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Use Fchmodat from x/sys/unix #100

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Use Fchmodat from x/sys/unix #100

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14 changes: 13 additions & 1 deletion driver/driver_unix.go
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Original file line number Diff line number Diff line change
Expand Up @@ -7,10 +7,12 @@ import (
"fmt"
"os"
"path/filepath"
"runtime"
"sort"

"github.com/containerd/continuity/devices"
"github.com/containerd/continuity/sysx"
"golang.org/x/sys/unix"
)

func (d *driver) Mknod(path string, mode os.FileMode, major, minor int) error {
Expand All @@ -35,7 +37,17 @@ func (d *driver) Lchmod(path string, mode os.FileMode) (err error) {
}
}

return sysx.Fchmodat(0, path, uint32(mode), sysx.AtSymlinkNofollow)
flags := unix.AT_SYMLINK_NOFOLLOW
if runtime.GOOS == "linux" {
// Chmod on symlinks is not supported on Linux, i.e. unix.Fchmodat
// returns EOPNOTSUPP if AT_SYMLINK_NOFOLLOW is specified even
// if the path isn't a symlink (also see
// https://github.com/golang/go/issues/20130).
if mode&os.ModeSymlink == 0 {
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This isn't going to work, normally only a os.ModePerm is passed in

flags = 0
}
}
return unix.Fchmodat(0, path, uint32(mode), flags)
}

// Getxattr returns all of the extended attributes for the file at path p.
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18 changes: 0 additions & 18 deletions sysx/chmod_darwin.go
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25 changes: 0 additions & 25 deletions sysx/chmod_darwin_386.go
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25 changes: 0 additions & 25 deletions sysx/chmod_darwin_amd64.go
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17 changes: 0 additions & 17 deletions sysx/chmod_freebsd.go
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25 changes: 0 additions & 25 deletions sysx/chmod_freebsd_amd64.go
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12 changes: 0 additions & 12 deletions sysx/chmod_linux.go
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11 changes: 0 additions & 11 deletions sysx/chmod_solaris.go
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1 change: 0 additions & 1 deletion sysx/xattr_darwin.go
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,6 @@ package sysx
//sys setxattr(path string, attr string, data []byte, flags int) (err error)
//sys removexattr(path string, attr string, options int) (err error)
//sys listxattr(path string, dest []byte, options int) (sz int, err error)
//sys Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)

const (
xattrNoFollow = 0x01
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