isofs.sh: Test genisoimage, xorriso and mksisofs

Run test an all 3 tools: genisoimage, xorriso and mksisofs.

mkisofs, genisoimage and xorriso tools are present as separate tools in
some distros while in others they are symlinks to one another. Tests are
skipped on symlinks.

mkisofs supports only -hfs option
genisoimage supports both -hfs and -hfsplus options
xorrisofs supports only -hfsplus option

This actually fixes xorrisofs on CentOS which is a symlink to mkisofs
and because it does not supports -hfs test IMHO fails.

Link: https://lore.kernel.org/ltp/20240129092232.599010-1-pvorel@suse.cz/
Co-Authored-By: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>
Signed-off-by: Subramanya Swamy <subramanya.swamy.linux@gmail.com>
Signed-off-by: Petr Vorel <pvorel@suse.cz>

Author: subramanya-swamy-linux

testcases/kernel/fs/iso9660/isofs.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0-or-later
 # Copyright (c) International Business Machines Corp., 2003
-# Copyright (c) Linux Test Project, 2016-2021
+# Copyright (c) Linux Test Project, 2016-2024
 # Written by Prakash Narayana (prakashn@us.ibm.com)
 # and Michael Reed (mreed10@us.ibm.com)
 #
@@ -11,23 +11,12 @@
 
 TST_NEEDS_CMDS="mount umount"
 TST_NEEDS_TMPDIR=1
-TST_SETUP=setup
 TST_TESTFUNC=do_test
+TST_CNT=3
 
 MAX_DEPTH=3
 MAX_DIRS=4
 
-setup()
-{
-	if tst_cmd_available mkisofs; then
-		MKISOFS_CMD="mkisofs"
-	elif tst_cmd_available genisoimage; then
-		MKISOFS_CMD="genisoimage"
-	else
-		tst_brk TCONF "please install mkisofs or genisoimage"
-	fi
-}
-
 gen_fs_tree()
 {
 	local cur_path="$1"
@@ -50,10 +39,33 @@ do_test()
 	local make_file_sys_dir="$PWD/files"
 	local mkisofs_opt mount_opt
 
+	case $1 in
+		1) MKISOFS_CMD="mkisofs"
+			HFSOPT="-hfs -D"
+			GREPOPT="mkisofs";;
+		2) MKISOFS_CMD="genisoimage"
+			HFSOPT="-hfsplus -D -hfs -D"
+			GREPOPT="genisoimage";;
+		3) MKISOFS_CMD="xorrisofs"
+			HFSOPT="-hfsplus -D"
+			GREPOPT="xorriso";;
+	esac
+
+	if ! tst_cmd_available $MKISOFS_CMD; then
+		tst_res TCONF "Missing '$MKISOFS_CMD'"
+		return
+	fi
+
+	if ! $MKISOFS_CMD 2>&1 | head -n 2 | grep -q "$GREPOPT"; then
+		tst_res TCONF "'$MKISOFS_CMD' is a symlink to another tool"
+		return
+	fi
+
+	tst_res TINFO "Testing $MKISOFS_CMD"
+
 	mkdir -p -m 777 $mnt_point
 	mkdir -p $make_file_sys_dir
 
-	# Generated directories and files
 	mkdir -p $make_file_sys_dir
 	gen_fs_tree "$make_file_sys_dir" 1
 
@@ -62,15 +74,16 @@ do_test()
 	for mkisofs_opt in \
 		" " \
 		"-J" \
-		"-hfs -D" \
+		"$HFSOPT" \
 		" -R " \
 		"-R -J" \
 		"-f -l -D -J -allow-leading-dots -R" \
-		"-allow-lowercase -allow-multidot -iso-level 3 -f -l -D -J -allow-leading-dots -R"
+		"-allow-lowercase -allow-multidot -iso-level 3 -f -l -D -J \
+			-allow-leading-dots -R"
 	do
 		rm -f isofs.iso
-		EXPECT_PASS $MKISOFS_CMD -o isofs.iso -quiet $mkisofs_opt $make_file_sys_dir 2\> /dev/null \
-			|| continue
+		EXPECT_PASS $MKISOFS_CMD -o isofs.iso -quiet $mkisofs_opt \
+			$make_file_sys_dir 2\> /dev/null || continue
 
 		for mount_opt in \
 			"loop" \