test: add a xfs makefs test

Assert on exact allocation for different filesystem size.

Note: this test only reliably works in buildkit, with a specific version
of `xfsprogs`.

Fixes #10021

Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>

Author: smira

pkg/makefs/xfs_test.go

@@ -0,0 +1,113 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package makefs_test
+
+import (
+	"bytes"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/siderolabs/talos/pkg/makefs"
+)
+
+func TestXFSInfo(t *testing.T) { //nolint:tparallel
+	if hostname, _ := os.Hostname(); hostname != "buildkitsandbox" { //nolint:errcheck
+		t.Skipf("skipping test; only run on buildkitsandbox, got %s", hostname)
+	}
+
+	t.Setenv("PATH", "/usr/bin:/bin:/usr/sbin:/sbin")
+
+	for _, test := range []struct {
+		name string
+
+		size int64
+
+		expected string
+	}{
+		{
+			name: "1G",
+
+			size: 1024 * 1024 * 1024,
+
+			expected: `meta-data=image isize=512    agcount=4, agsize=65536 blks
+         =                       sectsz=512   attr=2, projid32bit=1
+         =                       crc=1        finobt=1, sparse=1, rmapbt=1
+         =                       reflink=1    bigtime=1 inobtcount=1 nrext64=1
+         =                       exchange=0  
+data     =                       bsize=4096   blocks=262144, imaxpct=25
+         =                       sunit=0      swidth=0 blks
+naming   =version 2              bsize=4096   ascii-ci=0, ftype=1, parent=0
+log      =internal log           bsize=4096   blocks=16384, version=2
+         =                       sectsz=512   sunit=0 blks, lazy-count=1
+realtime =none                   extsz=4096   blocks=0, rtextents=0
+`,
+		},
+		{
+			name: "10G",
+
+			size: 10 * 1024 * 1024 * 1024,
+
+			expected: `meta-data=image isize=512    agcount=4, agsize=655360 blks
+         =                       sectsz=512   attr=2, projid32bit=1
+         =                       crc=1        finobt=1, sparse=1, rmapbt=1
+         =                       reflink=1    bigtime=1 inobtcount=1 nrext64=1
+         =                       exchange=0  
+data     =                       bsize=4096   blocks=2621440, imaxpct=25
+         =                       sunit=0      swidth=0 blks
+naming   =version 2              bsize=4096   ascii-ci=0, ftype=1, parent=0
+log      =internal log           bsize=4096   blocks=16384, version=2
+         =                       sectsz=512   sunit=0 blks, lazy-count=1
+realtime =none                   extsz=4096   blocks=0, rtextents=0
+`,
+		},
+		{
+			name: "100G",
+
+			size: 100 * 1024 * 1024 * 1024,
+
+			expected: `meta-data=image isize=512    agcount=4, agsize=6553600 blks
+         =                       sectsz=512   attr=2, projid32bit=1
+         =                       crc=1        finobt=1, sparse=1, rmapbt=1
+         =                       reflink=1    bigtime=1 inobtcount=1 nrext64=1
+         =                       exchange=0  
+data     =                       bsize=4096   blocks=26214400, imaxpct=25
+         =                       sunit=0      swidth=0 blks
+naming   =version 2              bsize=4096   ascii-ci=0, ftype=1, parent=0
+log      =internal log           bsize=4096   blocks=16384, version=2
+         =                       sectsz=512   sunit=0 blks, lazy-count=1
+realtime =none                   extsz=4096   blocks=0, rtextents=0
+`,
+		},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			t.Parallel()
+
+			tmpDir := t.TempDir()
+
+			tempFile := filepath.Join(tmpDir, "xfs.img")
+
+			require.NoError(t, os.WriteFile(tempFile, nil, 0o644))
+			require.NoError(t, os.Truncate(tempFile, test.size))
+
+			require.NoError(t, makefs.XFS(tempFile))
+
+			var stdout bytes.Buffer
+
+			cmd := exec.Command("xfs_info", tempFile)
+			cmd.Stdout = &stdout
+			require.NoError(t, cmd.Run())
+
+			actual := strings.ReplaceAll(stdout.String(), tempFile, "image")
+
+			assert.Equal(t, test.expected, actual)
+		})
+	}
+}