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services: qemu-binfmt: 'guix-support?' defaults to #t.

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* gnu/services/virtualization.scm (qemu-binfmt-service-type)[guix-support?]:
Change the default from #f to #t.
* doc/guix.texi (Transparent Emulation with QEMU): Change the default of
‘guix-support?’ from #f to #t.  Describe the implication of setting it to #f.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>
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Stefan 2021-01-07 21:44:22 +01:00 • committed by Ludovic Courtès
parent 2a333f2535
commit d4f5ea502d
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2 changed files with 6 additions and 2 deletions
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6
doc/guix.texi
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@ -27338,7 +27338,7 @@ This is the configuration for the @code{qemu-binfmt} service.
The list of emulated QEMU platforms. Each item must be a @dfn{platform The list of emulated QEMU platforms. Each item must be a @dfn{platform
object} as returned by @code{lookup-qemu-platforms} (see below). object} as returned by @code{lookup-qemu-platforms} (see below).
@item @code{guix-support?} (default: @code{#f}) @item @code{guix-support?} (default: @code{#t})
When it is true, QEMU and all its dependencies are added to the build When it is true, QEMU and all its dependencies are added to the build
environment of @command{guix-daemon} (@pxref{Invoking guix-daemon, environment of @command{guix-daemon} (@pxref{Invoking guix-daemon,
@option{--chroot-directory} option}). This allows the @code{binfmt_misc} @option{--chroot-directory} option}). This allows the @code{binfmt_misc}
@ -27367,6 +27367,10 @@ build}, transparently using QEMU to emulate the ARMv7 CPU. Pretty handy
if you'd like to test a package build for an architecture you don't have if you'd like to test a package build for an architecture you don't have
access to! access to!
When @code{guix-support?} is set to @code{#f}, programs for other
architectures can still be executed transparently, but invoking commands
like @command{guix build -s armhf-linux @dots{}} will fail.
@item @code{qemu} (default: @code{qemu}) @item @code{qemu} (default: @code{qemu})
The QEMU package to use. The QEMU package to use.
@end table @end table

2
gnu/services/virtualization.scm
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@ -717,7 +717,7 @@ potential infinite waits blocking libvirt."))
(platforms qemu-binfmt-configuration-platforms (platforms qemu-binfmt-configuration-platforms
(default '())) ;safest default (default '())) ;safest default
(guix-support? qemu-binfmt-configuration-guix-support? (guix-support? qemu-binfmt-configuration-guix-support?
(default #f))) (default #t)))
(define (qemu-platform->binfmt qemu platform) (define (qemu-platform->binfmt qemu platform)
"Return a gexp that evaluates to a binfmt string for PLATFORM, using the "Return a gexp that evaluates to a binfmt string for PLATFORM, using the