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| 1 | +#!/usr/bin/env sh |
| 2 | + |
| 3 | +# This is a wrapper script, that automatically download mill from GitHub release pages |
| 4 | +# You can give the required mill version with --mill-version parameter |
| 5 | +# If no version is given, it falls back to the value of DEFAULT_MILL_VERSION |
| 6 | +# |
| 7 | +# Project page: https://github.com/lefou/millw |
| 8 | +# Script Version: 0.4.2 |
| 9 | +# |
| 10 | +# If you want to improve this script, please also contribute your changes back! |
| 11 | +# |
| 12 | +# Licensed under the Apache License, Version 2.0 |
| 13 | + |
| 14 | + |
| 15 | +DEFAULT_MILL_VERSION=0.10.0 |
| 16 | + |
| 17 | +set -e |
| 18 | + |
| 19 | +MILL_REPO_URL="https://github.com/com-lihaoyi/mill" |
| 20 | + |
| 21 | +if [ -z "${CURL_CMD}" ] ; then |
| 22 | + CURL_CMD=curl |
| 23 | +fi |
| 24 | + |
| 25 | +# Explicit commandline argument takes precedence over all other methods |
| 26 | +if [ "$1" = "--mill-version" ] ; then |
| 27 | + shift |
| 28 | + if [ "x$1" != "x" ] ; then |
| 29 | + MILL_VERSION="$1" |
| 30 | + shift |
| 31 | + else |
| 32 | + echo "You specified --mill-version without a version." 1>&2 |
| 33 | + echo "Please provide a version that matches one provided on" 1>&2 |
| 34 | + echo "${MILL_REPO_URL}/releases" 1>&2 |
| 35 | + false |
| 36 | + fi |
| 37 | +fi |
| 38 | + |
| 39 | +# Please note, that if a MILL_VERSION is already set in the environment, |
| 40 | +# We reuse it's value and skip searching for a value. |
| 41 | + |
| 42 | +# If not already set, read .mill-version file |
| 43 | +if [ -z "${MILL_VERSION}" ] ; then |
| 44 | + if [ -f ".mill-version" ] ; then |
| 45 | + MILL_VERSION="$(head -n 1 .mill-version 2> /dev/null)" |
| 46 | + fi |
| 47 | +fi |
| 48 | + |
| 49 | +if [ -n "${XDG_CACHE_HOME}" ] ; then |
| 50 | + MILL_DOWNLOAD_PATH="${XDG_CACHE_HOME}/mill/download" |
| 51 | +else |
| 52 | + MILL_DOWNLOAD_PATH="${HOME}/.cache/mill/download" |
| 53 | +fi |
| 54 | + |
| 55 | +# If not already set, try to fetch newest from Github |
| 56 | +if [ -z "${MILL_VERSION}" ] ; then |
| 57 | + # TODO: try to load latest version from release page |
| 58 | + echo "No mill version specified." 1>&2 |
| 59 | + echo "You should provide a version via '.mill-version' file or --mill-version option." 1>&2 |
| 60 | + |
| 61 | + mkdir -p "${MILL_DOWNLOAD_PATH}" |
| 62 | + LANG=C touch -d '1 hour ago' "${MILL_DOWNLOAD_PATH}/.expire_latest" 2>/dev/null || ( |
| 63 | + # we might be on OSX or BSD which don't have -d option for touch |
| 64 | + # but probably a -A [-][[hh]mm]SS |
| 65 | + touch "${MILL_DOWNLOAD_PATH}/.expire_latest"; touch -A -010000 "${MILL_DOWNLOAD_PATH}/.expire_latest" |
| 66 | + ) || ( |
| 67 | + # in case we still failed, we retry the first touch command with the intention |
| 68 | + # to show the (previously suppressed) error message |
| 69 | + LANG=C touch -d '1 hour ago' "${MILL_DOWNLOAD_PATH}/.expire_latest" |
| 70 | + ) |
| 71 | + |
| 72 | + # POSIX shell variant of bash's -nt operator, see https://unix.stackexchange.com/a/449744/6993 |
| 73 | + # if [ "${MILL_DOWNLOAD_PATH}/.latest" -nt "${MILL_DOWNLOAD_PATH}/.expire_latest" ] ; then |
| 74 | + if [ -n "$(find -L "${MILL_DOWNLOAD_PATH}/.latest" -prune -newer "${MILL_DOWNLOAD_PATH}/.expire_latest")" ]; then |
| 75 | + # we know a current latest version |
| 76 | + MILL_VERSION=$(head -n 1 "${MILL_DOWNLOAD_PATH}"/.latest 2> /dev/null) |
| 77 | + fi |
| 78 | + |
| 79 | + if [ -z "${MILL_VERSION}" ] ; then |
| 80 | + # we don't know a current latest version |
| 81 | + echo "Retrieving latest mill version ..." 1>&2 |
| 82 | + LANG=C ${CURL_CMD} -s -i -f -I ${MILL_REPO_URL}/releases/latest 2> /dev/null | grep --ignore-case Location: | sed s'/^.*tag\///' | tr -d '\r\n' > "${MILL_DOWNLOAD_PATH}/.latest" |
| 83 | + MILL_VERSION=$(head -n 1 "${MILL_DOWNLOAD_PATH}"/.latest 2> /dev/null) |
| 84 | + fi |
| 85 | + |
| 86 | + if [ -z "${MILL_VERSION}" ] ; then |
| 87 | + # Last resort |
| 88 | + MILL_VERSION="${DEFAULT_MILL_VERSION}" |
| 89 | + echo "Falling back to hardcoded mill version ${MILL_VERSION}" 1>&2 |
| 90 | + else |
| 91 | + echo "Using mill version ${MILL_VERSION}" 1>&2 |
| 92 | + fi |
| 93 | +fi |
| 94 | + |
| 95 | +MILL="${MILL_DOWNLOAD_PATH}/${MILL_VERSION}" |
| 96 | + |
| 97 | +try_to_use_system_mill() { |
| 98 | + MILL_IN_PATH="$(command -v mill || true)" |
| 99 | + |
| 100 | + if [ -z "${MILL_IN_PATH}" ]; then |
| 101 | + return |
| 102 | + fi |
| 103 | + |
| 104 | + UNIVERSAL_SCRIPT_MAGIC="@ 2>/dev/null # 2>nul & echo off & goto BOF" |
| 105 | + |
| 106 | + if ! head -c 128 "${MILL_IN_PATH}" | grep -qF "${UNIVERSAL_SCRIPT_MAGIC}"; then |
| 107 | + if [ -n "${MILLW_VERBOSE}" ]; then |
| 108 | + echo "Could not determine mill version of ${MILL_IN_PATH}, as it does not start with the universal script magic2" 1>&2 |
| 109 | + fi |
| 110 | + return |
| 111 | + fi |
| 112 | + |
| 113 | + # Roughly the size of the universal script. |
| 114 | + MILL_VERSION_SEARCH_RANGE="2403" |
| 115 | + MILL_IN_PATH_VERSION=$(head -c "${MILL_VERSION_SEARCH_RANGE}" "${MILL_IN_PATH}" |\ |
| 116 | + sed -n 's/^.*-DMILL_VERSION=\([^\s]*\) .*$/\1/p' |\ |
| 117 | + head -n 1) |
| 118 | + |
| 119 | + if [ -z "${MILL_IN_PATH_VERSION}" ]; then |
| 120 | + echo "Could not determine mill version, even though ${MILL_IN_PATH} has the universal script magic" 1>&2 |
| 121 | + return |
| 122 | + fi |
| 123 | + |
| 124 | + if [ "${MILL_IN_PATH_VERSION}" = "${MILL_VERSION}" ]; then |
| 125 | + MILL="${MILL_IN_PATH}" |
| 126 | + fi |
| 127 | +} |
| 128 | +try_to_use_system_mill |
| 129 | + |
| 130 | +# If not already downloaded, download it |
| 131 | +if [ ! -s "${MILL}" ] ; then |
| 132 | + |
| 133 | + # support old non-XDG download dir |
| 134 | + MILL_OLD_DOWNLOAD_PATH="${HOME}/.mill/download" |
| 135 | + OLD_MILL="${MILL_OLD_DOWNLOAD_PATH}/${MILL_VERSION}" |
| 136 | + if [ -x "${OLD_MILL}" ] ; then |
| 137 | + MILL="${OLD_MILL}" |
| 138 | + else |
| 139 | + VERSION_PREFIX="$(echo $MILL_VERSION | cut -b -4)" |
| 140 | + case $VERSION_PREFIX in |
| 141 | + 0.0. | 0.1. | 0.2. | 0.3. | 0.4. ) |
| 142 | + DOWNLOAD_SUFFIX="" |
| 143 | + ;; |
| 144 | + *) |
| 145 | + DOWNLOAD_SUFFIX="-assembly" |
| 146 | + ;; |
| 147 | + esac |
| 148 | + unset VERSION_PREFIX |
| 149 | + |
| 150 | + DOWNLOAD_FILE=$(mktemp mill.XXXXXX) |
| 151 | + # TODO: handle command not found |
| 152 | + echo "Downloading mill ${MILL_VERSION} from ${MILL_REPO_URL}/releases ..." 1>&2 |
| 153 | + MILL_VERSION_TAG=$(echo $MILL_VERSION | sed -E 's/([^-]+)(-M[0-9]+)?(-.*)?/\1\2/') |
| 154 | + ${CURL_CMD} -f -L -o "${DOWNLOAD_FILE}" "${MILL_REPO_URL}/releases/download/${MILL_VERSION_TAG}/${MILL_VERSION}${DOWNLOAD_SUFFIX}" |
| 155 | + chmod +x "${DOWNLOAD_FILE}" |
| 156 | + mkdir -p "${MILL_DOWNLOAD_PATH}" |
| 157 | + mv "${DOWNLOAD_FILE}" "${MILL}" |
| 158 | + |
| 159 | + unset DOWNLOAD_FILE |
| 160 | + unset DOWNLOAD_SUFFIX |
| 161 | + fi |
| 162 | +fi |
| 163 | + |
| 164 | +unset MILL_DOWNLOAD_PATH |
| 165 | +unset MILL_OLD_DOWNLOAD_PATH |
| 166 | +unset OLD_MILL |
| 167 | +unset MILL_VERSION |
| 168 | +unset MILL_VERSION_TAG |
| 169 | +unset MILL_REPO_URL |
| 170 | + |
| 171 | +exec "${MILL}" "$@" |
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