This code duplicates the (gnu system image) and (gnu build image) code. Using
VM for image generation is not needed, not portable and really slow. Remove
all the VM image generation code to make sure that only the image API is used.

* gnu/build/vm.scm: Remove it. Move the qemu-command procedure to ...
* gnu/build/marionette.scm: ... here.
* gnu/local.mk (GNU_SYSTEM_MODULES): Adapt it.
* tests/modules.scm: Ditto.
* gnu/tests/install.scm: Ditto.
* gnu/system/vm.scm: Adapt it and remove expression->derivation-in-linux-vm,
qemu-img, system-qemu-image/shared-store and system-docker-image procedures.
* doc/guix.texi (G-Expressions): Adapt it.

* doc/guix-cookbook.texi: Update copyright/name for Christine Lemmer-Webber.
* gnu/build/image.scm: Likewise.
* gnu/build/vm.scm: Likewise.
* gnu/packages/admin.scm: Likewise.
* gnu/packages/assembly.scm: Likewise.
* gnu/packages/audio.scm: Likewise.
* gnu/packages/backup.scm: Likewise.
* gnu/packages/check.scm: Likewise.
* gnu/packages/databases.scm: Likewise.
* gnu/packages/emacs-xyz.scm: Likewise.
* gnu/packages/finance.scm: Likewise.
* gnu/packages/gnupg.scm: Likewise.
* gnu/packages/guile-xyz.scm: Likewise.
* gnu/packages/guile.scm: Likewise.
* gnu/packages/haskell-xyz.scm: Likewise.
* gnu/packages/linux.scm: Likewise.
* gnu/packages/mail.scm: Likewise.
* gnu/packages/password-utils.scm: Likewise.
* gnu/packages/perl.scm: Likewise.
* gnu/packages/python-web.scm: Likewise.
* gnu/packages/python-xyz.scm: Likewise.
* gnu/packages/python.scm: Likewise.
* gnu/packages/sphinx.scm: Likewise.
* gnu/packages/ssh.scm: Likewise.
* gnu/packages/xdisorg.scm: Likewise.
* gnu/services/networking.scm: Likewise.
* gnu/system/vm.scm: Likewise.

Conflicts:

	gnu/local.mk
	gnu/packages/cmake.scm
	gnu/packages/curl.scm
	gnu/packages/gl.scm
	gnu/packages/glib.scm
	gnu/packages/guile.scm
	gnu/packages/node.scm
	gnu/packages/openldap.scm
	gnu/packages/package-management.scm
	gnu/packages/python-xyz.scm
	gnu/packages/python.scm
	gnu/packages/tls.scm
	gnu/packages/vpn.scm
	gnu/packages/xorg.scm

It is now up to the caller to deduplicate store contents.

* guix/store/database.scm (register-items): Remove #:deduplicate?
parameter and call to 'deduplicate'.
(register-path): Call 'deduplicate' when #:deduplicate? is true.
* gnu/build/image.scm (register-closure): Adjust call accordingly.
* gnu/build/vm.scm (register-closure): Likewise.
* guix/nar.scm (finalize-store-file): Likewise.
* guix/scripts/pack.scm (store-database): Likewise.

* gnu/build/image.scm (register-closure): Remove #:deduplicate?
parameter and pass #:deduplicate? #f to 'register-items'.
(initialize-root-partition): Adjust accordingly.
* gnu/build/vm.scm (register-closure, root-partition-initializer):
Likewise.

Until now deduplication was performed as an additional pass after
copying files, which involve re-traversing all the files that had just
been copied.

* guix/store/deduplication.scm (copy-file/deduplicate): New procedure.
* tests/store-deduplication.scm ("copy-file/deduplicate"): New test.
* guix/build/store-copy.scm (populate-store): Add #:deduplicate?
parameter and honor it.
* tests/gexp.scm ("gexp->derivation, store copy"): Pass #:deduplicate? #f
to 'populate-store'.
* gnu/build/image.scm (initialize-root-partition): Pass #:deduplicate?
to 'populate-store'.  Pass #:deduplicate? #f to 'register-closure'.
* gnu/build/vm.scm (root-partition-initializer): Likewise.
* gnu/build/install.scm (populate-single-profile-directory): Pass
 #:deduplicate? #f to 'populate-store'.
* gnu/build/linux-initrd.scm (build-initrd): Likewise.
* guix/scripts/pack.scm (self-contained-tarball)[import-module?]: New
procedure.
[build]: Pass it as an argument to 'source-module-closure'.
* guix/scripts/pack.scm (squashfs-image)[build]: Wrap in
'with-extensions'.
* gnu/system/linux-initrd.scm (expression->initrd)[import-module?]: New
procedure.
[builder]: Pass it to 'source-module-closure'.
* gnu/system/install.scm (cow-store-service-type)[import-module?]: New
procedure.  Pass it to 'source-module-closure'.

The assumption now is that the caller took care of resetting timestamps
and permissions.

* guix/store/database.scm (register-items): Remove #:reset-timestamps?
parameter and the call to 'reset-timestamps'.
(register-path): Adjust accordingly and add call to 'reset-timestamps'.
* gnu/build/image.scm (register-closure): Remove #:reset-timestamps?
parameter to 'register-items'.
* gnu/build/vm.scm (register-closure): Likewise.
* guix/nar.scm (finalize-store-file): Adjust accordingly.
* guix/scripts/pack.scm (store-database)[build]: Likewise.

* gnu/build/image.scm (register-closure): Remove #:reset-timestamps?
parameter.  Pass #:reset-timestamps? #f to 'register-items'.
(initialize-root-partition): Adjust accordingly.
* gnu/build/vm.scm (register-closure, root-partition-initializer):
Likewise.

Until now, 'populate-store' would reset permissions but not timestamps,
so callers would resort to going through an extra directory traversal to
reset timestamps.

* guix/build/store-copy.scm (reset-permissions): Remove.
(copy-recursively): New procedure.
(populate-store): Pass #:keep-permissions? to 'copy-recursively'.
Remove call to 'reset-permissions'.
* tests/gexp.scm ("gexp->derivation, store copy"): In BUILD-DRV, check
whether 'populate-store' canonicalizes permissions and timestamps.
* gnu/build/image.scm (initialize-root-partition): Pass #:reset-timestamps? #f
to 'register-closure'.
* gnu/build/vm.scm (root-partition-initializer): Likewise.