forked from toolshed/abra
47 lines
1.3 KiB
Go
47 lines
1.3 KiB
Go
//go:build !windows
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package tarheader
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import (
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"archive/tar"
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"os"
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"runtime"
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"syscall"
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"golang.org/x/sys/unix"
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)
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// sysStat populates hdr from system-dependent fields of fi without performing
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// any OS lookups.
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func sysStat(fi os.FileInfo, hdr *tar.Header) error {
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// Devmajor and Devminor are only needed for special devices.
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// In FreeBSD, RDev for regular files is -1 (unless overridden by FS):
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// https://cgit.freebsd.org/src/tree/sys/kern/vfs_default.c?h=stable/13#n1531
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// (NODEV is -1: https://cgit.freebsd.org/src/tree/sys/sys/param.h?h=stable/13#n241).
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// ZFS in particular does not override the default:
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// https://cgit.freebsd.org/src/tree/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vnops_os.c?h=stable/13#n2027
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// Since `Stat_t.Rdev` is uint64, the cast turns -1 into (2^64 - 1).
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// Such large values cannot be encoded in a tar header.
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if runtime.GOOS == "freebsd" && hdr.Typeflag != tar.TypeBlock && hdr.Typeflag != tar.TypeChar {
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return nil
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}
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s, ok := fi.Sys().(*syscall.Stat_t)
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if !ok {
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return nil
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}
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hdr.Uid = int(s.Uid)
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hdr.Gid = int(s.Gid)
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if s.Mode&unix.S_IFBLK != 0 ||
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s.Mode&unix.S_IFCHR != 0 {
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hdr.Devmajor = int64(unix.Major(uint64(s.Rdev))) //nolint: unconvert
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hdr.Devminor = int64(unix.Minor(uint64(s.Rdev))) //nolint: unconvert
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}
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return nil
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}
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