reproducible builds: TASTY differences

[raboof]

reproducing 1.1.0-M1 with set ThisBuild / net.bzzt.reproduciblebuilds.ReproducibleBuildsPlugin.reproducibleBuildsCheckResolver := DefaultMavenRepository; ++3.3; clean; reproducibleBuildsCheck showed a nondeterminism for me in pekko-core_3-1.1.0-M1.jar :

In org/apache/pekko/http/scaladsl/model/HttpMessage.tasty there are small differences at lines 0x0000010, 0x00000020 and 0x00002d30:

<div class="diffheader"><div id="org-apache-pekko-http-scaladsl-model-HttpMessage.tasty"><span class="source">org/apache/pekko/http/scaladsl/model/HttpMessage.tasty</span>
      
    </div>
    </div>

Offset 1, 10 lines modified | Offset 1, 10 lines modified
-- | --
00000000:·5ca1·ab1f·9c83·808b·5363·616c·6120·332e··\.......Scala·3. | 00000000:·5ca1·ab1f·9c83·808b·5363·616c·6120·332e··\.......Scala·3.
00000010:·332e·3300·1e07·3cfd·e113·ee00·f50d·1e5b··3.3...<........[ | 00000010:·332e·3300·1e07·3cfd·e113·ee00·09c6·706e··3.3...<.......pn
00000020:·9b3b·2b21·d001·8441·5354·7301·836f·7267··.;+!...ASTs..org | 00000020:·f03c·2b21·d001·8441·5354·7301·836f·7267··.<+!...ASTs..org
00000030:·0186·6170·6163·6865·0282·8182·0185·7065··..apache......pe | 00000030:·0186·6170·6163·6865·0282·8182·0185·7065··..apache......pe
00000040:·6b6b·6f02·8283·8401·8468·7474·7002·8285··kko......http... | 00000040:·6b6b·6f02·8283·8401·8468·7474·7002·8285··kko......http...
00000050:·8601·8873·6361·6c61·6473·6c02·8287·8801··...scaladsl..... | 00000050:·8601·8873·6361·6c61·6473·6c02·8287·8801··...scaladsl.....
00000060:·856d·6f64·656c·0282·898a·0186·7374·7265··.model......stre | 00000060:·856d·6f64·656c·0282·898a·0186·7374·7265··.model......stre
00000070:·616d·0184·466c·6f77·0189·466c·6f77·5368··am..Flow..FlowSh | 00000070:·616d·0184·466c·6f77·0189·466c·6f77·5368··am..Flow..FlowSh
00000080:·6170·6501·8547·7261·7068·018c·4d61·7465··ape..Graph..Mate | 00000080:·6170·6501·8547·7261·7068·018c·4d61·7465··ape..Graph..Mate
00000090:·7269·616c·697a·6572·0192·5379·7374·656d··rializer..System | 00000090:·7269·616c·697a·6572·0192·5379·7374·656d··rializer..System
Offset 717, 15 lines modified | Offset 717, 15 lines modified
00002cc0:·fb80·9795·9580·9789·8680·9785·af87·9787··................ | 00002cc0:·fb80·9795·9580·9789·8680·9785·af87·9787··................
00002cd0:·fe99·93f5·9493·fb8b·93f7·8693·fb80·97a4··................ | 00002cd0:·fe99·93f5·9493·fb8b·93f7·8693·fb80·97a4··................
00002ce0:·a080·9782·a587·9787·fe8b·93ef·8693·fb80··................ | 00002ce0:·a080·9782·a587·9787·fe8b·93ef·8693·fb80··................
00002cf0:·979c·9880·9782·9187·9787·fe80·9788·8280··................ | 00002cf0:·979c·9880·9782·9187·9787·fe80·9788·8280··................
00002d00:·9783·a187·9787·f886·93f5·8097·9193·8097··................ | 00002d00:·9783·a187·9787·f886·93f5·8097·9193·8097··................
00002d10:·88a3·8797·87fe·9193·f786·93f5·8097·9a96··................ | 00002d10:·88a3·8797·87fe·9193·f786·93f5·8097·9a96··................
00002d20:·8097·00c1·0051·e58d·0234·818d·ba7f·2edb··.....Q...4...... | 00002d20:·8097·00c1·0051·e58d·0234·818d·ba7f·2edb··.....Q...4......
00002d30:·b001·a68d·8db0·00d8·8403·de00·c8b0·7d48··..............}H | 00002d30:·b000·de8d·8d84·03de·00c8·b001·a0b0·7d48··..............}H
00002d40:·9e94·0051·9600·da7f·2efe·a07f·a6ec·eca7··...Q............ | 00002d40:·9e94·0051·9600·da7f·2efe·a07f·a6ec·eca7··...Q............
00002d50:·94a2·8393·f480·00df·9300·cf85·9d8a·8096··................ | 00002d50:·94a2·8393·f480·00df·9300·cf85·9d8a·8096··................
00002d60:·83cf·abb1·8093·da80·bf8e·a485·9d8c·9193··................ | 00002d60:·83cf·abb1·8093·da80·bf8e·a485·9d8c·9193··................
00002d70:·fb80·8bfb·80af·9a9d·849d·8a80·00cf·889a··................ | 00002d70:·fb80·8bfb·80af·9a9d·849d·8a80·00cf·889a··................
00002d80:·849d·8f80·b78a·9a84·9d90·80af·8baa·849d··................ | 00002d80:·849d·8f80·b78a·9a84·9d90·80af·8baa·849d··................
00002d90:·8d80·93f4·8a93·fc80·978e·8f80·bf8e·ab84··................ | 00002d90:·8d80·93f4·8a93·fc80·978e·8f80·bf8e·ab84··................
00002da0:·9d90·8093·ec80·00cf·8490·8093·fd80·bf8d··................ | 00002da0:·9d90·8093·ec80·00cf·8490·8093·fd80·bf8d··................

org/apache/pekko/http/scaladsl/model/HttpEntity.tasty is also different, and here the differences are larger.

Filed scala/scala3#21154

[raboof]

(looks like this missed the train for 3.3.4 but will likely be backported to LTS in 3.3.5)

[raboof]

Looking at this again I'm not so sure we can expect all of this to be fixed in 3.3.5, but let's see.

We encountered it in the 1.1.0 release again: https://arnout.engelen.eu/reproducible-builds-diffoscope-output-pekko-http-core_3-1.1.0.jar/