cvm-image-rewriter: add 07-install-mvp-guest (#182)

This unit requires the environment variable CVM_MVP_GUEST_REPO.
It will copy the local repo CVM_MVP_GUEST_REPO to guest and then
install the TDX kernel.

Signed-off-by: Feng, Jialei <jialei.feng@intel.com>

tools/cvm-image-rewriter/pre-stage/07-install-mvp-guest/README.md

@@ -0,0 +1,17 @@
+# Install MVP TDX guest
+
+This plugin is used to install MVP TDX guest kernel from a given local repo.
+
+## Prerequisite
+- Please put MVP guest repo into ./artifacts
+- Set CVM_MVP_GUEST_REPO to the repo relative path, for example 2023ww45/mvp-tdx-stack-guest-ubuntu-22.04, guest_repo
+- If the original image is smaller then 1.5G, please also set the environment variable GUEST_SIZE larger.
+
+## Example output
+
+```
+CVM_MVP_GUEST_REPO: 2023ww45/mvp-tdx-stack-guest-ubuntu-22.04
+MVP guest local repo ./artifacts/2023ww45/mvp-tdx-stack-guest-ubuntu-22.04 check passed
+SUCCESS: MVP guest local repo ./artifacts/2023ww45/mvp-tdx-stack-guest-ubuntu-22.04 copied to guest /srv
+SUCCESS: Cloud config cloud-init/x-shellscript/07-install-mvp-guest.sh generated
+```

tools/cvm-image-rewriter/pre-stage/07-install-mvp-guest/host_run.sh

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+#!/bin/bash
+
+# Go to this dir
+pushd "$(dirname "$(readlink -f "$0")")" || exit 0
+
+# shellcheck disable=SC1091
+source ../../scripts/common.sh
+ARTIFACTS_HOST=./artifacts
+ARTIFACTS_GUEST=/srv
+
+# CVM_MVP_GUEST_REPO examples: 2023ww45/mvp-tdx-stack-guest-ubuntu-22.04, guest_repo
+if [[ -z "$CVM_MVP_GUEST_REPO" ]]; then
+    warn "CVM_MVP_GUEST_REPO is not set, skip"
+    warn "Please put MVP guest repo into $ARTIFACTS_HOST"
+    warn "Then set CVM_MVP_GUEST_REPO to the repo relative path"
+    exit 0
+fi
+info "CVM_MVP_GUEST_REPO: $CVM_MVP_GUEST_REPO"
+
+# Check if the local repo exists
+MVP_GUEST_REPO_LOCAL="$ARTIFACTS_HOST/$CVM_MVP_GUEST_REPO"
+if [[ ! -d "$MVP_GUEST_REPO_LOCAL" ]]; then
+    warn "MVP guest local repo $MVP_GUEST_REPO_LOCAL does not exist, skip"
+    exit 0
+fi
+# Check if it is a valid MVP repo
+if ! compgen -G "$MVP_GUEST_REPO_LOCAL/jammy/amd64/linux-image-*mvp*.deb"; then
+    warn "$MVP_GUEST_REPO_LOCAL is invalid, skip"
+    exit 0
+fi
+info "MVP guest local repo $MVP_GUEST_REPO_LOCAL check passed"
+
+# Copy MVP local repo from host to guest
+virt-copy-in -a "${GUEST_IMG}" "$MVP_GUEST_REPO_LOCAL" "$ARTIFACTS_GUEST"
+ok "MVP guest local repo $MVP_GUEST_REPO_LOCAL copied to guest $ARTIFACTS_GUEST"
+
+# Generate cloud-config
+mkdir -p cloud-init/x-shellscript/
+cat > cloud-init/x-shellscript/07-install-mvp-guest.sh << EOL
+#!/bin/bash
+
+PACKAGE_DIR="$ARTIFACTS_GUEST/$(basename "$CVM_MVP_GUEST_REPO")/jammy/"
+pushd \$PACKAGE_DIR || exit 0
+apt install ./amd64/linux-image-unsigned-*.deb ./amd64/linux-modules-*.deb \
+        ./amd64/linux-headers-*.deb ./all/linux-headers-*.deb --allow-downgrades -y
+popd || exit 0
+EOL
+ok "Cloud config cloud-init/x-shellscript/07-install-mvp-guest.sh generated"
+
+popd || exit 0