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pkg/bindings/images.Build(): fix a race condition in error reporting

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In nTar(), don't return the error value when the goroutine that's
populating the error value can continue running long after nTar()
returns.  Instead, wrap the Close() method of the pipe that we're
returning in a function that collects those errors, along with any error
we get from closing the pipe, and returns them from Close() wrapper.

In Build(), if the Close() method returns an error, at least log it.

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>
This commit is contained in:
Nalin Dahyabhai
2021-03-15 12:03:22 -04:00
parent 604459b404
commit e8918ff10b
1 changed files with 15 additions and 3 deletions
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18
pkg/bindings/images/build.go
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@ -20,6 +20,7 @@ import (
"github.com/containers/podman/v3/pkg/bindings"
"github.com/containers/podman/v3/pkg/domain/entities"
"github.com/containers/storage/pkg/fileutils"
"github.com/containers/storage/pkg/ioutils"
"github.com/docker/go-units"
"github.com/hashicorp/go-multierror"
jsoniter "github.com/json-iterator/go"
@ -252,7 +253,11 @@ func Build(ctx context.Context, containerFiles []string, options entities.BuildO
logrus.Errorf("cannot tar container entries %v error: %v", entries, err)
return nil, err
}
defer tarfile.Close()
defer func() {
if err := tarfile.Close(); err != nil {
logrus.Errorf("%v\n", err)
}
}()
containerFile, err := filepath.Abs(entries[0])
if err != nil {
@ -340,7 +345,7 @@ func nTar(excludes []string, sources ...string) (io.ReadCloser, error) {
gw := gzip.NewWriter(pw)
tw := tar.NewWriter(gw)
var merr error
var merr *multierror.Error
go func() {
defer pw.Close()
defer gw.Close()
@ -421,7 +426,14 @@ func nTar(excludes []string, sources ...string) (io.ReadCloser, error) {
merr = multierror.Append(merr, err)
}
}()
return pr, merr
rc := ioutils.NewReadCloserWrapper(pr, func() error {
if merr != nil {
merr = multierror.Append(merr, pr.Close())
return merr.ErrorOrNil()
}
return pr.Close()
})
return rc, nil
}
func parseDockerignore(root string) ([]string, error) {