1#!/bin/sh 2# 3# Written by Rich Felker, originally as part of musl libc. 4# Multi-licensed under MIT, 0BSD, and CC0. 5# 6# This is an actually-safe install command which installs the new 7# file atomically in the new location, rather than overwriting 8# existing files. 9# 10 11usage() { 12printf "usage: %s [-D] [-l] [-m mode] src dest\n" "$0" 1>&2 13exit 1 14} 15 16mkdirp= 17symlink= 18mode=755 19 20while getopts Dlm: name ; do 21case "$name" in 22D) mkdirp=yes ;; 23l) symlink=yes ;; 24m) mode=$OPTARG ;; 25?) usage ;; 26esac 27done 28shift $(($OPTIND - 1)) 29 30test "$#" -eq 2 || usage 31src=$1 32dst=$2 33tmp="$dst.tmp.$$" 34 35case "$dst" in 36*/) printf "%s: %s ends in /\n", "$0" "$dst" 1>&2 ; exit 1 ;; 37esac 38 39set -C 40set -e 41 42if test "$mkdirp" ; then 43umask 022 44case "$dst" in 45*/*) mkdir -p "${dst%/*}" ;; 46esac 47fi 48 49trap 'rm -f "$tmp"' EXIT INT QUIT TERM HUP 50 51umask 077 52 53if test "$symlink" ; then 54ln -s "$src" "$tmp" 55else 56cat < "$src" > "$tmp" 57chmod "$mode" "$tmp" 58fi 59 60mv -f "$tmp" "$dst" 61test -d "$dst" && { 62rm -f "$dst/$tmp" 63printf "%s: %s is a directory\n" "$0" "$dst" 1>&2 64exit 1 65} 66 67exit 0 68