http://systemoverlord.com/blog/2011/07/16/automatically-creating-archives-git-tags

gistfile1.sh

#!/bin/bash
# post-receive gitolite hook to produce archives
 
# Debug mode
DEBUG=1
 
# Where to put archives
ARCHIVE_DIR=/srv/archives/
 
# When to allow archiving (regex)
ALLOW_ARCHIVE="^(drupal|moodle)"
 
#### NO CONFIG BELOW ####
# Check if this repo can be archived
if [[ ! "$GL_REPO" =~ $ALLOW_ARCHIVE ]] ; then
    [[ $DEBUG ]] && echo "Archiving for this repository is disabled." 
    exit 0
fi
 
# Get repo name
ARCHIVE_DIR="${ARCHIVE_DIR}/${GL_REPO}"
 
while read rev1 rev2 ref ; do
    if [[ ! "$ref" =~ ^refs/tags ]] ; then
        [[ $DEBUG ]] && echo "Not a tag reference..."
        continue
    fi
 
    # Get tag name
    tag=${ref##*/}
 
    # Check if tag contains alpha, beta, or release:
    if [[ ! $tag =~ (alpha|beta|release) ]] ; then
        [[ $DEBUG ]] && echo "Not alpha/beta/release"
        continue
    fi
 
    # Ensure directory exists
    mkdir -p ${ARCHIVE_DIR}
 
    # Repo base name
    REPO_BASE=${GL_REPO##*/}
 
    # Make archive
    [[ $DEBUG ]] && echo git archive --format=zip --prefix=${REPO_BASE}/ -o "${ARCHIVE_DIR}/$tag.zip" $ref
    git archive --format=zip --prefix=${REPO_BASE}/ -o "${ARCHIVE_DIR}/$tag.zip" $ref
done