MANIFEST.MF seems refreshed when gradle build runs more than once

[hkurokawa]

When I run ./gradlew build command more than once, the MANIFEST.MF is refreshed and it looses build information. I had to fix it to remove .gradle directory.

It seems this behaviour might be related to generateBuildInfo task is skipped when it is up-to-date.

Environment

OS: Ubuntu 16.04.2 LTS (x86_64)

$ ./gradlew -v

------------------------------------------------------------
Gradle 2.11
------------------------------------------------------------

Build time:   2016-02-08 07:59:16 UTC
Build number: none
Revision:     584db1c7c90bdd1de1d1c4c51271c665bfcba978

Groovy:       2.4.4
Ant:          Apache Ant(TM) version 1.9.3 compiled on December 23 2013
JVM:          1.8.0_131 (Oracle Corporation 25.131-b11)
OS:           Linux 4.4.0-97-generic amd64

Steps to reproduce

1. Clone this repository
2. Change the current directory to samples/example
3. Run ./gradlew build && unzip -p build/libs/example.jar META-INF/MANIFEST.MF
4. Run ./gradlew build && unzip -p build/libs/example.jar META-INF/MANIFEST.MF again
5. Remove directory .gradle with rm -rf .gradle/*
6. Run ./gradlew build && unzip -p build/libs/example.jar META-INF/MANIFEST.MF again

Result

At step 3, the build information was shown.

:compileJava
:processResources UP-TO-DATE
:generateBuildInfo
:classes
:jar
:assemble
:compileTestJava UP-TO-DATE
:processTestResources UP-TO-DATE
:testClasses UP-TO-DATE
:test UP-TO-DATE
:check UP-TO-DATE
:build

BUILD SUCCESSFUL

Total time: 3.626 secs

This build could be faster, please consider using the Gradle Daemon: https://docs.gradle.org/2.11/userguide/gradle_daemon.html
Manifest-Version: 1.0
Git-Branch: master
Git-Commit: e1f11e6
Git-Committer-Date: 2016-12-20 00:05:55 +0900
Build-Date: 2017-11-11 12:20:58 +0900
Build-Java-Version: 1.8.0_131
Build-Java-Vendor: Oracle Corporation
Build-Os-Name: Linux
Build-Os-Version: 4.4.0-97-generic

However, at step 4, the information was lost.

:compileJava UP-TO-DATE
:processResources UP-TO-DATE
:generateBuildInfo UP-TO-DATE
:classes UP-TO-DATE
:jar
:assemble
:compileTestJava UP-TO-DATE
:processTestResources UP-TO-DATE
:testClasses UP-TO-DATE
:test UP-TO-DATE
:check UP-TO-DATE
:build

BUILD SUCCESSFUL

Total time: 2.958 secs

This build could be faster, please consider using the Gradle Daemon: https://docs.gradle.org/2.11/userguide/gradle_daemon.html
Manifest-Version: 1.0

And at step 5, the build information was back.

:compileJava
:processResources UP-TO-DATE
:generateBuildInfo
:classes
:jar
:assemble
:compileTestJava UP-TO-DATE
:processTestResources UP-TO-DATE
:testClasses UP-TO-DATE
:test UP-TO-DATE
:check UP-TO-DATE
:build

BUILD SUCCESSFUL

Total time: 3.498 secs

This build could be faster, please consider using the Gradle Daemon: https://docs.gradle.org/2.11/userguide/gradle_daemon.html
Manifest-Version: 1.0
Git-Branch: master
Git-Commit: e1f11e6
Git-Committer-Date: 2016-12-20 00:05:55 +0900
Build-Date: 2017-11-11 12:33:37 +0900
Build-Java-Version: 1.8.0_131
Build-Java-Vendor: Oracle Corporation
Build-Os-Name: Linux
Build-Os-Version: 4.4.0-97-generic