#!/bin/bash
#
# pkgmeek - a drop-in replacement for pkgmk
#     based on upkgmk (c) 2018 therealfun
#    and pkgmk (c) 2004--2022 Per Liden et al.
# Distributed under the same license, 
# https://crux.nu/gitweb/?p=tools/pkgutils.git;a=blob_plain;f=COPYING;hb=HEAD

main() {
######################## main routine ################################
local pkg_dir src_dir work _local_ here url u pkg_utd f DIR TARGET
local errDL=0; local errUZ=0; local BSDTAR="/usr/bin/bsdtar --format=gnutar"
parse_options "$@"

# Exit early if refreshing an existing sha256 manifest was requested
[ "$PKGMK_REFRESH_SIG" = "yes" ] && { make_signature refresh && info "signature refreshed."; exit $?; }
#
# Read the Pkgfile to determine what to do next. But first ensure that
# it came from a trusted source (FS#1851)
#
[ "$PKGMK_UPDATE_SIG" = "yes" ] && [ -e ./Pkgfile ] || validate_pkgfile || exit $E_PKGFILE
[ -f .32bit ] && PKGMK_ARCH=32 || PKGMK_ARCH=64
. "Pkgfile"; . "$PKGMK_CONF"

# respect the settings for centralized source and package directories ...
[ -v pkg_dir  ] || pkg_dir="$PKGMK_PACKAGE_DIR"/
[ -w "$pkg_dir" ] || pkg_dir="$(pwd)"/
[ -v src_dir  ] || src_dir="$PKGMK_SOURCE_DIR"
[ -w "$src_dir" ] || src_dir=

# ... and for WORK_DIR in case the user wants to build in RAM
[ -v PKGMK_WORK_DIR ] && work="$PKGMK_WORK_DIR"

# Let the main routine and subsequent subroutines know what filenames
# they should expect to see on disk.
package="${name}#${version}-${release}.pkg.tar.${PKGMK_COMPRESSION_MODE}"
declare -a _local_
for (( s=0; s<${#source[@]}; s++ )); do
	case "${source[s]}" in
	http://*|https://*|ftp://*|__git__*)
		_local_[s]="${source[s]##*/}"    # strip the leading path
		# and for git sources, extract the project name:
		[[ "${source[s]}" =~ ^__git__ ]] && { _local_[s]="${_local_[s]%%\#*}";
		_local_[s]="${_local_[s]%.git}"; } ;;
	*)
		_local_[s]="${source[s]}" ;;
	esac
	[ -z "${renames[s]}" ] || [ "${renames[s]}" = "SKIP" ] || \
		_local_[s]="${renames[s]}"
done
# Example: source = ( __git__https://gitlab.com/demo-user/cool-project.git#0.4.9
#                     https://dev.big-corp.com/src/needed-library.tgz
#                     random.patch )
#         _local_ = ( cool-project
#                     needed-library.zgt  <-- renamed to prevent automatic unpacking
#                     random.patch )

# The effective user should at least have write permissions on $PWD
[ -w "$(dirname "$work")" ] || work="$(pwd)"/work
rm -rf "$work"; mkdir -p "$work"/{src,pkg} && cd "$work"

# Skip the retrieval of sources if the user asked for '-utd' or '-uf'.
[[ "$PKGMK_MTIME_ONLY $PKGMK_UPDATE_FOOTPRINT" =~ yes ]] && [ -e "$PKGMK_PACKAGE_DIR/$package" ] \
    || { for (( u=0; u<${#_local_[@]}; u++ )); do
here="${_local_[u]}"; url="${source[u]}";
# at least one of the following commands should put a file of the
# appropriate name in the current directory
[ -e "$here" ] || [ "$src_dir" = "" ] || [ ! -e "$src_dir/$here" ] || ln -sf "$src_dir/$here" . ;
[ -e "$here" ] || [ ! -e "$PKGMK_ROOT/$here" ] || ln -sf "$PKGMK_ROOT/$here" . ;
[ -e "$here" ] || fetch_url "$url" "$here"; # <-- should also be able to resume partial downloads
[ -e "$here" ] || { error "failed to download $here. Check connection and try again."; errDL+=1; }
done ; }

[ $errDL = 0 ] && { [[ "$PKGMK_MTIME_ONLY $PKGMK_UPDATE_FOOTPRINT" =~ yes ]] || \
	info "Successfully obtained all needed source files."; } || exit $E_DOWNLOAD

# Can stop here if the user asked for '-do', but honor any requests for '-um', '-uf',
# '-us', '-eo', or '-utd' by proceeding to those steps
[ "$PKGMK_DOWNLOAD_ONLY" = "no" ] || [ "$PKGMK_UPDATE_FOOTPRINT" = "yes" ] \
	|| [ "$PKGMK_UPDATE_SIG" = "yes" ] || [ "$PKGMK_EXTRACT_ONLY" = "yes" ] \
	|| [ "$PKGMK_MTIME_ONLY" = "yes" ] || { cleanup_work; exit 0; }

# If '-utd' was requested, check the modification times and then exit.
check_pkg_mtime; pkg_utd=$?
[ "$PKGMK_MTIME_ONLY" = "no" ] || { cleanup_work; exit $pkg_utd; }

# Take into account all the actions that can be done without extracting
# the downloaded sources
[ "$pkg_utd" = 0 ] || [ "$PKGMK_FORCE" = "yes" ] || [ "$PKGMK_EXTRACT_ONLY" = "yes" ] \
	|| [[ "$PKGMK_UPDATE_FOOTPRINT $PKGMK_CHECK_SIG $PKGMK_UPDATE_SIG" =~ yes ]] \
	|| { info "$package is up to date, use '-f' to force a rebuild."; cleanup_work; exit 0; }

# Silence the progress report if the user never intended to proceed with unpacking
[ "$pkg_utd" = 1 ] || [[ "$PKGMK_CHECK_SIG $PKGMK_UPDATE_SIG" =~ yes ]] || \
	[[ "$PKGMK_IGNORE_SIG $PKGMK_UPDATE_FOOTPRINT" =~ yes ]] \
	|| echo "Checking signatures before unpacking..."

# The option -uf is meant to be used *after* a previous invocation of pkgmeek has
# alerted the user to a footprint mismatch.
if [ "$PKGMK_UPDATE_FOOTPRINT" = "yes" ]; then
	[ -f "$pkg_dir$package" ] || \
		{ error "unable to update footprint. File '$package' not found.";
		cleanup_work; exit "$E_FOOTPRINT"; }
	[ "$pkg_utd" = 1 ] || [ "$PKGMK_FORCE" = "yes" ] || \
		{ error "outdated package. Use '-f' to force the footprint update."; 
		cleanup_work; exit "$E_FOOTPRINT"; }
	cat_footprint > "$PKGMK_ROOT/.footprint" && { info "footprint created."; exit 0; } \
	|| { error "Failed to write the footprint."; cleanup_work; exit "$E_DIRPERM"; }
fi
# Updating signatures (option -us) requires only sources and footprint, not a built package.
# As with -uf, exit after fulfilling the explicit request for a manifest.
[ "$PKGMK_UPDATE_SIG" = "yes" ] && { make_signature new && info "signature created."; cleanup_work; exit $?; }

# All the sources should be here by now, let's verify that we can trust them.
readonly cs_fail_msg="Use '--ignore-signature' to override, if you have determined integrity by other means."
[ "$PKGMK_IGNORE_SIG" = "yes" ] || { check_signature "pre-build" | parse_signify_output;
case $? in
	0) info "Sources successfully authenticated." ;;
	1) error "Signature file missing or corrupted."
	    echo "$cs_fail_msg" ; cleanup_work; exit $E_SIGNATURE ;;
	2) error "Failed to authenticate remote sources using signify."
	    echo "$cs_fail_msg" ; cleanup_work; exit $E_SIGNATURE ;;
esac; }
[ "$PKGMK_CHECK_SIG" = "no" ] || { cleanup_work; exit 0; } # no need to continue if the user only requested -cs

if [ "$pkg_utd" = 0 ] || [[ "$PKGMK_FORCE $PKGMK_EXTRACT_ONLY" =~ yes ]]; then
	if [ "$(type -t unpack_source)" = "function" ]; then
		SRC=$PWD/src unpack_source || errUZ+=1
	else
		for (( u=0; u<${#_local_[@]}; u++ )) ; do
		here="${_local_[u]}"
		case "$here" in
		*.tar|*.tar.gz|*.tar.Z|*.tgz|*.tar.bz2|*.tbz2|*.tar.xz|*.txz|*.tar.lzma|*.tar.lz|*.7z|*.zip|*.rpm)
			bsdtar -p -o -C src -xf "$here" || errUZ+=1 ;;
		*)
			cp -r -L "$here" src/ ;;
		esac
		done
	fi
	[ $errUZ = 0 ] && info "Sources successfully unpacked." || \
		{ error "Failed to unpack all sources."; cleanup_work; exit "$E_UNPACK"; }
	[ "$PKGMK_EXTRACT_ONLY" = "no" ] || exit 0

# The actual build step! (use fakeroot when building daemon ports as an ordinary user,
#  otherwise the owner and group might not be correct)
	(SRC=$(pwd)/src; PKG=$(pwd)/pkg; cd src; set -e -x; build)
	[ $? = 0 ] && echo "Build successful. Moving on to compression." \
		|| { error "Unsuccessful build!"; cleanup_work; exit "$E_BUILD"; }

	# Strip binaries
	[ -n "$ns_filter" ] || [ ! -f "$PKGMK_ROOT/.nostrip" ] \
			|| ns_filter="| grep -v -f $PKGMK_ROOT/.nostrip"
	{ while read -r f; do
		case $(file -b "$f") in
		*ELF*executable*not\ stripped*)     strip --strip-all      "$f" ;;
		*ELF*shared\ object*not\ stripped*) strip --strip-unneeded "$f" ;;
		current\ ar\ archive)               strip --strip-debug    "$f" ;;
		esac
	done } < <(eval find pkg -type f $ns_filter)

	# Compress anything under /man that does not appear to be gzipped
	find pkg -type f -path "*/man/man*/*" \! -iname '*.gz' \
			-exec gzip -9 '{}' +

	# Ensure that symlinks point to the (now-compressed) manpages
	{ while IFS="!" read -r f DIR; do
		TARGET="$(readlink -n "$DIR/$f")"
		TARGET="${TARGET##*/}"; TARGET="${TARGET%.gz}.gz";
		rm -f "$DIR/$f"
		[ -e "$DIR/$TARGET" ] && ln -sf "$TARGET" "$DIR/${f%.gz}.gz"
	done } < <(find pkg -type l -path "*/man/man*/*" -printf '%f!%h\n')

	# Create the archive
	[ $UID = 0 ] || BSDTAR+=" --uid 0 --gid 0"
	if (cd pkg; $BSDTAR -cf "$pkg_dir$package" -- *); then
		info "Package creation successful."
	else
		error "Unable to create the compressed package $package."
		cleanup_work; exit "$E_BUILD"
	fi

	# Check the footprint of the built package, unless '-if' was given
	[ "$PKGMK_IGNORE_FOOTPRINT" = "yes" ] || check_footprint

fi  # Continue from here if extract and build were skipped

# Clean up the work directory.
find . -maxdepth 1 -mindepth 1 -type l -delete; cleanup_work

# Proceed to install/upgrade if requested.
if [ -n "$PKGMK_INSTALL_COMMAND" ]; then
	[ $UID = 0 ] && PKGMK_SU=""
	[ -z "$PKGMK_SU" ] || [ -x "$PKGMK_SU" ] || PKGMK_SU="/usr/bin/doas"
	[ -z "$PKGMK_SU" ] || [ -x "$PKGMK_SU" ] || 
		{ error "Cannot run pkgadd as a non-root user."; exit "$E_INSTALL"; }
	$PKGMK_SU $PKGMK_INSTALL_COMMAND "$pkg_dir$package" \
		&& info "pkgadd $package succeeded." || \
		{ error "pkgadd $package failed."; exit "$E_INSTALL"; }
fi

# Done!
}

#######################  error codes  ##############################
E_PKGFILE=2    # invalid Pkgfile
E_DIRPERM=3    # (source/build) directory missing or missing read/write permission
E_DOWNLOAD=4   # error during download
E_UNPACK=5     # error during unpacking of source file(s)
E_FOOTPRINT=6  # footprint mismatch
E_BUILD=7      # error while running 'build()'
E_INSTALL=8    # error while installing the package via 'pkgadd'
E_SIGNATURE=9  # error verifying the signature

########################  settings  ################################
readonly PKGMK_VERSION="#VERSION#"
readonly PKGMK_COMMAND="$0"
readonly PKGMK_ROOT="$PWD"
PKGMK_DOWNLOAD_PROG="/usr/bin/curl"
PKGMK_GIT_COMMAND="/usr/bin/git"
PKGMK_CONF="/etc/pkgmk.conf";     PKGMK_SU="/usr/bin/sudo"
PKGMK_SOURCE_DIR="$PWD";          PKGMK_WORK_DIR="$PWD/work"
PKGMK_PACKAGE_DIR="$PWD";         PKGMK_COMPRESSION_MODE="gz"
PKGMK_INSTALL_COMMAND="";         PKGMK_FORCE="no"
PKGMK_DOWNLOAD_ONLY="no";         PKGMK_KEEP_WORK="no"
PKGMK_EXTRACT_ONLY="no";          PKGMK_UPDATE_SIG="no"
PKGMK_MTIME_ONLY="no";            PKGMK_IGNORE_SIG="no"
PKGMK_UPDATE_FOOTPRINT="no";      PKGMK_REFRESH_SIG="no"
PKGMK_IGNORE_FOOTPRINT="no";      PKGMK_CHECK_SIG="no"
PKGMK_IGNORE_NEW="no";            PKGMK_PRIVATEKEY=""

######################## subroutines ################################
parse_options() {
	while [ "$1" ]; do
		case "$1" in
			-h|--help) print_help; exit 0 ;;
			-v|--version)
				echo "$(basename "$PKGMK_COMMAND") (pkgutils) $PKGMK_VERSION"; exit 0 ;;
			-uf|--update-footprint) PKGMK_UPDATE_FOOTPRINT="yes" ;;
			-us|--update-signature) PKGMK_UPDATE_SIG="yes" ;;
			-rs|--refresh-signature) PKGMK_REFRESH_SIG="yes" ;;
			-cs|--check-signature) PKGMK_CHECK_SIG="yes" ;;
			-d|--download) ;; # deprecated flags but don't throw an error for them
			-um|--update-md5sum) warn "updating md5sums is obsolete, ignoring option '$1'." ;;
			-r|--recursive) { warn "option '$1' no longer supported. Use a wrapper script for recursive operation."; exit 1; } ;;
			-c|--clean) { error "option '$1' no longer implemented in $(basename "$PKGMK_COMMAND"). Use prtwash instead."; exit 1; } ;;
			-do|--download-only) PKGMK_DOWNLOAD_ONLY="yes" ;;
			-eo|--extract-only) PKGMK_EXTRACT_ONLY="yes" ;;
			-utd|--up-to-date) PKGMK_MTIME_ONLY="yes" ;;
			-if|--ignore-footprint) PKGMK_IGNORE_FOOTPRINT="yes" ;;
			-in|--ignore-new) PKGMK_IGNORE_NEW="yes" ;;
			-is|--ignore-signature) PKGMK_IGNORE_SIG="yes" ;;
			-ns|--no-strip) ns_filter="-false" ;;
			-f|--force) PKGMK_FORCE="yes" ;;
			-kw|--keep-work) PKGMK_KEEP_WORK="yes" ;;
			-i|--install) PKGMK_INSTALL_COMMAND="/usr/bin/pkgadd" ;;
			-u|--upgrade) PKGMK_INSTALL_COMMAND="/usr/bin/pkgadd -u" ;;
			-pk|--public-key)
				[ "$2" ] && PKGMK_PUBLICKEY="$2" || { echo "$(basename "$PKGMK_COMMAND"): option $1 requires an argument";
					exit 1; }
				shift ;;
			-sk|--secret-key)
				[ "$2" ] && PKGMK_PRIVATEKEY="$2" || { echo "$(basename "$PKGMK_COMMAND"): option $1 requires an argument";
					exit 1; }
				shift ;;
			-cf|--config-file)
				[ "$2" ] && PKGMK_CONF="$2" || { echo "$(basename "$PKGMK_COMMAND"): option $1 requires an argument";
					exit 1; }
				shift ;;
			*)
				echo "$(basename "$PKGMK_COMMAND"): invalid option $1"; exit 1 ;;
		esac
		shift
	done
}

print_help() {
	echo "usage: $(basename "$PKGMK_COMMAND") [options]"
	echo "options: (highest to lowest precedence)"
	echo "  -h,   --help                print help and exit"
	echo "  -v,   --version             print version and exit"
	echo "  -cf,  --config-file <file>  use alternative configuration file"
	echo "  -sk,  --secret-key <file>   use <file> to sign the port"
	echo "  -pk,  --public-key <file>   check the port signature using public-key <file>"
	echo "  -rs,  --refresh-signature   create new signature based on existing sha256 checksums"
	echo "  -utd, --up-to-date          report whether the built package is up to date, then exit"
	echo "  -f,   --force               override timestamp check, build package or update footprint anyway"
	echo "  -uf,  --update-footprint    update footprint using result from last build"
	echo "  -do,  --download-only       stop after downloading all the necessary source file(s)"
	echo "  -cs,  --check-signature     stop after verifying the signatures of all downloaded sources"
	echo "  -us,  --update-signature    update signature of Pkgfile and sources, do not build"
	echo "  -is,  --ignore-signature    build package without checking signature"
	echo "  -eo,  --extract-only        stop after downloading and extracting source file(s)"
	echo "  -ns,  --no-strip            do not strip executable binaries or libraries"
	echo "  -kw,  --keep-work           keep temporary working directory"
	echo "  -if,  --ignore-footprint    build package without checking footprint"
	echo "  -in,  --ignore-new          build package, ignoring new files in a footprint mismatch"
	echo "  -i,   --install             build and install package"
	echo "  -u,   --upgrade             build and upgrade package"
}

validate_pkgfile() { # called from within PKGMK_ROOT
	local errcode kv
	[ -f Pkgfile ] || { error "no Pkgfile found. $PKGMK_ROOT is not a valid ports directory."; return "$E_PKGFILE"; }
	check_signature "pre-Pkgfile" | parse_signify_output
	errcode=$?
	[ "$errcode" = 0 ] || info "Use '-is' if you have independent confirmation of the port's integrity."
	[ "$errcode" = 0 ] || [ "$PKGMK_IGNORE_SIG" = "yes" ] || return $E_SIGNATURE

	# the environment should not be affected by sourcing the Pkgfile both here
	# and in the later build, but to be safe we use a nested subshell
	( . Pkgfile; kv=0; [ -n "$name" ] || kv+=1; [ -n "$version" ] || kv+=2; \
	[ -n "$release" ] || kv+=4; [ "$(type -t build)" = "function" ] || kv+=8; \
	echo $kv ) | check_reqvars
}

check_reqvars () {
	local checksum nullvars;
	read -r checksum
	[ $((checksum & 1)) = 1 ] && nullvars=" 'name'"
	[ $((checksum & 2)) = 2 ] && nullvars+=" 'version'"
	[ $((checksum & 4)) = 4 ] && nullvars+=" 'release'"
	[ $((checksum & 8)) = 8 ] && nullvars+=" 'build()'"
	[ "$checksum" = 0 ] || { error "Pkgfile does not specify these required variables:"; \
	info "$nullvars"; return "$E_PKGFILE"; }
}

check_pkg_mtime() { # can be called even if some sources are missing
	local li=0; local utd=0; local msg="$package is not up to date."

	if [ -f "$pkg_dir$package" ]; then
		utd=1
		while (( li < ${#_local_[@]} )) && [ "$utd" = 1 ]; do
			 [ ! -e "${_local_[li]}" ] || \
			[ "$pkg_dir$package" -nt "$(realpath "${_local_[$li]}")" ] || utd=0
			 li=$(( li+1 ))
		done
		[ ! -e "$PKGMK_ROOT/Pkgfile" ] || [ "$pkg_dir$package" -nt "$PKGMK_ROOT/Pkgfile" ] || utd=0
	fi

	[ $utd = 0 ] || msg="$package is up to date."
	[ "$PKGMK_MTIME_ONLY" = "yes" ] && info "$msg"; return $utd
}

fetch_url() {
	local u="$1"; local h="$2"; local finished=0; local giturl tag CLONE_ARGS
	local SAVE_AS REPO OCONTINUE OOUT; local m=0

	if [[ "$u" =~ ^__git__ ]]; then
			# git must be installed in order to obtain such a source
			[ -x "$PKGMK_GIT_COMMAND" ] || return 1;
			#
			giturl="${u#__git__}"
			# Did the port maintainer specify a branch other than 'main'?
			tag="${giturl##*\#}"
			[ "$tag" = "$giturl" ] || { giturl="${giturl%\#*}";
				CLONE_ARGS=(-c advice.detachedHead=false --branch "$tag"); }
			#
			# Has this project been downloaded before?
			if [ -d "$src_dir/$h.partial" ]; then
			    ln -s "$src_dir/$h.partial" "$h"; cd "$h"
			    "$PKGMK_GIT_COMMAND" pull "$giturl" "$tag"
				finished=$?; cd ..
			else
			    "$PKGMK_GIT_COMMAND" clone "$giturl" "${CLONE_ARGS[@]}" "$h.partial"
			    finished=$?; [ "$src_dir" = "" ] || { mv "$h.partial" "$src_dir";
						ln -s "$src_dir/$h.partial" "$h"; }
			fi
			return $finished;
	else
			case "$PKGMK_DOWNLOAD_PROG" in
				*wget)  OCONTINUE="-c"
						OOUT="--compression=none --passive-ftp
						--no-directories --tries=3 --waitretry=3
						$PKGMK_WGET_OPTIONS -O" ;;
				*curl)  OCONTINUE="-C -"
						OOUT="-L -# --fail --ftp-pasv
								--retry 3 --retry-delay 3
								$PKGMK_CURL_OPTIONS -o" ;;
				*) SAVE_AS="false" ;;
			esac
			#
			# start with the mirrors defined in pkgmk.conf, then go to the url found in the Pkgfile
			while (( m <= ${#PKGMK_SOURCE_MIRRORS[@]} )) && [ $finished = 0 ] \
					&& [ "$SAVE_AS" != "false" ]; do
				[ "${PKGMK_SOURCE_MIRRORS[m]}" = "" ] && um=$u || \
				{ REPO=${PKGMK_SOURCE_MIRRORS[m]%/}; um=$REPO/${u##*/}; }
				m=$(( m+1 ))
			# interrupted downloads from a previous run should be put where wget or curl will find them
				[ -f "$src_dir/$h.partial" ] && { ln -s "$src_dir/$h.partial" . ;
				SAVE_AS="$PKGMK_DOWNLOAD_PROG $um $OCONTINUE $OOUT"; } \
						|| SAVE_AS="$PKGMK_DOWNLOAD_PROG $um $OOUT"
				if $SAVE_AS "$h.partial"; then
					finished=1
					[ "$src_dir" = "" ] || [ ! -w "$src_dir"/ ] || \
					{ mv "$h.partial" "$src_dir/$h"; ln -sf "$src_dir/$h" . ; }
				else # an interrupted download should not have its efforts destroyed by cleanup_work()
					[ ! -s "$h.partial" ] || [ "$src_dir" = "" ] || \
							[ ! -w "$src_dir"/ ] || mv "$h.partial" "$src_dir"
				fi
			done
	fi
}

cat_footprint() {
	pkginfo --footprint "$pkg_dir$package" \
	| sed "s|\tlib/modules/$(uname -r)/|\tlib/modules/<kernel-version>/|g" \
	| sort -k 3
}

check_footprint() {
	local CN CM
	local TRUTH="$PKGMK_ROOT/.footprint"; local diffs=0; local severity=error;
	[ -f "$pkg_dir$package" ] || \
		{ error "$package not found. Cannot check footprint."; exit "$E_FOOTPRINT"; }

	if [ -f "$TRUTH" ]; then
		diff -w -t -U 0 <(sort "$TRUTH") <(cat_footprint | sort) | \
		sed '/^@@/d; /^+++/d; /^---/d; s/^+/NEW    /g; s/^-/MISSING /g' > ".footprint.diff"
		if [ -s ".footprint.diff" ]; then
			CN=$(grep -c ^NEW ".footprint.diff"); CM=$(grep -c ^MISSING ".footprint.diff")
			[ "$PKGMK_IGNORE_MISSING" = "yes" ] || diffs=$CM
			[ "$PKGMK_IGNORE_NEW" = "yes" ] || diffs=$(( diffs+CN ))
			(( diffs == 0 )) && severity=warning
			$severity "footprint mismatch found:"; cat ".footprint.diff" >&2
		fi
		rm ".footprint.diff"
	else
		warning "footprint not found, creating new."; cat_footprint > "$TRUTH"
	fi
	(( diffs == 0 )) || exit $E_FOOTPRINT
}

parse_signify_output() { # chomps the output of check_signature()
	local signout signerr
	[ "$PKGMK_IGNORE_SIG" = "yes" ] && return 0
	while read -r signout; do
	case "$signout" in 
		*"Pkgfile verification failed")
			signerr=-1; error "Signature missing! Unable to authenticate the Pkgfile."
			;;
		*"verification failed")
			signerr=1; error "Signature file corrupted or unreadable."
			;;
		*"FAIL")
			signerr=2; error "Signature mismatch found:"
			echo "$signout" | awk -F: '/FAIL/ {printf "MISMATCH   %s\n", $1}'
			;;
		*"OK") signerr=0 ;;
	esac
	done
	return $signerr
}

check_signature() { # called from $PKGMK_ROOT in the case "when"="pre-Pkgfile",
                    # otherwise called from within $work.
	local reqfiles=(Pkgfile); local s=0; local when="$1";
	local SIGNIFY_ARGS=(-C -x "$PKGMK_ROOT/.signature")

	[ -n "$PKGMK_PUBLICKEY" ] || PKGMK_PUBLICKEY="$(get_repo_key public)"
	if [ -f "$PKGMK_ROOT/.signature" ]; then
		[ "$when" = "pre-Pkgfile" ] || reqfiles=(.footprint)
		while [ "$when" = "pre-build" ] && (( s < ${#_local_[@]} )); do 
			[[ "${source[s]}" =~ ^__git__ ]] || reqfiles+=("${_local_[s]}")
			s=$(( s+1 ))
		done
		for FILE in "${reqfiles[@]}"; do
			[ -e "$FILE" ] || ln -sf "$PKGMK_ROOT/$FILE" .
		done
		[ -r "$PKGMK_PUBLICKEY" ] && SIGNIFY_ARGS+=(-p "$PKGMK_PUBLICKEY")
		/usr/bin/signify "${SIGNIFY_ARGS[@]}" "${reqfiles[@]}" 2>&1
	else
		[ "$when" = "pre-Pkgfile" ] && echo "Pkgfile verification failed"
		[ "$when" != "pre-Pkgfile" ] && echo "signature verification failed"
	fi
}

get_repo_key() {
	local typ="${1:0:3}"; local REPO;
	REPO=$(dirname "$PKGMK_ROOT"); REPO=$(basename -s .git "$REPO");
	ls "/etc/ports/$REPO.$typ" 2>/dev/null \
			|| ls "$HOME/.ssh/$REPO.$typ" 2>/dev/null
}

make_signature() {
	local ordered si pub
	[ -w "$PKGMK_ROOT/.signature" ] || { error ".signature not writable."; return $E_DIRPERM; }

	[ -n "$PKGMK_PRIVATEKEY" ] || PKGMK_PRIVATEKEY="$(get_repo_key secret)"
	if [ -n "$PKGMK_PRIVATEKEY" ]; then
		pub="/etc/ports/$(basename -s .sec "$PKGMK_PRIVATEKEY").pub"
	else
		error "No suitable secret key found. Specify one explicitly with '-sk'."
		return $E_SIGNATURE
	fi

	# create a new .signature, or refresh an existing manifest?
	case "$1" in
		new)
			[ -e "$PKGMK_ROOT/.footprint" ] || \
					warning "Footprint not found, signature will be incomplete."
			for f in "$PKGMK_ROOT/Pkgfile" "$PKGMK_ROOT/.footprint"; do
					[ -e "$f" ] && ordered+=( "$f" )
		   	done
			for ((si=0; si < ${#source[@]}; si++)); do
				# ignore git directories when writing the signature
				[[ "${source[si]}" =~ ^__git__ ]] || ordered+=("${_local_[si]}")
			done
			sha256sum --tag "${ordered[@]}" \
				| sed 's|^SHA256 (.*/\(.*\))\(.* = .*\)|SHA256 (\1)\2|' \
				| /usr/bin/signify -S -e -x - -q -s "$PKGMK_PRIVATEKEY" -m - \
				| sed "s|${PKGMK_PRIVATEKEY%.sec}.pub|$pub|" \
				> "$PKGMK_ROOT/.signature"
		;;
		refresh)
			[ -e ".signature" ] || \
				{ error "missing .signature, cannot refresh."; return $E_SIGNATURE; }
			if tail -n +3 ".signature" | /usr/bin/signify -S -e -x - -q \
				-s "$PKGMK_PRIVATEKEY" -m - > .signature.tmp; then
				mv .signature.tmp .signature
			else
				rm .signature.tmp; return $E_SIGNATURE
			fi
		;;
	esac
}

interrupted() {
	error "Interrupted."; cleanup_work; exit 1
}

cleanup_work() {
	[ "$PKGMK_KEEP_WORK" = "yes" ] || { cd "$PKGMK_ROOT"; rm -rf "$work"; }
}

info() {
	echo "=======> $1"
}

warning() {
	info "WARNING: $1" >&2
}

error() {
	info "ERROR: $1" >&2
}

######################## end of subroutines ###########################
## Now ensure that they cannot be overwritten when sourcing Pkgfile  ##
readonly -f main info warning error print_help parse_options validate_pkgfile \
	check_reqvars check_pkg_mtime fetch_url cat_footprint check_footprint \
	make_signature get_repo_key check_signature parse_signify_output cleanup_work
trap "interrupted" SIGHUP SIGINT SIGQUIT SIGTERM

export LC_ALL=C.UTF-8
main "$@"