support debug builds from branchs or a tag

scripts/make.mysql.debug.env.bash

 #!/usr/bin/env bash
 
 function usage() {
-    echo "generate a script that builds a debug mysql from subversion"
+    echo "generate a script that builds a debug mysql from github repo's"
+    echo "--git_tag=$git_tag"
+    echo "--mysql=$mysql --mysql_branch=$mysql_branch"
+    echo "--jemalloc=$jemalloc --jemalloc_branch=$jemalloc_branch"
+    echo "--ftengine=$ftengine --ftengine_branch=$ftengine_branch"
+    echo "--ftindex=$ftindex --ftindex_branch=$ftindex_branch"
+    echo "--backup=$backup --backup_branch=$backup_branch"
+}
+
+function github_clone() {
+    local repo=$1; local branch=$2
+    echo git clone git@github.com:Tokutek/$repo
+    echo 'if [ $? != 0 ] ; then exit 1; fi'
+    echo pushd $repo
+    echo 'if [ $? != 0 ] ; then exit 1; fi'
+    if [ -z $git_tag ] ; then
+        echo git checkout $branch
+    else
+        echo git checkout $git_tag
+    fi
+    echo 'if [ $? != 0 ] ; then exit 1; fi'
+    echo popd
 }
 
 shopt -s compat31 2>/dev/null
 
+git_tag=
+mysql=mysql
+mysql_branch=5.5.30
+jemalloc=jemalloc
+jemalloc_branch=3.3.1
+ftengine=ft-engine
+ftengine_branch=master
+ftindex=ft-index
+ftindex_branch=master
+backup=backup-community
+backup_branch=master
+
 while [ $# -ne 0 ] ; do
     arg=$1; shift
     if [[ $arg =~ --(.*)=(.*) ]] ; then
@@ -21,44 +54,47 @@ echo installdir=\$PWD/mysql
 echo mkdir \$builddir \$installdir
 echo 'if [ $? != 0 ] ; then exit 1; fi'
 
-echo export TOKUFRACTALTREE=\$builddir/ft-index/install.debug
+echo export TOKUFRACTALTREE=\$builddir/$ftindex/install.debug
 echo export TOKUFRACTALTREE_LIBNAME=tokudb
 echo export TOKUPORTABILITY_LIBNAME=tokuportability
 echo export TOKUDB_VERSION=0
 
 echo '# checkout the fractal tree'
 echo cd \$builddir
-echo git clone git@github.com:Tokutek/jemalloc
-echo 'if [ $? != 0 ] ; then exit 1; fi'
-echo git clone git@github.com:Tokutek/ft-index
-echo 'if [ $? != 0 ] ; then exit 1; fi'
+github_clone $jemalloc $jemalloc_branch
+github_clone $ftindex $ftindex_branch
 
 echo '# build the fractal tree'
 echo cd \$builddir/ft-index
 echo mkdir build.debug
 echo cd build.debug
-echo CC=gcc47 CXX=g++47 cmake -DCMAKE_INSTALL_PREFIX=\$TOKUFRACTALTREE -D BUILD_TESTING=OFF -D CMAKE_BUILD_TYPE=Debug -D JEMALLOC_SOURCE_DIR=\$builddir/jemalloc ..
+echo CC=gcc47 CXX=g++47 cmake -DCMAKE_INSTALL_PREFIX=\$TOKUFRACTALTREE -D BUILD_TESTING=OFF -D CMAKE_BUILD_TYPE=Debug -D JEMALLOC_SOURCE_DIR=\$builddir/$jemalloc ..
 echo 'if [ $? != 0 ] ; then exit 1; fi'
 echo make install
 echo 'if [ $? != 0 ] ; then exit 1; fi'
 
 echo '# checkout mysql'
 echo cd \$builddir
-echo git clone git@github.com:Tokutek/mysql
-echo 'if [ $? != 0 ] ; then exit 1; fi'
+github_clone $mysql $mysql_branch
 
 echo '# checkout the community backup'
 echo cd \$builddir
-echo git clone git@github.com:Tokutek/backup-community
-echo 'if [ $? != 0 ] ; then exit 1; fi'
+github_clone $backup $backup_branch
 
 echo '# checkout the tokudb handlerton'
 echo cd \$builddir
-echo git clone git@github.com:Tokutek/ft-engine
-echo 'if [ $? != 0 ] ; then exit 1; fi'
+github_clone $ftengine $ftengine_branch
 
-echo 'pushd mysql/storage; ln -s ../../ft-engine/storage/tokudb tokudb; popd'
-echo 'pushd mysql; ln -s ../backup-community/backup toku_backup; popd'
+echo "pushd $mysql/storage"
+echo 'if [ $? != 0 ] ; then exit 1; fi'
+echo "ln -s ../../$ftengine/storage/tokudb tokudb"
+echo 'if [ $? != 0 ] ; then exit 1; fi'
+echo popd
+echo "pushd $mysql"
+echo 'if [ $? != 0 ] ; then exit 1; fi'
+echo "ln -s ../$backup/backup toku_backup"
+echo 'if [ $? != 0 ] ; then exit 1; fi'
+echo popd
 
 echo '# build in the mysql directory'
 echo cd \$builddir/mysql