Hide pacman output when setting install reason

Stderr is shown if Pacman returns non 0.

cmd.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"bufio"
+	"bytes"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -692,6 +693,38 @@ func passToPacman(args *arguments) error {
 	return err
 }
 
+//passToPacman but return the output instead of showing the user
+func passToPacmanCapture(args *arguments) (string, string, error) {
+	var outbuf, errbuf bytes.Buffer
+	var cmd *exec.Cmd
+	argArr := make([]string, 0)
+
+	if args.needRoot() {
+		argArr = append(argArr, "sudo")
+	}
+
+	argArr = append(argArr, config.PacmanBin)
+	argArr = append(argArr, cmdArgs.formatGlobals()...)
+	argArr = append(argArr, args.formatArgs()...)
+	if config.NoConfirm {
+		argArr = append(argArr, "--noconfirm")
+	}
+
+	argArr = append(argArr, "--")
+
+	argArr = append(argArr, args.formatTargets()...)
+
+	cmd = exec.Command(argArr[0], argArr[1:]...)
+	cmd.Stdout = &outbuf
+	cmd.Stderr = &errbuf
+
+	err := cmd.Run()
+	stdout := outbuf.String()
+	stderr := errbuf.String()
+
+	return stdout, stderr, err
+}
+
 // passToMakepkg outsources execution to makepkg binary without modifications.
 func passToMakepkg(dir string, args ...string) (err error) {
 

install.go

@@ -137,9 +137,9 @@ func install(parser *arguments) error {
 		}
 
 		if len(depArguments.targets) > 0 {
-			err = passToPacman(depArguments)
+			_, stderr, err := passToPacmanCapture(depArguments)
 			if err != nil {
-				return err
+				return fmt.Errorf("%s%s", stderr, err)
 			}
 		}
 	}
@@ -495,9 +495,9 @@ func buildInstallPkgBuilds(pkgs []*rpc.Pkg, srcinfos map[string]*gopkg.PKGBUILD,
 
 		updateVSCdb(bases[pkg.PackageBase], srcinfo)
 		if len(depArguments.targets) > 0 {
-			err = passToPacman(depArguments)
+			_, stderr, err := passToPacmanCapture(depArguments)
 			if err != nil {
-				return err
+				return fmt.Errorf("%s%s", stderr, err)
 			}
 		}
 		config.NoConfirm = oldConfirm