post-update script to update wc - version 2

[Sam Vilain <samv@xxxxxxxxxxx>]

#!/bin/sh
#
# An example hook script to prepare a packed repository for use over
# dumb transports.
#
# To enable this hook, make this file executable by "chmod +x post-update".

git-update-server-info

export GIT_DIR=`cd $GIT_DIR; pwd`
[ `expr "$GIT_DIR" : '.*/\.git'` = 0 ] && exit 0

tree_in_revlog() {
    ref=$1
    tree=$2
    found=$(
    tail logs/$ref | while read commit rubbish
    do
        this_tree=`git-cat-file commit $commit | awk '/^tree/ { print $2; exit }'`
	if [ "$this_tree" = "$tree" ]
        then
	    echo $commit
        fi
    done
    )
    [ -n "$found" ] && true
}

for ref
do
active=`git-symbolic-ref HEAD`
if [ "$ref" = "$active" ]
then
  echo "Pushing to checked out branch - updating working copy" >&2
  success=
  if ! (cd ..; git-diff-files) | grep -q .
  then
    # save the current index just in case
    current_tree=`git-write-tree`
    if tree_in_revlog $ref $current_tree
    then
      cd ..
      if git-diff-index -R --name-status HEAD >&2 &&
         git-diff-index -z --name-only --diff-filter=A HEAD | xargs -0r rm &&
         git-reset --hard HEAD
      then
         success=1
      else
        echo "E:unexpected error during update" >&2
      fi
    else
      echo "E:uncommitted, staged changes found" >&2
    fi
  else
    echo "E:unstaged changes found" >&2
  fi

  if [ -z "$success" ]
  then
    (
    echo "Non-bare repository checkout is not clean - not updating it"
    echo "However I AM going to update the index.  Any half-staged commit"
    echo "in that checkout will be thrown away, but on the bright side"
    echo "this is probably the least confusing thing for us to do and at"
    echo "least we're not throwing any files somebody has changed away"
    git-reset --mixed HEAD
    echo 
    echo "This is the new status of the upstream working copy:"
    git-status
    ) >&2
  fi
fi
done
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