shebang.req: Allow env with split-string arguments

Check for -S/--split-string= options, former could be (out of all
other options) prefixed only with `i`.

For now, this covers only the simplest cases where the first non-blank
word is the command name itself.

NB: /usr/bin/env -v is deliberately not supported.

Link: https://bugzilla.altlinux.org/50059
Signed-off-by: Vitaly Chikunov <vt@altlinux.org>

scripts/shebang.req.in

@@ -41,6 +41,13 @@ ShebangReq()
 		Warning "$f: trailing <CR> in arguments: $line"
 	}
 
+	GetEnvCmd()
+	{
+		shift
+		expr match "$*" "-i*S\s*\(\S\+\)" ||
+		expr match "$*" "--split-string=\s*\(\S\+\)"
+	}
+
 	local RPM_FINDPACKAGE_MANDATORY=1
 	case "$#,$1" in
 		1,*)
@@ -57,7 +64,10 @@ ShebangReq()
 			;;
 		*,/usr/bin/env)
 			CheckArgs "$*"
+			local cmd
+			cmd=$(GetEnvCmd "$@") ||
 				Fatal "$f: too many arguments: $line"
+			FindPackage "$f" "$cmd"
 			;;
 		*)
 			CheckArgs "$*"