Add convenience wrappers to shell out to any binary in Go

https://github.com/containers/toolbox/pull/318

src/go.mod

@@ -1,3 +1,5 @@
 module github.com/containers/toolbox
 
 go 1.13
+
+require github.com/sirupsen/logrus v1.5.0

src/go.sum

@@ -0,0 +1,12 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=
+github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/sirupsen/logrus v1.5.0 h1:1N5EYkVAPEywqZRJd7cwnRtCb6xJx7NH3T3WUTF980Q=
+github.com/sirupsen/logrus v1.5.0/go.mod h1:+F7Ogzej0PZc/94MaYx/nvG9jOFMD2osvC3s+Squfpo=
+github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894 h1:Cz4ceDQGXuKRnVBDTS23GTn/pU5OE2C0WrNTOYK1Uuc=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

src/meson.build

@@ -4,6 +4,7 @@ go_build_wrapper_program = find_program('go-build-wrapper')
 sources = files(
   'toolbox.go',
   'cmd/root.go',
+  'pkg/shell/shell.go',
   'pkg/version/version.go',
 )
 

src/pkg/shell/shell.go

@@ -0,0 +1,68 @@
+/*
+ * Copyright © 2019 – 2020 Red Hat Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package shell
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+
+	"github.com/sirupsen/logrus"
+)
+
+func Run(name string, stdin io.Reader, stdout, stderr io.Writer, arg ...string) error {
+	exitCode, err := RunWithExitCode(name, stdin, stdout, stderr, arg...)
+	if exitCode != 0 && err == nil {
+		err = fmt.Errorf("failed to invoke %s(1)", name)
+	}
+
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func RunWithExitCode(name string, stdin io.Reader, stdout, stderr io.Writer, arg ...string) (int, error) {
+	logLevel := logrus.GetLevel()
+	if stderr == nil && logLevel >= logrus.DebugLevel {
+		stderr = os.Stderr
+	}
+
+	cmd := exec.Command(name, arg...)
+	cmd.Stdin = stdin
+	cmd.Stdout = stdout
+	cmd.Stderr = stderr
+
+	if err := cmd.Run(); err != nil {
+		if errors.Is(err, exec.ErrNotFound) {
+			return 1, fmt.Errorf("%s(1) not found", name)
+		}
+
+		var exitErr *exec.ExitError
+		if errors.As(err, &exitErr) {
+			exitCode := exitErr.ExitCode()
+			return exitCode, nil
+		}
+
+		return 1, fmt.Errorf("failed to invoke %s(1)", name)
+	}
+
+	return 0, nil
+}