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//go:build freebsd
package archive
import (
"archive/tar"
"fmt"
"math/bits"
"os"
"strings"
"syscall"
"github.com/containers/storage/pkg/system"
)
const (
paxSCHILYFflags = "SCHILY.fflags"
)
var (
flagNameToValue = map[string]uint32{
"sappnd": system.SF_APPEND,
"sappend": system.SF_APPEND,
"arch": system.SF_ARCHIVED,
"archived": system.SF_ARCHIVED,
"schg": system.SF_IMMUTABLE,
"schange": system.SF_IMMUTABLE,
"simmutable": system.SF_IMMUTABLE,
"sunlnk": system.SF_NOUNLINK,
"sunlink": system.SF_NOUNLINK,
"snapshot": system.SF_SNAPSHOT,
"uappnd": system.UF_APPEND,
"uappend": system.UF_APPEND,
"uarch": system.UF_ARCHIVE,
"uarchive": system.UF_ARCHIVE,
"hidden": system.UF_HIDDEN,
"uhidden": system.UF_HIDDEN,
"uchg": system.UF_IMMUTABLE,
"uchange": system.UF_IMMUTABLE,
"uimmutable": system.UF_IMMUTABLE,
"uunlnk": system.UF_NOUNLINK,
"uunlink": system.UF_NOUNLINK,
"offline": system.UF_OFFLINE,
"uoffline": system.UF_OFFLINE,
"opaque": system.UF_OPAQUE,
"rdonly": system.UF_READONLY,
"urdonly": system.UF_READONLY,
"readonly": system.UF_READONLY,
"ureadonly": system.UF_READONLY,
"reparse": system.UF_REPARSE,
"ureparse": system.UF_REPARSE,
"sparse": system.UF_SPARSE,
"usparse": system.UF_SPARSE,
"system": system.UF_SYSTEM,
"usystem": system.UF_SYSTEM,
}
// Only include the short names for the reverse map
flagValueToName = map[uint32]string{
system.SF_APPEND: "sappnd",
system.SF_ARCHIVED: "arch",
system.SF_IMMUTABLE: "schg",
system.SF_NOUNLINK: "sunlnk",
system.SF_SNAPSHOT: "snapshot",
system.UF_APPEND: "uappnd",
system.UF_ARCHIVE: "uarch",
system.UF_HIDDEN: "hidden",
system.UF_IMMUTABLE: "uchg",
system.UF_NOUNLINK: "uunlnk",
system.UF_OFFLINE: "offline",
system.UF_OPAQUE: "opaque",
system.UF_READONLY: "rdonly",
system.UF_REPARSE: "reparse",
system.UF_SPARSE: "sparse",
system.UF_SYSTEM: "system",
}
)
func parseFileFlags(fflags string) (uint32, uint32, error) {
var set, clear uint32 = 0, 0
for _, fflag := range strings.Split(fflags, ",") {
isClear := false
if clean, ok := strings.CutPrefix(fflag, "no"); ok {
isClear = true
fflag = clean
}
if value, ok := flagNameToValue[fflag]; ok {
if isClear {
clear |= value
} else {
set |= value
}
} else {
return 0, 0, fmt.Errorf("parsing file flags, unrecognised token: %s", fflag)
}
}
return set, clear, nil
}
func formatFileFlags(fflags uint32) (string, error) {
res := []string{}
for fflags != 0 {
// Extract lowest set bit
fflag := uint32(1) << bits.TrailingZeros32(fflags)
if name, ok := flagValueToName[fflag]; ok {
res = append(res, name)
} else {
return "", fmt.Errorf("formatting file flags, unrecognised flag: %x", fflag)
}
fflags &= ^fflag
}
return strings.Join(res, ","), nil
}
func ReadFileFlagsToTarHeader(path string, hdr *tar.Header) error {
st, err := system.Lstat(path)
if err != nil {
return err
}
fflags, err := formatFileFlags(st.Flags())
if err != nil {
return err
}
if fflags != "" {
if hdr.PAXRecords == nil {
hdr.PAXRecords = map[string]string{}
}
hdr.PAXRecords[paxSCHILYFflags] = fflags
}
return nil
}
func WriteFileFlagsFromTarHeader(path string, hdr *tar.Header) error {
if fflags, ok := hdr.PAXRecords[paxSCHILYFflags]; ok {
var set, clear uint32
set, clear, err := parseFileFlags(fflags)
if err != nil {
return err
}
// Apply the delta to the existing file flags
st, err := system.Lstat(path)
if err != nil {
return err
}
return system.Lchflags(path, (st.Flags() & ^clear)|set)
}
return nil
}
func resetImmutable(path string, fi *os.FileInfo) error {
var flags uint32
if fi != nil {
flags = (*fi).Sys().(*syscall.Stat_t).Flags
} else {
st, err := system.Lstat(path)
if err != nil {
return err
}
flags = st.Flags()
}
if flags&(system.SF_IMMUTABLE|system.UF_IMMUTABLE) != 0 {
flags &= ^(system.SF_IMMUTABLE | system.UF_IMMUTABLE)
return system.Lchflags(path, flags)
}
return nil
}
|
