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Compare strings in ksh, without spawning grep

It's way faster to do it this way.

Faster requested by deraadt@

#!/bin/ksh
#	$OpenBSD$
#
# Copyright (c) 2021 Andrew Hewus Fresh <afresh1@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

set -o errexit -o pipefail -o nounset
export PATH=/usr/bin:/bin:/usr/sbin:/sbin

CFILE=SHA256.sig
DESTDIR=${DESTDIR:-}
FWPATTERNS="${DESTDIR}/usr/share/misc/firmware_patterns"

VNAME=${VNAME:-$(sysctl -n kern.osrelease)}
VERSION=${VERSION:-"${VNAME%.*}${VNAME#*.}"}

HTTP_FWDIR="$VNAME"
VTYPE=$( sed -n "/^OpenBSD $VNAME\([^ ]*\).*$/s//\1/p" \
    /var/run/dmesg.boot | sed '$!d' )
[[ $VTYPE == -!(stable) ]] && HTTP_FWDIR=snapshots

FWURL=http://firmware.openbsd.org/firmware/${HTTP_FWDIR}
FWPUB_KEY=${DESTDIR}/etc/signify/openbsd-${VERSION}-fw.pub

LOCALSRC=

tmpdir() {
	local _i=1 _dir

	# If we're not in the installer,
	# we have mktemp and a more hostile environment.
	if [ -x /usr/bin/mktemp ]; then
		_dir=$( mktemp -d "${1}-XXXXXXXXX" )
	else
		until _dir="${1}.$_i.$RANDOM" && mkdir -- "$_dir" 2>/dev/null; do
		    ((++_i < 10000)) || return 1
		done
	fi

	echo "$_dir"
}

fetch() {
	local _src="${FWURL}/${1##*/}" _dst=$1 _user=_file _exit

	# If we're not in the installer,
	# we have su(1) and doas(1) is unlikely to be configured.
	if [ -x /usr/bin/su ]; then
		/usr/bin/su -s /bin/ksh "$_user" -c \
		    "/usr/bin/ftp -D 'Get/Verify' -Vm -o- '$_src'" > "$_dst"
		_exit="$?"
	else
		/usr/bin/doas -u "$_user" \
		    /usr/bin/ftp -D 'Get/Verify' -Vm -o- "$_src" > "$_dst"
		_exit="$?"
	fi

	if [ "$_exit" -ne 0 ]; then
		rm -f "$_dst"
		echo "Cannot fetch $_src" >&2
		return 1
	fi
}

verify() {
	# On the installer we don't get sha256 -C, so fake it.
	if ! fgrep -qx "SHA256 (${1##*/}) = $( /bin/sha256 -qb "$1" )" "$CFILE"; then
		echo "Checksum test for ${1##*/} failed." >&2
		return 1
	fi
}

devices_needing_firmware() {
	local _d _m _line _dmesgtail _last=''

	# When we're not in the installer, the dmesg.boot can
	# contain multiple boots, so only look in the last one
	sed -n 'H;/^OpenBSD/h;${g;p;}' /var/run/dmesg.boot | { \
		_m=0
		set -A _dmesgtail
		while read -r _line; do
			_dmesgtail[$_m]="$_line"
			let _m=$_m+1
		done

		grep -v '^[[:space:]]*#' "$FWPATTERNS" |
		    while read -r _d _m; do
			[ "$_d" = "$_last" ] && continue
			[ "$_m" ] || _m="^${_d}[0-9] at "

			if [ "$_m" = "${_m#^}" ]; then
				_m="*$_m"
			else
				_m="${_m#^}"
			fi

			for _line in "${_dmesgtail[@]}"; do
				if [[ $_line = ${_m}* ]]; then
					echo "$_d"
					_last="$_d"
				fi
			done
		    done
	}
}

firmware_filename() {
	local _f
	_f="$( sed -n "s/.*(\($1-firmware-.*\.tgz\)).*/\1/p" "$CFILE" | sed '$!d' )"
	! [ "$_f" ] && echo "Unable to find firmware for $1" >&2 && return 1
	echo "$_f"
}

firmware_devicename() {
	local _d="${1##*/}"
	_d="${_d%-firmware-*}"
	echo "$_d"
}

installed_firmware() {
	for fw in "${DESTDIR}/var/db/pkg/$1-firmware"*; do
		[ -e "$fw" ] || continue
		echo "${fw##*/}"
	done
}

add_firmware () {
	local _f="${1##*/}"
	local _pkgdir="${DESTDIR}/var/db/pkg/${_f%.tgz}"
	ftp -D "Install" -Vmo- "file:${1}" |
		tar -s ",^\+,${_pkgdir}/+," \
		    -s ",^firmware,${DESTDIR}/etc/firmware," \
		    -C / -zxphf - "+*" "firmware/*"

	# TODO: Should we mark these so real fw_update can -Drepair?
	ed -s "${_pkgdir}/+CONTENTS" <<EOL
/^@comment pkgpath/ -1a
@option manual-installation
@option firmware
@comment install-script
.
w
EOL
}

delete_firmware() {
	local _cwd _pkg="$1" _pkgdir="${DESTDIR}/var/db/pkg"

	# TODO: Check hash for files before deleting
	echo "Uninstalling $_pkg"
	_cwd="${_pkgdir}/$_pkg"

	set -A _remove -- "${_cwd}/+CONTENTS" "${_cwd}"

	while read -r c g; do
		case $c in
		@cwd) _cwd="${DESTDIR}$g"
		  ;;
		@*) continue
		  ;;
		*) set -A _remove -- "$_cwd/$c" "${_remove[@]}"
		  ;;
		esac
	done < "${_pkgdir}/${_pkg}/+CONTENTS"

	# We specifically rm -f here because not removing files/dirs
	# is probably not worth failing over.
	for _r in "${_remove[@]}" ; do
		if [ -d "$_r" ]; then
			# Try hard not to actually remove recursively
			# without rmdir on the install media.
			[ "$_r/*" = "$( echo "$_r"/* )" ] && rm -rf "$_r"
		else
			rm -f "$_r"
		fi
	done
}

usage() {
	echo "usage: fw_install [-DL] [driver | file [...]]"
	exit 2
}

INSTALL=true
DOWNLOAD=true

while getopts DL name
do
       case "$name" in
       # "download only" means local dir and don't install
       D) LOCALSRC=. INSTALL=false ;;
       L) LOCALSRC=. ;;
       ?) usage 2 ;;
       esac
done
shift $((OPTIND - 1))

# If we're installing from a local dir
# we don't want to download anything
[ "$LOCALSRC" ] && "$INSTALL" && DOWNLOAD=false
[ "$LOCALSRC" ] || LOCALSRC="$( tmpdir "${DESTDIR}/tmp/fw_install" )"

CFILE="$LOCALSRC/$CFILE"

set -A devices -- "$@"

[ "${devices[*]:-}" ] ||
    set -A devices -- $( devices_needing_firmware )

if [ ! "${devices[*]:-}" ]; then
	echo "No devices found which need firmware files to be downloaded."
	exit
fi

if "$DOWNLOAD"; then
	fetch "$CFILE"
	! signify -qVep "$FWPUB_KEY" -x "$CFILE" -m "$CFILE" &&
	    echo "Signature check of SHA256.sig failed" >&2 && exit 1
fi

for f in "${devices[@]}"; do
	d="$( firmware_devicename "$f" )"

	if [ "$f" = "$d" ]; then
		f=$( firmware_filename "$d" || true )
		[ "$f" ] || continue
		f="$LOCALSRC/$f"
	elif ! "$INSTALL" && ! grep -Fq "($f)" "$CFILE" ; then
		echo "Cannot download local file $f" >&2
		exit 2
	fi

	set -A installed -- $( installed_firmware "$d" )

	if "$INSTALL" && [ "${installed[*]:-}" ]; then
		for i in "${installed[@]}"; do
			if [ "${f##*/}" = "$i.tgz" ]; then
				echo "$i already installed"
				continue 2
			fi
		done
	fi

	if [ -e "$f" ]; then
		if "$DOWNLOAD"; then
			echo "Verify existing ${f##*/}"
			verify "$f" || continue
		# else assume it was verified when downloaded
		fi
	elif "$DOWNLOAD"; then
		fetch  "$f" || continue
		verify "$f" || continue
	elif "$INSTALL"; then
		echo "Cannot install ${f##*/}, not found" >&2
		continue
	fi

	"$INSTALL" || continue

	if [ "${installed[*]:-}" ]; then
		for i in "${installed[@]}"; do
			delete_firmware "$i"
		done
	fi

	add_firmware "$f"
done