git-cms-sparse-checkout

#!/bin/sh -e
# Includes in .git/info/sparse-checkout a list of the packages
# which are modified between TAG1 and TAG2
case `uname` in 
  Darwin) ECHO=echo ;;
  *) ECHO="echo -e" ;;
esac
usage () {
  echo "git cms-sparse-checkout [options] TAG1 TAG2"
  echo
  echo "Options:"
  $ECHO "-h                 \tthis help message"
  $ECHO
  $ECHO "-d, --debug        \tenable debug output"
  exit $1
}

DEBUG=0
REF1=
REF2=
while [ "$#" != 0 ]; do
  case "$1" in
    -h | --help )
      usage 0;;
    -d|--debug)
      DEBUG=1
      shift
      ;;
    --exclude-cvs-keywords)
      REGEX='^([^$]+$|[^$]*[$][^$]*$|([^$]*[$])($|[^RAIDLNSH]|(R[^eC]|A[^u]|I[^d]|D[^a]|L[^o]|N[^a]|S[^o]|H[^e])|(Re[^v]|RC[^S]|Au[^t]|Id[^:]|Da[^t]|Lo[^g]|Na[^m]|So[^u]|He[^a])|(Rev[^i]|RCS[^f]|Aut[^h]|Dat[^e]|Log[^:]|Nam[^e]|Sou[^r]|Hea[^d])|(Revi[^s]|RCSf[^i]|Auth[^o]|Date[^:]|Name[^:]|Sour[^c]|Head[^e])|(Revis[^i]|RCSfi[^l]|Autho[^r]|Sourc[^e]|Heade[^r])|(Revisi[^o]|RCSfil[^e]|Author[^:]|Source[^:]|Header[^:])|(Revisio[^n]|RCSfile[^:])|(Revision[^:])))'
      REGEX_OPT="-G"
      shift
      ;;
    -G)
      REGEX_OPT="-G"
      REGEX="$2"; shift ; shift
      ;;
    -*)
      echo Unknown option $1 ; usage 1 ;;
    *)
      if [ "$REF1" == "" ]; then
        REF1="$1"
      elif [ "$REF2" = "" ]; then
        REF2="$1"
      else
        echo "Too many tags / branches specified." ; exit 1
      fi
      shift 1
    ;;
  esac
done

BASH_FULL_VERSION=$((${BASH_VERSINFO[0]} * 10000 + ${BASH_VERSINFO[1]} * 100 + ${BASH_VERSINFO[2]}))
if (( BASH_FULL_VERSION >= 40100 )); then
  # bash 4.1 or newer
  if [ $DEBUG == 0 ]; then
    # send debug messages to /dev/null
    exec {debug}> /dev/null
  else
    # send debug messages to stderr
    exec {debug}>&2
    # pass the debug option to subcommands
    DEBUG_OPT=-d
    # enable shell tracing
    set -x
  fi
else
  # bash 4.0 or older
  debug=12
  if [ $DEBUG == 0 ]; then
    # send debug messages to /dev/null
    exec 12> /dev/null
  else
    # send debug messages to stderr
    exec 12>&2
    # pass the debug option to subcommands
    DEBUG_OPT=-d
    # enable shell tracing
    set -x
  fi
fi

case `git --version` in 
  git\ version\ 1.7*)
    # git 1.7.x does not support a leading slash in .gitignore and .git/info/sparse-checkout
    LEADING_SLASH=
  ;;
  *)
    LEADING_SLASH=/
  ;;
esac

git config core.sparsecheckout true
INFO_DIR=`git rev-parse --show-toplevel`/.git/info/
touch $INFO_DIR/sparse-checkout
cp -f $INFO_DIR/sparse-checkout $INFO_DIR/sparse-checkout-new
for x in `git diff $REGEX_OPT $REGEX $REF1..$REF2 --name-only  --no-renames | grep -v ".gitconfig" | cut -f1,2 -d/ | sort -u`; do
  echo "$x" | sed -e "s|[/]*$|/|;s|^/*|${LEADING_SLASH}|" >> $INFO_DIR/sparse-checkout-new
done
for x in `git diff $REF1..$REF2 | grep '^old mode' -C 1 | grep '^diff --git' | sed -e 's|.* ||;s|b/||' | grep -v ".gitconfig" | cut -f1,2 -d/ | sort -u`; do
  echo "$x" | sed -e "s|[/][/]*$|/|;s|^/*|${LEADING_SLASH}|" >> $INFO_DIR/sparse-checkout-new
done

cat $INFO_DIR/sparse-checkout-new | sort -u > $INFO_DIR/sparse-checkout
rm -f $INFO_DIR/sparse-checkout-new