[LTP] [PATCH v3 2/3] doc: Complete struct tst_test table and shell API docs

[Andrea Cervesato <andrea.cervesato@suse.de>]

From: Andrea Cervesato <andrea.cervesato@suse.com>

Add 8 missing struct tst_test fields to the C/Shell API comparison
table in writing_tests.rst: .filesystems, .forks_child, .min_runtime,
.needs_abi_bits, .needs_cgroup_nsdelegate, .needs_cgroup_ver,
.needs_hugetlbfs and .runs_script, and fix the alphabetical ordering
of .mnt_flags and .min_swap_avail.

Add a shell API variables reference section to api_shell_tests.rst
documenting all public TST_* input/output variables, checkpoint
functions, and retry helpers.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 doc/developers/api_shell_tests.rst | 163 +++++++++++++++++++++++++++++++++++++
 doc/developers/writing_tests.rst   |  28 ++++++-
 2 files changed, 189 insertions(+), 2 deletions(-)

diff --git a/doc/developers/api_shell_tests.rst b/doc/developers/api_shell_tests.rst
index 937ffee2ea468552e5160775153990f13ea10f88..168e6c122730b4e9ace07a1f9d8554f8d8f9a290 100644
--- a/doc/developers/api_shell_tests.rst
+++ b/doc/developers/api_shell_tests.rst
@@ -93,3 +93,166 @@ interrupted by :ref:`tst_brk`.
 
    .. literalinclude:: ../../testcases/lib/tests/shell_loader_setup_cleanup.sh
       :language: shell
+
+Shell API variables
+-------------------
+
+The following variables are available to shell tests. Variables marked
+*input* are set by the test before sourcing ``tst_run.sh``; variables
+marked *output* are set by the library for tests to read.
+
+Test definition (input)
+~~~~~~~~~~~~~~~~~~~~~~~
+
+``TST_TESTFUNC``
+    Name of the test function (required).
+
+``TST_CNT``
+    Number of test cases. When set the test function is called
+    ``TST_CNT`` times with a counter argument.
+
+``TST_SETUP``
+    Name of the setup function (called once before tests).
+
+``TST_CLEANUP``
+    Name of the cleanup function (called once after tests or on
+    ``tst_brk``).
+
+``TST_OPTS``
+    Extra getopts option string.
+
+``TST_PARSE_ARGS``
+    Name of a function to parse extra options from ``TST_OPTS``.
+
+``TST_USAGE``
+    Name of a function printing extra usage information.
+
+``TST_POS_ARGS``
+    Number of expected positional arguments.
+
+``TST_TEST_DATA``
+    Space-separated data passed as a second argument to the test
+    function.
+
+``TST_TEST_DATA_IFS``
+    Custom delimiter for ``TST_TEST_DATA`` (default: space).
+
+Requirements (input)
+~~~~~~~~~~~~~~~~~~~~
+
+``TST_NEEDS_ROOT``
+    Set to 1 to require root privileges.
+
+``TST_NEEDS_TMPDIR``
+    Set to 1 to create a temporary directory.
+
+``TST_NEEDS_DEVICE``
+    Set to 1 to prepare a block device.
+
+``TST_NEEDS_CMDS``
+    Space-separated list of required commands.
+
+``TST_NEEDS_MODULE``
+    Kernel module name that must be loadable.
+
+``TST_NEEDS_DRIVERS``
+    Space-separated list of required kernel drivers.
+
+``TST_NEEDS_KCONFIGS``
+    Space-separated list of required kernel config options
+    (e.g. ``CONFIG_NUMA=y``).
+
+``TST_NEEDS_KCONFIGS_IFS``
+    Custom delimiter for ``TST_NEEDS_KCONFIGS`` (default: comma).
+
+``TST_NEEDS_CHECKPOINTS``
+    Set to 1 to enable checkpoint support.
+
+``TST_MIN_KVER``
+    Minimum kernel version string (e.g. ``4.18``).
+
+Device and filesystem (input)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+``TST_FORMAT_DEVICE``
+    Set to 1 to format ``TST_DEVICE`` before the test.
+
+``TST_MOUNT_DEVICE``
+    Set to 1 to mount ``TST_DEVICE`` at ``TST_MNTPOINT``.
+
+``TST_DEV_EXTRA_OPTS``
+    Extra options passed to ``mkfs``.
+
+``TST_DEV_FS_OPTS``
+    Extra filesystem-specific ``mkfs`` options.
+
+``TST_FS_TYPE``
+    Filesystem type for formatting (default: ``ext2``).
+
+``TST_DEVICE_SIZE``
+    Device size in MB.
+
+``TST_ALL_FILESYSTEMS``
+    Set to 1 to repeat the test for each supported filesystem.
+
+``TST_SKIP_FILESYSTEMS``
+    Space-separated list of filesystems to skip.
+
+``TST_MNT_PARAMS``
+    Mount flags/options string.
+
+Miscellaneous (input)
+~~~~~~~~~~~~~~~~~~~~~
+
+``TST_SKIP_IN_LOCKDOWN``
+    Set to 1 to skip when kernel lockdown is active.
+
+``TST_SKIP_IN_SECUREBOOT``
+    Set to 1 to skip when Secure Boot is enabled.
+
+``TST_TIMEOUT``
+    Test timeout in seconds.
+
+Output variables
+~~~~~~~~~~~~~~~~
+
+``TST_TMPDIR``
+    Path to the temporary directory (when ``TST_NEEDS_TMPDIR=1``).
+
+``TST_STARTWD``
+    Original working directory before ``chdir`` to ``TST_TMPDIR``.
+
+``TST_DEVICE``
+    Block device path (when ``TST_NEEDS_DEVICE=1``).
+
+``TST_MNTPOINT``
+    Mount point path.
+
+``TST_MODPATH``
+    Path to the loaded kernel module.
+
+Checkpoint functions
+~~~~~~~~~~~~~~~~~~~~
+
+``TST_CHECKPOINT_WAIT``
+    Wait on checkpoint (argument: checkpoint id).
+
+``TST_CHECKPOINT_WAKE``
+    Wake one waiter on checkpoint (argument: checkpoint id).
+
+``TST_CHECKPOINT_WAKE2``
+    Wake multiple waiters (arguments: checkpoint id, count).
+
+``TST_CHECKPOINT_WAKE_AND_WAIT``
+    Wake one waiter and then wait (argument: checkpoint id).
+
+Retry helpers
+~~~~~~~~~~~~~
+
+``TST_RETRY_FUNC``
+    Retry a function until it succeeds or times out
+    (arguments: function, expected value).
+
+``TST_RETRY_FN_EXP_BACKOFF``
+    Like ``TST_RETRY_FUNC`` with exponential backoff
+    (arguments: function, expected value, max delay).
diff --git a/doc/developers/writing_tests.rst b/doc/developers/writing_tests.rst
index dc40324b16d40c4d210fe0dfa6b311b5b3337c7a..4db57898fcf08b83e68be996f666e91c418838fc 100644
--- a/doc/developers/writing_tests.rst
+++ b/doc/developers/writing_tests.rst
@@ -382,6 +382,12 @@ LTP C And Shell Test API Comparison
     * - .dev_min_size
       - TST_DEVICE_SIZE
 
+    * - .filesystems
+      - \-
+
+    * - .forks_child
+      - not applicable
+
     * - .format_device
       - TST_FORMAT_DEVICE
 
@@ -399,21 +405,33 @@ LTP C And Shell Test API Comparison
     * - .min_mem_avail
       - not applicable
 
-    * - .mnt_flags
-      - TST_MNT_PARAMS
+    * - .min_runtime
+      - \-
 
     * - .min_swap_avail
       - not applicable
 
+    * - .mnt_flags
+      - TST_MNT_PARAMS
+
     * - .mntpoint | .mnt_data
       - TST_MNTPOINT
 
     * - .mount_device
       - TST_MOUNT_DEVICE
 
+    * - .needs_abi_bits
+      - not applicable
+
     * - .needs_cgroup_ctrls
       - \-
 
+    * - .needs_cgroup_nsdelegate
+      - \-
+
+    * - .needs_cgroup_ver
+      - \-
+
     * - .needs_checkpoints
       - TST_NEEDS_CHECKPOINTS
 
@@ -426,6 +444,9 @@ LTP C And Shell Test API Comparison
     * - .needs_device
       - TST_NEEDS_DEVICE
 
+    * - .needs_hugetlbfs
+      - \-
+
     * - removed
       - TST_NEEDS_DRIVERS
 
@@ -453,6 +474,9 @@ LTP C And Shell Test API Comparison
     * - .restore_wallclock
       - not applicable
 
+    * - .runs_script
+      - not applicable
+
     * - .sample
       - \-
 

-- 
2.51.0


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