### Bug Description Trying to build the [nextcloud-snap](https://github.com/nextcloud-snap/nextcloud-snap), which uses [local plugins](https://github.com/nextcloud-snap/nextcloud-snap/tree/master/snap/plugins), with snapcraft v7.x fails. It works OK with snapcraft v6.x See https://forum.snapcraft.io/t/snapcraft-7-refuses-to-build-core18-snap/30592 for more context. ### To Reproduce Try to build the [nextcloud-snap](https://github.com/nextcloud-snap/nextcloud-snap) with snapcraft >= 7.0 ### Environment Using LXD on Ubuntu 20.04 LTS. ### snapcraft.yaml ```shell name: nextcloud version: git summary: Nextcloud Server - A safe home for all your data description: | Access, share and protect your files, calendars, contacts, communication and more at home and in your enterprise. grade: stable confinement: strict base: core18 architectures: - build-on: amd64 - build-on: i386 - build-on: arm64 - build-on: armhf - build-on: ppc64el apps: # Apache daemon apache: command: bin/run-httpd -k start -DFOREGROUND stop-command: bin/httpd-wrapper -k stop reload-command: bin/httpd-wrapper -k graceful daemon: simple restart-condition: always plugs: [network, network-bind, removable-media] # MySQL daemon mysql: command: bin/start_mysql stop-command: support-files/mysql.server stop reload-command: bin/reload-mysql daemon: simple restart-condition: always plugs: [network, network-bind] # PHP FPM daemon php-fpm: command: bin/start-php-fpm reload-command: bin/reload-php daemon: simple restart-condition: always plugs: - network - network-bind # Optional interface for observing network in system settings - network-observe # Optional interface for accessing removable media - removable-media # redis server daemon redis-server: command: bin/start-redis-server daemon: simple restart-condition: always plugs: [network, network-bind] # MySQL client mysql-client: command: bin/run-mysql plugs: [network, network-bind] mysqldump: command: bin/run-mysqldump plugs: [network, network-bind] # Nextcloud occ command occ: command: bin/occ plugs: [network, network-bind, removable-media] enable-https: command: bin/enable-https plugs: [network, network-bind] disable-https: command: bin/disable-https plugs: [network, network-bind] renew-certs: command: bin/renew-certs daemon: simple restart-condition: always plugs: [network, network-bind] nextcloud-cron: command: bin/nextcloud-cron daemon: simple restart-condition: on-failure plugs: [network, network-bind, removable-media] # Command for manually installing instead of visiting site to create admin. manual-install: command: bin/manual-install plugs: [network, network-bind, removable-media] import: command: bin/import-data plugs: [network, network-bind, removable-media] export: command: bin/export-data plugs: [network, network-bind, removable-media] # Service for automatically fixing Nextcloud indices, etc. nextcloud-fixer: command: bin/nextcloud-fixer daemon: simple restart-condition: on-failure plugs: [network, network-bind, removable-media] logrotate: command: bin/run-logrotate daemon: simple restart-condition: on-failure timer: 00:00 # Run once a day at midnight hooks: configure: plugs: [network, network-bind, removable-media] pre-refresh: plugs: [network, network-bind, removable-media] parts: apache: plugin: apache source: https://dlcdn.apache.org/httpd/httpd-2.4.57.tar.bz2 source-checksum: sha256/dbccb84aee95e095edfbb81e5eb926ccd24e6ada55dcd83caecb262e5cf94d2a build-packages: - libbrotli-dev stage-packages: - libbrotli1 # The built-in Apache modules to enable modules: - headers - proxy - proxy_fcgi - setenvif - env - rewrite - mime - dir - authz_core - unixd - alias - ssl - socache_shmcb - slotmem_shm - log_config - logio - brotli - filter filesets: exclude: - -man - -manual - -htdocs - -include - -build - -conf/httpd.conf - -conf/magic - -conf/original - -conf/extra - -bin/apachectl - -bin/envvars* stage: - $exclude prime: - $exclude apache-customizations: plugin: dump source: src/apache/ nextcloud: plugin: dump source: https://download.nextcloud.com/server/releases/nextcloud-26.0.3.tar.bz2 source-checksum: sha256/a5a810cbcd7c3dcff25f22809321f2ed41ed7cc0601204489ac90e258060b5c9 organize: '*': htdocs/ '.htaccess': htdocs/.htaccess '.user.ini': htdocs/.user.ini # This snap automatically updates. No need to include the updater to nag # users. This does not result in an integrity check failure. prime: - -htdocs/apps/updatenotification php: plugin: php source: https://php.net/get/php-8.1.20.tar.bz2/from/this/mirror source-checksum: sha256/55578587514a2707500f85319e57c0d4df9b8803cdb26566595ac4bf459dc4dd source-type: tar install-via: prefix configflags: - --enable-fpm - --disable-cgi - --disable-phar - --disable-phpdbg - --enable-ctype - --enable-mbstring - --with-zip - --with-pdo-mysql - --with-zlib - --enable-gd - --with-curl - --with-openssl - --with-bz2 - --enable-exif - --enable-intl - --enable-pcntl - --with-jpeg - --with-freetype - --disable-rpath - --enable-ftp - --enable-bcmath - --enable-sysvsem # Enable ldap - --with-libdir=lib/$SNAPCRAFT_ARCH_TRIPLET - --with-ldap # Enable gmp - --with-gmp # Enable argon2 - --with-password-argon2 # Disable sqlite (we use mysql) - --without-sqlite3 - --without-pdo-sqlite build-packages: - libxml2-dev - libcurl4-openssl-dev - libpng-dev - libjpeg8-dev - libbz2-dev - libmcrypt-dev - libldap2-dev - libfreetype6-dev - libgmp-dev - libzip-dev - libargon2-0-dev # This is no longer bundled with PHP as of v7.4 - libonig-dev stage-packages: - libasn1-8-heimdal - libcurl4 - libfreetype6 - libgssapi3-heimdal - libhcrypto4-heimdal - libheimbase1-heimdal - libheimntlm0-heimdal - libhx509-5-heimdal - libicu60 - libjpeg8 - libkrb5-26-heimdal - libldap-2.4-2 - libnghttp2-14 - libpng16-16 - libpsl5 - libroken18-heimdal - librtmp1 - libsasl2-2 - libwind0-heimdal - libxml2 - libzip4 - libargon2-0 - libonig4 prime: - -sbin/ - -etc/ organize: # Put php-fpm in bin with everything else, not sbin. sbin/php-fpm: bin/php-fpm extensions: # Build the redis PHP module - source: https://github.com/phpredis/phpredis/archive/5.3.7.tar.gz source-checksum: sha256/6f5cda93aac8c1c4bafa45255460292571fb2f029b0ac4a5a4dc66987a9529e6 redis: plugin: redis source: https://download.redis.io/releases/redis-6.2.12.tar.gz source-checksum: sha256/75352eef41e97e84bfa94292cbac79e5add5345fc79787df5cbdff703353fb1b redis-customizations: plugin: dump source: src/redis/ organize: config/*: config/redis/ after: [envsubst] # Copy over our PHP configuration file. php-customizations: plugin: dump source: src/php/ organize: config/*: config/php/ stage-packages: [mawk] # Copy over our Nextcloud configuration files nextcloud-customizations: plugin: dump source: src/nextcloud/ organize: config/: htdocs/config/ stage-packages: # jq is needed for parsing occ's json output - jq # The collabora appimage requires this - libfontconfig1 boost: plugin: dump source: https://sourceforge.net/projects/boost/files/boost/1.77.0/boost_1_77_0.tar.bz2 source-checksum: sha1/0cb4f947d094fc311e13ffacaff00418130ef5ef stage: - boost/ prime: - -* mysql: plugin: cmake after: [boost] # Get from https://dev.mysql.com/downloads/mysql/ source: https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-boost-8.0.33.tar.gz source-checksum: md5/20ffc71fb8acd705cdc4a8ae4cdedf23 configflags: - -DCMAKE_INSTALL_PREFIX=/ - -DBUILD_CONFIG=mysql_release - -DCMAKE_BUILD_TYPE=Release - -DWITH_UNIT_TESTS=OFF - -DWITH_EMBEDDED_SERVER=OFF - -DWITH_ARCHIVE_STORAGE_ENGINE=OFF - -DWITH_EXAMPLE_STORAGE_ENGINE=OFF - -DWITH_BLACKHOLE_STORAGE_ENGINE=OFF - -DWITH_FEDERATED_STORAGE_ENGINE=OFF - -DWITH_PARTITION_STORAGE_ENGINE=OFF - -DWITH_PERFSCHEMA_STORAGE_ENGINE=OFF - -DWITH_DEBUG=OFF - -DWITH_INNODB_EXTRA_DEBUG=OFF - -DINSTALL_MYSQLTESTDIR= - -DDOWNLOAD_BOOST=OFF - -DWITH_BOOST=$SNAPCRAFT_STAGE override-build: | snapcraftctl build # MySQL v8 is massive. Strip it. find "$SNAPCRAFT_PART_INSTALL/bin" -type f -exec sh -c 'grep -IL . "$1" || strip --strip-all "$1"' sh "{}" \; build-packages: - libncurses5-dev - binutils - gcc-8 - g++-8 stage: # Remove scripts that we'll be replacing with our own - -support-files/mysql.server - -COPYING # Remove unused binaries that waste space - -bin/comp_err - -bin/ibd2sdi - -bin/innochecksum - -bin/lz4_decompress - -bin/myisam_ftdump - -bin/myisam* - -bin/mysql_client_test - -bin/mysql_config* - -bin/mysql_secure_installation - -bin/mysql_ssl_rsa_setup - -bin/mysql_tzinfo_to_sql - -bin/mysql_upgrade - -bin/mysqladmin - -bin/mysqlbinlog - -bin/mysqlcheck - -bin/mysqld_multi - -bin/mysqlimport - -bin/mysqlpump - -bin/mysqlrouter* - -bin/mysqlshow - -bin/mysqlslap - -bin/mysqltest* - -bin/perror - -bin/zlib_decompress # Copy over our MySQL scripts mysql-customizations: plugin: dump source: src/mysql/ patches: source: src/patches plugin: dump prime: - -* delay-on-failure: plugin: dump source: src/delay-on-failure/ certbot: plugin: python python-version: python2 source: src/https/ requirements: ["requirements.txt"] build-packages: [libffi-dev] after: [patches] override-build: | snapcraftctl build patch -p1 -d $SNAPCRAFT_PART_INSTALL/lib/python2.7/site-packages/certbot < $SNAPCRAFT_STAGE/certbot-remove-default-config-files.patch patch -p1 -d $SNAPCRAFT_PART_INSTALL/lib/python2.7/site-packages/certbot < $SNAPCRAFT_STAGE/certbot-remove-storage-chown.patch setup-https: plugin: dump source: src/https/ stage-packages: [openssl] stage: [-etc/ssl, -requirements.txt] import-export: plugin: dump source: src/import-export stage-packages: [rsync] common: plugin: dump source: src/common/ hooks: plugin: dump source: src/hooks/ organize: bin/: snap/hooks/ stage-packages: [curl] logrotate: plugin: dump source: src/logrotate/ organize: config/*: config/logrotate/ usr/sbin/*: bin/ stage-packages: [logrotate] stage: - bin/* - config/* - utilities/* after: [envsubst] migrations: plugin: dump source: src/migrations/ envsubst: plugin: nil stage-packages: [gettext-base] stage: [usr/bin/envsubst] ``` ### Relevant log output ```shell Sorry, an error occurred in Snapcraft: module 'snapcraft' has no attribute 'sources' Traceback (most recent call last): File "/snap/snapcraft/7720/lib/python3.8/site-packages/snapcraft/cli.py", line 188, in run dispatcher.run() File "/snap/snapcraft/7720/lib/python3.8/site-packages/craft_cli/dispatcher.py", line 406, in run return self._loaded_command.run(self._parsed_command_args) File "/snap/snapcraft/7720/lib/python3.8/site-packages/snapcraft/commands/lifecycle.py", line 82, in run parts_lifecycle.run(self.name, parsed_args) File "/snap/snapcraft/7720/lib/python3.8/site-packages/snapcraft/parts/lifecycle.py", line 135, in run yaml_data = process_yaml(snap_project.project_file) File "/snap/snapcraft/7720/lib/python3.8/site-packages/snapcraft/parts/lifecycle.py", line 86, in process_yaml yaml_data = yaml_utils.load(yaml_file) File "/snap/snapcraft/7720/lib/python3.8/site-packages/snapcraft/parts/yaml_utils.py", line 92, in load raise errors.LegacyFallback("base is not core22") snapcraft.errors.LegacyFallback: base is not core22 ``` ### Additional context _No response_