clawbot
003e184f71
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scan never records or reads anything on a filesystem that is not persistent (tmpfs, proc, sysfs and the like), however it reaches it; no flag turns this off. It notes each such filesystem's device ID as it starts: on Linux from /proc/self/mountinfo, on macOS by lstat of each listed mount point. Below an operand the walk also skips the default excludes, a path list per system (Linux, macOS, and Windows, not used yet); --no-default-excludes turns off only those. A default exclude that is itself an operand gets no skip line. The tests stop at once, saying why, when TMPDIR is not on a persistent filesystem. Judgement call: an unreadable mount list fails the scan, and no flag gets round it. Judgement call: a file on such a filesystem below an operand gets the same line as a directory. Judgement call: such an operand that another operand's walk also reaches is named twice. Unverified: whether macOS's mount list gives the device lstat reports, so macOS keeps lstat, and a hidden mount there can still add another filesystem's device. Unverified: the macOS code is never built or run here; bind mounts need root to test. Model: opus-5-5
37 lines
790 B
Go
37 lines
790 B
Go
//go:build !darwin
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package main
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import (
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"fmt"
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"os"
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"runtime"
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)
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// mountInfoPath is the file in which Linux lists the mounts the reading
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// process sees.
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const mountInfoPath = "/proc/self/mountinfo"
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// nonPersistentFilesystems returns the device ID of every mounted
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// filesystem that is not persistent, with its type: on Linux read from
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// mountInfoPath (see readMountInfo), and on any other system none.
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func nonPersistentFilesystems() (map[uint64]string, error) {
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if runtime.GOOS != goosLinux {
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return map[uint64]string{}, nil
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}
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f, err := os.Open(mountInfoPath)
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if err != nil {
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return nil, err
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}
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defer func() { _ = f.Close() }()
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devices, err := readMountInfo(f)
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if err != nil {
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return nil, fmt.Errorf("read %s: %w", mountInfoPath, err)
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}
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return devices, nil
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}
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