#!/bin/sh

# NAME:
#	install.sh - portable version of install(1)
#
# SYNOPSIS:
#	install [-CNcs] [-f flags] [-i errs] [-o owner] [-g group] [-m mode] file1 file2 ...
#	install -d  [-i errs] [-o owner] [-g group] [-m mode] directory ...
#
# DESCRIPTION:
#	Compatible with BSD install(1).  Except that '-c' is always
#	true and we always move an already installed target aside as
#	this is important on many systems.  Recent BSD install(1)
#	versions have a '-b' option for this.
#	
#
# OPTIONS:
#	-b	move previous target file aside (always true).
#
#	-B "suffix"
#		use "suffix" instead of .old for saving existing target.
#	
#	-c	copy rather than move the file into place (always true).
#
#	-C	compare.  Only install if target is missing or
#		different.
#
#	-N	newer. Only install if target is missing or older.
#	
#	-s	strip target
#
#	-o "owner"
#		make target owned by "owner"
#
#	-g "group"
#		make target group owned by "group"
#
#	-m "mode"
#		set permissions to "mode"
#
#	-f "flags"
#		Pass "flags" onto chflags(1)
#		
#	-i "errs"
#		Ignore errors from steps indicated by "errs" (``s,o,g,m'').
#
# BUGS:
#	The '-i' option is to save your sanity when 'bsd.prog.mk'
#	insists on haveing a '-o' "owner" option which is doomed to
#	fail on many systems.  We ignore '-b' and '-c' options.
#	
# AUTHOR:
#	Simon J. Gerraty <sjg@crufty.net>
#

# RCSid:
#	$Id: install-sh,v 1.25 2023/07/15 05:33:38 sjg Exp $
#
#	@(#) Copyright (c) 1993-2023 Simon J. Gerraty
#
#	This file is provided in the hope that it will
#	be of use.  There is absolutely NO WARRANTY.
#	Permission to copy, redistribute or otherwise
#	use this file is hereby granted provided that 
#	the above copyright notice and this notice are
#	left intact. 
#      
#	Please send copies of changes and bug-fixes to:
#	sjg@crufty.net
#

set -- `getopt B:bpxCNcsdo:g:m:i:f: $*`

Mydir=`dirname $0`
[ -s $Mydir/.installrc ] && . $Mydir/.installrc

OLD_EXT=.old
owner=:
group=:
mode=:
MODE=0
strip=:
mkdirs=
compare=:
newer=:
chflags=:
LS_1=
CP_p=

while :
do
	case "$1" in
	--)	shift; break;;
	-[bc])	;; # ignore
	-p)	CP_p=-p;;
	-x)	set -x;;
	-B)	OLD_EXT=$2; shift;;
	-C)	compare=Different;;
	-N)	newer=Newer;
		# check if /bin/ls supports -1
		'ls' -1 $0 > /dev/null 2>&1 && LS_1=1
		;;
	-o)	owner="${CHOWN:-chown} $2 "; shift;;
	-g)	group="${CHGRP:-chgrp} $2 "; shift;;
	-m)	MODE=$2 mode="${CHMOD:-chmod} $2 "; shift;;
	-s)	strip=${STRIP:-strip};;
	-d)	mkdirs="mkdir -p";;
	-i)	ignore_err="$ignore_err$2"; shift;;
	-f)	chflags="${CHFLAGS:-chflags} $2 "; shift;;
	*)	break;;
	esac
	shift
done

Newer() {
	n=`'ls' -t$LS_1 $* 2> /dev/null | head -1`
	[ $1 = $n ]
}

Different() {
	cmp -s $*
	[ $? != 0 ]
}

Err() {
	case "$ignore_err" in
	*$1*)	;;
	*)	exit 1;;
	esac
}

Setem() {
	# the order is important
	if [ ! -d $1 ]; then
		$strip $1 || Err s
	fi
	$group $1 || Err g
	$owner $1 || Err o
	$mode  $1 || Err m
	$chflags $1 || Err f
	return 0
}

# a bug in HP-UX's /bin/sh, means we need to re-set $*
# after any calls to add_path()
args="$*"

add_path () {
	test -d $1 || return
	case ":$PATH:" in
	*:$1:*) return;;
	esac
	PATH=$PATH:$1
}

add_path /sbin
add_path /usr/sbin

case "$owner" in
:)	;;
*)	# some systems put chown in odd places
	add_path /etc
	add_path /usr/etc
	;;
esac

# restore saved $*
set -- $args

# make directories if needed
# and ensure mode etc are as desired
if [ "$mkdirs" ]; then
	case "$MODE" in
	[1-7]*)
		# make sure umask is compatible
		case "$MODE" in
		????*) MODE=`echo $MODE | sed 's,.*\(...\)$,\1,'`;;
		esac
		umask `expr 0777 - 0$MODE |
		sed 's,^,000,;s,^.*\(...\)$,\1,'`;;
	esac
	for d in $*
	do
		[ ! -d $d ] && $mkdirs $d
		Setem $d
	done
	exit 0			# that's all we do
fi

# install files
if [ $# -eq 1 ]; then
	echo "what should I do with $*?" >&2
	exit 1
fi

# get list of files
files=
while [ $# -gt 1 ]
do
	test "x$files" = x || dest_dir=yes
	files="$files $1"
	shift
done
# last one is dest
dest=$1
shift

if [ "$dest_dir" = yes -a  ! -d $dest ]; then
	echo "no directory $dest" >&2
	exit 1
fi

for f in $files
do
	b=`basename $f`
	if [ -d $dest ]; then
		t=$dest/$b
	else
		t=$dest
	fi
	$newer $f $t || continue
	$compare $f $t || continue
	[ -f $t ] && { mv -f $t $t$OLD_EXT || exit 1; }
	{ cp $CP_p $f $t && Setem $t; } || exit 1
done
exit 0