remove download scripts, consolidate into script

most of them were just calling the gitclone script,
so remove them.

the grub script was treating gnulib as a dependency.
i've now added the ability to grab 1 dependency, in
the gitclone script (it should be expanded later to
support multiple dependencies)

the gitclone script has been renamed to "fetch".
the "fetch_trees" script does more or less the same
thing, but calls "fetch" and handles multiple revisions
if a project needs that

this is more efficient, and slightly reduces the code
size of lbmk!

Signed-off-by: Leah Rowe <leah@libreboot.org>

fetch

@@ -0,0 +1,134 @@
+#!/usr/bin/env sh
+
+# SPDX-FileCopyrightText: 2022 Caleb La Grange <thonkpeasant@protonmail.com>
+# SPDX-FileCopyrightText: 2022 Ferass El Hafidi <vitali64pmemail@protonmail.com>
+# SPDX-FileCopyrightText: 2023 Leah Rowe <leah@libreboot.org>
+# SPDX-License-Identifier: GPL-3.0-only
+
+name=""
+revision=""
+location=""
+url=""
+bkup_url=""
+tmp_dir=""
+depend=""
+
+main()
+{
+	if [ -z "${1+x}" ]; then
+		err 'Error: name not set'
+	fi
+
+	name=${1}
+
+	read_config
+	verify_config
+
+	clone_project
+
+	# dependencies are downloaded *after*
+	# to account for cases like gnulib in grub where
+	# the dependency (gnulib) goes inside the main repo (grub)
+	if [ "${depend}" != "" ]; then
+		./fetch ${depend} || exit 1
+	fi
+
+	# clean in case of failure
+	rm -Rf ${tmp_dir} >/dev/null 2>&1 || exit 1
+}
+
+read_config()
+{
+	awkstr=" /\{.*${name}.*}{/ {flag=1;next} /\}/{flag=0} flag { print }"
+	while read -r line ; do
+		set ${line} >/dev/null 2>&1
+		case ${line} in
+		rev:*)
+			revision=${2}
+			;;
+		loc:*)
+			location=${2}
+			;;
+		url:*)
+			url=${2}
+			;;
+		bkup_url:*)
+			bkup_url=${2}
+			;;
+		depend:*)
+			depend=${2}
+			;;
+		esac
+	done << EOF
+	$(eval "awk '${awkstr}' resources/git/revisions")
+EOF
+}
+
+verify_config()
+{
+	if [ -z "${revision+x}" ]; then
+		err 'Error: revision not set'
+	elif [ -z "${location+x}" ]; then
+		err 'Error: location not set'
+	elif [ -z "${url+x}" ]; then
+		err 'Error: url not set'
+	fi
+}
+
+clone_project()
+{
+	tmp_dir=$(mktemp -dt "${name}_XXXXX")
+
+	git clone ${url} ${tmp_dir} || git clone ${bkup_url} ${tmp_dir} \
+			|| err "ERROR: could not download ${name}"
+
+	(
+	cd ${tmp_dir} || err "tmpdir not created"
+	git reset --hard ${revision} || err "Cannot reset revision"
+	)
+
+	patch_project
+
+	if [ -d "${location}" ]; then
+		rm -Rf ${location} || err "Cannot remove directory '${location}'"
+	fi
+	mv ${tmp_dir} ${location} && return 0
+
+	printf "ERROR: Could not copy temp file to destination.\n"
+	err " ${tmp_dir} > ${location} check permissions"
+}
+
+patch_project()
+{
+	patchdir="resources/${name}/patches"
+
+	for patchfile in ${PWD}/${patchdir}/*.patch ; do
+		if [ ! -f "${patchfile}" ]; then
+			continue
+		fi
+		(
+		cd ${tmp_dir} || err "tmpdir not created"
+		git am ${patchfile} || err "Cannot patch project: $name"
+		)
+	done
+}
+
+usage()
+{
+	cat <<- EOF
+	Usage: ./fetch [name]
+
+	Options:
+	name: Module name as specified in resources/git/revisions
+	EOF
+}
+
+err()
+{
+	printf "${@}\n"
+	usage
+	rm -Rf ${tmp_dir} >/dev/null 2>&1
+	exit 1
+}
+
+main $@