Eugene Yokota 628d908a5c packageTimestamp setting ... Fixes https://github.com/sbt/sbt/issues/6235 In sbt 1.4.0 (https://github.com/sbt/sbt/pull/5344) we started wiping out the timestamps in JAR to make the builds more repeatable. This had an unintended consequence of breaking Play's last-modified response header (https://github.com/playframework/playframework/issues/10572). This adds a global setting called `packageTimestamp`, which is initialized as follows: ```scala packageTimestamp :== Package.defaultTimestamp, ``` Here the `Package.defaultTimestamp` would pick either the value from the `SOURCE_DATE_EPOCH` environment variable or 2010-01-01. To opt out of this default, the user can use: ```scala ThisBuild / packageTimestamp := Package.keepTimestamps // or ThisBuild / packageTimestamp := Package.gitCommitDateTimestamp ``` Before (sbt 1.4.6) ------------------ ``` $ ll example total 32 -rw-r--r-- 1 eed3si9n wheel 901 Jan 1 1970 Greeting.class -rw-r--r-- 1 eed3si9n wheel 3079 Jan 1 1970 Hello$.class -rw-r--r-- 1 eed3si9n wheel 738 Jan 1 1970 Hello$delayedInit$body.class -rw-r--r-- 1 eed3si9n wheel 875 Jan 1 1970 Hello.class ``` After (using Package.gitCommitDateTimestamp) -------------------------------------------- ``` $ unzip -v target/scala-2.13/root_2.13-0.1.0-SNAPSHOT.jar Archive: target/scala-2.13/root_2.13-0.1.0-SNAPSHOT.jar Length Method Size Cmpr Date Time CRC-32 Name -------- ------ ------- ---- ---------- ----- -------- ---- 288 Defl:N 136 53% 01-25-2021 03:09 888682a9 META-INF/MANIFEST.MF 0 Stored 0 0% 01-25-2021 03:09 00000000 example/ 901 Defl:N 601 33% 01-25-2021 03:09 3543f377 example/Greeting.class 3079 Defl:N 1279 59% 01-25-2021 03:09 848b4386 example/Hello$.class 738 Defl:N 464 37% 01-25-2021 03:09 571f4288 example/Hello$delayedInit$body.class 875 Defl:N 594 32% 01-25-2021 03:09 ad295259 example/Hello.class -------- ------- --- ------- 5881 3074 48% 6 files ```		2021-01-24 22:14:31 -05:00
..
main/scala/sbt	packageTimestamp setting	2021-01-24 22:14:31 -05:00
test/scala/sbt	Bump scalafmt	2019-07-18 12:40:21 -07:00