/
support.go
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/
support.go
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// Copyright 2017 The LUCI Authors.
//
// 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 application
import (
"context"
"fmt"
"os"
"github.com/TriggerMail/luci-go/common/errors"
"github.com/TriggerMail/luci-go/vpython"
)
// returnCodeError is an error wrapping a return code value.
type returnCodeError int
func (err returnCodeError) Error() string {
return fmt.Sprintf("python interpreter returned non-zero error: %d", err)
}
var appKey = "github.com/TriggerMail/luci-go/vpython/application.A"
func withApplication(c context.Context, a *application) context.Context {
return context.WithValue(c, &appKey, a)
}
func getApplication(c context.Context, args []string) *application {
a := c.Value(&appKey).(*application)
a.args = args
return a
}
func run(c context.Context, fn func(context.Context) error) int {
err := fn(c)
switch t := errors.Unwrap(err).(type) {
case nil:
return 0
case returnCodeError:
return int(t)
default:
// If the error is tagged as a UserError, just print it without the scary
// stack trace.
if vpython.IsUserError.In(err) {
executable, eErr := os.Executable()
if eErr != nil {
executable = "<unknown executable>"
}
fmt.Fprintf(os.Stderr, "%s: %s\n", executable, err)
} else {
errors.Log(c, err)
}
return 1
}
}