// hasWritePerm reports whether the current user has permission to write to the
// file with the given info.
private static bool hasWritePerm(@string _, os.FileInfo fi)
{
// Windows has a read-only attribute independent of ACLs, so use that to
// determine whether the file is intended to be overwritten.
//
// Per https://golang.org/pkg/os/#Chmod:
// “On Windows, only the 0200 bit (owner writable) of mode is used; it
// controls whether the file's read-only attribute is set or cleared.”
return(fi.Mode() & 0200L != 0L);
}
// hasWritePerm reports whether the current user has permission to write to the
// file with the given info.
//
// Although the root user on most Unix systems can write to files even without
// permission, hasWritePerm reports false if no appropriate permission bit is
// set even if the current user is root.
private static bool hasWritePerm(@string path, os.FileInfo fi)
{
if (os.Getuid() == 0L)
{
// The root user can access any file, but we still want to default to
// read-only mode if the go.mod file is marked as globally non-writable.
// (If the user really intends not to be in readonly mode, they can
// pass -mod=mod explicitly.)
return(fi.Mode() & 0222L != 0L);
}
const ulong W_OK = (ulong)0x2UL;
return(syscall.Access(path, W_OK) == null);
}
// FileInfoHeader creates a partially-populated FileHeader from an
// os.FileInfo.
// Because os.FileInfo's Name method returns only the base name of
// the file it describes, it may be necessary to modify the Name field
// of the returned header to provide the full path name of the file.
// If compression is desired, callers should set the FileHeader.Method
// field; it is unset by default.
public static (ref FileHeader, error) FileInfoHeader(os.FileInfo fi)
{
var size = fi.Size();
FileHeader fh = ref new FileHeader(Name: fi.Name(), UncompressedSize64: uint64(size), );
fh.SetModTime(fi.ModTime());
fh.SetMode(fi.Mode());
if (fh.UncompressedSize64 > uint32max)
{
fh.UncompressedSize = uint32max;
}
else
{
fh.UncompressedSize = uint32(fh.UncompressedSize64);
}
return(fh, null);
}
