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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] [-r] OUT_FILE REPO_URL CSET BASENAME
#
# -q Be quiet.
# -r Clone and archive sub-modules.
#
# Environment:
# GIT : the git command to call
verbose=
recurse=0
while getopts :qr OPT; do
case "${OPT}" in
q) verbose=-q; exec >/dev/null;;
r) recurse=1;;
\?) printf "unknown option '%s'
" "${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
"
if _git clone ${verbose} --depth 1 -b "'${cset}'" "'${repo}'" "'${basename}'"; then
git_done=1
else
printf "Shallow clone failed, falling back to doing a full clone
"
fi
fi
if [ ${git_done} -eq 0 ]; then
printf "Doing full clone
"
_git clone ${verbose} "'${repo}'" "'${basename}'"
fi
pushd "${basename}" >/dev/null
# Try to get the special refs exposed by some forges (pull-requests for
# github, changes for gerrit...). There is no easy way to know whether
# the cset the user passed us is such a special ref or a tag or a sha1
# or whatever else. We'll eventually fail at checking out that cset,
# below, if there is an issue anyway. Since most of the cset we're gonna
# have to clone are not such special refs, consign the output to oblivion
# so as not to alarm unsuspecting users, but still trace it as a warning.
if ! _git fetch origin "'${cset}:${cset}'" >/dev/null 2>&1; then
printf "Could not fetch special ref '%s'; assuming it is not special.
" "${cset}"
fi
# Checkout the required changeset, so that we can update the required
# submodules.
_git checkout -q "'${cset}'"
# Get date of commit to generate a reproducible archive.
# %cD is RFC2822, so it's fully qualified, with TZ and all.
date="$( _git log -1 --pretty=format:%cD )"
# There might be submodules, so fetch them.
if [ ${recurse} -eq 1 ]; then
_git submodule update --init --recursive
fi
# We do not need the .git dir; we keep other .git files, in case they
# are the only files in their directory.
rm -rf .git
popd >/dev/null
# Generate the archive, sort with the C locale so that it is reproducible
tar cf - --numeric-owner --owner=0 --group=0 --mtime="${date}" \
-T <(find "${basename}" -not -type d |LC_ALL=C sort) \
|gzip -n >"${output}"
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