From 240eaa6425625f587219ce0cc02801f41c0e4067 Mon Sep 17 00:00:00 2001
From: bol-van <none@none.none>
Date: Wed, 1 Jun 2022 22:03:27 +0300
Subject: [PATCH] install_bin: glibc execvp calls /bin/sh. use bash if possible

---
 install_bin.sh | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/install_bin.sh b/install_bin.sh
index e553098..ef1cd99 100755
--- a/install_bin.sh
+++ b/install_bin.sh
@@ -5,6 +5,11 @@ EXEDIR="$(cd "$EXEDIR"; pwd)"
 BINS=binaries
 BINDIR="$EXEDIR/$BINS"
 
+exists()
+{
+	which "$1" >/dev/null 2>/dev/null
+}
+
 check_dir()
 {
 	local dir="$BINDIR/$1"
@@ -13,8 +18,15 @@ check_dir()
 	if [ -f "$exe" ]; then
 		if [ -x "$exe" ]; then
 			# ash and dash try to execute invalid executables as a script. they interpret binary garbage with possible negative consequences
-			# find do not use shell exec
-			out=$(echo 0.0.0.0 | find "$dir" -maxdepth 1 -name ip2net -exec {} \; 2>/dev/null)
+			# bash do not do this
+			if exists bash; then
+				out=$(echo 0.0.0.0 | bash -c "$exe" 2>/dev/null)
+			else
+				# find do not use its own shell exec
+				# it uses execvp(). in musl libc it does not call shell, in glibc it DOES call /bin/sh
+				# that's why prefer bash if present
+				out=$(echo 0.0.0.0 | find "$dir" -maxdepth 1 -name ip2net -exec {} \; 2>/dev/null)
+			fi
 			[ -n "$out" ]
 		else
 			echo "$exe is not executable. set proper chmod."