calamares/src/modules/unpackfs/unpackfs.conf

# Unsquash / unpack a filesystem. Multiple sources are supported, and
# they may be squashed or plain filesystems.
#
# Configuration:
#
#   from globalstorage: rootMountPoint
#   from job.configuration: the path to where to mount the source image(s)
#       for copying an ordered list of unpack mappings for image file <->
#       target dir relative to rootMountPoint.

---
# Each list item is unpacked, in order, to the target system.
#
# Each list item has the following attributes:
#   source: path relative to the live / intstalling system to the image
#   sourcefs: the type of the source files; valid entries are
#       - *ext4* (copies the filesystem contents)
#       - *squashfs* (unsquashes)
#       - *file* (copies a file or directory)
#       - (may be others if mount supports it)
#   destination: path relative to rootMountPoint (so in the target
#       system) where this filesystem is unpacked.
unpack:

# Usually you list a filesystem image to unpack; you can use
# squashfs or an ext4 image.
#
#   -   source: "/path/to/filesystem.sqfs"
#       sourcefs: "squashfs"
#       destination: ""

# You can list more than one filesystem.
#
#   -   source: "/path/to/another/filesystem.img"
#       sourcefs: "ext4"
#       destination: ""
#

# You can list filesystem source paths relative to the Calamares run
# directory, if you use -d (this is only useful for testing, though).
#    -   source: ./example.sqfs
#        sourcefs: squashfs
#        destination: ""
# You can list individual files
    -   source: ../CHANGES
        sourcefs: file
        destination: "/tmp/derp"
# .. or directories
    -   source: ../src/modules/dummycpp
        sourcefs: file
        destination: "/tmp/derp"