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main.go
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main.go
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package main
import (
"errors"
"fmt"
"io"
"log"
"os"
)
var errUsage = errors.New("usage error")
var errRun = errors.New("run error")
func main() {
log.SetFlags(log.Ltime | log.Lshortfile)
err := _main()
switch {
case err == nil:
os.Exit(0)
case errors.Is(err, errUsage):
os.Exit(2)
case errors.Is(err, errRun):
os.Exit(1)
default:
os.Exit(3)
}
}
func _main() error {
cli, fs := NewCLI()
if err := fs.Parse(os.Args[1:]); err != nil {
log.Println("invalid arguments")
fs.Usage()
return errUsage
}
cli.Inputs = fs.Args()
fsys := os.DirFS(".")
if err := assertValidInputs(fsys, cli.Inputs); err != nil {
log.Printf("invalid inputs: %s", err)
fs.Usage()
return fmt.Errorf("assertValidInputs: %w", errRun)
}
if err := assertValidOutput(fsys, cli); err != nil {
log.Printf("invalid output: %s", err)
fs.Usage()
return errUsage
}
log.Printf("building universal binary from %q", cli.Inputs)
rdc, err := run(fsys, cli)
if err != nil {
log.Printf("failed to build: %s", err)
return errRun
}
defer rdc.Close()
outputName := cli.GetOutputName()
log.Printf("writing output to %q", outputName)
output, err := os.OpenFile(cli.GetOutputName(), os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0o0755)
if err != nil {
log.Printf("failed to write output file: %s", err)
return errRun
}
defer output.Close()
io.Copy(output, rdc)
return nil
}