testcaes/lib: Add shell loader

This commit implements a shell loader so that we don't have to write a C
loader for each LTP shell test. The idea is simple, the loader parses
the shell test and prepares the tst_test structure accordingly, then
runs the actual shell test.

The format for the metadata in the shell test was choosen to be JSON
because:

- I didn't want to invent an adhoc format and JSON is perfect for
  serializing data structures
- The metadata parser for shell test will be trivial, it will just pick
  the JSON from the comment, no parsing will be required

Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
Reviewed-by: Richard Palethorpe <io@richiejp.com>
Reviewed-by: Li Wang <liwang@redhat.com>

include/tst_test.h

@@ -274,7 +274,7 @@ struct tst_fs {
 	const char *const *mkfs_opts;
 	const char *mkfs_size_opt;
 
-	const unsigned int mnt_flags;
+	unsigned int mnt_flags;
 	const void *mnt_data;
 };
 

testcases/lib/.gitignore

@@ -24,3 +24,4 @@
 /tst_supported_fs
 /tst_timeout_kill
 /tst_res_
+/tst_run_shell

testcases/lib/Makefile

@@ -4,6 +4,9 @@
 
 top_srcdir		?= ../..
 
+LTPLIBS = ujson
+tst_run_shell: LTPLDLIBS = -lujson
+
 include $(top_srcdir)/include/mk/testcases.mk
 
 INSTALL_TARGETS		:= *.sh
@@ -13,6 +16,7 @@ MAKE_TARGETS		:= tst_sleep tst_random tst_checkpoint tst_rod tst_kvcmp\
 			   tst_getconf tst_supported_fs tst_check_drivers tst_get_unused_port\
 			   tst_get_median tst_hexdump tst_get_free_pids tst_timeout_kill\
 			   tst_check_kconfigs tst_cgctl tst_fsfreeze tst_ns_create tst_ns_exec\
-			   tst_ns_ifmove tst_lockdown_enabled tst_secureboot_enabled tst_res_
+			   tst_ns_ifmove tst_lockdown_enabled tst_secureboot_enabled tst_res_\
+			   tst_run_shell
 
 include $(top_srcdir)/include/mk/generic_trunk_target.mk

testcases/lib/run_tests.sh

@@ -9,3 +9,24 @@ for i in `seq -w 01 06`; do
 	echo
 	./tests/shell_test$i
 done
+
+for i in shell_loader.sh shell_loader_all_filesystems.sh shell_loader_no_metadata.sh \
+	 shell_loader_wrong_metadata.sh shell_loader_invalid_metadata.sh\
+	 shell_loader_supported_archs.sh shell_loader_filesystems.sh\
+	 shell_loader_tcnt.sh shell_loader_kconfigs.sh shell_loader_tags.sh \
+	 shell_loader_invalid_block.sh; do
+	echo
+	echo "*** Running $i ***"
+	echo
+	$i
+done
+
+echo
+echo "*** Testing LTP test -h option ***"
+echo
+shell_loader.sh -h
+
+echo
+echo "*** Testing LTP test -i option ***"
+echo
+shell_loader.sh -i 2

testcases/lib/tests/shell_loader.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+#
+# ---
+# doc
+#
+# [Description]
+#
+# This is a simple shell test loader example.
+# ---
+#
+# ---
+# env
+# {
+#  "needs_tmpdir": true
+# }
+# ---
+
+. tst_loader.sh
+
+tst_res TPASS "Shell loader works fine!"
+case "$PWD" in
+	/tmp/*)
+		tst_res TPASS "We are running in temp directory in $PWD";;
+	*)
+		tst_res TFAIL "We are not running in temp directory but $PWD";;
+esac

testcases/lib/tests/shell_loader_all_filesystems.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+#
+# ---
+# env
+# {
+#  "needs_root": true,
+#  "mount_device": true,
+#  "all_filesystems": true,
+#  "mntpoint": "ltp_mntpoint"
+# }
+# ---
+
+. tst_loader.sh
+
+tst_res TINFO "In shell"
+
+mntpath=$(realpath ltp_mntpoint)
+mounted=$(grep $mntpath /proc/mounts)
+
+if [ -n "$mounted" ]; then
+	device=$(echo $mounted |cut -d' ' -f 1)
+	path=$(echo $mounted |cut -d' ' -f 2)
+
+	tst_res TPASS "$device mounted at $path"
+else
+	tst_res TFAIL "Device not mounted!"
+fi

testcases/lib/tests/shell_loader_filesystems.sh

@@ -0,0 +1,33 @@
+#!/bin/sh
+#
+# ---
+# env
+# {
+#  "mount_device": true,
+#  "mntpoint": "ltp_mntpoint",
+#  "filesystems": [
+#   {
+#    "type": "btrfs"
+#   },
+#   {
+#    "type": "xfs",
+#    "mkfs_opts": ["-m", "reflink=1"]
+#   }
+#  ]
+# }
+# ---
+
+. tst_loader.sh
+
+tst_res TINFO "In shell"
+
+mntpoint=$(realpath ltp_mntpoint)
+mounted=$(grep $mntpoint /proc/mounts)
+
+if [ -n "$mounted" ]; then
+	fs=$(echo $mounted |cut -d' ' -f 3)
+
+	tst_res TPASS "Mounted device formatted with $fs"
+else
+	tst_res TFAIL "Device not mounted!"
+fi

testcases/lib/tests/shell_loader_invalid_block.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+#
+# ---
+# doc
+#
+# [Description]
+#
+# This is a simple shell test loader example.
+# ---
+#
+# ---
+# env
+# {
+#  "needs_tmpdir": true
+# }
+# ---
+#
+# ---
+# inv
+#
+# This is an invalid block that breaks the test.
+# ---
+
+. tst_loader.sh
+
+tst_res TPASS "This should pass!"

testcases/lib/tests/shell_loader_invalid_metadata.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+#
+# This test has wrong metadata and should not be run
+#
+# ---
+# env
+# {
+#  {"needs_tmpdir": 42,
+# }
+# ---
+#
+
+. tst_loader.sh
+
+tst_res TFAIL "Shell loader should TBROK the test"

testcases/lib/tests/shell_loader_kconfigs.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+#
+# ---
+# env
+# {
+#  "needs_kconfigs": ["CONFIG_NUMA=y"]
+# }
+# ---
+
+. tst_loader.sh
+
+tst_res TPASS "Shell loader works fine!"

testcases/lib/tests/shell_loader_no_metadata.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+#
+# This test has no metadata and should not be executed
+#
+
+. tst_loader.sh
+
+tst_res TFAIL "Shell loader should TBROK the test"

testcases/lib/tests/shell_loader_supported_archs.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+#
+# ---
+# env
+# {
+#  "supported_archs": ["x86", "ppc64", "x86_64"]
+# }
+# ---
+
+. tst_loader.sh
+
+tst_res TPASS "We are running on supported architecture"

testcases/lib/tests/shell_loader_tags.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+#
+# ---
+# env
+# {
+#  "tags": [
+#   ["linux-git", "832478cd342ab"],
+#   ["CVE", "2099-999"]
+#  ]
+# }
+# ---
+
+. tst_loader.sh
+
+tst_res TFAIL "Fails the test so that tags are shown."

testcases/lib/tests/shell_loader_tcnt.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+#
+# The script should be executed tcnt times and the iteration number should be in $1
+#
+# ---
+# env
+# {
+#  "tcnt": 2
+# }
+# ---
+#
+
+. tst_loader.sh
+
+tst_res TPASS "Iteration $1"

testcases/lib/tests/shell_loader_wrong_metadata.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+#
+# This test has wrong metadata and should not be run
+#
+# ---
+# env
+# {
+#  "needs_tmpdir": 42,
+# }
+# ---
+#
+
+. tst_loader.sh
+
+tst_res TFAIL "Shell loader should TBROK the test"

testcases/lib/tst_env.sh

@@ -1,4 +1,8 @@
 #!/bin/sh
+#
+# This is a minimal test environment for a shell scripts executed from C by
+# tst_run_shell() function. Shell tests must use the tst_loader.sh instead!
+#
 
 tst_script_name=$(basename $0)
 

testcases/lib/tst_loader.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+#
+# This is a loader for shell tests that use the C test library.
+#
+
+if [ -z "$LTP_IPC_PATH" ]; then
+	tst_run_shell $(basename "$0") "$@"
+	exit $?
+else
+	. tst_env.sh
+fi