#!/bin/bash

# We want to catch any command failure, and exit immediately
set -e

# Download helper for git
# Call it with:
#   $1: git repo
#   $2: git cset
#   $3: package's basename (eg. foobar-1.2.3)
#   $4: output file
# And this environment:
#   BR2_DL_DIR: path to Buildroot's download dir
#   GIT       : the git command to call

repo="${1}"
cset="${2}"
basename="${3}"
output="${4}"

repodir="${BR2_DL_DIR}/${basename}"

if [ -n "$(${GIT} ls-remote "${repo}" "${cset}" 2>&1)" ]; then
    printf "Doing shallow clone\n"
    ${GIT} clone --depth 1 -b "${cset}" --bare "${repo}" "${repodir}"
else
    printf "Doing full clone\n"
    ${GIT} clone --bare "${repo}" "${repodir}"
fi

pushd "${repodir}" >/dev/null
${GIT} archive --prefix="${basename}/" -o "${output}.tmp" --format=tar "${cset}"
gzip -c "${output}.tmp" >"${output}"
rm -f "${output}.tmp"
popd >/dev/null

rm -rf "${repodir}"