1#!/bin/sh 2# 3# This is an actually-safe install command which installs the new 4# file atomically in the new location, rather than overwriting 5# existing files. 6# 7 8usage() { 9printf "usage: %s [-D] [-l] [-r] [-m mode] src dest\n" "$0" 1>&2 10exit 1 11} 12 13mkdirp= 14symlink= 15symlinkflags="-s" 16mode=755 17 18while getopts Dlrm: name ; do 19case "$name" in 20D) mkdirp=yes ;; 21l) symlink=yes ;; 22r) symlink=yes; symlinkflags="$symlinkflags -r" ;; 23m) mode=$OPTARG ;; 24?) usage ;; 25esac 26done 27shift $(($OPTIND - 1)) 28 29test "$#" -eq 2 || usage 30src=$1 31dst=$2 32tmp="$dst.tmp.$$" 33 34case "$dst" in 35*/) printf "%s: %s ends in /\n", "$0" "$dst" 1>&2 ; exit 1 ;; 36esac 37 38set -C 39set -e 40 41if test "$mkdirp" ; then 42umask 022 43case "$2" in 44*/*) mkdir -p "${dst%/*}" ;; 45esac 46fi 47 48trap 'rm -f "$tmp"' EXIT INT QUIT TERM HUP 49 50umask 077 51 52if test "$symlink" ; then 53umask 000 54ln $symlinkflags "$1" "$tmp" 55umask 077 56else 57cat < "$1" > "$tmp" 58chmod "$mode" "$tmp" 59fi 60 61mv -f "$tmp" "$2" 62test -d "$2" && { 63rm -f "$2/$tmp" 64printf "%s: %s is a directory\n" "$0" "$dst" 1>&2 65exit 1 66} 67 68exit 0 69