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103 lines
2.4 KiB
Bash
103 lines
2.4 KiB
Bash
4 years ago
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#ft=sh
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bail () {
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>&2 echo "ERROR: $1"
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exit 1
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}
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must_be_root () {
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if [ "$(id --user)" != 0 ]; then
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bail "must run as root"
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fi
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}
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get_os () {
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case $(uname -s) in
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Linux*) echo linux;;
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Darwin*) echo darwin;;
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*) bail "unsupported os: $(uname -s)" ;;
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esac
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}
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get_arch () {
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case $(uname -m) in
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x86_64*) echo amd64;;
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amd64*) echo amd64;;
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*) bail "unsupported architecture: $(uname -m)" ;;
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esac
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}
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set_current_link () {
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prefix="${1}"
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version="${2}"
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sudo="${3}"
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current="${prefix}/current"
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if [ -s "${current}" ] ; then
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$sudo unlink "${current}"
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fi
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$sudo ln --symbolic --relative "${prefix}/${version}" "${current}"
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}
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extract_tarball () {
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url="${1}"
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dest="${2}"
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args="${3}"
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sudo="${4}"
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if [ -d "${dest}" ]; then
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return
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fi
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$sudo mkdir -p "${dest}"
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tmp_dir="$(mktemp --directory)"
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tarball=${tmp_dir}/release.tar.gz
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curl --silent --location --output "${tarball}" "${url}"
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# shellcheck disable=SC2086
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$sudo tar xf "${tarball}" --directory "${dest}" ${args}
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rm -rf "${tmp_dir}"
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}
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relative_path() {
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# both $1 and $2 are absolute paths beginning with /
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# $1 must be a canonical path; that is none of its directory
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# components may be ".", ".." or a symbolic link
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#
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# returns relative path to $2/$target from $1/$src
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src=$1
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target=$2
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common_part=$src
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result=
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while [ "${target#"$common_part"}" = "$target" ]; do
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# no match, means that candidate common part is not correct
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# go up one level (reduce common part)
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common_part=$(dirname "$common_part")
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# and record that we went back, with correct / handling
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if [ -z "$result" ]; then
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result=..
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else
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result=../$result
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fi
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done
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if [ "$common_part" = / ]; then
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# special case for root (no common path)
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result=$result/
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fi
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# since we now have identified the common part,
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# compute the non-common part
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forward_part=${target#"$common_part"}
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# and now stick all parts together
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if [ -n "$result" ] && [ -n "$forward_part" ]; then
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result=$result$forward_part
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elif [ -n "$forward_part" ]; then
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# extra slash removal
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result=${forward_part#?}
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fi
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printf '%s' "$result"
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}
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