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Note that the cmd is and will always be licensed under GPL, NOT LGPL, like the rest of the program.
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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>.

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package main
import (
"eternity/common"
"eternity/lib"
"fmt"
"os"
"os/signal"
"path/filepath"
)
func main() {
if len(os.Args) < 2 {
fmt.Println("Usage: eternity <build/generate/convert/repo/package>")
os.Exit(1)
}
logger := &common.DefaultLogger
for i, arg := range os.Args {
if arg == "--help" || arg == "-h" || (i != 1 && arg == "help") {
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "To ask for help, use 'eternity help <build/generate/convert/repo/package>, not --help, -h, or eternity <command> help.",
})
}
}
switch os.Args[1] {
case "build":
inMemory := true
if len(os.Args) > 2 {
if os.Args[2] == "-d" || os.Args[2] == "--disk" {
inMemory = false
}
}
privateKey, err, vagueError := common.LoadPrivateKey(logger)
if err != nil || vagueError != nil {
common.LoadPrivateKeyHandleError(err, vagueError, logger)
}
config, err, vagueError := lib.ParseConfig("eternity.json", logger)
if err != nil || vagueError != nil {
common.EternityJsonHandleError(err, vagueError, logger)
} else {
var tempDir string
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
for sig := range c {
fmt.Println("\nCaught", sig, "signal, exiting...")
if tempDir != "" {
common.BuildEPKRemoveTemporaryDirectory(tempDir, logger)
}
os.Exit(1)
}
}()
tempDir, err, vagueError = lib.BuildEPK("./", inMemory, config.Build, logger)
if err != nil || vagueError != nil {
common.BuildEPKHandleError(tempDir, err, vagueError, logger)
} else {
filePath := filepath.Join("./", config.Metadata.Name+"-"+config.Metadata.Version.String())
err, vagueError := lib.PackageEPK(config.Metadata, config.Build, tempDir, filePath+".epk", privateKey, logger)
if err != nil || vagueError != nil {
common.PackageEPKHandleError(err, vagueError, logger)
} else {
common.BuildEPKRemoveTemporaryDirectory(tempDir, logger)
logger.LogFunc(lib.Log{
Level: "INFO",
Content: "Successfully built and packaged EPK at " + filePath + ".epk",
})
}
}
}
case "help":
if len(os.Args) > 2 {
switch os.Args[2] {
case "build":
fmt.Println("Usage: eternity build [-d/--disk]")
fmt.Println(" -d, --disk Build EPK on disk instead of in memory. This is useful for large EPKs.")
case "convert":
fmt.Println("Usage: eternity convert </path/to/rpm> [</path/to/output/epk>]")
case "repo":
fmt.Println("Usage: eternity repo <build/generate> <directory>")
fmt.Println(" build Build a repository from a directory containing EPK project directories.")
fmt.Println(" generate Generate a repository from a directory containing EPKs.")
case "package":
fmt.Println("Usage: eternity package <epk>")
default:
fmt.Println("Usage: eternity help <build/generate/convert/repo/package>")
}
} else {
fmt.Println("Usage: eternity help <build/generate/convert/repo/package>")
}
}
}

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package common
import (
"crypto/ed25519"
"crypto/x509"
"encoding/pem"
"errors"
"eternity/lib"
"fmt"
"os"
"path/filepath"
"strings"
"github.com/fatih/color"
)
var DefaultLogger = lib.Logger{
LogFunc: func(log lib.Log) string {
var severityPretty string
switch log.Level {
case "INFO":
severityPretty = color.GreenString("[INFO]")
case "WARN":
severityPretty = color.YellowString("[WARN]")
case "ERROR":
severityPretty = color.HiYellowString("[ERROR]")
case "CRITICAL":
severityPretty = color.HiRedString("[CRITICAL]")
case "FATAL":
fmt.Println(color.RedString("[FATAL]"), log.Content)
os.Exit(1)
default:
severityPretty = color.WhiteString("[" + strings.ToUpper(log.Level) + "]")
}
fmt.Println(severityPretty, log.Content)
if log.Prompt {
fmt.Print(": ")
var userInput string
_, err := fmt.Scanln(&userInput)
if err != nil {
fmt.Println(color.RedString("[FATAL]"), "Failed to read user input:", err)
os.Exit(1)
} else {
return userInput
}
}
return ""
},
PromptSupported: true,
}
// EternityJsonHandleError handles errors related to the parsing of eternity.json
func EternityJsonHandleError(err error, vagueError error, logger *lib.Logger) {
switch {
case errors.Is(vagueError, lib.ErrEternityJsonOpenError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to open eternity.json: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, lib.ErrEternityJsonReadError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to reading eternity.json: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, lib.ErrEternityJsonParseError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to parse eternity.json: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, lib.ErrEternityJsonMapError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to map eternity.json: " + err.Error(),
Prompt: false,
})
}
}
// BuildEPKRemoveTemporaryDirectory removes the temporary directory created by BuildEPK
func BuildEPKRemoveTemporaryDirectory(tempDir string, logger *lib.Logger) {
err := os.RemoveAll(tempDir)
if err != nil {
logger.LogFunc(lib.Log{
Level: "ERROR",
Content: "Failed to cleanup temporary directory: " + err.Error(),
Prompt: false,
})
}
}
// BuildEPKHandleError handles errors related to the building of EPKs
func BuildEPKHandleError(tempDir string, err error, vagueError error, logger *lib.Logger) {
switch {
case errors.Is(vagueError, lib.ErrBuildEPKChrootError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Chroot containers are not yet supported",
Prompt: false,
})
case errors.Is(vagueError, lib.ErrBuildEPKUnrestrictedError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Unrestricted builds are not yet supported",
Prompt: false,
})
case errors.Is(vagueError, lib.ErrBuildEPKTemporaryDirectoryError):
BuildEPKRemoveTemporaryDirectory(tempDir, logger)
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to create temporary directory: " + err.Error(),
})
case errors.Is(vagueError, lib.ErrBuildEPKCreateHooksError):
BuildEPKRemoveTemporaryDirectory(tempDir, logger)
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to create hooks directory: " + err.Error(),
})
case errors.Is(vagueError, lib.ErrBuildEPKCopyHooksError):
BuildEPKRemoveTemporaryDirectory(tempDir, logger)
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to copy hooks: " + err.Error(),
})
case errors.Is(vagueError, lib.ErrBuildEPKBuildShError):
BuildEPKRemoveTemporaryDirectory(tempDir, logger)
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to create build.sh: " + err.Error(),
})
case errors.Is(vagueError, lib.ErrBuildEPKWritingBuildShError):
BuildEPKRemoveTemporaryDirectory(tempDir, logger)
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to write to build.sh: " + err.Error(),
})
case errors.Is(vagueError, lib.ErrBuildEPKTargetRootError):
BuildEPKRemoveTemporaryDirectory(tempDir, logger)
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to create target root: " + err.Error(),
})
case errors.Is(vagueError, lib.ErrBuildEPKExecutingBuildShError):
BuildEPKRemoveTemporaryDirectory(tempDir, logger)
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to start BubbleWrap container and run build.sh in it: " + err.Error(),
})
case errors.Is(vagueError, lib.ErrBuildEPKCountingFilesError):
BuildEPKRemoveTemporaryDirectory(tempDir, logger)
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to count files in target root: " + err.Error(),
})
}
}
// These errors are in the wrong order due to this function being rewritten.
// Oh well, not like it matters.
// PackageEPKHandleError handles errors related to the packaging of EPKs
func PackageEPKHandleError(err error, vagueError error, logger *lib.Logger) {
switch {
case errors.Is(vagueError, lib.ErrPackageEPKCreateDistDirError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to create dist directory: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, lib.ErrPackageEPKMoveToDistError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to move to dist directory: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, lib.ErrPackageEPKTarError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to create Tar archive: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, lib.ErrPackageEPKJSONMarshal):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to marshal JSON: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, lib.ErrPackageEPKCreateCompressionWriterError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to create compression writer: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, lib.ErrPackageEPKCompressCloseError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to close compression writer: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, lib.ErrPackageEPKCannotOpenFile):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to open file for writing: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, lib.ErrPackageEPKCannotWriteFile):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to write to file: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, lib.ErrPackageEPKCannotCloseFile):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to close file: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, lib.ErrPackageEPKFailedToSeek):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to move file cursor: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, lib.ErrPackageEPKFailedToWriteHash):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to generate hash: " + err.Error(),
Prompt: false,
})
}
}
var LoadPrivateKeyHomedirError = errors.New("failed to get home directory")
var LoadPrivateKeyReadError = errors.New("failed to read private key")
var LoadPrivateKeyGenerateError = errors.New("failed to generate private key")
var LoadPrivateKeyMarshalError = errors.New("failed to marshal private key")
var LoadPrivateKeyFolderCreateError = errors.New("failed to create folder")
var LoadPrivateKeyWriteError = errors.New("failed to write private key")
var LoadPrivateKeyEmptyBlockError = errors.New("blocks returned by pem.Decode are empty")
var LoadPrivateKeyParseError = errors.New("failed to parse private key")
var LoadPrivateKeyNotEd25519Error = errors.New("private key is not ed25519")
// LoadPrivateKey loads the private key from $HOME/.local/share/eternity/private.key
func LoadPrivateKey(logger *lib.Logger) (ed25519.PrivateKey, error, error) {
// Attempt to read the key from $HOME/.local/share/eternity/private.key
homeDir, err := os.UserHomeDir()
if err != nil {
return nil, err, LoadPrivateKeyHomedirError
}
privateKeyBytes, err := os.ReadFile(filepath.Join(homeDir, ".local/share/eternity/private.key"))
if err != nil {
if !os.IsNotExist(err) {
return nil, err, LoadPrivateKeyReadError
} else {
response := logger.LogFunc(lib.Log{
Level: "INFO",
Content: "You need to add a private key to sign EPKs. Would you like to generate one now? (y/n)",
Prompt: true,
})
if strings.ToLower(response) == "y" {
_, privateKey, err := ed25519.GenerateKey(nil)
if err != nil {
return nil, err, LoadPrivateKeyGenerateError
}
privateKeyBytes, err := x509.MarshalPKCS8PrivateKey(privateKey)
if err != nil {
return nil, err, LoadPrivateKeyMarshalError
}
privateKeyFile := pem.EncodeToMemory(&pem.Block{
Type: "ED25519 PRIVATE KEY",
Bytes: privateKeyBytes,
})
err = os.MkdirAll(filepath.Join(homeDir, ".local/share/eternity"), 0700)
if err != nil {
return nil, err, LoadPrivateKeyFolderCreateError
}
err = os.WriteFile(filepath.Join(homeDir, ".local/share/eternity/private.key"), privateKeyFile, 0600)
if err != nil {
return nil, err, LoadPrivateKeyWriteError
}
logger.LogFunc(lib.Log{
Level: "INFO",
Content: "Private key written to disk",
Prompt: false,
})
return privateKey, nil, nil
} else if strings.ToLower(response) == "n" {
logger.LogFunc(lib.Log{
Level: "INFO",
Content: "Understood. Please add a ed25519 private key to " + filepath.Join(homeDir, ".local/share/eternity/private.key") + " in order to sign EPKs and repositories",
Prompt: false,
})
os.Exit(1)
}
}
}
block, _ := pem.Decode(privateKeyBytes)
if block == nil {
return nil, nil, LoadPrivateKeyEmptyBlockError
}
privateKey, err := x509.ParsePKCS8PrivateKey(block.Bytes)
if err != nil {
return nil, err, LoadPrivateKeyParseError
}
ed25519PrivateKey, ok := privateKey.(ed25519.PrivateKey)
if !ok {
return nil, nil, LoadPrivateKeyNotEd25519Error
}
return ed25519PrivateKey, nil, nil
}
// LoadPrivateKeyHandleError handles errors related to LoadPrivateKey
func LoadPrivateKeyHandleError(err error, vagueError error, logger *lib.Logger) {
switch {
case errors.Is(vagueError, LoadPrivateKeyHomedirError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to get home directory: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, LoadPrivateKeyReadError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to read private key: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, LoadPrivateKeyGenerateError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to generate private key: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, LoadPrivateKeyMarshalError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to marshal private key: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, LoadPrivateKeyFolderCreateError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to create eternity config folder (are you missing permissions?): " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, LoadPrivateKeyWriteError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to write private key to disk: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, LoadPrivateKeyEmptyBlockError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Blocks returned by pem.Decode are empty",
Prompt: false,
})
case errors.Is(vagueError, LoadPrivateKeyParseError):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Failed to parse private key: " + err.Error(),
Prompt: false,
})
case errors.Is(vagueError, LoadPrivateKeyNotEd25519Error):
logger.LogFunc(lib.Log{
Level: "FATAL",
Content: "Private key is not a ed25519 key",
Prompt: false,
})
}
}

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epk-mime-type.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
<mime-type type="application/epk">
<comment>Eon Package</comment>
<glob pattern="*.epk"/>
<magic priority="50">
<match value="65706B" type="string" offset="0"/>
</magic>
</mime-type>
</mime-info>

16
go.mod Normal file
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module eternity
go 1.23
require (
github.com/Masterminds/semver v1.5.0
github.com/cespare/xxhash/v2 v2.3.0
github.com/fatih/color v1.17.0
github.com/klauspost/compress v1.17.9
)
require (
github.com/mattn/go-colorable v0.1.13 // indirect
github.com/mattn/go-isatty v0.0.20 // indirect
golang.org/x/sys v0.24.0 // indirect
)

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github.com/Masterminds/semver v1.5.0 h1:H65muMkzWKEuNDnfl9d70GUjFniHKHRbFPGBuZ3QEww=
github.com/Masterminds/semver v1.5.0/go.mod h1:MB6lktGJrhw8PrUyiEoblNEGEQ+RzHPF078ddwwvV3Y=
github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
github.com/fatih/color v1.17.0 h1:GlRw1BRJxkpqUCBKzKOw098ed57fEsKeNjpTe3cSjK4=
github.com/fatih/color v1.17.0/go.mod h1:YZ7TlrGPkiz6ku9fK3TLD/pl3CpsiFyu8N92HLgmosI=
github.com/klauspost/compress v1.17.9 h1:6KIumPrER1LHsvBVuDa0r5xaG0Es51mhhB9BQB2qeMA=
github.com/klauspost/compress v1.17.9/go.mod h1:Di0epgTjJY877eYKx5yC51cX2A2Vl2ibi7bDH9ttBbw=
github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.24.0 h1:Twjiwq9dn6R1fQcyiK+wQyHWfaz/BJB+YIpzU/Cv3Xg=
golang.org/x/sys v0.24.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

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package lib
import (
"archive/tar"
"bytes"
"crypto/ed25519"
"encoding/binary"
"encoding/json"
"errors"
"io"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"github.com/Masterminds/semver"
"github.com/cespare/xxhash/v2"
"github.com/klauspost/compress/zstd"
)
// SpecialFiles is a struct that contains the special files that are not to be deleted or replaced
type SpecialFiles struct {
NoDelete []string
NoReplace []string
}
// Metadata is a struct that contains the metadata of the package
type Metadata struct {
Name string
Description string
LongDescription string
Version semver.Version
Author string
License string
Architecture string
Dependencies []string
SpecialFiles SpecialFiles
}
// Build is a struct that contains the build configuration of the package
type Build struct {
Type string
Dependencies []string
Steps []string
TargetRoot string
HooksFolder PotentiallyNullString
FilesFolder PotentiallyNullString
}
// PotentiallyNullString is a struct that contains a string that may be null
type PotentiallyNullString struct {
Value string
Null bool
}
// Config is a struct that contains the configuration of the package
type Config struct {
Metadata Metadata
Build Build
}
// Log is a struct that contains the log information
type Log struct {
Level string
Content string
Prompt bool
}
// Logger is a struct that contains the functions and properties of the logger
type Logger struct {
LogFunc func(Log) string
PromptSupported bool
}
var ErrEternityJsonOpenError = errors.New("error opening eternity.json")
var ErrEternityJsonReadError = errors.New("error reading eternity.json")
var ErrEternityJsonParseError = errors.New("error parsing eternity.json")
var ErrEternityJsonMapError = errors.New("error mapping eternity.json")
// interfaceToStringSlice converts an interface slice to a string slice
func interfaceToStringSlice(interfaceSlice []interface{}, interfaceName string) ([]string, error) {
// Yes, it's meant to be empty and not nil: JSON arrays are empty, not nil
//goland:noinspection GoPreferNilSlice
stringSlice := []string{}
for _, interfaceValue := range interfaceSlice {
stringValue, ok := interfaceValue.(string)
if !ok {
return nil, errors.New(interfaceName + " are not strings")
}
stringSlice = append(stringSlice, stringValue)
}
return stringSlice, nil
}
// ParseConfig parses the eternity.json file
func ParseConfig(path string, logger *Logger) (Config, error, error) {
// Open eternity.json
logger.LogFunc(Log{
Level: "INFO",
Content: "Parsing eternity.json",
Prompt: false,
})
file, err := os.Open(path)
if err != nil {
return Config{}, err, ErrEternityJsonOpenError
}
// Convert the file to a byte buffer
var fileBytes bytes.Buffer
_, err = io.Copy(&fileBytes, file)
if err != nil {
return Config{}, err, ErrEternityJsonReadError
}
// Parse the file as JSON
var config map[string]interface{}
err = json.Unmarshal(fileBytes.Bytes(), &config)
if err != nil {
return Config{}, err, ErrEternityJsonParseError
}
// Map SpecialFiles
var parsedSpecialFiles SpecialFiles
specialFiles, ok := config["specialFiles"].(map[string]interface{})
if !ok {
return Config{}, errors.New("specialFiles is not an object"), ErrEternityJsonMapError
}
noDelete, ok := specialFiles["noDelete"].([]interface{})
if !ok {
return Config{}, errors.New("noDelete is not an array"), ErrEternityJsonMapError
}
parsedSpecialFiles.NoDelete, err = interfaceToStringSlice(noDelete, "noDelete")
if err != nil {
return Config{}, err, ErrEternityJsonMapError
}
noReplace, ok := specialFiles["noReplace"].([]interface{})
if !ok {
return Config{}, errors.New("noReplace is not an array"), ErrEternityJsonMapError
}
parsedSpecialFiles.NoReplace, err = interfaceToStringSlice(noReplace, "noReplace")
if err != nil {
return Config{}, err, ErrEternityJsonMapError
}
// Declare the parsedMetadata object
var parsedMetadata Metadata
// Append parsedSpecialFiles to parsedMetadata
parsedMetadata.SpecialFiles = parsedSpecialFiles
// Map the metadata
parsedMetadata.Name, ok = config["name"].(string)
if !ok {
return Config{}, errors.New("name is not a string"), ErrEternityJsonMapError
}
parsedMetadata.Description, ok = config["desc"].(string)
if !ok {
return Config{}, errors.New("description is not a string"), ErrEternityJsonMapError
}
parsedMetadata.LongDescription, ok = config["longDesc"].(string)
if !ok {
return Config{}, errors.New("longDesc is not a string"), ErrEternityJsonMapError
}
versionString, ok := config["version"].(string)
if !ok {
return Config{}, errors.New("version is not a string"), ErrEternityJsonMapError
}
versionPointer, err := semver.NewVersion(versionString)
if err != nil {
return Config{}, err, ErrEternityJsonMapError
}
parsedMetadata.Version = *versionPointer
parsedMetadata.Author, ok = config["author"].(string)
if !ok {
return Config{}, errors.New("author is not a string"), ErrEternityJsonMapError
}
parsedMetadata.License, ok = config["license"].(string)
if !ok {
return Config{}, errors.New("license is not a string"), ErrEternityJsonMapError
}
parsedMetadata.Architecture, ok = config["arch"].(string)
if !ok {
return Config{}, errors.New("arch is not a string"), ErrEternityJsonMapError
}
dependencies, ok := config["deps"].([]interface{})
if !ok {
return Config{}, errors.New("deps is not an array"), ErrEternityJsonMapError
}
parsedMetadata.Dependencies, err = interfaceToStringSlice(dependencies, "dependencies")
if err != nil {
return Config{}, err, ErrEternityJsonMapError
}
// Map build
var parsedBuild Build
build, ok := config["build"].(map[string]interface{})
if !ok {
return Config{}, errors.New("build is not an object"), ErrEternityJsonMapError
}
parsedBuild.Type, ok = build["type"].(string)
if !ok {
return Config{}, errors.New("type is not a string"), ErrEternityJsonMapError
}
buildDependencies, ok := build["deps"].([]interface{})
if !ok {
return Config{}, errors.New("deps is not an array"), ErrEternityJsonMapError
}
parsedBuild.Dependencies, err = interfaceToStringSlice(buildDependencies, "deps")
if err != nil {
return Config{}, err, ErrEternityJsonMapError
}
steps, ok := build["steps"].([]interface{})
if !ok {
return Config{}, errors.New("steps is not an array"), ErrEternityJsonMapError
}
parsedBuild.Steps, err = interfaceToStringSlice(steps, "steps")
if err != nil {
return Config{}, err, ErrEternityJsonMapError
}
parsedBuild.TargetRoot, ok = build["root"].(string)
if !ok {
return Config{}, errors.New("root is not a string"), ErrEternityJsonMapError
}
hooksFolder, ok := build["hooks"].(string)
if !ok {
parsedBuild.HooksFolder = PotentiallyNullString{Null: true}
} else {
parsedBuild.HooksFolder = PotentiallyNullString{Null: false, Value: hooksFolder}
}
filesFolder, ok := build["files"].(string)
if !ok {
parsedBuild.FilesFolder = PotentiallyNullString{Null: true}
} else {
parsedBuild.FilesFolder = PotentiallyNullString{Null: false, Value: filesFolder}
}
// Create the final Config object
parsedConfig := Config{
Metadata: parsedMetadata,
Build: parsedBuild,
}
// Return the final Config object
return parsedConfig, nil, nil
}
var ErrBuildEPKTemporaryDirectoryError = errors.New("error creating temporary directory")
var ErrBuildEPKCreateHooksError = errors.New("error creating hooks directory")
var ErrBuildEPKCopyHooksError = errors.New("error copying hooks")
var ErrBuildEPKChrootError = errors.New("chroot builds are not supported yet")
var ErrBuildEPKUnrestrictedError = errors.New("unrestricted builds are not supported yet")
var ErrBuildEPKBuildShError = errors.New("error creating build.sh")
var ErrBuildEPKWritingBuildShError = errors.New("error writing to build.sh")
var ErrBuildEPKTargetRootError = errors.New("error creating target root")
var ErrBuildEPKExecutingBuildShError = errors.New("error executing build.sh")
var ErrBuildEPKCountingFilesError = errors.New("error counting files")
// BuildEPK builds the EPK package into a build directory
func BuildEPK(projectDir string, inMemory bool, buildConfig Build, logger *Logger) (string, error, error) {
var tempDir string
switch buildConfig.Type {
case "chroot":
return "", nil, ErrBuildEPKChrootError
case "unrestricted":
return "", nil, ErrBuildEPKUnrestrictedError
case "host":
// Set up the temp dir
var err error
if inMemory {
// Builds in /tmp. This means that the program must fit in RAM. Luckily, most programs do.
// If you're building a large program, you might want to consider using a disk build.
tempDir, err = os.MkdirTemp("/tmp", "eternity-build-")
} else {
// Builds on disk. This is slower but if your program can't fit in RAM, you're out of luck.
// If your program can fit in RAM, you might want to consider using an in-memory build.
tempDir, err = os.MkdirTemp(projectDir, "eternity-build-")
}
if err != nil {
return tempDir, err, ErrBuildEPKTemporaryDirectoryError
}
// Copy the hooks folder
if buildConfig.HooksFolder.Null != true {
hooksDir := filepath.Join(projectDir, buildConfig.HooksFolder.Value)
targetHooksDir := filepath.Join(tempDir, buildConfig.HooksFolder.Value)
logger.LogFunc(Log{
Level: "INFO", Content: "Copying hooks from " + hooksDir + " to " + targetHooksDir, Prompt: false,
})
err = os.MkdirAll(targetHooksDir, 0755)
if err != nil {
return tempDir, err, ErrBuildEPKCreateHooksError
}
err = os.CopyFS(targetHooksDir, os.DirFS(hooksDir))
if err != nil {
return tempDir, err, ErrBuildEPKCopyHooksError
}
}
// Generate the shell script
logger.LogFunc(Log{
Level: "INFO", Content: "Generating shell script", Prompt: false,
})
// Create the shell script
shellScript := "#!/bin/sh\n"
for _, step := range buildConfig.Steps {
shellScript += step + "\n"
}
file, err := os.OpenFile(tempDir+"/build.sh", os.O_CREATE|os.O_RDWR, 0755)
if err != nil {
return tempDir, err, ErrBuildEPKBuildShError
}
_, err = file.WriteString(shellScript)
if err != nil {
return tempDir, err, ErrBuildEPKWritingBuildShError
}
// Set up the target root
targetRoot := filepath.Join(tempDir, buildConfig.TargetRoot)
err = os.MkdirAll(targetRoot, 0755)
if err != nil {
return tempDir, err, ErrBuildEPKTargetRootError
}
// Execute the shell script in BWrap
logger.LogFunc(Log{
Level: "INFO", Content: "Starting up container environment (replicating host files)", Prompt: false,
})
// Allow me to explain why it's in BWrap. It's very difficult to cut off internet access without root, so I just
// copy-pasted most of the host files into the container, then disabled networking. This also allows us to use
// fakeroot and minimises the blast radius of a malicious package (hopefully) by not allowing the home directory
// or any files owned by root to be viewed or modified (too bad if you've got sensitive data in /var or /etc :P)
arguments := []string{
"--unshare-net",
"--bind", "/bin", "/bin",
"--bind", "/lib", "/lib",
"--bind", "/lib64", "/lib64",
"--bind", "/usr", "/usr",
"--bind", "/etc", "/etc",
"--bind", "/var", "/var",
"--bind", "/sys", "/sys",
"--bind", "/opt", "/opt",
"--bind", targetRoot, filepath.Join("/", buildConfig.TargetRoot),
"--bind", tempDir, "/eternity",
"--dev", "/dev",
"--tmpfs", "/run",
"--tmpfs", "/tmp",
"--proc", "/proc",
"/usr/bin/fakeroot-tcp", "--",
"/bin/sh", "/eternity/build.sh",
}
if buildConfig.FilesFolder.Null != true {
arguments = arguments[:len(arguments)-4]
arguments = append(
arguments, "--bind", filepath.Join(projectDir, buildConfig.FilesFolder.Value), filepath.Join("/", buildConfig.FilesFolder.Value),
"/usr/bin/fakeroot-tcp", "--",
"/bin/sh", "/eternity/build.sh",
)
}
err = exec.Command("bwrap", arguments...).Run()
if err != nil {
return tempDir, err, ErrBuildEPKExecutingBuildShError
}
// Hopefully, the build was successful. Let's give the user a file count.
var fileCount int
// We start at -1 because the root directory is not counted
dirCount := -1
err = filepath.Walk(targetRoot, func(path string, info os.FileInfo, err error) error {
if info.IsDir() {
dirCount++
} else {
fileCount++
}
return nil
})
if err != nil {
return tempDir, err, ErrBuildEPKCountingFilesError
}
logger.LogFunc(Log{
Level: "INFO", Content: "Build successful. " + strconv.Itoa(fileCount) + " files and " + strconv.Itoa(dirCount) + " directories created.", Prompt: false,
})
}
return tempDir, nil, nil
}
// CreateTar creates a tar archive from a directory
func CreateTar(targetDir string, output io.Writer) error {
tarWriter := tar.NewWriter(output)
err := filepath.Walk(targetDir, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if !info.Mode().IsRegular() {
return nil
}
header, err := tar.FileInfoHeader(info, path)
if err != nil {
return err
}
header.Name = strings.TrimPrefix(strings.Replace(path, targetDir, "", -1), string(filepath.Separator))
err = tarWriter.WriteHeader(header)
if err != nil {
return err
}
file, err := os.Open(path)
if err != nil {
return err
}
_, err = io.Copy(tarWriter, file)
if err != nil {
return err
}
err = file.Close()
if err != nil {
return err
}
return nil
})
if err != nil {
return err
} else {
err = tarWriter.Close()
if err != nil {
return err
} else {
return nil
}
}
}
// These errors are in the wrong order due to this function being rewritten.
// Oh well, not like it matters.
// ConstPackageEPKMagicNumber is the magic number for an EPK file: "epk" in ASCII / UTF-8
var ConstPackageEPKMagicNumber = []byte{0x65, 0x70, 0x6B}
// ConstPackageEPKBigEndian is the letter "b" in ASCII / UTF-8
var ConstPackageEPKBigEndian = []byte{0x62}
// ConstPackageEPKLittleEndian is the letter "l" in ASCII / UTF-8
var ConstPackageEPKLittleEndian = []byte{0x6C}
// ConstPackageEPKInitialByteOffset is the initial byte offset for an EPK file until we arrive at the signature. 12 = 3 + 1 + 8: 3 for the magic number, 1 for the endian, and 8 for the tar offset
var ConstPackageEPKInitialByteOffset = 12
// SignatureLength is the length of the signature
var SignatureLength = 64
// PublicKeyLength is the length of the public key
var PublicKeyLength = 32
// ConstPackageEPKMetadataOffset is the offset of the metadata in the EPK file
var ConstPackageEPKMetadataOffset = 108
// All these errors are out of order once I rewrote this to stream instead of using a buffer.
// Oh well, not like it matters.
var ErrPackageEPKFailedToWriteHash = errors.New("error writing hash to EPK file")
var ErrPackageEPKFailedToSeek = errors.New("error seeking in EPK file")
var ErrPackageEPKCreateDistDirError = errors.New("error creating dist directory")
var ErrPackageEPKMoveToDistError = errors.New("error moving to dist directory")
var ErrPackageEPKTarError = errors.New("error creating tar")
var ErrPackageEPKJSONMarshal = errors.New("error marshalling JSON")
var ErrPackageEPKCreateCompressionWriterError = errors.New("error creating ZStandard writer")
var ErrPackageEPKCompressCloseError = errors.New("error closing EPK ZStandard writer")
var ErrPackageEPKCannotOpenFile = errors.New("error opening EPK file for writing")
var ErrPackageEPKCannotWriteFile = errors.New("error writing to EPK file")
var ErrPackageEPKCannotCloseFile = errors.New("error closing EPK file")
// PackageEPK packages the EPK work directory into an EPK file
func PackageEPK(metaData Metadata, build Build, tempDir string, output string, privateKey ed25519.PrivateKey, logger *Logger) (error, error) {
// Create the EPK
logger.LogFunc(Log{
Level: "INFO", Content: "Packaging EPK", Prompt: false,
})
// Ok. Let's construct targetDir, then hooksDir
targetDir := filepath.Join(tempDir, build.TargetRoot)
distDir := tempDir + "/dist"
err := os.MkdirAll(distDir, 0755)
if err != nil {
return err, ErrPackageEPKCreateDistDirError
}
err = os.Rename(targetDir, distDir+"/root")
if err != nil {
return err, ErrPackageEPKMoveToDistError
}
if build.HooksFolder.Null != true {
hooksDir := filepath.Join(tempDir, build.HooksFolder.Value)
err = os.Rename(hooksDir, distDir+"/hooks")
if err != nil {
return err, ErrPackageEPKMoveToDistError
}
}
// Map the metadata to a JSON string
logger.LogFunc(Log{
Level: "INFO", Content: "Calculating package metadata", Prompt: false,
})
dataTemplate := map[string]interface{}{
"name": metaData.Name,
"author": metaData.Author,
"version": metaData.Version.String(),
"desc": metaData.Description,
"longDesc": metaData.LongDescription,
"license": metaData.License,
"arch": metaData.Architecture,
"deps": metaData.Dependencies,
"specialFiles": map[string][]string{
"noDelete": metaData.SpecialFiles.NoDelete,
"noReplace": metaData.SpecialFiles.NoReplace,
},
}
// Make the data template into a JSON string
dataTemplateBytes, err := json.Marshal(dataTemplate)
if err != nil {
return err, ErrPackageEPKJSONMarshal
}
// Calculate the offsets
logger.LogFunc(Log{
Level: "INFO", Content: "Calculating binary offsets", Prompt: false,
})
// Calculate the length of the data template
var dataTemplateLength int64
for range dataTemplateBytes {
dataTemplateLength++
}
// Calculate the tar offset
var tarOffset int64
tarOffset = int64(ConstPackageEPKMetadataOffset) + dataTemplateLength
logger.LogFunc(Log{
Level: "INFO", Content: "Calculating binary properties", Prompt: false,
})
// We need to determine the endianness of the architecture so that it's optimal for the target system
// We assume little-endian by default because most architectures are little-endian (why would you use big-endian?)
littleEndian := true
switch metaData.Architecture {
case "ppc64":
littleEndian = false
case "ppc":
littleEndian = false
case "mips64":
littleEndian = false
case "mips":
littleEndian = false
case "s390":
littleEndian = false
case "s390x":
littleEndian = false
case "sparc64":
littleEndian = false
case "sparc":
littleEndian = false
default:
littleEndian = true
}
// Create the byte arrays for the tar offset
tarOffsetBytes := make([]byte, 8)
// Write as much as we can to the file
logger.LogFunc(Log{
Level: "INFO", Content: "Writing to file", Prompt: false,
})
// Open the file buffer
file, err := os.OpenFile(output, os.O_CREATE|os.O_RDWR|os.O_TRUNC, 0644)
if err != nil {
return err, ErrPackageEPKCannotOpenFile
}
// Write the magic number
_, err = file.Write(ConstPackageEPKMagicNumber)
if err != nil {
return err, ErrPackageEPKCannotWriteFile
}
// Write the endianness and correct the offsets based on the endianness
// I know it's wasteful to convert an int64 to an uint64, but binary doesn't support int64 with custom Endian-ness
// and file.Seek doesn't
// support uint64.
if littleEndian {
binary.LittleEndian.PutUint64(tarOffsetBytes, uint64(tarOffset))
_, err = file.Write(ConstPackageEPKLittleEndian)
} else {
binary.BigEndian.PutUint64(tarOffsetBytes, uint64(tarOffset))
_, err = file.Write(ConstPackageEPKBigEndian)
}
if err != nil {
return err, ErrPackageEPKCannotWriteFile
}
_, err = file.Write(tarOffsetBytes)
if err != nil {
return err, ErrPackageEPKCannotWriteFile
}
_, err = file.WriteAt(dataTemplateBytes, int64(ConstPackageEPKMetadataOffset))
if err != nil {
return err, ErrPackageEPKCannotWriteFile
}
// Create the tar archive
logger.LogFunc(Log{
Level: "INFO", Content: "Creating tar", Prompt: false,
})
// Move the file pointer to the tar offset so that we can write the tar archive
seek, err := file.Seek(tarOffset, io.SeekStart)
if err != nil {
return err, ErrPackageEPKFailedToSeek
}
if seek != tarOffset {
return err, ErrPackageEPKFailedToSeek
}
// Create the hash writer
sha512Hash := xxhash.New()
_, err = sha512Hash.Write(dataTemplateBytes)
if err != nil {
return err, nil
}
// Create a multi-writer so we can write to the file and the hash at the same time
multiWriter := io.MultiWriter(file, sha512Hash)
// Create the ZStandard writer
writer, err := zstd.NewWriter(multiWriter, zstd.WithEncoderLevel(zstd.SpeedDefault))
if err != nil {
return err, ErrPackageEPKCreateCompressionWriterError
}
// We start writing the tar archive
err = CreateTar(distDir, writer)
if err != nil {
return err, ErrPackageEPKTarError
}
// Close the ZStandard writer
err = writer.Close()
if err != nil {
return err, ErrPackageEPKCompressCloseError
}
// Great, let's sign the EPK
logger.LogFunc(Log{
Level: "INFO", Content: "Signing EPK", Prompt: false,
})
// Sign the hash
signature := ed25519.Sign(privateKey, sha512Hash.Sum(nil))
publicKey := privateKey.Public().(ed25519.PublicKey)
// Write the signature and public key to the file
// Reverse the pointer back to the start of the file so our offsets are correct
_, err = file.Seek(0, io.SeekStart)
if err != nil {
return err, ErrPackageEPKFailedToSeek
}
// Write the signature
_, err = file.WriteAt(signature, int64(ConstPackageEPKInitialByteOffset))
if err != nil {
return err, ErrPackageEPKCannotWriteFile
}
// Write the public key
_, err = file.WriteAt(publicKey, int64(ConstPackageEPKInitialByteOffset)+int64(SignatureLength))
if err != nil {
return err, ErrPackageEPKCannotWriteFile
}
// Close the file
err = file.Close()
if err != nil {
return err, ErrPackageEPKCannotCloseFile
}
return nil, nil
}