go-mtree/cmd/gomtree/main.go

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package main
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"strings"
"github.com/vbatts/go-mtree"
)
var (
flCreate = flag.Bool("c", false, "create a directory hierarchy spec")
flFile = flag.String("f", "", "directory hierarchy spec to validate")
flPath = flag.String("p", "", "root path that the hierarchy spec is relative to")
flAddKeywords = flag.String("K", "", "Add the specified (delimited by comma or space) keywords to the current set of keywords")
flUseKeywords = flag.String("k", "", "Use the specified (delimited by comma or space) keywords as the current set of keywords")
flListKeywords = flag.Bool("list-keywords", false, "List the keywords available")
flResultFormat = flag.String("result-format", "bsd", "output the validation results using the given format (bsd, json, path)")
flTar = flag.String("T", "", "use tar archive to create or validate a directory hierarchy spec (\"-\" indicates stdin)")
flBsdKeywords = flag.Bool("bsd-keywords", false, "only operate on keywords that are supported by upstream mtree(8)")
flListUsedKeywords = flag.Bool("list-used", false, "list all the keywords found in a validation manifest")
flDebug = flag.Bool("debug", false, "output debug info to STDERR")
flVersion = flag.Bool("version", false, "display the version of this tool")
)
var formats = map[string]func(*mtree.Result) string{
// Outputs the errors in the BSD format.
"bsd": func(r *mtree.Result) string {
var buffer bytes.Buffer
for _, fail := range r.Failures {
fmt.Fprintln(&buffer, fail)
}
return buffer.String()
},
// Outputs the full result struct in JSON.
"json": func(r *mtree.Result) string {
var buffer bytes.Buffer
if err := json.NewEncoder(&buffer).Encode(r); err != nil {
panic(err)
}
return buffer.String()
},
// Outputs only the paths which failed to validate.
"path": func(r *mtree.Result) string {
var buffer bytes.Buffer
for _, fail := range r.Failures {
fmt.Fprintln(&buffer, fail.Path)
}
return buffer.String()
},
}
func main() {
flag.Parse()
if *flDebug {
os.Setenv("DEBUG", "1")
}
// so that defers cleanly exec
var isErr bool
defer func() {
if isErr {
os.Exit(1)
}
}()
if *flVersion {
fmt.Printf("%s :: %s\n", os.Args[0], mtree.Version)
return
}
// -list-keywords
if *flListKeywords {
fmt.Println("Available keywords:")
for k := range mtree.KeywordFuncs {
fmt.Print(" ")
fmt.Print(k)
if mtree.Keyword(k).Default() {
fmt.Print(" (default)")
}
if !mtree.Keyword(k).Bsd() {
fmt.Print(" (not upstream)")
}
fmt.Print("\n")
}
return
}
// --result-format
formatFunc, ok := formats[*flResultFormat]
if !ok {
log.Printf("invalid output format: %s", *flResultFormat)
isErr = true
return
}
var (
tmpKeywords []string
currentKeywords []string
)
// -k <keywords>
if *flUseKeywords != "" {
tmpKeywords = splitKeywordsArg(*flUseKeywords)
if !inSlice("type", tmpKeywords) {
tmpKeywords = append([]string{"type"}, tmpKeywords...)
}
} else {
if *flTar != "" {
tmpKeywords = mtree.DefaultTarKeywords[:]
} else {
tmpKeywords = mtree.DefaultKeywords[:]
}
}
// -K <keywords>
if *flAddKeywords != "" {
for _, kw := range splitKeywordsArg(*flAddKeywords) {
if !inSlice(kw, tmpKeywords) {
tmpKeywords = append(tmpKeywords, kw)
}
}
}
// -bsd-keywords
if *flBsdKeywords {
for _, k := range tmpKeywords {
if mtree.Keyword(k).Bsd() {
currentKeywords = append(currentKeywords, k)
} else {
fmt.Fprintf(os.Stderr, "INFO: ignoring %q as it is not an upstream keyword\n", k)
}
}
} else {
currentKeywords = tmpKeywords
}
// -f <file>
var dh *mtree.DirectoryHierarchy
if *flFile != "" && !*flCreate {
// load the hierarchy, if we're not creating a new spec
fh, err := os.Open(*flFile)
if err != nil {
log.Println(err)
isErr = true
return
}
dh, err = mtree.ParseSpec(fh)
fh.Close()
if err != nil {
log.Println(err)
isErr = true
return
}
}
// -list-used
if *flListUsedKeywords {
if *flFile == "" {
log.Println("no specification provided. please provide a validation manifest")
defer os.Exit(1)
isErr = true
return
}
usedKeywords := mtree.CollectUsedKeywords(dh)
if *flResultFormat == "json" {
// if they're asking for json, give it to them
data := map[string][]string{*flFile: usedKeywords}
buf, err := json.MarshalIndent(data, "", " ")
if err != nil {
defer os.Exit(1)
isErr = true
return
}
fmt.Println(string(buf))
} else {
fmt.Printf("Keywords used in [%s]:\n", *flFile)
for _, kw := range usedKeywords {
fmt.Printf(" %s", kw)
if _, ok := mtree.KeywordFuncs[kw]; !ok {
fmt.Print(" (unsupported)")
}
fmt.Printf("\n")
}
}
return
}
// -p <path>
var rootPath = "."
if *flPath != "" {
rootPath = *flPath
}
// -T <tar file>
var tdh *mtree.DirectoryHierarchy
if *flTar != "" {
var input io.Reader
if *flTar == "-" {
input = os.Stdin
} else {
fh, err := os.Open(*flTar)
if err != nil {
log.Println(err)
isErr = true
return
}
defer fh.Close()
input = fh
}
ts := mtree.NewTarStreamer(input, currentKeywords)
if _, err := io.Copy(ioutil.Discard, ts); err != nil && err != io.EOF {
log.Println(err)
isErr = true
return
}
if err := ts.Close(); err != nil {
log.Println(err)
isErr = true
return
}
var err error
tdh, err = ts.Hierarchy()
if err != nil {
log.Println(err)
isErr = true
return
}
}
// -c
if *flCreate {
// create a directory hierarchy
// with a tar stream
if tdh != nil {
tdh.WriteTo(os.Stdout)
} else {
// with a root directory
dh, err := mtree.Walk(rootPath, nil, currentKeywords)
if err != nil {
log.Println(err)
isErr = true
return
}
dh.WriteTo(os.Stdout)
}
} else if tdh != nil || dh != nil {
var res *mtree.Result
var err error
// else this is a validation
if *flTar != "" {
res, err = mtree.TarCheck(tdh, dh, currentKeywords)
} else {
res, err = mtree.Check(rootPath, dh, currentKeywords)
}
if err != nil {
log.Println(err)
isErr = true
return
}
if res != nil && len(res.Failures) > 0 {
defer os.Exit(1)
out := formatFunc(res)
if _, err := os.Stdout.Write([]byte(out)); err != nil {
log.Println(err)
isErr = true
return
}
}
if res != nil {
if len(res.Extra) > 0 {
defer os.Exit(1)
for _, extra := range res.Extra {
extrapath, err := extra.Path()
if err != nil {
log.Println(err)
isErr = true
return
}
fmt.Printf("%s extra\n", extrapath)
}
}
if len(res.Missing) > 0 {
defer os.Exit(1)
for _, missing := range res.Missing {
missingpath, err := missing.Path()
if err != nil {
log.Println(err)
isErr = true
return
}
fmt.Printf("%s missing\n", missingpath)
}
}
}
} else {
log.Println("neither validating or creating a manifest. Please provide additional arguments")
isErr = true
defer os.Exit(1)
return
}
}
func splitKeywordsArg(str string) []string {
return strings.Fields(strings.Replace(str, ",", " ", -1))
}
func inSlice(a string, list []string) bool {
for _, b := range list {
if b == a {
return true
}
}
return false
}