Turn SEXP, an sexp as returned by 'menu-entry->sexp', into a <menu-entry> record.

Define a chain of bootloaders with the FINAL-BOOTLOADER, optional PACKAGES, and optional directories and files from the store given in the list of FILES.

The package of the FINAL-BOOTLOADER and all PACKAGES and FILES will be placed in an efi-bootloader-profile, which will be passed to the INSTALLER.

FILES may contain file-like objects produced by procedures like plain-file, local-file, etc., or package contents produced with file-append.

If a directory name in FILES ends with '/', then the directory content instead of the directory itself will be symlinked into the efi-bootloader-profile.

The procedures in the HOOKS list can be used to further modify the bootloader profile. It is possible to pass a single function instead of a list.

If the INSTALLER argument is used, then this gexp procedure will be called to install the efi-bootloader-profile. Otherwise the installer of the FINAL-BOOTLOADER will be called.

If the DISK-IMAGE-INSTALLER is used, then this gexp procedure will be called to install the efi-bootloader-profile into a disk image. Otherwise the disk-image-installer of the FINAL-BOOTLOADER will be called.

Write ENTRIES to FILE-OR-PORT. When FILE-OR-PORT is a file name, write to it atomically and set the appropriate permissions.

Return three values: the list of group entries, the list of password entries, and the list of shadow entries corresponding to USERS and GROUPS. Preserve stateful bits from CURRENT-PASSWD, CURRENT-GROUPS, and CURRENT-SHADOW: UIDs, GIDs, passwords, user shells, etc.