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out.go
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out.go
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// Copyright (C) 2014 Space Monkey, Inc.
//
// 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 flagfile
import (
"flag"
"io"
"log"
"os"
"github.com/spacemonkeygo/flagfile/parser"
)
var (
flagOutPath = flag.String("flagout", "",
"a file in which to write all configured settings")
)
func flagOut() {
if *flagOutPath != "" {
err := DumpToPath(*flagOutPath)
if err != nil {
log.Printf("failed writing requested flagout file: %s", err)
}
}
}
// Dump will write all configured flags to the given io.Writer in the flagfile
// serialization format for later parsing.
func Dump(out io.Writer) error {
mtx.Lock()
defer mtx.Unlock()
vals := make(map[string]string)
flag.VisitAll(func(f *flag.Flag) {
if !isAlias(f.Name) {
vals[f.Name] = f.Value.String()
}
})
return parser.Serialize(vals, out)
}
// DumpMyFlag will write all flags contained in the flags array to the given io.Writer in the flagfile
// serialization format for later parsing.
func DumpMyFlags(myflags []string,out io.Writer) error{
mtx.Lock()
defer mtx.Unlock()
vals := make(map[string]string)
flag.VisitAll(func (f *flag.Flag){
for _,flg := range myflags {
if f.Name == flg {
vals[f.Name] = f.Value.String()
}
}
})
return parser.Serialize(vals,out)
}
// DumpToPath simply calls DumpMyFlags on a new filehandle (O_CREATE|O_TRUNC) for the
// given path
func DumpMyFlagsToPath(myflags []string,path string) error{
fh, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC,
0600)
if err != nil {
return err
}
defer fh.Close()
return DumpMyFlags(myflags,fh)
}
// DumpToPath simply calls Dump on a new filehandle (O_CREATE|O_TRUNC) for the
// given path
func DumpToPath(path string) error {
fh, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC,
0600)
if err != nil {
return err
}
defer fh.Close()
return Dump(fh)
}