Merge branch 'fix-script' into 2.8.x

Author: paulp

tools/get-scala-revision

@@ -2,23 +2,40 @@
 #
 # Usage: get-scala-revision [dir]
 # Figures out current scala revision of a git clone.
-#
 # If no dir is given, current working dir is used.
+#
+# Example build version string:
+#   v2.10.0-M1-0098-g6f1c486d0b-2012-02-01
+#
+
+[[ $# -eq 0 ]] || cd "$1"
+
+ensure_tag () {
+  sha=$1
+  rev=$2
+  
+  [[ -n $(git tag -l $rev) ]] || {
+    git tag -a -m "generated by get-scala-revision" $rev $sha
+  }
+}
+
+# Ensure some baseline tags are present so if this repository's
+# tags are screwed up or stale, we should still have a reference
+# point for a build string.
+ensure_tag 58cb15c40d v2.10.0-M1
+ensure_tag 29f3eace1e v2.9.1
+ensure_tag b0d78f6b9c v2.8.2
 
-# not like releases come out so often that we are duty-bound
-# to recalculate this every time.
-# git merge-base v2.8.2 v2.9.1 master
-devbase="df13e31bbb"
+# the closest tag, obtained separately because we have to
+# reconstruct the string around the padded distance.
+tag=$(git describe --tags --match 'v2*' --abbrev=0)
 
-# reimplementing git describe hopefully in a way which works
-# without any particular tags, branches, or recent versions of git.
-# this is supposed to generate
-#     dev-NNNN-g<sha>
-# where NNNN is the number of commits since devbase, which
-# is the merge-base of the most recent release and master.
-# Presently hardcoded to reduce uncertainty, v2.8.2/v2.9.1/master.
-commits=$(git --no-pager log --pretty=oneline $devbase..HEAD | wc -l)
-sha=$(git rev-list -n 1 HEAD)
-datestr=$(date "+%Y-%m-%d")
+# printf %016s is not portable for 0-padding, has to be a digit.
+# so we're stuck disassembling it.
+described=$(git describe --tags --match 'v2*' --abbrev=10)
+suffix="${described##${tag}-}"
+counter=$(echo $suffix | cut -d - -f 1)
+hash=$(echo $suffix | cut -d - -f 2)
 
-printf "rdev-%s-%s-g%s\n" $commits $datestr ${sha:0:7}
+# v2.10.0-M1-0098-g6f1c486d0b-2012-02-01
+printf "%s-%04d-%s-%s\n" "$tag" "$counter" "$hash" $(date "+%Y-%m-%d")