File

####> This option file is used in: ####> podman build, podman-build.unit.5.md.in, farm build ####> If file is edited, make sure the changes ####> are applicable to all of those. << if is_quadlet >>

File=Containerfile

<< else >>

--file, -f=Containerfile

<< endif >>

Specifies a Containerfile which contains instructions for building the image, either a local file or an http or https URL. If more than one Containerfile is specified, FROM instructions are only accepted from the last specified file.

<< if is_quadlet >> Note that for a given relative path to a Containerfile, or when using a http(s):// URL, also set SetWorkingDirectory= in order for podman build to find a valid context directory for the resources specified in the Containerfile.

Note that setting a File= field is mandatory for a .build file, unless SetWorkingDirectory (or a WorkingDirectory in the Service group) has also been set. << else >> If a build context is not specified, and at least one Containerfile is a local file, the directory in which it resides is used as the build context. << endif >>

Specifying the option << 'File=-' if is_quadlet else '-f -' >> causes the Containerfile contents to be read from stdin.