pre-commit and post-checkout hook to save permissions (https://stackoverflow.com/questions/3207728/retaining-file-permissions-with-git)

post-checkout

#!/bin/bash

SELF_DIR=`git rev-parse --show-toplevel`
DATABASE=$SELF_DIR/.permissions

echo -n "Restoring file permissions..."

IFS_OLD=$IFS; IFS=$'\n'
while read -r LINE || [[ -n "$LINE" ]];
do
   FILE=`echo $LINE | cut -d ";" -f 1`
   PERMISSIONS=`echo $LINE | cut -d ";" -f 2`
   USER=`echo $LINE | cut -d ";" -f 3`
   GROUP=`echo $LINE | cut -d ";" -f 4`

   # Set the file permissions
   chmod $PERMISSIONS $FILE

   # Set the file owner and groups
   chown $USER:$GROUP $FILE

done < $DATABASE
IFS=$IFS_OLD

echo "OK"

exit 0

pre-commit

#!/bin/bash
#
# A hook script called by "git commit" with no arguments. The hook should
# exit with non-zero status after issuing an appropriate message if it wants
# to stop the commit.

SELF_DIR=`git rev-parse --show-toplevel`
DATABASE=$SELF_DIR/.permissions

# Clear the permissions database file
> $DATABASE

echo -n "Backing-up file permissions..."

IFS_OLD=$IFS; IFS=$'\n'
for FILE in `git ls-files`
do
   # Save the permissions of all the files in the index
   echo $FILE";"`stat -c "%a;%U;%G" $FILE` >> $DATABASE
done
IFS=$IFS_OLD

# Add the permissions database file to the index
git add $DATABASE

echo "OK"