kunit: kunit_parser: make parser more robust

Previously, kunit_parser did not properly handle kunit TAP output that
- had any prefixes (generated from different configs e.g.
CONFIG_PRINTK_TIME)
- had unrelated kernel output mixed in the middle of
it, which has shown up when testing with allyesconfig
To remove prefixes, the parser looks for the first line that includes
TAP output, "TAP version 14".  It then determines the length of the
string before this sequence, and strips that number of characters off
the beginning of the following lines until the last KUnit output line is
reached.
These fixes have been tested with additional tests in the
KUnitParseTest and their associated logs have also been added.

Signed-off-by: Heidi Fahim <heidifahim@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

7 files changed, 190 insertions, 0 deletions

diff --git a/tools/testing/kunit/test_data/test_config_printk_time.log b/tools/testing/kunit/test_data/test_config_printk_time.log
new file mode 100644
index 000000000000..c02ca773946d
--- /dev/null
+++ b/tools/testing/kunit/test_data/test_config_printk_time.log
@@ -0,0 +1,31 @@
+[    0.060000] printk: console [mc-1] enabled
+[    0.060000] random: get_random_bytes called from init_oops_id+0x35/0x40 with crng_init=0
+[    0.060000] TAP version 14
+[    0.060000] 	# Subtest: kunit-resource-test
+[    0.060000] 	1..5
+[    0.060000] 	ok 1 - kunit_resource_test_init_resources
+[    0.060000] 	ok 2 - kunit_resource_test_alloc_resource
+[    0.060000] 	ok 3 - kunit_resource_test_destroy_resource
+[    0.060000] 	ok 4 - kunit_resource_test_cleanup_resources
+[    0.060000] 	ok 5 - kunit_resource_test_proper_free_ordering
+[    0.060000] ok 1 - kunit-resource-test
+[    0.060000] 	# Subtest: kunit-try-catch-test
+[    0.060000] 	1..2
+[    0.060000] 	ok 1 - kunit_test_try_catch_successful_try_no_catch
+[    0.060000] 	ok 2 - kunit_test_try_catch_unsuccessful_try_does_catch
+[    0.060000] ok 2 - kunit-try-catch-test
+[    0.060000] 	# Subtest: string-stream-test
+[    0.060000] 	1..3
+[    0.060000] 	ok 1 - string_stream_test_empty_on_creation
+[    0.060000] 	ok 2 - string_stream_test_not_empty_after_add
+[    0.060000] 	ok 3 - string_stream_test_get_string
+[    0.060000] ok 3 - string-stream-test
+[    0.060000] List of all partitions:
+[    0.060000] No filesystem could mount root, tried:
+[    0.060000]
+[    0.060000] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(98,0)
+[    0.060000] CPU: 0 PID: 1 Comm: swapper Not tainted 5.4.0-rc1-gea2dd7c0875e-dirty #2
+[    0.060000] Stack:
+[    0.060000]  602086f8 601bc260 705c0000 705c0000
+[    0.060000]  602086f8 6005fcec 705c0000 6002c6ab
+[    0.060000]  6005fcec 601bc260 705c0000 3000000010
\ No newline at end of file
diff --git a/tools/testing/kunit/test_data/test_interrupted_tap_output.log b/tools/testing/kunit/test_data/test_interrupted_tap_output.log
new file mode 100644
index 000000000000..5c73fb3a1c6f
--- /dev/null
+++ b/tools/testing/kunit/test_data/test_interrupted_tap_output.log
@@ -0,0 +1,37 @@
+[    0.060000] printk: console [mc-1] enabled
+[    0.060000] random: get_random_bytes called from init_oops_id+0x35/0x40 with crng_init=0
+[    0.060000] TAP version 14
+[    0.060000] 	# Subtest: kunit-resource-test
+[    0.060000] 	1..5
+[    0.060000] 	ok 1 - kunit_resource_test_init_resources
+[    0.060000] 	ok 2 - kunit_resource_test_alloc_resource
+[    0.060000] 	ok 3 - kunit_resource_test_destroy_resource
+[    0.060000] kAFS: Red Hat AFS client v0.1 registering.
+[    0.060000] FS-Cache: Netfs 'afs' registered for caching
+[    0.060000] *** VALIDATE kAFS ***
+[    0.060000] Btrfs loaded, crc32c=crc32c-generic, debug=on, assert=on, integrity-checker=on, ref-verify=on
+[    0.060000] BTRFS: selftest: sectorsize: 4096  nodesize: 4096
+[    0.060000] BTRFS: selftest: running btrfs free space cache tests
+[    0.060000] 	ok 4 - kunit_resource_test_cleanup_resources
+[    0.060000] 	ok 5 - kunit_resource_test_proper_free_ordering
+[    0.060000] ok 1 - kunit-resource-test
+[    0.060000] 	# Subtest: kunit-try-catch-test
+[    0.060000] 	1..2
+[    0.060000] 	ok 1 - kunit_test_try_catch_successful_try_no_catch
+[    0.060000] 	ok 2 - kunit_test_try_catch_unsuccessful_try_does_catch
+[    0.060000] ok 2 - kunit-try-catch-test
+[    0.060000] 	# Subtest: string-stream-test
+[    0.060000] 	1..3
+[    0.060000] 	ok 1 - string_stream_test_empty_on_creation
+[    0.060000] 	ok 2 - string_stream_test_not_empty_after_add
+[    0.060000] 	ok 3 - string_stream_test_get_string
+[    0.060000] ok 3 - string-stream-test
+[    0.060000] List of all partitions:
+[    0.060000] No filesystem could mount root, tried:
+[    0.060000]
+[    0.060000] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(98,0)
+[    0.060000] CPU: 0 PID: 1 Comm: swapper Not tainted 5.4.0-rc1-gea2dd7c0875e-dirty #2
+[    0.060000] Stack:
+[    0.060000]  602086f8 601bc260 705c0000 705c0000
+[    0.060000]  602086f8 6005fcec 705c0000 6002c6ab
+[    0.060000]  6005fcec 601bc260 705c0000 3000000010
\ No newline at end of file
diff --git a/tools/testing/kunit/test_data/test_kernel_panic_interrupt.log b/tools/testing/kunit/test_data/test_kernel_panic_interrupt.log
new file mode 100644
index 000000000000..c045eee75f27
--- /dev/null
+++ b/tools/testing/kunit/test_data/test_kernel_panic_interrupt.log
@@ -0,0 +1,25 @@
+[    0.060000] printk: console [mc-1] enabled
+[    0.060000] random: get_random_bytes called from init_oops_id+0x35/0x40 with crng_init=0
+[    0.060000] TAP version 14
+[    0.060000] 	# Subtest: kunit-resource-test
+[    0.060000] 	1..5
+[    0.060000] 	ok 1 - kunit_resource_test_init_resources
+[    0.060000] 	ok 2 - kunit_resource_test_alloc_resource
+[    0.060000] 	ok 3 - kunit_resource_test_destroy_resource
+[    0.060000] 	ok 4 - kunit_resource_test_cleanup_resources
+[    0.060000] 	ok 5 - kunit_resource_test_proper_free_ordering
+[    0.060000] ok 1 - kunit-resource-test
+[    0.060000] 	# Subtest: kunit-try-catch-test
+[    0.060000] 	1..2
+[    0.060000] 	ok 1 - kunit_test_try_catch_successful_try_no_catch
+[    0.060000] 	ok 2 - kunit_test_try_catch_unsuccessful_try_does_catch
+[    0.060000] ok 2 - kunit-try-catch-test
+[    0.060000] 	# Subtest: string-stream-test
+[    0.060000] 	1..3
+[    0.060000] 	ok 1 - string_stream_test_empty_on_creation
+[    0.060000] 	Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(98,0)
+[    0.060000] CPU: 0 PID: 1 Comm: swapper Not tainted 5.4.0-rc1-gea2dd7c0875e-dirty #2
+[    0.060000] Stack:
+[    0.060000]  602086f8 601bc260 705c0000 705c0000
+[    0.060000]  602086f8 6005fcec 705c0000 6002c6ab
+[    0.060000]  6005fcec 601bc260 705c0000 3000000010
\ No newline at end of file
diff --git a/tools/testing/kunit/test_data/test_multiple_prefixes.log b/tools/testing/kunit/test_data/test_multiple_prefixes.log
new file mode 100644
index 000000000000..bc48407dcc36
--- /dev/null
+++ b/tools/testing/kunit/test_data/test_multiple_prefixes.log
@@ -0,0 +1,31 @@
+[    0.060000][    T1] printk: console [mc-1] enabled
+[    0.060000][    T1] random: get_random_bytes called from init_oops_id+0x35/0x40 with crng_init=0
+[    0.060000][    T1] TAP version 14
+[    0.060000][    T1] 	# Subtest: kunit-resource-test
+[    0.060000][    T1] 	1..5
+[    0.060000][    T1] 	ok 1 - kunit_resource_test_init_resources
+[    0.060000][    T1] 	ok 2 - kunit_resource_test_alloc_resource
+[    0.060000][    T1] 	ok 3 - kunit_resource_test_destroy_resource
+[    0.060000][    T1] 	ok 4 - kunit_resource_test_cleanup_resources
+[    0.060000][    T1] 	ok 5 - kunit_resource_test_proper_free_ordering
+[    0.060000][    T1] ok 1 - kunit-resource-test
+[    0.060000][    T1] 	# Subtest: kunit-try-catch-test
+[    0.060000][    T1] 	1..2
+[    0.060000][    T1] 	ok 1 - kunit_test_try_catch_successful_try_no_catch
+[    0.060000][    T1] 	ok 2 - kunit_test_try_catch_unsuccessful_try_does_catch
+[    0.060000][    T1] ok 2 - kunit-try-catch-test
+[    0.060000][    T1] 	# Subtest: string-stream-test
+[    0.060000][    T1] 	1..3
+[    0.060000][    T1] 	ok 1 - string_stream_test_empty_on_creation
+[    0.060000][    T1] 	ok 2 - string_stream_test_not_empty_after_add
+[    0.060000][    T1] 	ok 3 - string_stream_test_get_string
+[    0.060000][    T1] ok 3 - string-stream-test
+[    0.060000][    T1] List of all partitions:
+[    0.060000][    T1] No filesystem could mount root, tried:
+[    0.060000][    T1]
+[    0.060000][    T1] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(98,0)
+[    0.060000][    T1] CPU: 0 PID: 1 Comm: swapper Not tainted 5.4.0-rc1-gea2dd7c0875e-dirty #2
+[    0.060000][    T1] Stack:
+[    0.060000][    T1]  602086f8 601bc260 705c0000 705c0000
+[    0.060000][    T1]  602086f8 6005fcec 705c0000 6002c6ab
+[    0.060000][    T1]  6005fcec 601bc260 705c0000 3000000010
\ No newline at end of file
diff --git a/tools/testing/kunit/test_data/test_output_with_prefix_isolated_correctly.log b/tools/testing/kunit/test_data/test_output_with_prefix_isolated_correctly.log
new file mode 100644
index 000000000000..0f87cdabebb0
--- /dev/null
+++ b/tools/testing/kunit/test_data/test_output_with_prefix_isolated_correctly.log
@@ -0,0 +1,33 @@
+[    0.060000] printk: console [mc-1] enabled
+[    0.060000] random: get_random_bytes called from init_oops_id+0x35/0x40 with crng_init=0
+[    0.060000] TAP version 14
+[    0.060000] 	# Subtest: kunit-resource-test
+[    0.060000] 	1..5
+[    0.060000] 	ok 1 - kunit_resource_test_init_resources
+[    0.060000] 	ok 2 - kunit_resource_test_alloc_resource
+[    0.060000] 	ok 3 - kunit_resource_test_destroy_resource
+[    0.060000]  foo bar 	#
+[    0.060000] 	ok 4 - kunit_resource_test_cleanup_resources
+[    0.060000] 	ok 5 - kunit_resource_test_proper_free_ordering
+[    0.060000] ok 1 - kunit-resource-test
+[    0.060000]  foo bar 	# non-kunit output
+[    0.060000] 	# Subtest: kunit-try-catch-test
+[    0.060000] 	1..2
+[    0.060000] 	ok 1 - kunit_test_try_catch_successful_try_no_catch
+[    0.060000] 	ok 2 - kunit_test_try_catch_unsuccessful_try_does_catch
+[    0.060000] ok 2 - kunit-try-catch-test
+[    0.060000] 	# Subtest: string-stream-test
+[    0.060000] 	1..3
+[    0.060000] 	ok 1 - string_stream_test_empty_on_creation
+[    0.060000] 	ok 2 - string_stream_test_not_empty_after_add
+[    0.060000] 	ok 3 - string_stream_test_get_string
+[    0.060000] ok 3 - string-stream-test
+[    0.060000] List of all partitions:
+[    0.060000] No filesystem could mount root, tried:
+[    0.060000]
+[    0.060000] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(98,0)
+[    0.060000] CPU: 0 PID: 1 Comm: swapper Not tainted 5.4.0-rc1-gea2dd7c0875e-dirty #2
+[    0.060000] Stack:
+[    0.060000]  602086f8 601bc260 705c0000 705c0000
+[    0.060000]  602086f8 6005fcec 705c0000 6002c6ab
+[    0.060000]  6005fcec 601bc260 705c0000 3000000010
\ No newline at end of file
diff --git a/tools/testing/kunit/test_data/test_pound_no_prefix.log b/tools/testing/kunit/test_data/test_pound_no_prefix.log
new file mode 100644
index 000000000000..2ceb360be7d5
--- /dev/null
+++ b/tools/testing/kunit/test_data/test_pound_no_prefix.log
@@ -0,0 +1,33 @@
+ printk: console [mc-1] enabled
+ random: get_random_bytes called from init_oops_id+0x35/0x40 with crng_init=0
+ TAP version 14
+ 	# Subtest: kunit-resource-test
+ 	1..5
+ 	ok 1 - kunit_resource_test_init_resources
+ 	ok 2 - kunit_resource_test_alloc_resource
+ 	ok 3 - kunit_resource_test_destroy_resource
+  foo bar 	#
+ 	ok 4 - kunit_resource_test_cleanup_resources
+ 	ok 5 - kunit_resource_test_proper_free_ordering
+ ok 1 - kunit-resource-test
+  foo bar 	# non-kunit output
+ 	# Subtest: kunit-try-catch-test
+ 	1..2
+ 	ok 1 - kunit_test_try_catch_successful_try_no_catch
+ 	ok 2 - kunit_test_try_catch_unsuccessful_try_does_catch
+ ok 2 - kunit-try-catch-test
+ 	# Subtest: string-stream-test
+ 	1..3
+ 	ok 1 - string_stream_test_empty_on_creation
+ 	ok 2 - string_stream_test_not_empty_after_add
+ 	ok 3 - string_stream_test_get_string
+ ok 3 - string-stream-test
+ List of all partitions:
+ No filesystem could mount root, tried:
+
+ Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(98,0)
+ CPU: 0 PID: 1 Comm: swapper Not tainted 5.4.0-rc1-gea2dd7c0875e-dirty #2
+ Stack:
+  602086f8 601bc260 705c0000 705c0000
+  602086f8 6005fcec 705c0000 6002c6ab
+  6005fcec 601bc260 705c0000 3000000010
\ No newline at end of file
diff --git a/tools/testing/kunit/test_data/test_pound_sign.log b/tools/testing/kunit/test_data/test_pound_sign.log
new file mode 100644
index 000000000000..e69de29bb2d1
--- /dev/null
+++ b/tools/testing/kunit/test_data/test_pound_sign.log