jcoffey-dev
77e80cb9f2
119 SPDX-FileCopyrightText headers and the README's licence line. The distinction that matters here: LINUXexpert-org appears in this repository in two completely different roles. As a copyright holder in the SPDX headers, which is what changes, and as the GitHub organisation in the module path and 64 import statements, which does not -- the repository still lives at github.com/LINUXexpert-org/stalwart-migrator, and rewriting that would not be a licence change, it would break the build. Both replacements are anchored to their copyright forms, so an import path cannot match either. Import count is 64 before and after, and go.mod is untouched. LICENSE untouched: the FSF's copyright on the GPL text and the "<name of author>" placeholders are not ours to edit. go vet, go build and go test all clean.
59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
// SPDX-FileCopyrightText: 2026 Coffey Labs
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// SPDX-License-Identifier: GPL-3.0-or-later
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package preflight
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import (
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"fmt"
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"io/fs"
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"path/filepath"
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"syscall"
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)
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// DirSize walks dir and sums the size of every regular file in it. Used to
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// estimate how much free space a filesystem-level backup copy will need -
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// see ARCHITECTURE.md §4.2.
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func DirSize(dir string) (int64, error) {
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var total int64
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err := filepath.WalkDir(dir, func(_ string, d fs.DirEntry, err error) error {
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if err != nil {
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return err
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}
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if d.Type().IsRegular() {
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info, err := d.Info()
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if err != nil {
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return err
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}
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total += info.Size()
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}
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return nil
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})
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if err != nil {
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return 0, fmt.Errorf("preflight: measure size of %s: %w", dir, err)
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}
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return total, nil
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}
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// FreeBytes returns the free space available (to an unprivileged process)
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// on the filesystem containing path.
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func FreeBytes(path string) (uint64, error) {
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var stat syscall.Statfs_t
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if err := syscall.Statfs(path, &stat); err != nil {
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return 0, fmt.Errorf("preflight: statfs %s: %w", path, err)
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}
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return stat.Bavail * uint64(stat.Bsize), nil
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}
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func humanBytes(n uint64) string {
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const unit = 1024
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if n < unit {
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return fmt.Sprintf("%d B", n)
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}
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div, exp := uint64(unit), 0
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for n/div >= unit {
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div *= unit
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exp++
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}
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return fmt.Sprintf("%.1f %ciB", float64(n)/float64(div), "KMGTPE"[exp])
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}
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