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package main
import (
"log"
"os"
"os/exec"
"github.com/pwaller/goupx/hemfix"
)
const usageText = `usage: goupx [args...] files...
--no-upx: Disables UPX from running.
--strip-binary: Strips binaries before compressing them.
See UPX's documentation (man upx) for information on UPX's flags.
`
var run_strip = false
var run_upx = true
var upxPath string
// usage prints some nice output instead of panic stacktrace when an user calls
// goupx without arguments
func usage() {
os.Stderr.WriteString(usageText)
}
// findUpxBinary searches for the upx binary in PATH.
func findUpxBinary() {
var err error
upxPath, err = exec.LookPath("upx")
if err != nil {
log.Fatal("Couldn't find upx binary in PATH")
}
}
// parseArguments parses arguments from os.Args and separates the goupx flags
// from the UPX flags, as well as separating the files from the arguments.
func parseArguments() (args []string, files []string) {
if len(os.Args) == 1 {
usage()
}
args = append(args, upxPath)
for _, arg := range os.Args[1:] {
switch {
case arg == "-h" || arg == "--help":
usage()
case arg == "--no-upx":
run_upx = false
case arg == "--strip-binary":
run_strip = true
case arg[0] != '-':
files = append(files, arg)
default:
args = append(args, arg)
}
}
return
}
// compressBinary attempts to compress the binary with UPX.
func compressBinary(input_file string, arguments []string) {
if run_upx {
cmd := &exec.Cmd{
Path: upxPath,
Args: append(arguments, input_file),
}
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
log.Panic("upx failed: ", err)
}
}
}
// stripBinary attempts to strip the binary.
func stripBinary(input_file string) {
if run_strip {
cmd := exec.Command("strip", "-s", input_file)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
log.Panic("strip failed: ", err)
}
}
}
// runHemfix will attempt to fix the current input file.
func runHemfix(input_file string) {
if err := hemfix.FixFile(input_file); err != nil {
log.Panicf("Failed to fix '%s': %v", input_file, err)
}
log.Print("File fixed!")
}
func main() {
findUpxBinary()
arguments, files := parseArguments()
for _, file := range files {
runHemfix(file)
stripBinary(file)
compressBinary(file, arguments)
}
if err := recover(); err != nil {
log.Print("Panicked. Giving up.")
panic(err)
return
}
}
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