From 2278170d29b0c5a61017a99b11b54b3abb92d57f Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Tue, 23 Apr 2019 13:23:52 -0400
Subject: substvars(): Sync with opkbuild

---
(limited to 'src')

diff --git a/src/substvars.sh b/src/substvars.sh
index 36ec308..ee845e3 100644
--- a/src/substvars.sh
+++ b/src/substvars.sh
@@ -87,9 +87,30 @@ substvars()
 		fi
 		old_rhs="${rhs}"
 
+		# Validate the variable name.
+		case "${name}" in *[!A-Za-z0-9-]* | '')
+			warn "$(get_msg 'substvar_invalid')" "${name}"
+			# Remove the variable expansion altogether.  We can't
+			# just leave the variable unexpanded, because the
+			# presence of the "${" characters would cause this
+			# parser to loop infinitely.
+			string="${lhs}${rhs}"
+			continue
+		esac
+
 		# Perform the substitution.
-		name="$(printf '%s\n' "${name}" | tr 'A-Z-' 'a-z_')"
-		value="$(eval "printf '%s\n' \"\${substvar_${name}}\"")"
+		name_tr="$(printf '%s' "${name}" | tr 'A-Z-' 'a-z_')"
+		package="$(printf '%s' "${package}" | tr 'A-Z' 'a-z' | \
+			tr -dC 'a-z0-9')"
+		if eval "[ x\"\${substvar_${name_tr}:+set}\" = x'set' ]"
+		then
+			name_tr="substvar_${name_tr}"
+		else
+			warn "$(get_msg 'substvar_unknown')" "${name}"
+			string="${lhs}${rhs}"
+			continue
+		fi
+		value="$(eval "printf '%s' \"\${${name_tr}}\"")"
 		string="${lhs}${value}${rhs}"
 		depth=$((${depth} + 1))
 	done
--
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