gnu: libcdio-paranoia: Update to 10.2+0.94.2.

* gnu/packages/cdrom.scm (libcdio-paranoia): Update to 10.2+0.94.2.

gnu: libcdio: Update to 2.0.0.

* gnu/packages/cdrom.scm (libcdio): Update to 2.0.0.

services: qemu-binfmt: Extend guix-daemon with extra chroot directories.

Fixes <https://bugs.gnu.org/20239>.

* gnu/services/virtualization.scm (<qemu-binfmt-configuration>)[guix-support?]:
New field.
(qemu-binfmt-guix-chroot): New procedure.
(qemu-binfmt-service-type)[extensions]: Add GUIX-SERVICE-TYPE.
* doc/guix.texi (Virtualization Services): Document 'guix-support?'.
(Additional Build Options): Mention binfmt_misc and offloading under
'--system'.

services: guix: Add 'chroot-directories' field.

* gnu/services/base.scm (<guix-configuration>)[chroot-directories]: New
field.
(guix-shepherd-service): Honor it.
(references-file): New procedure.
(guix-service-type)[compose, extend]: New fields.

services: Add qemu-binfmt.

* gnu/services/virtualization.scm (<qemu-platform>): New record type.
(bv): New macro.
(%i386, %i486, %alpha, %arm, %armeb, %sparc, %sparc32plus)
(%ppc, %ppc64, %ppc64le, %m68k, %mips, %mipsel, %mipsn32el)
(%mips64, %mips64el, %sh4, %sh4eb, %s390x, %aarch64, %hppa)
(%qemu-platforms): New variables.
(lookup-qemu-platforms): New procedure.
(<qemu-binfmt-configuration>): New record type.
(qemu-platform->binfmt): New procedures.
(%binfmt-mount-point, %binfmt-register-file, %binfmt-file-system)
(qemu-binfmt-service-type): New variables.
(qemu-binfmt-shepherd-services): New procedures.
* doc/guix.texi (Virtualization Services): Add "Transparent Emulation
with QEMU" heading.

binfmt fixlet

gnu: guile-bytestructures: Update to 1.0.1.

* gnu/package/guile.scm (guile-bytestructures): Update to 1.0.1.
[source]: Use tarball from github instead of git.
[build-system]: Use GNU-BUILD-SYSTEM.
[arguments]: Remove.
[navitve-inputs]: Add PKG-CONFIG.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: guix: Update snapshot to 3c5dbd2.

* gnu/packages/package-management.scm (guix): Update to 3c5dbd2.

gnu: Add sound-juicer.

* gnu/packages/gnome.scm (sound-juicer): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: Add libmusicbrainz.

* gnu/packages/music.scm (libmusicbrainz): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: Add libdiscid.

* gnu/packages/music.scm (libdiscid): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

daemon: Always try to execute the builder regardless of the platform.

* nix/libstore/build.cc (runChild): Move platform check after 'execve'
call.  Check specifically for ENOEXEC.

gnu: inkscape: Use HTTPS for home page.

* gnu/packages/inkscape.scm (inkscape)[home-page]: Use HTTPS.

gnu: inkscape: Update to 0.92.2.

* gnu/packages/inkscape.scm (inkscape): Update to 0.92.2.

gnu: newsbeuter: Deprecate in favour of newsboat.

* gnu/packages/syndication.scm (newsbeuter): Redefine using
‘deprecated-package’.
* gnu/packages/patches/newsbeuter-CVE-2017-12904.patch: Delete file.
* gnu/packages/patches/newsbeuter-CVE-2017-14500.patch: Likewise.
* gnu/local.mk (dist_patch_DATA): Remove both.

derivations: Fix typo in docstring.

* guix/derivations.scm (derivation-prerequisites): Fix typo in docstring.

ssh: Pass an empty "exceptfds" set to 'select'.

Previously the redirect code could end up exiting prematurely because of
an uninteresting "exceptional condition" on the socket (info "(libc)
Waiting for I/O").

* guix/ssh.scm (remote-daemon-channel): Pass the empty list as the third
argument to 'select'.  It was a mistake to pass a non-empty list there
in the first place.

doc: Fix typo in 'guix environment' example.

* doc/guix.texi (Invoking guix environment): Add missing @ in example.

store: Fix potential over-reads in 'import-paths'.

Previously 'process-stderr' would always pass a bytevector of MAX-LEN to
then daemon in the %stderr-read case (i.e., 'import-paths'), instead of
LEN (where LEN <= MAX-LEN).

In practice the extra bytes didn't cause a protocol violation or
anything because they happen at the end of the stream, which typically
contains the canonical sexp of the signature, and the extra zeros were
just ignored.

* guix/serialization.scm (write-bytevector): Add optional 'l' parameter
and honor it.
* guix/store.scm (process-stderr): Pass LEN to 'write-bytevector'.

ssh: Work around 'get-bytevector-some' bug.

This works around <https://bugs.gnu.org/30066> and noticeably improves
performance when using GUIX_DAEMON_SOCKET=ssh://HOST (the redirect code
was transferring data to guix-daemon one byte at a time!).

* guix/ssh.scm (remote-daemon-channel)[redirect]: Define 'read!' and use
it instead of 'get-bytevector-some'.

gnu: rrdtool: Update to 1.7.0.

* gnu/packages/rrdtool.scm (rrdtool): Update to 1.7.0.
[native-inputs]: Add bc, perl, and tzdata.
[arguments]: Remove obsolete substitution in ‘pre-configure’ phase.
Set TZDIR for tests in new ‘prepare-test-environment’ phase.
Add ‘remove-native-input-references’ phase for example scripts.