File Remove-signatures-from-Docker-images.patch of Package apptainer

From: Egbert Eich <eich@suse.com>
Date: Wed Mar 13 17:41:43 2024 +0100
Subject: Remove signatures from Docker images
Patch-mainline: Not yet
Git-repo: https://github.com/apptainer/apptainer
Git-commit: eb17f79efd7c2fc1a5bacbca3743b71f0a659355
References: bsc#1221364

OCI image layouts do not support the storing of signatures.
Therefore, singed containers will cause apptainer to error
on ``apptainer build ..``
with the message:
 "Pushing signatures for OCI images is not supported" when
attempting to pull signed containers from a Docker registry.
To fix this, set an option to remove signatures.

This fixes issue #2094.

Signed-off-by: Egbert Eich <eich@suse.com>
Signed-off-by: Egbert Eich <eich@suse.de>
---
 internal/pkg/build/oci/oci.go                    | 5 +++--
 internal/pkg/build/sources/conveyorPacker_oci.go | 5 +++--
 3 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/CHANGELOG.md b/CHANGELOG.md
index edcddd3a3..d0c609053 100644
diff --git a/internal/pkg/build/oci/oci.go b/internal/pkg/build/oci/oci.go
index 68e6f5989..46665917a 100644
--- a/internal/pkg/build/oci/oci.go
+++ b/internal/pkg/build/oci/oci.go
@@ -125,8 +125,9 @@ func (t *ImageReference) newImageSource(ctx context.Context, sys *types.SystemCo
 
 	// First we are fetching into the cache
 	_, err = copy.Image(ctx, policyCtx, t.ImageReference, t.source, &copy.Options{
-		ReportWriter: w,
-		SourceCtx:    sys,
+		ReportWriter:     w,
+		SourceCtx:        sys,
+		RemoveSignatures: true,
 	})
 	if err != nil {
 		return nil, err
diff --git a/internal/pkg/build/sources/conveyorPacker_oci.go b/internal/pkg/build/sources/conveyorPacker_oci.go
index f4107da63..14a545a53 100644
--- a/internal/pkg/build/sources/conveyorPacker_oci.go
+++ b/internal/pkg/build/sources/conveyorPacker_oci.go
@@ -301,8 +301,9 @@ func (cp *OCIConveyorPacker) Pack(ctx context.Context) (*sytypes.Bundle, error)
 func (cp *OCIConveyorPacker) fetch(ctx context.Context) error {
 	// cp.srcRef contains the cache source reference
 	_, err := copy.Image(ctx, cp.policyCtx, cp.tmpfsRef, cp.srcRef, &copy.Options{
-		ReportWriter: io.Discard,
-		SourceCtx:    cp.sysCtx,
+		ReportWriter:     io.Discard,
+		SourceCtx:        cp.sysCtx,
+		RemoveSignatures: true,
 	})
 	return err
 }