From 88204bfa82f982a986d2aa3e166a4c5946040308 Mon Sep 17 00:00:00 2001
From: Ansuel Smith <ansuelsmth@gmail.com>
Date: Thu, 25 Nov 2021 02:12:58 +0100
Subject: [PATCH] treewide: drop use of which

Ubuntu started to flag which as deprecated and it
seems which is not really standard and may vary
across Distro.
Drop the use of which and use the standard 'command -v'
for this simple task.
Which is still present in the prereq if some package/script
still use which.
A utility script called command_all.sh is implemented that
will just mimic the output of which -a.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
---
 Makefile                  |  2 +-
 include/bpf.mk            |  2 +-
 include/cmake.mk          |  2 +-
 include/prereq.mk         |  4 ++--
 scripts/command_all.sh    | 11 +++++++++++
 scripts/download.pl       |  4 +---
 scripts/feeds             |  2 +-
 scripts/ubinize-image.sh  |  2 +-
 target/sdk/files/Makefile |  2 +-
 9 files changed, 20 insertions(+), 11 deletions(-)
 create mode 100755 scripts/command_all.sh

diff --git a/Makefile b/Makefile
index 39ab3ae4a52e..d85df6c3cf61 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ $(if $(findstring $(space),$(TOPDIR)),$(error ERROR: The path to the OpenWrt dir
 
 world:
 
-DISTRO_PKG_CONFIG:=$(shell which -a pkg-config | grep -E '\/usr' | head -n 1)
+DISTRO_PKG_CONFIG:=$(shell $(TOPDIR)/scripts/command_all.sh pkg-config | grep -E '\/usr' | head -n 1)
 export PATH:=$(TOPDIR)/staging_dir/host/bin:$(PATH)
 
 ifneq ($(OPENWRT_BUILD),1)
diff --git a/include/bpf.mk b/include/bpf.mk
index ce30e244345b..7d0cfbd76db4 100644
--- a/include/bpf.mk
+++ b/include/bpf.mk
@@ -10,7 +10,7 @@ ifneq ($(CONFIG_USE_LLVM_HOST),)
   else
     BPF_PATH:=$(PATH)
   endif
-  CLANG:=$(firstword $(shell PATH='$(BPF_PATH)' which clang clang-13 clang-12 clang-11))
+  CLANG:=$(firstword $(shell PATH='$(BPF_PATH)' command -v clang clang-13 clang-12 clang-11))
   LLVM_VER:=$(subst clang,,$(notdir $(CLANG)))
 endif
 ifneq ($(CONFIG_USE_LLVM_PREBUILT),)
diff --git a/include/cmake.mk b/include/cmake.mk
index b9a7e36dee8e..9b169b069346 100644
--- a/include/cmake.mk
+++ b/include/cmake.mk
@@ -24,7 +24,7 @@ MAKE_PATH = $(firstword $(CMAKE_BINARY_SUBDIR) .)
 ifeq ($(CONFIG_EXTERNAL_TOOLCHAIN),)
   cmake_tool=$(TOOLCHAIN_DIR)/bin/$(1)
 else
-  cmake_tool=$(shell which $(1))
+  cmake_tool=$(shell command -v $(1))
 endif
 
 ifeq ($(CONFIG_CCACHE),)
diff --git a/include/prereq.mk b/include/prereq.mk
index 23d5ded9b272..0033535e782a 100644
--- a/include/prereq.mk
+++ b/include/prereq.mk
@@ -49,7 +49,7 @@ endef
 
 define RequireCommand
   define Require/$(1)
-    which $(1)
+    command -v $(1)
   endef
 
   $$(eval $$(call Require,$(1),$(2)))
@@ -103,7 +103,7 @@ define SetupHostCommand
 	           $(call QuoteHostCommand,$(11)) $(call QuoteHostCommand,$(12)); do \
 		if [ -n "$$$$$$$$cmd" ]; then \
 			bin="$$$$$$$$(PATH="$(subst $(space),:,$(filter-out $(STAGING_DIR_HOST)/%,$(subst :,$(space),$(PATH))))" \
-				which "$$$$$$$${cmd%% *}")"; \
+				command -v "$$$$$$$${cmd%% *}")"; \
 			if [ -x "$$$$$$$$bin" ] && eval "$$$$$$$$cmd" >/dev/null 2>/dev/null; then \
 				mkdir -p "$(STAGING_DIR_HOST)/bin"; \
 				ln -sf "$$$$$$$$bin" "$(STAGING_DIR_HOST)/bin/$(strip $(1))"; \
diff --git a/scripts/command_all.sh b/scripts/command_all.sh
new file mode 100755
index 000000000000..452b66f092b1
--- /dev/null
+++ b/scripts/command_all.sh
@@ -0,0 +1,11 @@
+#! /bin/sh
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Reduced version of which -a using command utility
+
+case $PATH in
+	(*[!:]:) PATH="$PATH:" ;;
+esac
+
+for ELEMENT in $(echo $PATH | tr ":" "\n"); do
+        PATH=$ELEMENT command -v "$@"
+done
diff --git a/scripts/download.pl b/scripts/download.pl
index 8e6463c00761..ebb0d7af199f 100755
--- a/scripts/download.pl
+++ b/scripts/download.pl
@@ -54,10 +54,8 @@ sub localmirrors {
 
 sub which($) {
 	my $prog = shift;
-	my $res = `which $prog`;
+	my $res = `command -v $prog`;
 	$res or return undef;
-	$res =~ /^no / and return undef;
-	$res =~ /not found/ and return undef;
 	return $res;
 }
 
diff --git a/scripts/feeds b/scripts/feeds
index bbfd832c45e3..f63b4f0951b9 100755
--- a/scripts/feeds
+++ b/scripts/feeds
@@ -14,7 +14,7 @@ chdir $ENV{TOPDIR};
 $ENV{GIT_CONFIG_PARAMETERS}="'core.autocrlf=false'";
 $ENV{GREP_OPTIONS}="";
 
-my $mk=`which gmake 2>/dev/null`;	# select the right 'make' program
+my $mk=`command -v gmake 2>/dev/null`;	# select the right 'make' program
 chomp($mk);		# trim trailing newline
 $mk or $mk = "make";	# default to 'make'
 
diff --git a/scripts/ubinize-image.sh b/scripts/ubinize-image.sh
index 01956952409b..323eae547abc 100755
--- a/scripts/ubinize-image.sh
+++ b/scripts/ubinize-image.sh
@@ -134,7 +134,7 @@ if [ ! -r "$rootfs" -a ! -r "$kernel" -a ! "$outfile" ]; then
 	exit 1
 fi
 
-ubinize="$( which ubinize )"
+ubinize="$( command -v ubinize )"
 if [ ! -x "$ubinize" ]; then
 	echo "ubinize tool not found or not usable"
 	exit 1
diff --git a/target/sdk/files/Makefile b/target/sdk/files/Makefile
index 2f89ce0cf85c..a710ca5f5159 100644
--- a/target/sdk/files/Makefile
+++ b/target/sdk/files/Makefile
@@ -14,7 +14,7 @@ export TOPDIR LC_ALL LANG SDK
 
 world:
 
-DISTRO_PKG_CONFIG:=$(shell which -a pkg-config | grep -E '\/usr' | head -n 1)
+DISTRO_PKG_CONFIG:=$(shell $(TOPDIR)/scripts/command_all.sh pkg-config | grep -E '\/usr' | head -n 1)
 export PATH:=$(TOPDIR)/staging_dir/host/bin:$(PATH)
 
 ifneq ($(OPENWRT_BUILD),1)
-- 
2.30.2