Wrapper written in Go designed for package managers to unify software management commands between distros
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/*
Pak: Wrapper designed for package managers to unify software management commands between distros
Copyright (C) 2020 Arsen Musayelyan
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
"fmt"
"github.com/alessio/shellescape"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
flag "github.com/spf13/pflag"
"os"
"os/exec"
"os/user"
"strings"
)
var Log = log.Output(zerolog.ConsoleWriter{Out: os.Stderr})
func main() {
// Create help flag
helpFlagGiven := flag.BoolP("help", "h", false, "Show help screen")
// Create package manager override flag
packageManagerOverride := flag.StringP("package-manager", "p", os.Getenv("PAK_MGR_OVERRIDE"), "Override package manager wrapped by pak")
// Parse arguments for flags
flag.Parse()
// Check which user is running command
currentUser, err := user.Current()
if err != nil {
Log.Fatal().Err(err).Msg("Error getting current user")
}
// If running as root
if strings.Contains(currentUser.Username, "root") {
// Print warning message
Log.Warn().Msg("Running as root may cause extraneous root invocation")
}
// Get arguments without flags
args := flag.Args()
// Define variables for config file location, and override state boolean
var isOverridden bool
// Read /etc/pak.toml into new Config{}
config := NewConfig("/etc/pak.toml")
// If override is set
if *packageManagerOverride != "" {
// Set active package manager to override
config.ActiveManager = *packageManagerOverride
// Set override state to true
isOverridden = true
} else {
// Set override state to false
isOverridden = false
}
// Parse list of commands in config line 2 and set to variable as array
commands := config.Managers[config.ActiveManager].Commands
//fmt.Println(commands) //DEBUG
// Set the root option in config line 3 to a variable
useRoot := config.Managers[config.ActiveManager].UseRoot
//fmt.Println(useRoot) //DEBUG
// Set command to use to invoke root at config line 4 to a variable
rootCommand := config.RootCommand
//fmt.Println(rootCommand) //DEBUG
// Parse list of shortcuts in config and line 5 set to variable as an array
shortcuts := config.Managers[config.ActiveManager].Shortcuts
//fmt.Println(shortcuts) //DEBUG
// Create similar to slice to put all matched commands into
similarTo := []string{}
// Displays help message if no arguments provided or -h/--help is passed
if len(args) == 0 || *helpFlagGiven || Contains(args, "help") {
printHelpMessage(config.ActiveManager, rootCommand, commands, shortcuts, useRoot, isOverridden)
os.Exit(0)
}
// Create distance slice to store JaroWinkler distance values
distance := map[string]float64{}
// Appends JaroWinkler distance between each available command and the first argument to an array
for command := range commands {
distance[command] = JaroWinkler(command, args[0], 1, 0)
}
// Deals with shortcuts
for shortcut, mapping := range shortcuts {
// If the first argument is a shortcut and similarTo does not already contain its mapping, append it
if args[0] == shortcut && !Contains(similarTo, mapping) {
similarTo = append(similarTo, mapping)
}
}
// Compares each distance to the max of the distance slice and appends the closest command to similarTo
for command, cmdDist := range distance {
// If current element is the closest to the first argument
if cmdDist == Max(GetValuesDist(distance)) {
// Append command at same index as distance to similarTo
similarTo = append(similarTo, commands[command])
}
}
// If similarTo is still empty, log it fatally as something is wrong with the config or the code
if len(similarTo) == 0 {
Log.Fatal().Msg("This command does not match any known commands or shortcuts")
}
var overriddenStr string
if isOverridden {
overriddenStr = "(overridden)"
} else {
overriddenStr = ""
}
// Print text showing command being run and package manager being used
fmt.Println("Running:", strings.Title(GetKey(commands, similarTo[0])), "using", strings.Title(config.ActiveManager), overriddenStr)
// Run package manager with the proper arguments passed if more than one argument exists
var cmdArr []string
// If root is to be used, append it to cmdArr
if useRoot {
cmdArr = append(cmdArr, rootCommand)
}
// If command to be run has a prefix of "cmd:"
if strings.HasPrefix(similarTo[0], "cmd:") {
// Append the command to the slice without the prefix
cmdArr = append(cmdArr, strings.TrimPrefix(similarTo[0], "cmd:"))
} else {
// Otherwise, append all commands and arguments for the package manager to slice
cmdArr = append(cmdArr, config.ActiveManager, similarTo[0])
}
// If greater than 2 arguments, append them to cmdArr
if len(args) >= 2 {
cmdArr = append(cmdArr, shellescape.QuoteCommand(args[1:]))
}
// Create space separated string from cmdArr
cmdStr := strings.Join(cmdArr, " ")
// Instantiate exec.Command object with command sh, flag -c, and cmdStr
command := exec.Command("sh", "-c", cmdStr)
// Set standard outputs for command
command.Stdout = os.Stdout
command.Stdin = os.Stdin
command.Stderr = os.Stderr
// Run command
err = command.Run()
// If command returned an error, log fatally with explanation
if err != nil {
Log.Fatal().Err(err).Msg("Error received from child process")
}
}