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util.go
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util.go
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// Copyright 2015 The rkt Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package common
import (
"fmt"
"os"
"path/filepath"
"strings"
)
// StringSliceWrapper is an implementation of flag.Value interface. It
// is basically a proxy that appends strings to an already existing
// strings slice.
type StringSliceWrapper struct {
Slice *[]string
}
func (wrapper *StringSliceWrapper) String() string {
if len(*wrapper.Slice) > 0 {
return fmt.Sprintf(`["%s"]`, strings.Join(*wrapper.Slice, `" "`))
}
return "[]"
}
func (wrapper *StringSliceWrapper) Set(str string) error {
*wrapper.Slice = append(*wrapper.Slice, str)
return nil
}
// Warn is just a shorter version of a formatted printing to
// stderr. It appends a newline for you.
func Warn(format string, values ...interface{}) {
fmt.Fprintf(os.Stderr, fmt.Sprintf("%s%c", format, '\n'), values...)
}
// Die is the same as Warn, but it quits with exit status 1 after
// printing a message.
func Die(format string, values ...interface{}) {
Warn(format, values...)
os.Exit(1)
}
// MapFilesToDirectories creates one entry for each file and directory
// passed. Result is a kind of cross-product. For files f1 and f2 and
// directories d1 and d2, the returned list will contain d1/f1 d2/f1
// d1/f2 d2/f2.
//
// The "files" part might be a bit misleading - you can pass a list of
// symlinks or directories there as well.
func MapFilesToDirectories(files, dirs []string) []string {
mapped := make([]string, 0, len(files)*len(dirs))
for _, f := range files {
for _, d := range dirs {
mapped = append(mapped, filepath.Join(d, f))
}
}
return mapped
}
// MustAbs returns an absolute path. It works like filepath.Abs, but
// panics if it fails.
func MustAbs(dir string) string {
absDir, err := filepath.Abs(dir)
if err != nil {
panic(fmt.Sprintf("Failed to get absolute path of a directory %q: %v\n", dir, err))
}
return filepath.Clean(absDir)
}