patch-image.sh

#!/usr/bin/bash

set -euxo pipefail

patch_file="/tmp/${PATCH_LIST}"

while IFS= read -r line
do
    EXEC=$(echo "$line" | cut -d " " -f1)
    echo "$EXEC"

    case $EXEC in

        REBUILD)
            # each line is in the form "exec project_dir refsspec" where:
            # - project is the last part of the project url including the org,
            # for example openstack/ironic
            # - refspec is the gerrit refspec of the patch we want to test,
            # for example refs/changes/67/759567/1
            PROJECT=$(echo "$line" | cut -d " " -f2)
            PROJ_NAME=$(echo "$PROJECT" | cut -d "/" -f2)
            PROJ_URL="https://opendev.org/${PROJECT}"
            REFSPEC=$(echo "$line" | cut -d " " -f3)

            cd /tmp
            git clone "$PROJ_URL"
            cd "$PROJ_NAME"
            git fetch "$PROJ_URL" "$REFSPEC"
            git checkout FETCH_HEAD

            SKIP_GENERATE_AUTHORS=1 SKIP_WRITE_GIT_CHANGELOG=1 ${PYTHON_VERSION} setup.py sdist
            ${PYTHON_VERSION} -m pip install --prefix /usr dist/*.tar.gz

            # clean local repo
            cd ..
            rm -fr "$PROJ_NAME"
            ;;

        PATCH)
            PYTHON_LIB_PATH=$(${PYTHON_VERSION} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")
            PATCH_URL=$(echo "$line" | cut -d " " -f3)

            cd /tmp
            wget --content-disposition "$PATCH_URL"
            ZIPPED_PATCH_FILE=$(find . -maxdepth 1 -name '*.zip' -printf '%T@ %p\n' | sort -n | tail -n 1 | cut -d' ' -f2)
            unzip "$ZIPPED_PATCH_FILE"
            PATCH_FILE=$(basename "$ZIPPED_PATCH_FILE" .zip)

            # The container contains the installed package, not its source
            # tree.  Install requirements added by the patch separately.
            CHANGED_REQUIREMENTS_FILE="${PATCH_FILE}.requirements"
            awk '
                /^diff --git / {
                    in_requirements = ($0 ~ / b\/requirements\.txt$/)
                    next
                }
                in_requirements && /^\+\+\+ / { next }
                in_requirements && /^\+/ {
                    requirement = substr($0, 2)
                    if (requirement !~ /^[[:space:]]*($|#)/) print requirement
                }
            ' "$PATCH_FILE" > "$CHANGED_REQUIREMENTS_FILE"

            if [ -s "$CHANGED_REQUIREMENTS_FILE" ]; then
                echo "Installing requirements added by $PATCH_FILE"
                ${PYTHON_VERSION} -m pip install --no-cache-dir \
                    -r "$CHANGED_REQUIREMENTS_FILE"
            fi

            rm -f "$CHANGED_REQUIREMENTS_FILE"
            patch -d"${PYTHON_LIB_PATH}" -f -N -p1 < "$PATCH_FILE" || true

            # clean patch file
            rm -f "$PATCH_FILE"
            ;;

        *)
            echo "$EXEC operation not supported, closing."
            exit 1
            ;;

    esac

done < "$patch_file"

cd /