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  1. 674
      LICENSE
  2. 75
      README.md
  3. 7
      build.sh
  4. BIN
      build/eltm-client
  5. BIN
      build/eltm-server
  6. 185
      eltm-client/downloadFile.go
  7. 63
      eltm-client/funcs.go
  8. 240
      eltm-client/main.go
  9. 1
      eltm-server/.gitignore
  10. 45
      eltm-server/funcs.go
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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
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How to Apply These Terms to Your New Programs
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if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

75
README.md
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# Eltm
Eltm stand for *External LXC Template Manager*. It was originally designed for my personal usage as a remplacement to the Proxmox template manager *(pveam)* that don't allow externals sources for template and don't have template upgrading system. Everything is solved with ELTM under the *GPLv3*.
Functionalities :
- Templates sources / mirrors
- Upgrading template
- Custom destinations
Work in Progress :
- Deleting templates (client & server)
- Absolute path for the template file (server)
Eltm is decomposed in 2 programs, `eltm-client` for the client and `eltm-server` for the mirror/source maintener to build the `eltm.list` file (that's list all packages and checksum).
The upgrade system is based on checksum difference between client & server.
# Add Debian repository
Eltm is originaly created for Proxmox Virtual Environment 5+. That's a Debian based system.
You can directly install the client and the server using the enPLS.org APT repository.
To add it :
W I P
# Eltm Client
Eltm Client is the part of ELTM that is on your Proxmox or LXC server.
## Installation
Install the package `eltm-client` and run it. It will create the config directory in `${HOME}/.config`/`{XDG_CONFIG_HOME}`.
After that add templates sources in `${HOME}/.config/maelg/eltm/mirrors.list` and configure the client using `config.ini` in the same folder.
## Commands
- `--update` update mirrors.
- `--install <template_name>` install the template `<template_name>`.
- `--upgrade` upgrade templates
# Eltm Server
This part is for repository mainteners.
Before all you need **your own webserver** like NGINX, Apache2 or Lighttpd that point to `webdir` in your config file (enable directory listing is recomanded).
## Install
Install the package `eltm-client`. Create a file in `${HOME}/.config/maelg/eltm/server.ini` and add :
```
[paths]
web = "<path to your web directory>"
```
## Commands
- `--add <template_file_name>` add the template `<template_file_name>` in the templates list.
- `--upgrade <template_file_name>` update the template `<template_file_name>` in the templates list.
Warning : make sur you're in the same folder of the template file, absolute paths don't work for the moment.
# Building
## Requirements
- Golang
- `gopkg.in/ini.v1`
- `github.com/shibukawa/configdir`
- `github.com/kyokomi/emoji`
## Build
Run `./build.sh` to build binaries for client & server.
Binaries will be outputed in `./build/`
# License
This code is under the GNU GENERAL PUBLIC LICENSE (see LICENSE file)

7
build.sh
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echo "Building client..."
go build -o ./build/eltm-client ./eltm-client
echo "Building server..."
go build -o ./build/eltm-server ./eltm-server
echo "Success. See ./build/ directory."

BIN
build/eltm-client
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BIN
build/eltm-server
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185
eltm-client/downloadFile.go
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package main
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"path"
"strconv"
"time"
"github.com/dustin/go-humanize"
"github.com/kyokomi/emoji"
)
func PrintDownloadPercent(done chan int64, path string, total int64) {
var stop bool = false
for {
select {
case <-done:
stop = true
default:
file, err := os.Open(path)
if err != nil {
log.Fatal(err)
}
fi, err := file.Stat()
if err != nil {
log.Fatal(err)
}
size := fi.Size()
if size == 0 {
size = 1
}
var percent float64 = float64(size) / float64(total) * 100
fmt.Printf("%.0f", percent)
fmt.Printf("%%")
}
if stop {
fmt.Printf("... 100%%\n")
break
}
time.Sleep(time.Second)
}
}
func DownloadFile(url string, dest string, filetype string) string {
file := path.Base(url)
emoji.Printf(":hourglass_not_done: Downloading %s from %s... ", filetype, url)
var path bytes.Buffer
path.WriteString(dest)
path.WriteString("/")
path.WriteString(file)
//start := time.Now()
out, err := os.Create(path.String())
if err != nil {
fmt.Println(path.String())
panic(err)
}
defer out.Close()
headResp, err := http.Head(url)
if err != nil {
panic(err)
}
defer headResp.Body.Close()
size, err := strconv.Atoi(headResp.Header.Get("Content-Length"))
if err != nil {
panic(err)
}
done := make(chan int64)
go PrintDownloadPercent(done, path.String(), int64(size))
resp, err := http.Get(url)
if err != nil {
panic(err)
}
defer resp.Body.Close()
htmlData, _ := ioutil.ReadAll(resp.Body)
n, err := io.Copy(out, resp.Body)
if err != nil {
panic(err)
}
done <- n
return string(htmlData)
//elapsed := time.Since(start)
//fmt.Printf("Completed in %s\n", elapsed)
}
// WriteCounter counts the number of bytes written to it. It implements to the io.Writer interface
// and we can pass this into io.TeeReader() which will report progress on each write cycle.
type WriteCounter struct {
Total uint64
Header uint64
}
func (wc *WriteCounter) Write(p []byte) (int, error) {
n := len(p)
wc.Total += uint64(n)
wc.PrintProgress()
return n, nil
}
func (wc WriteCounter) PrintProgress() {
// Clear the line by using a character return to go back to the start and remove
// the remaining characters by filling it with spaces
fmt.Printf("\r")
// Return again and print current status of download
// We use the humanize package to print the bytes in a meaningful way (e.g. 10 MB)
emoji.Printf(":hourglass_not_done: Progress : %s/%s", humanize.Bytes(wc.Total), humanize.Bytes(wc.Header))
}
// DownloadFile will download a url to a local file. It's efficient because it will
// write as it downloads and not load the whole file into memory. We pass an io.TeeReader
// into Copy() to report progress on the download.
func DownloadBigFile(filepath string, url string) error {
// Create the file, but give it a tmp file extension, this means we won't overwrite a
// file until it's downloaded, but we'll remove the tmp extension once downloaded.
out, err := os.Create(filepath + ".tmp")
if err != nil {
return err
}
// Get the data
resp, err := http.Get(url)
if err != nil {
out.Close()
return err
}
defer resp.Body.Close()
size, _ := strconv.Atoi(resp.Header.Get("Content-Length"))
downloadSize := uint64(size)
// Create our progress reporter and pass it to be used alongside our writer
counter := &WriteCounter{Header: downloadSize}
if _, err = io.Copy(out, io.TeeReader(resp.Body, counter)); err != nil {
out.Close()
return err
}
// The progress use the same line so print a new line once it's finished downloading
fmt.Print("\n")
// Close the file without defer so it can happen before Rename()
out.Close()
if err = os.Rename(filepath+".tmp", filepath); err != nil {
return err
}
return nil
}

63
eltm-client/funcs.go
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package main
import (
"crypto/sha256"
"fmt"
"io"
"os"
"strings"
"github.com/kyokomi/emoji"
)
func fileExists(filename string) bool {
info, err := os.Stat(filename)
if os.IsNotExist(err) {
return false
}
return !info.IsDir()
}
func createFile(path string) {
// check if file exists
var _, err = os.Stat(path)
if os.IsNotExist(err) {
var file, _ = os.Create(path)
defer file.Close()
}
}
func contains(arr []string, str string) bool {
for _, a := range arr {
if a == str {
return true
}
}
return false
}
func installPackage(packageLine string) bool {
packageSplit := strings.Split(packageLine, "|")
packageName := packageSplit[2]
packageURL := packageSplit[0]
packageChecksum := packageSplit[1]
emoji.Println(":hourglass_not_done: Downloading ", packageURL) //download package
err := DownloadBigFile(cachePath+packageName+".tar.gz", packageURL)
check(err)
emoji.Println(":check_mark_button: Template downloaded !")
emoji.Println(":hourglass_not_done: Checking integrity...") //checking checksum
downloadedFile, err := os.Open(cachePath + packageName + ".tar.gz")
check(err)
defer downloadedFile.Close()
h := sha256.New()
_, err = io.Copy(h, downloadedFile)
check(err)
if fmt.Sprintf("%x", h.Sum(nil)) == packageChecksum { //valid checksum
emoji.Println(":check_mark_button: Integrity checked !")
return true
} else { //checksum invalid
emoji.Printf(":cross_mark: Integrity not checked. Call the mirror administrator or retry.\n")
return false
}
}

240
eltm-client/main.go
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package main
import (
"bufio"
"flag"
"fmt"
"io/ioutil"
"os"
"strings"
"time"
"github.com/kyokomi/emoji"
"github.com/shibukawa/configdir"
"gopkg.in/ini.v1"
)
func check(e error) {
if e != nil {
panic(e)
}
}
var configFolder string
var dataPath string
var cachePath string
func main() {
fmt.Print("External LXC Template Manager v0.1\n")
fmt.Print("Distributed in GNU GPL v3 by Maël G. <mael@enpls.org>\n\n")
configDirs := configdir.New("maelg", "eltm")
folder := configDirs.QueryFolderContainsFile("config.ini")
if folder != nil {
cfg, err := ini.Load(folder.Path + "/config.ini")
if err != nil {
emoji.Printf(":cross_mark: Fail to read config file in %v.", err)
os.Exit(1)
}
if cfg.Section("paths").Key("template_directory").String() == "" || cfg.Section("paths").Key("cache").String() == "" {
emoji.Printf(":cross_mark: Fail to read config file. Check required variables.\n")
return
}
dataPath = cfg.Section("paths").Key("template_directory").String()
cachePath = cfg.Section("paths").Key("cache").String()
configFolder = folder.Path
emoji.Print(":check_mark_button: Config loaded\n")
} else {
emoji.Printf(":cross_mark: Configuration file not found.\n")
folders := configDirs.QueryFolders(configdir.Global)
folders[0].WriteFile("config.ini", []byte("[paths]\ntemplate_directory=./templates/cache/\ncache=/tmp/"))
emoji.Printf(":check_mark_button: Configuration file created with default config in %v/config.ini\n", folders[0].Path)
return
}
flagUpdate := flag.Bool("update", false, "Update packages")
flagUpgrade := flag.Bool("upgrade", false, "Upgrade packages")
var flagInstall string
flag.StringVar(&flagInstall, "install", "", "Install package <name>")
flag.Parse()
if *flagUpdate == true {
update()
} else if *flagUpgrade == true {
upgrade()
} else if flagInstall != "" {
install(flagInstall)
} else {
print("Error : Please enter an argument.\n")
print("Type --help for argument list.\n")
}
}
func update() {
emoji.Printf(":hourglass_not_done: Reading package list...\n")
if !fileExists(configFolder + "mirrors.list") {
emoji.Printf(":cross_mark: Please create your mirrors.list file in your config folder. (RTFM)\n")
return
}
file, err := os.Open(configFolder + "/mirrors.list")
check(err)
_ = os.Mkdir(dataPath, 0777)
err = ioutil.WriteFile(configFolder+"/files.list", []byte(""), 0644) //CLEAR THE FILES.LIST
check(err)
scanner := bufio.NewScanner(file)
var urls []string
for scanner.Scan() {
file := DownloadFile(scanner.Text()+"eltm.list", cachePath, "list") //Download file in cache
urls = strings.Split(file, "\n")
list, err := os.OpenFile(configFolder+"/files.list", os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0644) //OPEN THE FILES LIST FOR APPENDING
check(err)
for _, url := range urls {
if url != "" {
fileName := strings.Split(strings.Split(url, "|")[0], ".tar")[0]
fmt.Fprintln(list, scanner.Text()+url+"|"+fileName)
}
}
err = list.Close()
}
emoji.Printf(":check_mark_button: Have %v templates from repositories.\n", len(urls))
}
func install(searchPkg string) {
emoji.Printf(":magnifying_glass_tilted_left: Searching for template \"" + searchPkg + "\" in cache\n")
//CHECK IF CACHE EXIST
if !fileExists(configFolder + "/files.list") {
emoji.Printf(":cross_mark: Unable to find the cache. Did you update it for the first time with --update ?\n")
return
} //IF TRUE LOAD IT
packageListFile, _ := ioutil.ReadFile(configFolder + "/files.list")
packagesList := strings.Split(string(packageListFile), "\n")
//CHECK IF PACKAGE ALREADY INSTALLED
if fileExists(configFolder + "/installed.list") { //IF The installed list don't exist ignore
installedListFile, err := ioutil.ReadFile(configFolder + "/installed.list")
check(err)
installedList := strings.Split(string(installedListFile), "\n")
for _, packageLine := range installedList {
if packageLine != "" {
installedPackageName := strings.Split(packageLine, "|")[2]
if installedPackageName == searchPkg {
emoji.Printf(":cross_mark: Package %v already installed. Do you want to upgrade it with --upgrade ?\n", searchPkg)
return
}
}
}
}
//IF PACKAGE EXISTS
var Success bool //intialize var to check if package is in cache
for _, packageLine := range packagesList {
if packageLine != "" {
packageSplit := strings.Split(packageLine, "|")
packageName := packageSplit[2]
if packageName == searchPkg {
emoji.Println(":check_mark_button: Package found !")
if installPackage(packageLine) {
installedList, err := os.OpenFile(configFolder+"/installed.list", os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0644) //OPEN THE FILES LIST FOR APPENDING
check(err)
fmt.Fprintln(installedList, packageLine+"")
}
Success = true //package found and installed
break
}
}
}
if Success == false { //package not found
emoji.Printf(":cross_mark: Unable to find %v package. Did you update the cache with --update ?\n", searchPkg)
}
}
func upgrade() {
//CHECK IF !ANY! PACKAGE ALREADY INSTALLED
emoji.Printf(":hourglass_not_done: Reading installed package list...\n")
if !fileExists(configFolder + "/installed.list") { //IF The installed list don't exist ignore
emoji.Printf(":cross_mark: You don't installed any package yet... What do you want to upgrade lmao.\n")
return
}
installedListFile, err := ioutil.ReadFile(configFolder + "/installed.list")
check(err)
installedList := strings.Split(string(installedListFile), "\n")
//CHECK IF CACHE EXIST
emoji.Printf(":hourglass_not_done: Reading package list...\n")
if !fileExists(configFolder + "/files.list") {
emoji.Printf(":cross_mark: Unable to find the cache. Did you update it for the first time with --update ?\n")
return
}
packageListFile, err := ioutil.ReadFile(configFolder + "/files.list")
check(err)
packagesList := strings.Split(string(packageListFile), "\n")
//CHECKING FOR UPGRADEs
var upgradeList []string //Will stock each upgradable template line as string
var upgradeListName string //Will only stock their name as string
var upgradeLines []int //Will stock the line nubmer of each upgrade template line as int
for line, installedPackageLine := range installedList {
if installedPackageLine != "" {
iPackageSplit := strings.Split(installedPackageLine, "|")
iPackageName := iPackageSplit[2]
for _, availablePackageLine := range packagesList {
if availablePackageLine != "" {
aPackageSplit := strings.Split(availablePackageLine, "|")
aPackageName := aPackageSplit[2]
if iPackageName == aPackageName {
iPackageChecksum := iPackageSplit[1]
aPackageChecksum := aPackageSplit[1]
if iPackageChecksum != aPackageChecksum {
upgradeListName = upgradeListName + aPackageName + " "
upgradeList = append(upgradeList, availablePackageLine)
upgradeLines = append(upgradeLines, line)
}
}
}
}
}
}
//WARN FOR UGPRADES
if upgradeListName != "" {
emoji.Printf(":NEW_button: Available to upgrade : %v\n", upgradeListName)
} else {
emoji.Printf(":cross_mark: No template available for upgrade. Did you update the cache with --update ?\n")
return
}
//WAIT FOR USER CHECK
emoji.Printf(":hourglass_not_done: !!! Press CTRL + C to cancel upgrade (5 seconds delay) !!! :hourglass_not_done:\n\n")
time.Sleep(time.Second * 5)
//FOR EACH UPGRADABLE PACKAGE
for i, upgradePackage := range upgradeList {
packageName := strings.Split(upgradePackage, "|")[2]
emoji.Printf(":hourglass_not_done: Upgrading template %v...\n", packageName)
if installPackage(upgradePackage) {
lines := strings.Split(string(installedListFile), "\n")
lines[upgradeLines[i]] = upgradePackage
output := strings.Join(lines, "\n")
err = ioutil.WriteFile(configFolder+"/installed.list", []byte(output), 0644)
check(err)
emoji.Printf(":check_mark_button: Package %v upgraded !\n", packageName)
} else {
emoji.Printf(":cross_mark: Can't upgrade package %v \n", packageName)
}
}
}

1
eltm-server/.gitignore
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eltm-server

45
eltm-server/funcs.go
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@ -0,0 +1,45 @@
package main
import (
"crypto/sha256"
"encoding/hex"
"io"
"os"
)
func fileExists(filename string) bool {
info, err := os.Stat(filename)
if os.IsNotExist(err) {
return false
}
return !info.IsDir()
}
func createFile(path string) {
// check if file exists
var _, err = os.Stat(path)
if os.IsNotExist(err) {
var file, _ = os.Create(path)
defer file.Close()
}
}
func contains(arr []string, str string) bool {
for _, a := range arr {
if a == str {
return true
}
}
return false
}
func makeChecksum(filePath string) string {
//Hashing template
f, err := os.Open(filePath)
check(err)
defer f.Close()
hash := sha256.New()
_, err = io.Copy(hash, f)
check(err)
return hex.EncodeToString(hash.Sum(nil))
}

142
eltm-server/main.go
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package main
import (
"flag"
"fmt"
"io/ioutil"
"os"
"strings"
"gopkg.in/ini.v1"
)
func check(e error) {
if e != nil {
panic(e)
}
}
var cfgwebdir string
func main() {
if !fileExists("./config.ini") {
print("Please create config file (RTFM).\n")
} else {
fmt.Print("External LXC Template Manager Server Version v0.1\n")
fmt.Print("Distributed in GNU GPL v3 by Maël G. <mael@enpls.org>\n\n")
//Load config
cfg, err := ini.Load("./config.ini")
check(err)
cfgwebdir = cfg.Section("paths").Key("webdir").String()
var flagUpgrade string
flag.StringVar(&flagUpgrade, "upgrade", "", "Upgrade package <filename> in packagelist")
var flagAdd string
flag.StringVar(&flagAdd, "add", "", "Add package <filename> in packagelist")
flag.Parse()
if flagAdd != "" {
packageAdd(flagAdd)
} else if flagUpgrade != "" {
packageUpgrade(flagUpgrade)
} else {
print("Error : Please enter an argument.\n")
print("Type --help for argument list.\n")
}
}
}
//Add package <template> into package list
func packageAdd(template string) {
fmt.Printf("Adding package %s in template list.\n", template)
createFile(cfgwebdir + "/eltm.list")
packageListFile, _ := ioutil.ReadFile(cfgwebdir + "/eltm.list")
packagesList := strings.Split(string(packageListFile), "\n")
//Checking if file exists
if !fileExists(template) {
print("The template/package you wan't to add don't exist, check if file exists.\n")
return
}
//Checking if already listed
for _, packageLine := range packagesList {
availablePkgName := strings.Split(packageLine, "|")[0]
if availablePkgName == template {
print("Error, package already in the list, upgrade it or delete it.\n")
return
}
}
//Open eltm.list to add it
packagesListWrite, err := os.OpenFile(cfgwebdir+"/eltm.list", os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0644)
check(err)
fmt.Fprintf(packagesListWrite, "\n%s|%s", template, makeChecksum(template))
//Copy paste the template
templateFile, err := ioutil.ReadFile(template)
check(err)
err = ioutil.WriteFile(cfgwebdir+"/"+template, templateFile, 0644)
check(err)
fmt.Print("Package added.")
}
//Upgrade existing <template> into package list
func packageUpgrade(template string) {
fmt.Printf("Upgrading package %s in template list.\n", template)
//Check if any packages already added
if !fileExists(cfgwebdir + "/eltm.list") {
print("You didn't install any package yet ! Aborting...\n")
return
}
//Checking if file exists
if !fileExists(template) {
print("The template/package you wan't to add don't exist, check if file exists.\n")
return
}
packageListFile, _ := ioutil.ReadFile(cfgwebdir + "/eltm.list")
packagesList := strings.Split(string(packageListFile), "\n")
var pkgExists bool //Need later to check if template already in list
var outputList []string //New content base on actual packagesList and modified line
for _, packageLine := range packagesList {
if packageLine != "" {
availablePkgName := strings.Split(packageLine, "|")[0]
availablePkgSum := strings.Split(packageLine, "|")[1]
if availablePkgName == template {
if availablePkgSum == makeChecksum(template) { //If checksums are equals
print("Error, no changes apported to the template. Aborting.\n")
return
} else {
outputList = append(outputList, template+"|"+makeChecksum(template)) //Append new version
pkgExists = true
}
} else {
outputList = append(outputList, packageLine) //Append current versions
}
}
}
if pkgExists == false {
print("Error, template/package do not exist in the list, maybe you want to add it using the add command ? Aborting...\n")
return
}
//Write outputList
output := strings.Join(outputList, "\n")
err := ioutil.WriteFile(cfgwebdir+"/eltm.list", []byte(output), 0644)
check(err)
//Copy paste the template
templateFile, err := ioutil.ReadFile(template)
check(err)
err = ioutil.WriteFile(cfgwebdir+"/"+template, templateFile, 0644)
check(err)
print("Package upgraded.\n")
}
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