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36 lines
1.0 KiB
Go
36 lines
1.0 KiB
Go
//go:build linux
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package utils
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import (
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"fmt"
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"syscall"
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)
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// Filesystem magic values from Linux's include/uapi/linux/magic.h, used by statfs(2).
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const (
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nfsSuperMagic = 0x6969
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smbSuperMagic = 0x517b
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cifsSuperMagic = 0xff534d42
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fuseSuperMagic = 0x65735546
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)
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// IsNetworkedFileSystem reports whether path is on a filesystem that is known to be unsafe for SQLite, specifically NFS, SMB/CIFS, or FUSE mounts.
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func IsNetworkedFileSystem(path string) (bool, error) {
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var statfs syscall.Statfs_t
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err := syscall.Statfs(path, &statfs)
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if err != nil {
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return false, fmt.Errorf("error executing statfs syscall: %w", err)
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}
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// Statfs_t.Type is arch-dependent (for example, int32 on some systems and int64 on others).
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// Normalize through uint32 first so signed values still preserve the Linux bit pattern for magic numbers such as CIFS (0xff534d42), then compare in a wide unsigned form.
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//nolint:gosec
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switch uint64(uint32(statfs.Type)) {
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case nfsSuperMagic, smbSuperMagic, cifsSuperMagic, fuseSuperMagic:
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return true, nil
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default:
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return false, nil
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}
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}
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