initial import

core/fs/files+polyfill.go

@@ -0,0 +1,8 @@
+// +build windows
+
+package fs
+
+import "os"
+
+func CloseOnExec(*os.File) {
+}

core/fs/files.go

@@ -0,0 +1,14 @@
+// +build linux darwin
+
+package fs
+
+import (
+	"os"
+	"syscall"
+)
+
+func CloseOnExec(file *os.File) {
+	if file != nil {
+		syscall.CloseOnExec(int(file.Fd()))
+	}
+}

core/fs/temps.go

@@ -0,0 +1,42 @@
+package fs
+
+import (
+	"io/ioutil"
+	"os"
+
+	"zero/core/hash"
+)
+
+// TempFileWithText creates the temporary file with the given content,
+// and returns the opened *os.File instance.
+// The file is kept as open, the caller should close the file handle,
+// and remove the file by name.
+func TempFileWithText(text string) (*os.File, error) {
+	tmpfile, err := ioutil.TempFile(os.TempDir(), hash.Md5Hex([]byte(text)))
+	if err != nil {
+		return nil, err
+	}
+
+	if err := ioutil.WriteFile(tmpfile.Name(), []byte(text), os.ModeTemporary); err != nil {
+		return nil, err
+	}
+
+	return tmpfile, nil
+}
+
+// TempFilenameWithText creates the file with the given content,
+// and returns the filename (full path).
+// The caller should remove the file after use.
+func TempFilenameWithText(text string) (string, error) {
+	tmpfile, err := TempFileWithText(text)
+	if err != nil {
+		return "", err
+	}
+
+	filename := tmpfile.Name()
+	if err = tmpfile.Close(); err != nil {
+		return "", err
+	}
+
+	return filename, nil
+}