Exposes sys.Stat_t as a portable alternative to syscall.Stat_t (#1567)

Signed-off-by: Adrian Cole <adrian@tetrate.io>

sys/stat_linux.go

@@ -0,0 +1,32 @@
+//go:build (amd64 || arm64 || riscv64) && linux
+
+// Note: This expression is not the same as compiler support, even if it looks
+// similar. Platform functions here are used in interpreter mode as well.
+
+package sys
+
+import (
+	"io/fs"
+	"syscall"
+)
+
+const sysParseable = true
+
+func statFromFileInfo(info fs.FileInfo) Stat_t {
+	if d, ok := info.Sys().(*syscall.Stat_t); ok {
+		st := Stat_t{}
+		st.Dev = uint64(d.Dev)
+		st.Ino = uint64(d.Ino)
+		st.Mode = info.Mode()
+		st.Nlink = uint64(d.Nlink)
+		st.Size = d.Size
+		atime := d.Atim
+		st.Atim = atime.Sec*1e9 + atime.Nsec
+		mtime := d.Mtim
+		st.Mtim = mtime.Sec*1e9 + mtime.Nsec
+		ctime := d.Ctim
+		st.Ctim = ctime.Sec*1e9 + ctime.Nsec
+		return st
+	}
+	return defaultStatFromFileInfo(info)
+}