tools: add gen-manifest helper

Add a `gen-manifests` helper that creates mock manifests from
the given image type. Its not perfect mocks as it still will
look into the bootc ref (centos9).

Its not generating checksums only because to compare from the
manifests generated by bib and images its easier to work with
full manifests and we only have very few of them in bib.

Author: mvo5

tools/gen-manifests

@@ -0,0 +1,52 @@
+#!/usr/bin/bash
+#
+# Generates mock manifests (i.e. without real resolved content)
+# XXX: copied from the images library, this is temporary until
+# all image manifest generation for bib moves into "images" itself.
+
+set -euo pipefail
+
+tmpdir="$(mktemp -d)"
+cleanup() {
+    rm -r "${tmpdir}"
+}
+trap cleanup EXIT
+
+manifests_dir="${1:-}"
+if [ "$manifests_dir" = "" ]; then
+    echo "need a manifests dir as first argument"
+    exit 1
+fi
+mkdir -p "$manifests_dir"
+
+export OSBUILD_TESTING_RNG_SEED=0
+export IMAGE_BUILDER_EXPERIMENTAL=bib-mock-resolvers
+
+echo "Checking if bib compiles"
+if ! (cd bib && go build -v -o "${tmpdir}/bin/" ./cmd/bootc-image-builder); then
+    echo "Failed to compile bootc-image-builder. Skipping..."
+    exit 0
+fi
+
+echo "Generating mock manifests"
+# XXX: we look into the image so we need a real bootc container available,
+# this is not ideal and may invalidate the whole approach
+BOOTC_REF="quay.io/centos-bootc/centos-bootc:stream9"
+podman pull "$BOOTC_REF"
+# XXX: more arches?
+for arch in x86_64 aarch64; do
+    # XXX: add anaconda-iso once we can mock it too
+    for imgtype in ami qcow2 vmdk raw vhd gce; do
+	if ! "${tmpdir}/bin/bootc-image-builder" \
+	     manifest -v "$BOOTC_REF" \
+	     --target-arch "$arch" \
+	     --type "$imgtype" \
+	     2> "${tmpdir}/stderr" \
+	     | jq > "$manifests_dir/manifest-$arch-$imgtype.json"; then
+	    cat "${tmpdir}/stderr"
+	    exit 1
+	fi
+    done
+done
+
+echo "Manifests saved to ${manifests_dir}"