Use git-describe to create build string.

Created dev tag which is the merge-base of master and 2.9.1 (merge-base
is the last common commit), and told ant to generate build strings based
on that. So distributions look like

  scala-2.10.0.dev-1289-gbba3918

Where the 1289 means you are 1289 commits ahead of "dev" and
the last segment (minus the g) is the sha-1 hash.

This no doubt breaks windows even further.  Help getting it
back on its feet greatly appreciated.

Author: paulp

build.xml

@@ -232,21 +232,22 @@ INITIALISATION
       <os family="windows"/>
     </condition>
 
-    <exec osfamily="unix" executable="tools/get-scala-revision" outputproperty="svn.number" failifexecutionfails="false" />
-    <exec osfamily="windows" executable="tools/get-scala-revision.bat" outputproperty="svn.number" failifexecutionfails="false" />
+    <exec osfamily="unix" executable="tools/get-scala-revision" outputproperty="git.describe" failifexecutionfails="false" />
+    <exec osfamily="windows" executable="tools/get-scala-revision.bat" outputproperty="git.describe" failifexecutionfails="false" />
     <!-- some default in case something went wrong getting the revision -->
-    <property name="svn.number" value="0"/>
+    <property name="git.describe" value="-unknown-"/>
 
     <property name="init.avail" value="yes"/>
 
     <!-- Generating version number -->
     <property file="${basedir}/build.number"/>
     <property
       name="version.number"
-      value="${version.major}.${version.minor}.${version.patch}.r${svn.number}-b${time.short}"/>
+      value="${version.major}.${version.minor}.${version.patch}.${git.describe}"/>
+      
     <!-- And print-out what we are building -->
     <echo level="info" message="Build number is '${version.number}'"/>
-    <echo level="info" message="Built ${time.human} from revision ${svn.number} with ${java.vm.name} ${java.version}"/>
+    <echo level="info" message="Built ${time.human} from revision ${git.describe} with ${java.vm.name} ${java.version}"/>
 
     <!-- Local libs (developer use.) -->
     <mkdir dir="${lib-extra.dir}"/>

tools/get-scala-revision

@@ -1,30 +1,12 @@
 #!/bin/sh
 #
 # Usage: get-scala-revision [dir]
-# Figures out current scala revision of an svn checkout or
-# a git-svn mirror (or a git clone.)
+# Figures out current scala revision of a git clone.
 #
 # If no dir is given, current working dir is used.
 
-DIR=""
-if [ $# -eq 0 ]; then
-  DIR=`pwd`
-else
-  DIR=$1
-fi
+[[ -n "$1" ]] && cd "$1"
 
-cd $DIR
-
-if [ -d .svn ]; then
-  # 2>&1 to catch also error output (e.g. svn warnings)
-  svn info . 2>&1 | grep ^Revision | sed 's/Revision: //'
-elif [ -d .git ]; then
-  GIT_PAGER=cat
-  # this grabs more than one line because otherwise if you have local
-  # commits which aren't in git-svn it won't see any revision.
-  git log -10 | grep git-svn-id | head -1 | sed 's/[^@]*@\([0-9]*\).*/\1/'
-else
-  echo "${DIR} doesn't appear to be git or svn dir." >&2
-  echo 0
-  exit 1
-fi
+# dev should be a tag at the merge-base of master and the
+# most recent release.
+git describe head --abbrev=7 --match dev

tools/get-scala-revision.bat

@@ -1,17 +1,11 @@
 @echo off
 rem
 rem Usage: get-scala-revison.bat [dir]
-rem Figures out current scala revision of an svn checkout or
-rem a git-svn mirror (or a git clone.)
+rem Figures out current scala revision of a git clone.
 rem
 rem If no dir is given, current working dir is used.
 
-if "%OS%" NEQ "Windows_NT" (
-  echo "Sorry, your version of Windows is too old to run Scala."
-  goto :eof
-)
 @setlocal
-
 set _DIR=
 if "%*"=="" (
   for /f "delims=;" %%i in ('cd') do set "_DIR=%%i"
@@ -20,23 +14,10 @@ if "%*"=="" (
 )
 cd %_DIR%
 
-if exist .svn\NUL (
-  rem 2>&1 to catch also error output (e.g. svn warnings)
-  for /f "skip=4 tokens=2" %%i in ('svn info') do (
-    echo %%i
-    goto :end
-  )
-) else ( if exist .git\NUL (
-  set _GIT_PAGER=type
-  rem this grabs more than one line because otherwise if you have local
-  rem commits which aren't in git-svn it won't see any revision.
-  rem TODO: git log -10 | findstr git-svn-id | ...
+if exist .git\NUL (
+  git describe head --abbrev=7 --match dev
   echo 0
-) else (
-  echo %_DIR% doesn't appear to be git or svn dir.
-  echo 0
-  exit 1
-))
+)
 
 :end
 @endlocal