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#!/usr/bin/env bash
# We want to catch any unexpected failure, and exit immediately
set -e
# Download helper for git, to be called from the download wrapper script
#
# Call it as:
# .../git [-q] OUT_FILE REPO_URL CSET BASENAME
#
# Environment:
# GIT : the git command to call
verbose=
while getopts :q OPT; do
case "${OPT}" in
q) verbose=-q; exec >/dev/null;;
\?) printf "unknown option '%s'\n" "${OPTARG}" >&2; exit 1;;
esac
done
shift $((OPTIND-1))
output="${1}"
repo="${2}"
cset="${3}"
basename="${4}"
# Caller needs to single-quote its arguments to prevent them from
# being expanded a second time (in case there are spaces in them)
_git() {
eval ${GIT} "${@}"
}
# Try a shallow clone, since it is faster than a full clone - but that only
# works if the version is a ref (tag or branch). Before trying to do a shallow
# clone we check if ${cset} is in the list provided by git ls-remote. If not
# we fall back on a full clone.
#
# Messages for the type of clone used are provided to ease debugging in case of
# problems
git_done=0
if [ -n "$(_git ls-remote "'${repo}'" "'${cset}'" 2>&1)" ]; then
printf "Doing shallow clone\n"
if _git clone ${verbose} --depth 1 -b "'${cset}'" --bare "'${repo}'" "'${basename}'"; then
git_done=1
else
printf "Shallow clone failed, falling back to doing a full clone\n"
fi
fi
if [ ${git_done} -eq 0 ]; then
printf "Doing full clone\n"
_git clone ${verbose} --mirror "'${repo}'" "'${basename}'"
fi
GIT_DIR="${basename}" \
_git archive --prefix="'${basename}/'" -o "'${output}.tmp'" --format=tar "'${cset}'"
gzip -n <"${output}.tmp" >"${output}"
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