[LTP] [PATCH v2 3/3] lib: Add support for debugging .all_filesystems

[Petr Vorel]

with LTP_SINGLE_FS_TYPE environment variable tests only that
filesystem instead of all supported filesystems.

Signed-off-by: Petr Vorel <pvorel@suse.cz>
---
Changes v1->v2:
* rename variable to LTP_SINGLE_FS_TYPE
* print help in -h

 doc/user-guide.txt           | 2 ++
 lib/tst_supported_fs_types.c | 9 +++++++++
 lib/tst_test.c               | 1 +
 3 files changed, 12 insertions(+)

diff --git a/doc/user-guide.txt b/doc/user-guide.txt
index 6a9fb33005..244392a6a3 100644
--- a/doc/user-guide.txt
+++ b/doc/user-guide.txt
@@ -15,6 +15,8 @@ For running LTP network tests see `testcases/network/README.md`.
                           'n' or '0': never colorize.
 | 'LTP_DEV'             | Path to the block device to be used
                           (C: '.needs_device = 1', shell: 'TST_NEEDS_DEVICE=1').
+| 'LTP_SINGLE_FS_TYPE'  | Testing only specified filesystem instead all
+                          supported (for tests with '.all_filesystems').
 | 'LTP_DEV_FS_TYPE'     | Filesystem used for testing (default: 'ext2').
 | 'LTP_TIMEOUT_MUL'     | Multiply timeout, must be number >= 1 (> 1 is useful for
                           slow machines to avoid unexpected timeout).
diff --git a/lib/tst_supported_fs_types.c b/lib/tst_supported_fs_types.c
index fc072cadfd..23e5ce8775 100644
--- a/lib/tst_supported_fs_types.c
+++ b/lib/tst_supported_fs_types.c
@@ -139,8 +139,17 @@ const char **tst_get_supported_fs_types(const char *const *skiplist)
 	unsigned int i, j = 0;
 	int skip_fuse;
 	enum tst_fs_impl sup;
+	const char *only_fs;
 
 	skip_fuse = tst_fs_in_skiplist("fuse", skiplist);
+	only_fs = getenv("LTP_SINGLE_FS_TYPE");
+
+	if (only_fs) {
+		tst_res(TINFO, "WARNING: testing only %s", only_fs);
+		if (tst_fs_is_supported(only_fs))
+			fs_types[0] = only_fs;
+		return fs_types;
+	}
 
 	for (i = 0; fs_type_whitelist[i]; i++) {
 		if (tst_fs_in_skiplist(fs_type_whitelist[i], skiplist)) {
diff --git a/lib/tst_test.c b/lib/tst_test.c
index f92ff858e9..ce2b8239d7 100644
--- a/lib/tst_test.c
+++ b/lib/tst_test.c
@@ -483,6 +483,7 @@ static void print_help(void)
 	fprintf(stderr, "LTP_COLORIZE_OUTPUT  Force colorized output behaviour (y/1 always, n/0: never)\n");
 	fprintf(stderr, "LTP_DEV              Path to the block device to be used (for .needs_device)\n");
 	fprintf(stderr, "LTP_DEV_FS_TYPE      Filesystem used for testing (default: %s)\n", DEFAULT_FS_TYPE);
+	fprintf(stderr, "LTP_SINGLE_FS_TYPE   Testing only specified filesystem instead all supported (for .all_filesystems)\n");
 	fprintf(stderr, "LTP_TIMEOUT_MUL      Multiply timeout (must be number >= 1)\n");
 	fprintf(stderr, "LTP_VIRT_OVERRIDE    Overrides virtual machine detection (values: \"\"|kvm|microsoft|xen|zvm\n");
 	fprintf(stderr, "TMPDIR               Base directory for template directory (for .needs_tmpdir, default: %s)\n", TEMPDIR);
-- 
2.34.1