Commit 68380db4c4 moved from
'gexp->derivation', which as a side effect, would lead tests to require
a "world rebuild"--specifically, they'd have to build (default-guile).
This was mitigated by 68775338a5, but that
change introduced another regression.
* guix/scripts/pack.scm (populate-profile-root): Define 'bootstrap?'.
Pass #:guile to 'computed-file', with a value depending on 'bootstrap?'.
* tests/pack.scm ("self-contained-tarball + localstatedir")
("docker-image + localstatedir", "squashfs-image + localstatedir")
("deb archive with symlinks and control files")
("rpm archive can be installed/uninstalled"): Use a <profile> record
instead of a derivation.
