Hello! ‘--export-manifest’ does not apply transformations to packages preceded by ‘-D’ (development environment):
--8<---------------cut here---------------start------------->8--- $ guix shell -D guile-git --with-branch=libgit2=main --export-manifest ;; What follows is a "manifest" equivalent to the command line you gave. ;; You can store it in a file that you may then pass to any 'guix' command ;; that accepts a '--manifest' (or '-m') option. (package->development-manifest (specification->package "guile-git")) $ guix shell guile-git --with-branch=libgit2=main --export-manifest ;; What follows is a "manifest" equivalent to the command line you gave. ;; You can store it in a file that you may then pass to any 'guix' command ;; that accepts a '--manifest' (or '-m') option. (use-modules (guix transformations)) (define transform1 (options->transformation '((with-branch . "libgit2=main")))) (packages->manifest (list (transform1 (specification->package "guile-git")))) $ guix describe Generation 283 Dec 04 2023 00:32:23 (current) guix 6e2dd51 repository URL: https://git.savannah.gnu.org/git/guix.git branch: master commit: 6e2dd51df5f3f51e9056dd4f2e1b036195ab3caa --8<---------------cut here---------------end--------------->8--- Ludo’.