Each part is composed of five steps, known as the "lifecycle".
See Part lifecycle and Parts environment variables to learn more about the Parts lifeycle and its environment variables.
| Step | Command | Purpose | Directory | Path |
|---|---|---|---|---|
| Pull | snapcraft pull [<part-name>] |
Downloads or retrieve the components' sources and external dependencies needed to build the part. | Components' sources and external dependencies are put in CRAFT_PART_SRC or CRAFT_PART_SRC_WORK if the source subdirectory is overridden. | parts/<part-name>/src or parts/<part-name>/src/<subdirectory> |
| Build | snapcraft build [<part-name>] |
Builds the components from the previously pulled sources. | Build the sources in CRAFT_PART_BUILD and places the result in CRAFT_PART_INSTALL. | parts/<part-name>/build and parts/<part-name>/install |
| Stage | snapcraft stage [<part-name>] |
Copies the built components into the staging area. | The built components are put in CRAFT_STAGE. | stage |
| Prime | snapcraft prime [<part-name>] |
Copies the staged components into the priming area. | The staged components are put in CRAFT_PRIME. | prime |
| Pack | snapcraft pack or snapcraft |
Takes the contents of the prime directory and packs it into a snap. | The snap is put in CRAFT_PROJECT_DIR. | The path to the current project’s subtree in the filesystem. |