000000000 bac16991d12ff45f9dc43c52da1946dfadb83e80 4f73f97080266ab8e0c0561ca8d0da3eaf65b695 18
266ee3c0302a5a18f1cf96817ac79a51836179e9 edc0f6b8db80d68ae6aff2b19f7e5347ab68fa63 0000000000000000000000000000000000000000 63476832d8ec6558cf9bbe3cbe0c757e5cf18043 c7b583de053293870e145f45bd2d61643563fd06 149
698c6a36220548cd3903ca7dada27c59aa500c52 266ee3c0302a5a18f1cf96817ac79a51836179e9 0000000000000000000000000000000000000000 13c0170174366b441dc68e8e33757232fa744458 266ee3c0302a5a18f1cf96817ac79a51836179e9 19
nf11
33fbc651630ffa7ccbebfe4eb91320a873e7291c 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 63476832d8ec6558cf9bbe3cbe0c757e5cf18043 0000000000000000000000000000000000000000 16
nf12
ddce0544363f037e9fb889faca058f52dc01c0a5 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 13c0170174366b441dc68e8e33757232fa744458 0000000000000000000000000000000000000000 16
nf4
3c1407305701051cbed9f9cb9a68bdfb5997c235 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 ff42371d57168345fdf1a3aac66a51f6a45d41d2 0000000000000000000000000000000000000000 15
nf5
0dbd89c185f53a1727c54cd1ce256482fa23968e 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 bac16991d12ff45f9dc43c52da1946dfadb83e80 0000000000000000000000000000000000000000 15
Verify we hit the HTTP server:
$ cat access.log
* - - [*] "GET /?cmd=capabilities HTTP/1.1" 200 - (glob)
$LOCALIP - - [$LOGDATE$] "GET /?cmd=getbundle HTTP/1.1" 200 - x-hgproto-1:0.1 0.2 comp=$USUAL_COMPRESSIONS$ (glob)
* - - [*] "GET /?cmd=capabilities HTTP/1.1" 200 - (glob)
$LOCALIP - - [$LOGDATE$] "GET /?cmd=getbundle HTTP/1.1" 200 - x-hgarg-1:common=700b7e19db54103633c4bf4a6a6b6d55f4d50c03+d5f6e1ea452285324836a49d7d3c2a63cfed1d31&heads=13c0170174366b441dc68e8e33757232fa744458+bac16991d12ff45f9dc43c52da1946dfadb83e80 x-hgproto-1:0.1 0.2 comp=$USUAL_COMPRESSIONS$ (glob)
$ cat error.log