| // Copyright 2023 The Shac 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 shac is shac's CLI executable. |
| package main |
| |
| import ( |
| "context" |
| "errors" |
| "fmt" |
| "os" |
| "os/signal" |
| "runtime/pprof" |
| "syscall" |
| |
| "github.com/mattn/go-isatty" |
| flag "github.com/spf13/pflag" |
| "go.fuchsia.dev/shac-project/shac/internal/cli" |
| "go.fuchsia.dev/shac-project/shac/internal/engine" |
| ) |
| |
| func main() { |
| signalChannel := make(chan os.Signal, 2) |
| signal.Notify(signalChannel, syscall.SIGTERM, syscall.SIGINT) |
| ctx, cancel := context.WithCancel(context.Background()) |
| go func() { |
| sig := <-signalChannel |
| cancel() |
| // Print a goroutine stacktrace only on SIGTERM - we only want to see a |
| // stack trace when shac gets canceled by automation, which may indicate |
| // a timeout due to a hang. If shac gets Ctrl-C'd (SIGINT) by a human |
| // user it's not helpful to print a stacktrace. |
| if sig == syscall.SIGTERM { |
| _ = pprof.Lookup("goroutine").WriteTo(os.Stderr, 1) |
| } |
| }() |
| |
| if err := cli.Main(ctx, os.Args); err != nil && !errors.Is(err, flag.ErrHelp) { |
| var stackerr engine.BacktraceableError |
| if errors.As(err, &stackerr) { |
| _, _ = os.Stderr.WriteString(stackerr.Backtrace()) |
| } |
| // If stderr is not a terminal, always print the error. |
| // |
| // If stderr is a terminal: |
| // - If a check failed, appropriate information should have already been |
| // emitted by the reporter. |
| // - A context cancellation will likely be because the user Ctrl-C'd |
| // shac, so the exit will be expected and there's no need to print |
| // anything. |
| if !isatty.IsTerminal(os.Stderr.Fd()) || |
| (!errors.Is(err, engine.ErrCheckFailed) && !errors.Is(err, context.Canceled)) { |
| _, _ = fmt.Fprintf(os.Stderr, "shac: %s\n", err) |
| } |
| os.Exit(1) |
| } |
| } |