commit 3827df94d66c75873c53f0949960a294d7a7f88a
Author: Leonid Krivoshein <klark@altlinux.org>
Date:   Sun Sep 26 04:48:04 2021 +0300

    fixed resolve_target(), reverse addressation added

diff --git a/bootchain-core/data/bin/bootchain-sh-functions b/bootchain-core/data/bin/bootchain-sh-functions
index 086d698..4f416d2 100644
--- a/bootchain-core/data/bin/bootchain-sh-functions
+++ b/bootchain-core/data/bin/bootchain-sh-functions
@@ -49,25 +49,33 @@ get_parameter()
 resolve_target()
 {
 	local target="$1"
+	local where="${target%%/*}"
+	local n="${#where}"
 
-	case "${target%%/*}" in
+	target="${target:$n}"
+
+	case "$where" in
 	'')
 		;;
 	pipe[0-9]|pipe[0-9][0-9]|pipe[0-9][0-9][0-9])
-		target="$mntdir/dst/step${target:4}"
+		n="$(( ${basestep:-0} + ${where:4} ))"
+		[ ! -d "$mntdir/dst/step$n" ] && return 0 ||
+			target="$mntdir/dst/step${n}${target}"
 		;;
-	step[0-9]|step[0-9][0-9]|step[0-9][0-9][0-9])
-		target="$mntdir/dst/$target"
+	step-[1-9]|step-[1-9][0-9]|step-[1-9][0-9][0-9])
+		n="$(( ${stepnum:-0} - ${where:5} ))"
+		[ "${basestep:-0}" -le "$n" ] && [ -d "$mntdir/dst/step$n" ] &&
+			target="$mntdir/dst/step${n}${target}" || return 0
 		;;
 	*)
 		if [ -z "${prevdir-}" ]; then
-			message "no previous step results to use with $PROG"
+			message "no previous step results to use with $name"
 			return 0
 		fi
-		if [ "$target" = DEVNAME ] && [ -s "$prevdir/DEVNAME" ]; then
-			read -r target <"$prevdir/DEVNAME" ||:
+		if [ "$where" = DEVNAME ] && [ -s "$prevdir/DEVNAME" ]; then
+			read -r target <"$prevdir/DEVNAME" 2>/dev/null ||:
 		else
-			target="$prevdir/${target#/}"
+			target="$prevdir/${where#/}${target}"
 		fi
 		;;
 	esac
diff --git a/bootchain-core/data/sbin/bootchain-loop b/bootchain-core/data/sbin/bootchain-loop
index 1cf00d3..59c2ac7 100755
--- a/bootchain-core/data/sbin/bootchain-loop
+++ b/bootchain-core/data/sbin/bootchain-loop
@@ -6,6 +6,7 @@ bcretry="${bcretry:-1}"
 stepnum="${stepnum:-0}"
 chainsteps="${chainsteps-}"
 prevdir="${prevdir-}"
+basestep="$stepnum"
 BC_IM_supported=
 
 
@@ -83,7 +84,8 @@ while [ -n "$chainsteps" ]; do
 		else
 			message "[$callnum] Handler: $exe"
 
-			export name callnum datadir destdir prevdir
+			export name callnum datadir destdir
+			export basestep stepnum prevdir
 
 			for try in 1 2 3 4 5; do
 				[ -z "$BC_DEBUG" ] ||
@@ -128,6 +130,7 @@ while [ -n "$chainsteps" ]; do
 		debug "chain will be reloaded by $BC_NEXTCHAIN:"
 		fdump "$BC_NEXTCHAIN"
 		. "$BC_NEXTCHAIN"
+		basestep="$stepnum"
 		run rm -f -- "$BC_NEXTCHAIN"
 	fi