add stuff

master
vilmibm 2020-06-08 16:04:41 +00:00
parent f22eed1f09
commit ed2fa4ab89
3 changed files with 290 additions and 0 deletions

8
go.mod 100644
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module git.tilde.town/tildetown/town-launcher
go 1.14
require (
github.com/spf13/cobra v1.0.0
gopkg.in/yaml.v3 v3.0.0-20200605160147-a5ece683394c
)

128
go.sum 100644
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github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
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github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
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github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
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gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v3 v3.0.0-20200605160147-a5ece683394c h1:grhR+C34yXImVGp7EzNk+DTIk+323eIUWOmEevy6bDo=
gopkg.in/yaml.v3 v3.0.0-20200605160147-a5ece683394c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

154
main.go 100644
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@ -0,0 +1,154 @@
package main
import (
"fmt"
"io/ioutil"
"os"
"os/exec"
"os/user"
"path/filepath"
"strings"
"github.com/spf13/cobra"
"gopkg.in/yaml.v3"
)
const binroot = "/town/launcher"
var rootCmd = &cobra.Command{
Use: "town",
Short: "Run commands unique to tilde.town",
}
var contribCmd = &cobra.Command{
Use: "contrib",
Short: "community-maintained town commands",
}
var adminCmd = &cobra.Command{
Use: "admin",
Short: "commands used for administering the town",
}
func isAdmin() (bool, error) {
u, err := user.Current()
if err != nil {
return false, fmt.Errorf("failed to get information about current user: %w", err)
}
adminGroup, err := user.LookupGroup("admin")
if err != nil {
return false, fmt.Errorf("failed to get admin group info: %w", err)
}
groupIds, err := u.GroupIds()
if err != nil {
return false, fmt.Errorf("failed to get groups info: %w", err)
}
for _, groupId := range groupIds {
if groupId == adminGroup.Gid {
return true, nil
}
}
return false, nil
}
func init() {
rootCmd.AddCommand(contribCmd)
parseCommands(rootCmd, "core")
parseCommands(contribCmd, "contrib")
admin, err := isAdmin()
if err != nil {
panic(fmt.Sprintf("failed to check admin status: %s", err))
}
if admin {
rootCmd.AddCommand(adminCmd)
parseCommands(adminCmd, "admin")
}
// I feel like the example/documentation yaml can be frontmatter for non-binary files. to start
// i'll just do the accompanying yaml file.
}
func parseCommands(targetCmd *cobra.Command, path string) {
binPath := filepath.Join(binroot, path)
files, err := ioutil.ReadDir(binPath)
if err != nil {
panic(fmt.Sprintf("failed to list directory %s: %s", binPath, err))
}
for _, file := range files {
if strings.HasSuffix(file.Name(), "yml") {
parseCommand(targetCmd, filepath.Join(binPath, file.Name()))
}
}
}
type commandDoc struct {
ShortDesc string `yaml:"shortDesc"`
LongDesc string `yaml:"longDesc"`
Examples string
}
func parseCommand(targetCmd *cobra.Command, yamlPath string) {
executablePath := strings.TrimSuffix(yamlPath, ".yml")
// TODO handle when files lack executable bit
_, err := os.Stat(executablePath)
if err != nil {
fmt.Fprintf(os.Stderr, "could not find matching executable for %s; skipping...", yamlPath)
return
}
yamlBytes, err := ioutil.ReadFile(yamlPath)
if err != nil {
fmt.Fprintf(os.Stderr, "could not read %s; skipping...", yamlPath)
return
}
doc := commandDoc{}
err = yaml.Unmarshal(yamlBytes, &doc)
if err != nil {
fmt.Fprintf(os.Stderr, "could not parse %s; skipping...", yamlPath)
return
}
parsedCmd := &cobra.Command{
Use: filepath.Base(executablePath),
RunE: execWrapper(executablePath),
}
if doc.ShortDesc != "" {
parsedCmd.Short = doc.ShortDesc
}
if doc.LongDesc != "" {
parsedCmd.Long = doc.LongDesc
}
if doc.Examples != "" {
parsedCmd.Example = doc.Examples
}
targetCmd.AddCommand(parsedCmd)
}
func execWrapper(executablePath string) func(*cobra.Command, []string) error {
return func(cmd *cobra.Command, args []string) error {
execCmd := exec.Command(executablePath, args...)
execCmd.Stderr = os.Stderr
execCmd.Stdout = os.Stdout
execCmd.Stdin = os.Stdin
return execCmd.Run()
}
}
func main() {
rootCmd.Execute()
}