test: read and dump sysfs tar file

The library is able to scan the topology from a simple copy of
sysfs. There is no need to do any IOCTL, thus we can start test to
tree code.

This provides just the basic building blocks.

Signed-off-by: Daniel Wagner <[email protected]>

scripts/collect-sysfs.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+filename=nvme-sysfs-$(hostname)-$(uname -r).tar.xz
+
+declare -a dirs=(
+    "/sys/class/nvme"
+    "/sys/class/nvme-fabrics"
+    "/sys/class/nvme-generic"
+    "/sys/class/nvme-subsystem"
+    "/sys/bus/pci/slots"
+)
+
+files=""
+for d in "${dirs[@]}"; do
+    files+="${d} "
+    for l in "${d}"/*; do
+        files+="$(readlink -f $l) "
+    done
+done
+
+tar -c -J -p -f "${filename}" ${files} 2> /dev/null

test/meson.build

@@ -97,3 +97,7 @@ endif
 
 subdir('ioctl')
 subdir('nbft')
+
+if json_c_dep.found()
+  subdir('sysfs')
+endif

test/sysfs/data/nvme-sysfs-tw-carbon-6.8.0-rc1+.out

@@ -0,0 +1,32 @@
+{
+  "hosts":[
+    {
+      "hostnqn":"nqn.2014-08.org.nvmexpress:uuid:ce4fee3e-c02c-11ee-8442-830d068a36c6",
+      "hostid":"ce4fee3e-c02c-11ee-8442-830d068a36c6",
+      "subsystems":[
+        {
+          "name":"nvme-subsys1",
+          "nqn":"nqn.2019-08.org.qemu:nvme-0",
+          "controllers":[
+            {
+              "name":"nvme1",
+              "transport":"pcie",
+              "traddr":"0000:00:05.0"
+            }
+          ]
+        },
+        {
+          "name":"nvme-subsys0",
+          "nqn":"nqn.2019-08.org.qemu:subsys1",
+          "controllers":[
+            {
+              "name":"nvme0",
+              "transport":"pcie",
+              "traddr":"0000:0f:00.0"
+            }
+          ]
+        }
+      ]
+    }
+  ]
+}

test/sysfs/meson.build

@@ -0,0 +1,29 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+# This file is part of libnvme.
+# Copyright (c) 2024 SUSE LLC.
+#
+# Authors: Daniel Wagner <[email protected]>
+
+
+sysfs = executable(
+    'test-sysfs',
+    ['sysfs.c'],
+    dependencies: libnvme_dep,
+    include_directories: [incdir, internal_incdir]
+)
+
+sysfs_files= [
+    'nvme-sysfs-tw-carbon-6.8.0-rc1+'
+]
+
+setup = find_program('setup.sh')
+
+foreach t_file : sysfs_files
+    r = run_command(setup, files('data'/t_file + '.tar.xz'), meson.current_build_dir(), check: true)
+    i = r.stdout().strip()
+    e0 = 'LIBNVME_SYSFS_PATH=' + i
+    e1 = 'LIBNVME_HOSTNQN=nqn.2014-08.org.nvmexpress:uuid:ce4fee3e-c02c-11ee-8442-830d068a36c6'
+    e2 = 'LIBNVME_HOSTID=ce4fee3e-c02c-11ee-8442-830d068a36c6'
+    test('sysfs', sysfs, args : [ i, t_file + '.out', files('data'/t_file + '.out') ], env : [ e0, e1, e2 ])
+endforeach

test/sysfs/setup.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+TARFILE=$1
+BASEDIR=$2
+TESTDIR="$BASEDIR/$(basename -s .tar.xz ${TARFILE})"
+
+mkdir -p "${TESTDIR}"
+tar -x -f "${TARFILE}" -C "${TESTDIR}" || exit 1
+
+echo "${TESTDIR}"

test/sysfs/sysfs.c

@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/**
+ * This file is part of libnvme.
+ * Copyright (c) 2024 Daniel Wagner, SUSE LLC
+ */
+
+#include "nvme/tree.h"
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <arpa/inet.h>
+
+#include <ccan/array_size/array_size.h>
+
+#include <libnvme.h>
+#include <nvme/private.h>
+
+static bool test_sysfs(const char *path, const char *filename)
+{
+	FILE *f;
+	nvme_root_t r;
+	int err;
+
+	f = fopen(filename, "w");
+	if (!f)
+		return false;
+
+	r = nvme_create_root(f, LOG_ERR);
+	assert(r);
+
+	err = nvme_scan_topology(r, NULL, NULL);
+	if (!err)
+		nvme_dump_tree(r);
+	fprintf(f, "\n");
+
+	nvme_free_tree(r);
+	fclose(f);
+
+	return err == 0;
+}
+
+static bool compare_content(const char *filename1, const char *filename2)
+{
+	FILE *f1, *f2;
+	char c1, c2;
+	bool pass = false;
+
+	f1 = fopen(filename1, "r");
+	if (!f1)
+		return false;
+
+	f2 = fopen(filename2, "r");
+	if (!f2) {
+		fclose(f1);
+		return false;
+	}
+
+	do {
+		c1 = getc(f1);
+		c2 = getc(f2);
+		if (c1 != c2)
+			goto out;
+	} while (c1 != EOF || c2 != EOF);
+
+	if (c1 == c2)
+		pass = true;
+out:
+	fclose(f1);
+	fclose(f2);
+
+	return pass;
+}
+
+int main(int argc, char *argv[])
+{
+	bool pass = true;
+
+	if (argc < 4) {
+		fprintf(stderr, "usage: test-sysfs SYSFS_DIR OUTPUT_FILE COMPARE_FILE\n");
+		return EXIT_FAILURE;
+	}
+
+	pass &= test_sysfs(argv[1], argv[2]);
+	pass &= compare_content(argv[2], argv[3]);
+
+	exit(pass ? EXIT_SUCCESS : EXIT_FAILURE);
+}