marsh patio
I have an action that I am running in a dagger container that generates an error report on failure. I need the report in order to resolve the failure, but I cannot get the report out of the container using Export() because of the failed status code from the shell command.
Is there a way to resolve this?
paper stream
@marsh patio you can ignore the error by wrapping the call in a shell and || true it's output until we provide a better API for that here: https://github.com/dagger/dagger/issues/3192
i.e:
package main
import (
"context"
"fmt"
"dagger.io/dagger"
)
func main() {
c, err := dagger.Connect(context.Background())
if err != nil {
panic(err)
}
defer c.Close()
ctx := context.Background()
ok, err := c.Container().From("alpine").
WithExec([]string{"sh", "-c", "(echo hello > foo.txt && exit 1) || true"}).
FS().
Export(ctx, "./out")
fmt.Println(ok, err)
}
I see. I got the export working, but I needed the error to fail the process. I made a workaround by sending the command stderr and the command exit code to a file. I have a function that can inspect the exit code and detect non-zero that will throw an error and read the stderr file to report back to the terminal.
I think this will work for now
func WithTrapExec(container *dagger.Container, cmd []string) (*dagger.Container, error) {
container = container.WithExec(
[]string{"/bin/sh", "-c", fmt.Sprintf("%s > /tmp/stderr 2>&1 || echo $? > /tmp/code", strings.Join(cmd, " "))},
)
ctx := context.Background()
code, err := container.File("/tmp/code").Contents(ctx)
if err != nil {
// if the command succeeds /tmp/code will not be created
if strings.Contains(err.Error(), "no such file or directory") {
return container, nil
}
return container, err
}
if code != "0" {
stderr, err := container.File("/tmp/stderr").Contents(ctx)
if err != nil {
return container, err
}
return container, errors.New(stderr)
}
return container, nil
}