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#!/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)
# $4: output file
# And this environment:
# GIT : the git command to call
# BUILD_DIR: path to Buildroot's build dir
repo="${1}"
cset="${2}"
basename="${3}"
output="${4}"
repodir="${basename}.tmp-git-checkout"
tmp_tar="$( mktemp "${BUILD_DIR}/.XXXXXX" )"
tmp_output="$( mktemp "${output}.XXXXXX" )"
# Play tic-tac-toe with temp files
# - first, we download to a trashable location (the build-dir)
# - then we create the uncomporessed tarball in tht same trashable location
# - then we create a temporary compressed tarball in the final location, so
# it is on the same filesystem as the final file
# - finally, we atomically rename to the final file
cd "${BUILD_DIR}"
# Remove leftovers from a previous failed run
rm -rf "${repodir}"
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}" "${repodir}"
fi
ret=1
pushd "${repodir}" >/dev/null
if ${GIT} archive --prefix="${basename}/" -o "${tmp_tar}" \
--format=tar "${cset}"; then
if gzip -c "${tmp_tar}" >"${tmp_output}"; then
mv "${tmp_output}" "${output}"
ret=0
fi
fi
popd >/dev/null
rm -rf "${repodir}" "${tmp_tar}" "${tmp_output}"
exit ${ret}
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