Fixes <http://bugs.gnu.org/18534>.
* guix/scripts/pull.scm (with-environment-variable, with-PATH): New
macros.
(temporary-directory, first-directory, interned-then-deleted): New
procedures.
(unpack): Rewrite to do the unpacking in the current process rather
than as a separate derivation.
(%self-build-file): New variable.
(build-from-source): New procedure.
(build-and-install): Use it.
* guix/build/pull.scm (build-guix): Rename 'tarball' argument to
'source'. Remove #:tar and #:gzip parameters, as well as 'tar'
invocation. Remove 'scandir' invocation. Wrap body in
'with-directory-excursion'.
* build-aux/build-self.scm: New file.
* Makefile.am (EXTRA_DIST): Add it.
* guix/gexp.scm (gexp->derivation): Add #:module-path parameter, and
pass it to 'imported-modules' and 'compiled-modules'.
* doc/guix.texi (G-Expressions): Adjust accordingly.
* gnu/system/grub.scm (<grub-image>, <grub-theme>): New record types.
(%artwork-repository, %background-image): New variables.
(<grub-configuration>)[theme]: New field.
(svg->png, resize-image, grub-background-image, eye-candy): New
procedures.
(grub-configuration-file): Use 'eye-candy' and add it in BUILDER.
* gnu/system/vm.scm (system-qemu-image/shared-store-script): Add "$@" at
the end of the script.
(common-qemu-options): Remove trailing newline.
* doc/guix.texi (Invoking guix system): Document it.
* gnu/system/vm.scm (system-qemu-image/shared-store): Add
#:disk-image-size and #:full-boot? parameters and honor them. Pass
'#:copy-inputs? full-boot?', and change #:inputs argument.
* guix/scripts/system.scm (system-derivation-for-action): Pass
#:disk-image-size to 'system-qemu-image/shared-store'.
* doc/guix.texi (Invoking guix system): Mention use of '--image-size' in
conjunction with '--full-boot'.
* guix/scripts/lint.scm (starts-with-abbreviation?): New procedure.
(check-synopsis-style)[check-start-with-package-name]: Use it.
* tests/lint.scm ("synopsis: start with abbreviation"): New test.
* guix/scripts/lint.scm (package-name-regexp): New procedure.
(check-synopsis-style)[check-start-with-package-name]: Use it instead
of 'string-prefix-ci?'.
* tests/lint.scm ("synopsis: start with package name prefix"): New test.
* tests/lint.scm ("description: may start with a digit"): Replace
(not (string-contains exp str)) with (string-null? exp).
("description: may start with lower-case package name"): Likewise.
("description: end-of-sentence detection with abbreviations"):
Likewise.
("synopsis: may start with a digit"): Likewise.
("synopsis: ends with 'etc.'"): Likewise.
* gnu/services/xorg.scm (xorg-start-command): Add #:drivers parameter.
Add 'device-section' procedure, and use it in 'xserver.conf'.
* doc/guix.texi (X Window): Document it.
* gnu/packages/xorg.scm (xf86-video-modesetting): New variable.
* gnu/services/xorg.scm (xorg-start-command)[xserver.conf]: Add
ModulePath line for XF86-VIDEO-MODESETTING, commented out.
Note: some of these changes undo bits of 35b9e4232.
* gnu/packages/base.scm, gnu/packages/gperf.scm, gnu/packages/guile.scm,
gnu/packages/libidn.scm, gnu/packages/miscfiles.scm,
gnu/packages/telephony.scm: Adjust synopses and descriptions as
suggested by 'make sync-descriptions'.
* gnu/services/base.scm (user-processes-service): Increase the default
value of 'grace-delay'. This leaves more time for processes to clean
up their PID files, /tmp/.X0-lock, etc.
