From 87888fb768b9a4da130357d0b3dbb56be1b033c1 Mon Sep 17 00:00:00 2001
From: Martijn Dekker <martijn@inlv.org>
Date: Tue, 9 Jan 2024 01:43:03 +0000
Subject: [PATCH] INIT: make.probe: get rid of obsolete SHELLMAGIC probe

Here is another small step towards cleaning up the build system.

The SHELLMAGIC probe (its result shows up as mam_cc_SHELLMAGIC in
the Mamfiles) checks for broken systems that absolutely must have a
hashbang path (#!/bin/sh, etc.) in order to run a shell script.
This does not describe any remotely current system. On systems
where a hashbang-less script fails, the probe only tested for:

1. #!/bin/env sh
2. #!/emx/bin/bash.exe
3. #!/emx/bin/sh.exe

Re 1, on all modern systems, env is at /usr/bin/env (it's become a
de facto standard), and re 2 and 3, those paths existed on OS/2
(last release more than two decades ago).

src/cmd/INIT/make.probe:
- Remove obsolete SHELLMAGIC probe.

src/cmd/INIT/Mamfile,
src/lib/libast/Mamfile:
- Remove use of mam_cc_SHELLMAGIC.
- Drastically simplify related generated shell code.
---
 src/cmd/INIT/Mamfile    | 257 ++--------------------------------------
 src/cmd/INIT/make.probe |  30 +----
 src/lib/libast/Mamfile  |  30 +----
 3 files changed, 10 insertions(+), 307 deletions(-)

diff --git a/src/cmd/INIT/Mamfile b/src/cmd/INIT/Mamfile
index a8a528892728..4d0acde16375 100644
--- a/src/cmd/INIT/Mamfile
+++ b/src/cmd/INIT/Mamfile
@@ -18,172 +18,27 @@ setv LDFLAGS
 make install
 	make iffe
 		prev iffe.sh
-		exec - case static,port:$OPTIND:$RANDOM in
-		exec - ?*:*:*|*::*|*:*:$RANDOM)
-		exec - ;;
-		exec - *) if ENV= LC_ALL=C x= $SHELL -nc '[[ a || b ]] && : ${list[level]}  !(pattern)' 2>/dev/null
-		exec - then if grep '### .*archaic.* ###' >/dev/null
-		exec - then : iffe contains archaic constructs :
-		exec - else ENV= LC_ALL=C $SHELL -n iffe.sh
-		exec - fi
-		exec - fi
-		exec - ;;
-		exec - esac
-		exec - case '${mam_cc_SHELLMAGIC}' in
-		exec - "") case 225 in
-		exec - 0) ${STDCP} iffe.sh iffe
-		exec - ;;
-		exec - *) {
-		exec - i=`(read x; echo $x) < iffe.sh`
-		exec - case $i in
-		exec - '#!'*|*'||'*|':'*|'":"'*|"':'"*) echo "$i" ;;
-		exec - esac
-		exec - ${STDCAT} iffe.sh
-		exec - } > iffe
-		exec - ;;
-		exec - esac
-		exec - ;;
-		exec - *) ${STDCAT} - iffe.sh > iffe <<'!'
-		exec - ${mam_cc_SHELLMAGIC}
-		exec - !
-		exec - ;;
-		exec - esac
+		exec - ${STDCP} iffe.sh iffe
 		exec - test -w iffe -a -x iffe || ${STDCHMOD} u+w,+x iffe
 	done iffe generated
 	make mktest
 		prev mktest.sh
-		exec - case static,port:$OPTIND:$RANDOM in
-		exec - ?*:*:*|*::*|*:*:$RANDOM)
-		exec - ;;
-		exec - *) if ENV= LC_ALL=C x= $SHELL -nc '[[ a || b ]] && : ${list[level]}  !(pattern)' 2>/dev/null
-		exec - then if grep '### .*archaic.* ###' >/dev/null
-		exec - then : mktest contains archaic constructs :
-		exec - else ENV= LC_ALL=C $SHELL -n mktest.sh
-		exec - fi
-		exec - fi
-		exec - ;;
-		exec - esac
-		exec - case '${mam_cc_SHELLMAGIC}' in
-		exec - "") case 184 in
-		exec - 0) ${STDCP} mktest.sh mktest
-		exec - ;;
-		exec - *) {
-		exec - i=`(read x; echo $x) < mktest.sh`
-		exec - case $i in
-		exec - '#!'*|*'||'*|':'*|'":"'*|"':'"*) echo "$i" ;;
-		exec - esac
-		exec - ${STDCAT} mktest.sh
-		exec - } > mktest
-		exec - ;;
-		exec - esac
-		exec - ;;
-		exec - *) ${STDCAT} - mktest.sh > mktest <<'!'
-		exec - ${mam_cc_SHELLMAGIC}
-		exec - !
-		exec - ;;
-		exec - esac
+		exec - ${STDCP} mktest.sh mktest
 		exec - test -w mktest -a -x mktest || ${STDCHMOD} u+w,+x mktest
 	done mktest generated
 	make package
 		prev package.sh
-		exec - case static,port:$OPTIND:$RANDOM in
-		exec - ?*:*:*|*::*|*:*:$RANDOM)
-		exec - ;;
-		exec - *) if ENV= LC_ALL=C x= $SHELL -nc '[[ a || b ]] && : ${list[level]}  !(pattern)' 2>/dev/null
-		exec - then if grep '### .*archaic.* ###' >/dev/null
-		exec - then : package contains archaic constructs :
-		exec - else ENV= LC_ALL=C $SHELL -n package.sh
-		exec - fi
-		exec - fi
-		exec - ;;
-		exec - esac
-		exec - case '${mam_cc_SHELLMAGIC}' in
-		exec - "") case 184 in
-		exec - 0) ${STDCP} package.sh package
-		exec - ;;
-		exec - *) {
-		exec - i=`(read x; echo $x) < package.sh`
-		exec - case $i in
-		exec - '#!'*|*'||'*|':'*|'":"'*|"':'"*) echo "$i" ;;
-		exec - esac
-		exec - ${STDCAT} package.sh
-		exec - } > package
-		exec - ;;
-		exec - esac
-		exec - ;;
-		exec - *) ${STDCAT} - package.sh > package <<'!'
-		exec - ${mam_cc_SHELLMAGIC}
-		exec - !
-		exec - ;;
-		exec - esac
+		exec - ${STDCP} package.sh package
 		exec - test -w package -a -x package || ${STDCHMOD} u+w,+x package
 	done package generated
 	make regress
 		prev regress.sh
-		exec - case static,port:$OPTIND:$RANDOM in
-		exec - ?*:*:*|*::*|*:*:$RANDOM)
-		exec - ;;
-		exec - *) if ENV= LC_ALL=C x= $SHELL -nc '[[ a || b ]] && : ${list[level]}  !(pattern)' 2>/dev/null
-		exec - then if grep '### .*archaic.* ###' >/dev/null
-		exec - then : regress contains archaic constructs :
-		exec - else ENV= LC_ALL=C $SHELL -n regress.sh
-		exec - fi
-		exec - fi
-		exec - ;;
-		exec - esac
-		exec - case '${mam_cc_SHELLMAGIC}' in
-		exec - "") case 184 in
-		exec - 0) ${STDCP} regress.sh regress
-		exec - ;;
-		exec - *) {
-		exec - i=`(read x; echo $x) < regress.sh`
-		exec - case $i in
-		exec - '#!'*|*'||'*|':'*|'":"'*|"':'"*) echo "$i" ;;
-		exec - esac
-		exec - ${STDCAT} regress.sh
-		exec - } > regress
-		exec - ;;
-		exec - esac
-		exec - ;;
-		exec - *) ${STDCAT} - regress.sh > regress <<'!'
-		exec - ${mam_cc_SHELLMAGIC}
-		exec - !
-		exec - ;;
-		exec - esac
+		exec - ${STDCP} regress.sh regress
 		exec - test -w regress -a -x regress || ${STDCHMOD} u+w,+x regress
 	done regress generated
 	make crossexec
 		prev crossexec.sh
-		exec - case static,port:$OPTIND:$RANDOM in
-		exec - ?*:*:*|*::*|*:*:$RANDOM)
-		exec - ;;
-		exec - *) if ENV= LC_ALL=C x= $SHELL -nc '[[ a || b ]] && : ${list[level]}  !(pattern)' 2>/dev/null
-		exec - then if grep '### .*archaic.* ###' >/dev/null
-		exec - then : crossexec contains archaic constructs :
-		exec - else ENV= LC_ALL=C $SHELL -n crossexec.sh
-		exec - fi
-		exec - fi
-		exec - ;;
-		exec - esac
-		exec - case '${mam_cc_SHELLMAGIC}' in
-		exec - "") case 184 in
-		exec - 0) ${STDCP} crossexec.sh crossexec
-		exec - ;;
-		exec - *) {
-		exec - i=`(read x; echo $x) < crossexec.sh`
-		exec - case $i in
-		exec - '#!'*|*'||'*|':'*|'":"'*|"':'"*) echo "$i" ;;
-		exec - esac
-		exec - ${STDCAT} crossexec.sh
-		exec - } > crossexec
-		exec - ;;
-		exec - esac
-		exec - ;;
-		exec - *) ${STDCAT} - crossexec.sh > crossexec <<'!'
-		exec - ${mam_cc_SHELLMAGIC}
-		exec - !
-		exec - ;;
-		exec - esac
+		exec - ${STDCP} crossexec.sh crossexec
 		exec - test -w crossexec -a -x crossexec || ${STDCHMOD} u+w,+x crossexec
 	done crossexec generated
 	make mamake
@@ -198,76 +53,12 @@ make install
 	done mamake generated
 	make mkreq
 		prev mkreq.sh
-		exec - case static,port:$OPTIND:$RANDOM in
-		exec - ?*:*:*|*::*|*:*:$RANDOM)
-		exec - ;;
-		exec - *) if ENV= LC_ALL=C x= $SHELL -nc '[[ a || b ]] && : ${list[level]}  !(pattern)' 2>/dev/null
-		exec - then if grep '### .*archaic.* ###' >/dev/null
-		exec - then : mkreq contains archaic constructs :
-		exec - else ENV= LC_ALL=C $SHELL -n mkreq.sh
-		exec - fi
-		exec - fi
-		exec - ;;
-		exec - esac
-		exec - case '${mam_cc_SHELLMAGIC}' in
-		exec - "") case 0 in
-		exec - 0) ${STDCP} mkreq.sh mkreq
-		exec - ;;
-		exec - *) {
-		exec - i=`(read x; echo $x) < mkreq.sh`
-		exec - case $i in
-		exec - '#!'*|*'||'*|':'*|'":"'*|"':'"*) echo "$i" ;;
-		exec - esac
-		exec - ${STDCAT} - mkreq.sh <<'!'
-		exec -
-		exec - !
-		exec - } > mkreq
-		exec - ;;
-		exec - esac
-		exec - ;;
-		exec - *) ${STDCAT} - mkreq.sh > mkreq <<'!'
-		exec - ${mam_cc_SHELLMAGIC}
-		exec -
-		exec - !
-		exec - ;;
-		exec - esac
+		exec - ${STDCP} mkreq.sh mkreq
 		exec - test -w mkreq -a -x mkreq || ${STDCHMOD} u+w,+x mkreq
 	done mkreq generated
 	make mprobe
 		prev mprobe.sh
-		exec - case static,port:$OPTIND:$RANDOM in
-		exec - ?*:*:*|*::*|*:*:$RANDOM)
-		exec - ;;
-		exec - *) if ENV= LC_ALL=C x= $SHELL -nc '[[ a || b ]] && : ${list[level]}  !(pattern)' 2>/dev/null
-		exec - then if grep '### .*archaic.* ###' >/dev/null
-		exec - then : mprobe contains archaic constructs :
-		exec - else ENV= LC_ALL=C $SHELL -n mprobe.sh
-		exec - fi
-		exec - fi
-		exec - ;;
-		exec - esac
-		exec - case '${mam_cc_SHELLMAGIC}' in
-		exec - "") case 0 in
-		exec - 0) ${STDCP} mprobe.sh mprobe
-		exec - ;;
-		exec - *) {
-		exec - i=`(read x; echo $x) < mprobe.sh`
-		exec - case $i in
-		exec - '#!'*|*'||'*|':'*|'":"'*|"':'"*) echo "$i" ;;
-		exec - esac
-		exec - ${STDCAT} - mprobe.sh <<'!'
-		exec -
-		exec - !
-		exec - } > mprobe
-		exec - ;;
-		exec - esac
-		exec - ;;
-		exec - *) ${STDCAT} - mprobe.sh > mprobe <<'!'
-		exec - ${mam_cc_SHELLMAGIC}
-		exec -
-		exec - !
-		exec - ;;
-		exec - esac
+		exec - ${STDCP} mprobe.sh mprobe
 		exec - test -w mprobe -a -x mprobe || ${STDCHMOD} u+w,+x mprobe
 	done mprobe generated
 	make probe
@@ -276,39 +67,7 @@ make install
 			prev make.probe
 			exec - ${STDCAT} C+probe make.probe > probe.sh
 		done probe.sh generated
-		exec - case static,port:$OPTIND:$RANDOM in
-		exec - ?*:*:*|*::*|*:*:$RANDOM)
-		exec - ;;
-		exec - *) if ENV= LC_ALL=C x= $SHELL -nc '[[ a || b ]] && : ${list[level]}  !(pattern)' 2>/dev/null
-		exec - then if grep '### .*archaic.* ###' >/dev/null
-		exec - then : probe contains archaic constructs :
-		exec - else ENV= LC_ALL=C $SHELL -n probe.sh
-		exec - fi
-		exec - fi
-		exec - ;;
-		exec - esac
-		exec - case '${mam_cc_SHELLMAGIC}' in
-		exec - "") case 0 in
-		exec - 0) ${STDCP} probe.sh probe
-		exec - ;;
-		exec - *) {
-		exec - i=`(read x; echo $x) < probe.sh`
-		exec - case $i in
-		exec - '#!'*|*'||'*|':'*|'":"'*|"':'"*) echo "$i" ;;
-		exec - esac
-		exec - ${STDCAT} - probe.sh <<'!'
-		exec -
-		exec - !
-		exec - } > probe
-		exec - ;;
-		exec - esac
-		exec - ;;
-		exec - *) ${STDCAT} - probe.sh > probe <<'!'
-		exec - ${mam_cc_SHELLMAGIC}
-		exec -
-		exec - !
-		exec - ;;
-		exec - esac
+		exec - ${STDCP} probe.sh probe
 		exec - test -w probe -a -x probe || ${STDCHMOD} u+w,+x probe
 	done probe generated
 	make ${INSTALLROOT}/bin
diff --git a/src/cmd/INIT/make.probe b/src/cmd/INIT/make.probe
index 7281f0504cb8..2f4f6b82af24 100644
--- a/src/cmd/INIT/make.probe
+++ b/src/cmd/INIT/make.probe
@@ -3,7 +3,7 @@
 # Glenn Fowler
 # AT&T Research
 #
-# @(#)make.probe (ksh 93u+m) 2024-01-02
+# @(#)make.probe (ksh 93u+m) 2024-01-09
 #
 # C probe for make
 #
@@ -163,7 +163,6 @@ runpath=
 shared=
 shared_name=
 shared_registry=
-shellmagic=
 soversion=
 stdc=
 strict=
@@ -1772,31 +1771,6 @@ int lib(int** def, int** ref, int** ext)
 	;;
 esac
 
-# shellmagic defined if installed shell scripts need magic
-
-echo ': got magic :
-echo ok' > ok
-chmod +x ok
-case `(eval ./ok | /bin/sh) 2>/dev/null` in
-ok)	;;
-*)	echo '#!/bin/env sh
-: got magic :
-echo ok' > ok
-	chmod +x ok
-	case `(eval ./ok | /bin/sh) 2>/dev/null` in
-	ok)	shellmagic='$("#")!/bin/env sh'
-		;;
-	*)	for i in /emx/bin/bash.exe /emx/bin/sh.exe
-		do	if	test -x $i
-			then	shellmagic='$("#")!'$i
-				break
-			fi
-		done
-		;;
-	esac
-	;;
-esac
-
 #
 # path cleanup
 #
@@ -1994,7 +1968,6 @@ CC_SHARED_LD=$dld
 CC_SHARED_NAME=$shared_name
 CC_SHARED_REGISTRY=$shared_registry
 CC_SHARED_REGISTRY_PATH=$probe_shared_registry_path
-CC_SHELLMAGIC=$shellmagic
 CC_SIZE=$size
 CC_STATIC=$static
 CC_STDINCLUDE=$stdinclude
@@ -2107,7 +2080,6 @@ echo CC.SHARED.LD = $CC_SHARED_LD
 echo CC.SHARED.NAME = $CC_SHARED_NAME
 echo CC.SHARED.REGISTRY = $CC_SHARED_REGISTRY
 echo CC.SHARED.REGISTRY.PATH = $CC_SHARED_REGISTRY_PATH
-echo CC.SHELLMAGIC = $CC_SHELLMAGIC
 echo CC.SIZE = $CC_SIZE
 echo CC.STATIC = $CC_STATIC
 echo CC.STDINCLUDE = $CC_STDINCLUDE
diff --git a/src/lib/libast/Mamfile b/src/lib/libast/Mamfile
index 951891fa3576..f627d12cc172 100644
--- a/src/lib/libast/Mamfile
+++ b/src/lib/libast/Mamfile
@@ -139,39 +139,11 @@ make install
 							make conflim.h implicit
 								make conf
 									prev comp/conf.sh
-									exec - case static,port:$OPTIND:$RANDOM in
-									exec - ?*:*:*|*::*|*:*:$RANDOM)
-									exec - ;;
-									exec - *) if ENV= LC_ALL=C x= $SHELL -nc '[[ a || b ]] && : ${list[level]}  !(pattern)' 2>/dev/null
-									exec - then if grep '### .*archaic.* ###' >/dev/null
-									exec - then : conf contains archaic constructs :
-									exec - else ENV= LC_ALL=C $SHELL -n comp/conf.sh
-									exec - fi
-									exec - fi
-									exec - ;;
-									exec - esac
-									exec - case '${mam_cc_SHELLMAGIC}' in
-									exec - "") case 29 in
-									exec - 0) ${STDCP} comp/conf.sh conf
-									exec - ;;
-									exec - *) {
-									exec - i=`(read x; echo $x) < comp/conf.sh`
-									exec - case $i in
-									exec - '#!'*|*'||'*|':'*|'":"'*|"':'"*) echo "$i" ;;
-									exec - esac
+									exec - {
 									exec - ${STDCAT} - comp/conf.sh <<'!'
 									exec - HOSTTYPE="${mam_cc_HOSTTYPE}"
 									exec - !
 									exec - } > conf
-									exec - ;;
-									exec - esac
-									exec - ;;
-									exec - *) ${STDCAT} - comp/conf.sh > conf <<'!'
-									exec - ${mam_cc_SHELLMAGIC}
-									exec - HOSTTYPE="${mam_cc_HOSTTYPE}"
-									exec - !
-									exec - ;;
-									exec - esac
 									exec - test -w conf -a -x conf || ${STDCHMOD} u+w,+x conf
 								done conf generated
 								prev comp/conf.tab