This partly reverts commit 185f669 ("services: Make sure the store's
group is the build group.")
* gnu/services/base.scm (guix-service)[activate]: Remove 'chown' call.
Add 'id' field to 'user-group' form.
* guix/build/install.scm (directives): Set the store's GID to 30000.
Before that the effect would be to re-create groups at each boot, and
thus remove any members of the groups.
* guix/build/activation.scm (activate-users+groups): Call 'add-group'
only when (getgrname name) fails.
* gnu/services/base.scm (guix-service)[activate]: New variable. Add
'chown' call for (%store-prefix). Set the 'activate' field to
ACTIVATE.
* guix/build/install.scm (directives): Add comment about STORE's group.
* gnu/system/file-systems.scm (<file-system>)[title]: New field.
* gnu/services/base.scm (file-system-service): Add #:title parameter.
In 'start' gexp, use 'canonicalize-device-spec' and honor TITLE.
* gnu/system.scm (other-file-system-services,
operating-system-root-file-system, operating-system-initrd-file):
Adjust accordingly.
* gnu/system/linux-initrd.scm (file-system->spec): Likewise.
* gnu/system/vm.scm (system-disk-image): Add 'title' field for the root
file system.
* guix/build/linux-initrd.scm (mount-file-system): Expect the second
element of SPEC to be the title.
(boot-system)[root-mount-point?, root-fs-type]: Likewise.
* gnu/services/dmd.scm (dmd-configuration-file): Select
'canonicalize-device-spec'.
* guix/build/linux-initrd.scm (canonicalize-device-spec): Add #:title
parameter. When resolving a label, wait a little and try several
times before bailing out.
* guix/build/linux-initrd.scm (make-disk-device-nodes): New procedure.
(make-essential-device-nodes): Use it. Make more devices nodes for
SCSI disks and CD-ROM devices.
* guix/build/vm.scm (format-partition): Add #:label parameter, and honor
it.
(initialize-hard-disk): Add #:file-system-label parameter, and pass it
to 'format-partition'.
* gnu/system/vm.scm (qemu-image): Add #:file-system-label parameter and
pass it to 'initialize-hard-disk'.
* gnu/system.scm (operating-system-activation-script): New procedure,
containing most of the former 'operating-system-boot-script'.
(operating-system-boot-script): Call it, and 'primitive-load' its
result.
* guix/build/activation.scm (%booted-system): Remove.
(activate-current-system): Remove #:boot? parameter and related code.
* guix/build/vm.scm (load-in-linux-vm): When MAKE-DISK-IMAGE?, use
'-drive ...,if=virtio' for better performance.
* gnu/system/vm.scm (qemu-image): Use /dev/vda instead of /dev/sda.
* guix/build/install.scm (install-grub): Call 'error' if 'system*'
returns non-zero.
* guix/build/vm.scm (initialize-partition-table): Make 'partition-size'
a positional parameter. Call 'error' when 'system*' returns
non-zero'.
(format-partition, initialize-root-partition): New procedures.
(initialize-hard-disk): Use them.
* guix/build/linux-initrd.scm (boot-system): Add pre-unwind handler in
'catch' form around 'primitive-load', and call 'format' and
'display-backtrace' from there.
* gnu/system.scm (etc-directory): Change default value of #:profile.
Change contents of SHELLS. Use /run/current-system/profile/{s,}bin in
BASHRC.
(operating-system-boot-script)[%modules]: Add (guix build
linux-initrd). Add call to 'activate-current-system' in gexp.
(operating-system-initrd-file, operating-system-grub.cfg): New
procedures.
(operating-system-derivation): Don't build grub.cfg here and remove it
from the file union.
* gnu/system/vm.scm (qemu-image): Remove #:populate.
(operating-system-build-gid, operating-system-default-contents):
Remove.
(system-qemu-image): Remove call to
'operating-system-default-contents'. Use 'operating-system-grub.cfg'
to get grub.cfg. Add GRUB.CFG to #:inputs.
(system-qemu-image/shared-store): Likewise, but don't add GRUB.CFG to
#:inputs.
(system-qemu-image/shared-store-script): Pass --system kernel option.
* guix/build/activation.scm (%booted-system, %current-system): New
variables.
(boot-time-system, activate-current-system): New procedures.
* guix/build/install.scm (evaluate-populate-directive): Add case
for ('directory name uid gid mode).
(directives, populate-root-file-system): New procedures.
* guix/build/vm.scm (initialize-hard-disk): Replace calls to
'evaluate-populate-directive' by a call to
'populate-root-file-system'.
* gnu/services/dmd.scm (dmd-configuration-file): Use
/run/current-system/profile/bin.
* gnu/services/xorg.scm (slim-service): Likewise.
* gnu/system/vm.scm (qemu-image): Rename #:inputs-to-copy to #:inputs,
and #:initialize-store? to #:register-closures?. Add #:copy-inputs?.
Adjust build gexp accordingly.
(system-qemu-image): Remove #:initialize-store? argument and add
#:copy-inputs?.
(system-qemu-image/shared-store): Add #:inputs, #:register-closures?,
and #:copy-inputs? arguments.
* guix/build/vm.scm (register-closure): New procedure.
(MS_BIND): New variable.
(initialize-hard-disk): Rename #:initialize-store? to
#:register-closures?, #:closures-to-copy to #:closures, and add
#:copy-closures?.
Add 'target-directory' and 'target-store' variables.
Call 'populate-store' only when COPY-CLOSURES?.
Bind-mount the store to TARGET-STORE when REGISTER-CLOSURES? and not
COPY-CLOSURES?. Add call to 'register-closure'.
* guix/build/linux-initrd.scm (pidof): New procedure.
(mount-root-file-system)[mark-as-not-killable]: New procedure.
Use it for unionfs when VOLATILE-ROOT?.
* gnu/services/base.scm (%do-not-kill-file): New variable.
(user-processes-service)[stop]: Honor it.
* gnu/services/base.scm (file-system-service): New procedure.
(user-processes-service): Add 'requirements' parameter.
* gnu/services/dmd.scm (dmd-configuration-file): Use (guix build
linux-initrd).
* guix/build/linux-initrd.scm (guix): Export 'check-file-system'.
* gnu/system.scm (file-union): New procedure.
(essential-services): Use it. Add that to the returned list.
* guix/build/linux-initrd.scm (switch-root): Delete file from the old
root. Chdir to / after 'chroot' call. Re-open file descriptors 0, 1,
and 2.
(boot-system): Move 'loading' message after the 'switch-root' call.
* gnu/system.scm (operating-system-boot-script): Add loop that closes
file descriptor before calling 'execl'.
* guix/build/linux-initrd.scm (move-essential-file-systems,
switch-root): New procedures.
(MS_MOVE): New variable.
(boot-system): Remove 'mount-essential-file-systems' call for ROOT.
Use 'switch-root' instead of chdir + chroot.
* gnu/system.scm (operating-system-derivation)[boot-file-systems]: Keep "/".
* gnu/system/linux-initrd.scm (file-system->spec): Keep the 'check?'
flag.
(qemu-initrd)[helper-packages]: New variable. Pass it as #:to-copy.
<gexp>: Add 'set-path-environment-variable' call. Remove #:unionfs
argument for 'boot-system'.
* gnu/system/vm.scm (%linux-vm-file-systems): Add 'check?' field/
(virtualized-operating-system): Likewise for the "9p" file system.
* guix/build/linux-initrd.scm (mount-root-file-system): Change #:unionfs
default. Call 'check-file-system' before mounting ROOT, when
VOLATILE-ROOT? is false.
(check-file-system): New procedure.
(mount-file-system): Honor 'check?' element in list; add
'check-file-system' call.
(boot-system): Remove #:root-fs-type and #:unionfs parameters.
[root-mount-point?, root-fs-type]: New variables.
Call 'mount-file-system' on all MOUNTS but "/".
* gnu/system.scm (<operating-system>)[initrd]: Default to
'qemu-initrd'.
(<file-system>): New record type.
(operating-system-root-file-system): New procedure.
(operating-system-derivation): Take the device name for GRUB from
'operating-system-root-file-system'. Pass the
'operating-system-initrd' procedure the list of boot file systems.
* gnu/system/linux-initrd.scm (file-system->spec): New procedure.
(qemu-initrd): Add 'file-systems' parameter, and remove #:mounts
parameter.
[file-system-type-predicate]: New procedure.
[linux-modules]: Use it.
Adjust #:mounts argument in 'boot-system' call.
(gnu-system-initrd): Remove.
* gnu/system/vm.scm (%linux-vm-file-systems): New variable.
(expression->derivation-in-linux-vm): Adjust call to 'qemu-initrd'.
(virtualized-operating-system): New procedure.
(system-qemu-image/shared-store-script)[initrd]: Remove. Use
'virtualized-operating-system'. Get the 'initrd' file from OS-DRV.
* guix/build/linux-initrd.scm (mount-qemu-smb-share, mount-qemu-9p):
Remove.
(MS_RDONLY, MS_BIND): New global variables.
(bind-mount): Remove local 'MS_BIND' definition.
(mount-root-file-system): New procedure, with code formerly in
'boot-system'.
(mount-file-system): New procedure.
(boot-system): Add #:root-fs-type parameter. Remove 'MS_RDONLY' local
variable. Use 'mount-root-file-system' and 'mount-file-system'.
* doc/guix.texi (Using the Configuration System): Add 'file-system'
declaration.
* gnu/system.scm (<operating-system>)[pam-services, setuid-programs]:
New fields.
(etc-directory)[bashrc]: Prepend /run/setuid-programs to $PATH.
(operating-system-etc-directory): Honor
'operating-system-pam-services'.
(%setuid-programs): New variable.
(operating-system-boot-script): Add (guix build utils) to the set of
imported modules. Call 'activate-setuid-programs' in boot script.
* gnu/system/linux.scm (base-pam-services): New procedure.
* guix/build/activation.scm (%setuid-directory): New variable.
(activate-setuid-programs): New procedure.
* build-aux/hydra/demo-os.scm: Add 'pam-services' field.
definitions accordingly.
* guix/build/cmake-build-system.scm (configure): Add flags.
* gnu/packages/maths.scm (lapack): Drop special code.
* gnu/packages/ssh.scm (libssh): Drop special code.
* gnu/packages/slim.scm (slim): Drop special code and enable shared library.
Co-authored-by: Eric Bavier <bavier@member.fsf.org>
* guix/build/linux-initrd.scm (make-essential-device-nodes): Make
/dev/fuse.
(boot-system): Add #:unionfs parameter. Invoke UNIONFS instead of
copying files over when VOLATILE-ROOT? is true.
* gnu/system/linux-initrd.scm (expression->initrd): Add #:inputs
parameter.
[files-to-copy]: New procedure.
[builder]: Add 'to-copy' parameter; honor it.
(qemu-initrd)[linux-modules]: Add 'fuse.ko' when VOLATILE-ROOT?.
Pass UNIONFS-FUSE/STATIC as #:inputs; change builder to pass #:unionfs
to 'boot-system'.
Fixes the creation of single-package profiles, reported by Ludovic Courtès.
* guix/build/union.scm (union-build): Add new internal procedure
'union-of-directories' that always creates a directory, containing the code
previously used only to merge multiple directories. Call it from the
multiple-directory case in 'union' and from the top-level 'union-build'.
* guix/build/union.scm: Rewrite; only 'file=?' remains unchanged. Remove
'tree-union' and 'delete-duplicate-leaves' exports. Merge inputs in a
breadth-first fashion. Follow symlinks for purposes of making decisions
about the merge.
* tests/union.scm: Remove tests of 'tree-union' and 'delete-duplicate-leaves'.
* guix/build/download.scm (http-fetch)[post-2.0.7?]: Use
'string->number' and numeric comparison. This fixes version
comparison with "2.0.10" and subsequent 2.0 releases.
* gnu/packages/ld-wrapper.scm (%store-directory): Change the default to
/gnu/store.
* guix/build/utils.scm (%store-directory): New procedure.
(remove-store-references): Use it for the default value of 'store'.
* guix/packages.scm (patch-and-repack)[builder]: Change default store to
/gnu/store.
* guix/build/gnu-build-system.scm (unpack): Check if SOURCE is a
directory, and copy it locally if it is.
* gnu/packages/libwebsockets.scm (libwebsockets)[arguments]: Remove
'unpack' phase.
* guix/build/union.scm (file=?): Return #f if FILE1 and FILE2 are not
regular files. Fixes a bug whereby collisions among directories would
lead to the invocation of 'file=?' and thus 'call-with-input-file' on
directories. Reported by Mark H. Weaver <mhw@netris.org>.
Fixes <http://bugs.gnu.org/16703>.
Reported by Raimon Grau <raimonster@gmail.com>.
* guix/build/download.scm (http-fetch)[headers]: New variable.
Pass it as #:headers or #:extra-headers to 'http-get' and
'http-get*'.
* gnu/system/linux-initrd.scm (qemu-initrd)[virtio-9p-modules]: New
variable.
[linux-modules]: Append VIRTIO-9P-MODULES when a 9p file system is in
MOUNTS.
* guix/build/linux-initrd.scm (mount-qemu-9p): New procedure.
(boot-system): Recognize '9p' in MOUNTS, and use 'mount-qemu-9p'.
* guix/build/linux-initrd.scm (make-essential-device-nodes): Rename
devices with major = 8 to /dev/sda*. Make /dev/vda* devices.
* gnu/system/vm.scm (qemu-image): Change '/dev/vda' to '/dev/sda'.
* gnu/system.scm (operating-system-derivation): Likewise.
* guix/build/linux-initrd.scm (boot-system): New procedure.
* gnu/system/linux-initrd.scm (qemu-initrd): Add keyword parameters
'guile-modules-in-chroot?' and 'mounts'. Change builder to simply
call 'boot-system'.
(gnu-system-initrd): Change to a simple call to 'qemu-initrd'.
* gnu/system/vm.scm (expression->derivation-in-linux-vm): Call
'qemu-initrd' with #:guile-modules-in-chroot?.
* guix/build-system/cmake.scm (cmake-build): Change 'out-of-source?' to
default to #t.
* guix/build/cmake-build-system.scm (configure): Add 'out-of-source?'
keyword parameter and honor it.
Reported at <http://bugs.gnu.org/15608>.
* guix/build/utils.scm (find-files): Change the 'error' procedure to
return RESULT. Before we would end up with an improper list.
build system (switches to Python 3) and compute python-version instead of
passing it as a parameter.
* guix/build-system/python.scm (default-python): Switch to python-wrapper.
* guix/build-system/python.scm (python-build): Drop parameter #:python-version.
* guix/build/python-build-system.scm (wrap): Compute python version from input.
This significantly reduces I/O when building profiles, especially with
lots of package-specific sub-directories (such as 'share/emacs/24.3',
'texmf', etc.)
* guix/build/union.scm (union-build)[file-tree](others-have-it?): New
procedure. Use it in the 'enter?' parameter of 'file-system-fold';
change 'skip' parameter accordingly.
* tests/union.scm ("union-build"): Ensure that 'include' is a symlink
and 'bin' is a directory.
* gnu/packages/linux-initrd.scm (qemu-initrd): Add (guix build utils) to
#:modules, and use it. Copy .scm and .go files to /root.
* guix/build/linux-initrd.scm (bind-mount): New procedure.
* gnu/packages/linux-initrd.scm (qemu-initrd): Add #:modules argument.
Factorize and move some of the code to...
* guix/build/linux-initrd.scm: ... here. New file.
* Makefile.am (MODULES): Add it.
* guix/build/gnu-dist.scm: New file.
* Makefile.am (MODULES): Add it.
* guix/build-system/gnu.scm (%default-modules): New variable.
(gnu-build): Use it.
(dist-package): New procedure.
* guix/build/utils.scm (set-path-environment-variable): When VALUE is
the empty string, call `unsetenv' instead of `setenv'.
* gnu/packages/guile.scm (guile-2.0)[arguments]: Remove `unsetenv'
trick.
* guix/scripts/substitute-binary.scm (decompressed-port): Improve docstring.
(progress-report-port): New procedure.
(guix-substitute-binary)["--substitute"]: Use it to report progress.
* guix/build/download.scm: Export `progress-proc' and `uri-abbreviation'.
* guix/build-system/gnu.scm (inputs-search-paths): New procedure.
(standard-search-paths): Use it.
(expand-inputs): New procedure.
(standard-inputs): Use it.
(standard-cross-packages, standard-cross-inputs,
standard-cross-search-paths, gnu-cross-build): New procedures.
(gnu-build-system): Set `cross-build' field to `gnu-cross-build'.
* gnu/packages/cross-base.scm: Export `cross-gcc', `cross-binutils', and
`cross-libc'.
* guix/build/gnu-cross-build.scm: New file.
* Makefile.am (MODULES): Add it.
This would manifest when downloading a large file such as the Bazaar
tarball, leading to an "Error in the pull function" GnuTLS exception.
* guix/build/download.scm (add-weak-reference): New procedure.
(tls-wrap): Add (add-weak-reference record port).
* guix/build/rpath.scm: New file.
* Makefile.am (MODULES): Add it.
* gnu/packages/python.scm (python): Use it; remove local copy of
the *rpath* procedures.
* gnu/packages/samba.scm (samba): Likewise.
* guix/build/utils.scm (wrap-program): Fix computation of PROG-REAL and
PROG-TMP when PROG is an absolute file name. Add "$@" in the
generated script, and quote PROG-REAL.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
* guix/build/utils.scm (patch-shebang): Do not add a space after a command
interpreter not followed by an argument; this made two tests of
coreutils fail.
* guix/build/union.scm (union-build): Prepend "." to the result of
`union-tree', to match the expectations of `delete-duplicate-leaves'.
Don't do mkdir when SUBDIR is ".".
* tests/union.scm ("union-build"): Keep duplicates in %BOOTSTRAP-INPUTS.
* guix/build/download.scm: Autoload (gnutls).
(tls-wrap): New procedure.
(open-connection-for-uri): Add support for `https'. Wrap the socket
with `tls-wrap' in that case.
(url-fetch): Add `https'.
* guix/download.scm (gnutls-derivation): New procedure.
(url-fetch)[need-gnutls?]: New variable.
Call `gnutls-derivation' when NEED-GNUTLS? is true, and add its output
to the `GUILE_LOAD_PATH' env. var. in that case.
* guix/build/download.scm (uri-abbreviation): New procedure.
(ftp-fetch, http-fetch): Use it instead of `uri->string' when calling
`progress-proc'. Reported by Andreas Enge.
* guix/build/gnu-build-system.scm (configure)[package-name]: New
procedure.
When LIBDIR is true and INCLUDEDIR is false, add
--includedir=LIBDIR/include.
Add support for --docdir when a "doc" output exists.
* guix/build/union.scm (delete-duplicate-leaves): New procedure.
(union-build)[leaf=?, resolve-collision]: New procedures.
Use `delete-duplicate-leaves' on the result of `tree-union'.
* tests/union.scm ("delete-duplicate-leaves, default",
"delete-duplicate-leaves, file names"): New tests.
* guix/build/download.scm (http-fetch): Rename `bv' to `bv-or-port'.
Use `http-get*' followed by `dump-port' when the former is available,
and pass a progress procedure to `dump-port'.
* guix/build/download.scm (progress-proc): New procedure.
(ftp-fetch): Call `ftp-size' on URI. Use `progress-proc', and pass
the result to `dump-port', along with #:buffer-size.
* guix/build/gnu-build-system.scm (patch-source-shebangs): Add a newline
after the "SHELL =" line in po/Makefile.in.in.
(%standard-phases): Move `patch-source-shebangs' after `patch'.
* guix/build/download.scm (open-connection-for-uri): Delete addrinfos
with the same address. Always open SOCK_STREAM/IPPROTO_IP sockets.
Fix the error handler's condition to determine what to do.
Reported by Nikita Karetnikov <nikita.karetnikov@gmail.com> at
<http://lists.gnu.org/archive/html/bug-guix/2012-12/msg00150.html>.
This allows many packages to build in a chroot that lacks /bin and
thus /bin/sh.
* guix/build/gnu-build-system.scm (patch-source-shebangs): New
procedure.
(%standard-phases): Add it.
* guix/build/utils.scm (executable-file?): New procedure.
* distro/packages/perl.scm (perl): Don't use /bin/sh to run `Configure'.
* guix/build/gnu-build-system.scm (configure): Add `inputs' keyword
parameter. Take Bash from there, falling back to /bin/sh. Set
`CONFIG_SHELL' and `SHELL' to that Bash. Run "bash ./configure"
instead of just "./configure".
* distro/packages/bootstrap.scm (%bootstrap-inputs): Add "bash".
* distro/packages/base.scm (gcc-boot0-wrapped): Use "bash" from
%BOOT1-INPUTS instead of /bin/sh.
* guix/download.scm (%mirrors): New variable. Mirror lists taken from
Nixpkgs.
(url-fetch): New `mirrors' keyword parameter.
[builder]: Pass it.
* guix/build/download.scm (url-fetch): New `mirrors' keyword parameter.
[maybe-expand-mirrors]: New procedure.
[uri]: Use it.
* guix/build/utils.scm (substitute*): Remove special syntax for
list-of-files; instead, check whether FILE is `list?' at run time.
* distro/packages/base.scm (gcc-4.7, %binutils-static): Adjust
accordingly.
* guix/build/http.scm (open-connection-for-uri): New procedure.
(http-fetch): Use it. Pass the result as a #:port argument to
`http-get'.
Add hack to modify the `set-port-encoding!' binding in (web response).
* guix/ftp-client.scm (ftp-open): Add optional `port' parameter,
defaulting to 21. When calling `getaddrinfo', convert PORT to a
string and pass AI_NUMERICSERV when PORT is a number.
* guix/build/gnu-build-system.scm (%parallel-job-count): New variable.
(build, check): Use it instead of $NIX_BUILD_CORES.
* guix-build.in (guix-build): Default to 0 for the #:build-cores option.
* guix/build/utils.scm (substitute): Do not pass the OUT to PROC; use
`list-matches' instead of `regexp-exec' and pass a list of matches to
PROC. Expect PROC to return a string, and output that. Fold over
RX+PROC in order. Use `(read-line p 'concat)' to include the trailing
delimiter in LINE.
(substitute*): Produce code to iterate over the matches, and return a
string, which includes anything from the original line that's in
between matches.
* distro/base.scm (gcc-4.7, glibc): Adjust accordingly: remove use
of (ice-9 regex) and `regexp-substitute/global'; return a string.
* guix/build/gnu-build-system.scm (set-paths): Add new `path-exclusions'
parameter; honor it.
* guix/build-system/gnu.scm (gnu-build): New `path-exclusions' keyword
parameter; pass it to BUILDER.
* distro/base.scm (gcc-4.7): Exclude "libc" from $LIBRARY_PATH.
* guix/build/gnu-build-system.scm (strip): New procedure.
(%standard-phases): Add it.
* guix/build-system/gnu.scm (gnu-build): New `strip-binaries?',
`strip-flags', and `strip-directories' keyword parameters. Pass them
to BUILDER.
* guix/build/utils.scm (patch-shebang): Add an optional `path'
parameter. Change SHEBANG-RX to match the whole interpreter file
name. Don't patch when BIN and CMD are the same. Add docstring.
* guix/build/gnu-build-system.scm (patch-shebangs): New procedure.
(%standard-phases): Add it.
* guix/build-system/gnu.scm (gnu-build): New `patch-shebangs?' keyword
parameter. Pass it to the builder's `gnu-build'.
* guix/build/utils.scm (substitute): Change to accept a `pattern+procs'
parameter. Iterate over it.
(substitute*): Adjust accordingly.
* distro/base.scm (guile-1.8): Adjust accordingly.
* guix/build/utils.scm (let-matches, substitute*): New macros.
* distro/base.scm (guile-1.8): Use `substitute*' instead of
`substitute'. Remove the #:modules argument.
* guix/build/gnu-build-system.scm (set-paths): Dump the value of
environment variables in the `environment-variables' files, similar to
what Nixpkgs does.
* guix/build/gnu-build-system.scm (patch): New procedure.
(%standard-phases): Add `patch'.
* guix/build-system/gnu.scm (gnu-build): Add `patches' and `patch-flags'
parameters. Pass them on.
* guix/build/gnu-build-system.scm (set-paths, build, check, install):
New procedures.
(unpack): Make `source' a keyword arg; add `#:allow-other-keys'.
(configure): Likewise.
(%standard-phases): New variable.
(gnu-build): Make `source', `outputs', and `inputs' keyword arguments;
add `phases' keyword argument; #:allow-other-keys; add rest arguments
`args'. Invoke each of PHASES in order within `every'.
* guix/gnu-build-system.scm (gnu-build): Add `make-flags' and `phases'
keyword arguments. Update builder's `gnu-build' call to match the new
convention.
* guix/derivations.scm (build-expression->derivation): Add all of INPUTS
as inputs to the final derivation.
* guix/build/gnu-build-system.scm, guix/build/utils.scm,
guix/gnu-build-system.scm: New files.
* tests/builders.scm ("gnu-build"): New test.
* guix/derivations.scm (imported-modules): New procedure.
(build-expression->derivation): New keyword argument `modules'.
Use `imported-modules' when MODULES is non-empty, and pass it with
`-L' to GUILE.
* guix/build/http.scm, guix/http.scm, tests/builders.scm: New files.
Ludovic Courtès