trying to not have all travis builds show "dirty"

.travis.yml

@@ -35,8 +35,9 @@ before_install:
 - sudo apt-get -qq update
 - sudo apt-get install -y python3-lxml imagemagick
 script:
+- GITREV="$(git describe --tags --dirty)"
 - sed -i -e '/\/\/ rm-for-fdroid$/d' {.,app}/build.gradle
-- ./gradlew asXw4dDeb
+- ./gradlew asXw4dDeb -PGITREV="$GITREV"
 - scp -o "StrictHostKeyChecking no" -i /tmp/id_rsa_uploader -d app/build/outputs/apk/*/debug/*.apk
   uploader@eehouse.org:XW4D_UPLOAD
 notifications:

xwords4/android/app/build.gradle

@@ -37,11 +37,9 @@ boolean forFDroid = hasProperty('forFDroid')
 // Get the git revision we're using. Since fdroid modifies files as
 // part of its build process -dirty will always be added, confusing
 // users. So add that for the non-fdroid case.
-def GITREV = "git describe --tags"
-if (! forFDroid) {
-    GITREV += " --dirty"
+if (! project.hasProperty('GITREV')) {
+    ext.GITREV = 'git describe --tags --dirty'.execute().text.trim()
 }
-GITREV = GITREV.execute().text.trim()
 def GITREV_SHORT = "git rev-parse --short HEAD".execute().text.trim()
 
 // Make CURTAG non-empty IFF we're at a tag (release build)