Disable tag driven release of the distribution

The bootstrap script is called within PR validation
and nightly builds, in addition to being used in the
release process.

It used to try to to automatically determine which
of these contexts was active based on the whether
HEAD was suitable tagged.

However, if same commit was rebuilt later as a nightly,
new binaries would be created and overwrite the official
ones.

This commit removes this logic. `SCALA_VER_BASE=...` or `publishToSonatype=yes` will need to be explicitly
provided in then environment to trigger publication.

Author: retronym

scripts/jobs/integrate/bootstrap

@@ -14,9 +14,7 @@
 
 # Specifying the Scala version:
 #  - To build a release (this enables publishing to sonatype):
-#    - Either specify SCALA_VER_BASE. You may also specify SCALA_VER_SUFFIX, the Scala version is SCALA_VER=$SCALA_VER_BASE$SCALA_VER_SUFFIX.
-#    - Or have the current HEAD tagged as v$base$suffix
-#    - To prevent staging on sonatype (for testing), set publishToSonatype to anything but "yes"
+#    - Specify SCALA_VER_BASE. You may also specify SCALA_VER_SUFFIX, the Scala version is SCALA_VER=$SCALA_VER_BASE$SCALA_VER_SUFFIX.
 #    - Note: After building a release, the jenkins job provides an updated versions.properties file as artifact.
 #      Put this file in the Scala repo and create a pull request, also update `baseVersion in Global` in build.sbt.
 #
@@ -285,31 +283,11 @@ determineScalaVersion() {
   if [ -z "$SCALA_VER_BASE" ]; then
     echo "No SCALA_VER_BASE specified."
 
-    scalaTag=$(git describe --tag --exact-match ||:)
-
-    if [ -z "$scalaTag" ]
-    then
-      echo "No tag found, running an integration build."
-      $SBT_CMD $sbtArgs 'set baseVersionSuffix in Global := "SHA"' generateBuildCharacterPropertiesFile
-      parseScalaProperties "buildcharacter.properties"
-      SCALA_VER_BASE="$maven_version_base"
-      SCALA_VER_SUFFIX="$maven_version_suffix"
-
-      # TODO: publish nightly snapshot using this script - currently it's a separate jenkins job still running at EPFL.
-      publishToSonatype="no"
-    else
-      echo "HEAD is tagged as $scalaTag."
-      # borrowed from https://github.com/cloudflare/semver_bash/blob/master/semver.sh
-      local RE='v*\([0-9]*\)[.]\([0-9]*\)[.]\([0-9]*\)\([0-9A-Za-z-]*\)' # don't change this to make it more accurate, it's not worth it
-      SCALA_VER_BASE="$(echo $scalaTag | sed -e "s#$RE#\1.\2.\3#")"
-      SCALA_VER_SUFFIX="$(echo $scalaTag | sed -e "s#$RE#\4#")"
-
-      if [ "$SCALA_VER_BASE" == "$scalaTag" ]; then
-        echo "Could not parse version $scalaTag"
-        exit 1
-      fi
-      publishToSonatype=${publishToSonatype-"yes"} # unless forced previously, publish
-    fi
+    $SBT_CMD $sbtArgs 'set baseVersionSuffix in Global := "SHA"' generateBuildCharacterPropertiesFile
+    parseScalaProperties "buildcharacter.properties"
+    SCALA_VER_BASE="$maven_version_base"
+    SCALA_VER_SUFFIX="$maven_version_suffix"
+    publishToSonatype="no"
   else
     publishToSonatype=${publishToSonatype-"yes"} # unless forced previously, publish
   fi