scripts/download_extract_git-lfs.sh

#!/bin/bash
source scripts/utils.sh echo -n

# Saner programming env: these switches turn some bugs into errors
set -o errexit -o pipefail

# this script is meant to be used with 'datalad run'

# Download git-lfs
_VERSION=v2.13.3

mkdir -p bin/git-lfs-linux-amd64-${_VERSION}
rm -f bin/sha256sums
echo "03197488f7be54cfc7b693f0ed6c75ac155f5aaa835508c64d68ec8f308b04c1  git-lfs-linux-amd64-${_VERSION}.tar.gz" > bin/sha256sums

files_url=(
	"https://github.com/git-lfs/git-lfs/releases/download/${_VERSION}/git-lfs-linux-amd64-${_VERSION}.tar.gz bin/git-lfs-linux-amd64-${_VERSION}.tar.gz")

git-annex addurl --fast -c annex.largefiles=anything --raw --batch --with-files <<EOF
$(for file_url in "${files_url[@]}" ; do echo "${file_url}" ; done)
EOF
# Downloads should complete correctly but in multiprocesses the last git-annex
# step most likely fails on a BGFS with the error "rename: resource busy
# (Device or resource busy)"
! git-annex get --fast -J8
# Remove the last byte from each files to prevent the "download failed:
# ResponseBodyTooShort" error
ls -l $(list) | grep -oE "\.git/[^']*" | \
	cut -d'/' -f7 | xargs -n1 -- find .git/annex/tmp/ -name | \
	while read f
	do
		newfsize=$(($(stat -c '%s' "${f}") - 1))
		chmod +w "${f}"
		truncate -s $newfsize "${f}"
	done
# Retry incomplete downloads
git-annex get --fast --incomplete
git-annex migrate --fast -c annex.largefiles=anything *
(cd bin/
 sha256sum -c sha256sums) || \
exit_on_error_code "Failed to download git-lfs"

# Install git-lfs
tar -C bin/git-lfs-linux-amd64-${_VERSION} -xf bin/git-lfs-linux-amd64-${_VERSION}.tar.gz || \
exit_on_error_code "Failed to extract git-lfs"

pushd bin/ >/dev/null
ln -sf git-lfs-linux-amd64-${_VERSION}/git-lfs .
popd >/dev/null