Auto guess binary file name

This commit is contained in:
Mikhail Klementev 2020-01-02 15:16:06 +00:00
parent 43d42c2242
commit bc704df503
No known key found for this signature in database
GPG key ID: BE44DA8C062D87DC

View file

@ -1,6 +1,7 @@
package main
import (
"errors"
"fmt"
"io/ioutil"
"log"
@ -42,9 +43,55 @@ func nixPath(name string) (path string, err error) {
return
}
func generate(l *libvirt.Libvirt, name, bin, vmname string) {
func guessChannel() (channel string, err error) {
command := exec.Command("nix-channel", "--list")
bytes, err := command.Output()
if err != nil {
return
}
channels := strings.Split(string(bytes), "\n")
for _, line := range channels {
fields := strings.Fields(line)
if len(fields) == 2 {
channel = fields[0]
return
}
}
err = errors.New("No channel found")
return
}
func filterDotfiles(files []os.FileInfo) (notHiddenFiles []os.FileInfo) {
for _, f := range files {
if !strings.HasPrefix(f.Name(), ".") {
notHiddenFiles = append(notHiddenFiles, f)
}
}
return
}
func generate(l *libvirt.Libvirt, pkg, bin, vmname string) {
var name string
if strings.Contains(pkg, ".") {
name = pkg
} else {
log.Println("Package name does not contains channel")
log.Println("Trying to guess")
channel, err := guessChannel()
if err != nil {
log.Println("Cannot guess channel")
log.Println("Check nix-channel --list")
return
}
name = channel + "." + pkg
log.Println("Use", name)
}
if !isPackageExists(name) {
log.Println("Package pkgs."+name, "does not exists")
log.Println("Package", name, "does not exists")
return
}
@ -63,13 +110,37 @@ func generate(l *libvirt.Libvirt, name, bin, vmname string) {
}
if bin == "" && len(files) != 1 {
fmt.Println("There's more than one binary in */bin, " +
"you should specify one of them explicitly")
fmt.Println("There's more than one binary in */bin")
fmt.Println("Files in", path+"/bin/:")
for _, f := range files {
fmt.Println("\t", f.Name())
}
return
log.Println("Trying to guess binary")
var found bool = false
notHiddenFiles := filterDotfiles(files)
if len(notHiddenFiles) == 1 {
log.Println("Use", notHiddenFiles[0].Name())
bin = notHiddenFiles[0].Name()
found = true
}
if !found {
for _, f := range files {
if f.Name() == pkg {
log.Println("Use", f.Name())
bin = f.Name()
found = true
}
}
}
if !found {
log.Println("Cannot guess in */bin, " +
"you should specify one of them explicitly")
return
}
}
if bin != "" {