* doc/guix.texi (Invoking guix package): Explain where packages are
searched for and link to "Package Modules".
(Defining Packages) <example>: Use 'define-module' clause instead of
'use-modules'. Explain why and link to "Package Modules".
(Invoking guix build): Explain where packages aer searched for and
link to "Package Modules".
(Package Modules): Explain that (gnu packages ...) is scanned.
* guix/scripts/offload.scm (machine-lock-file, lock-machine,
unlock-machine): New procedures.
(with-machine-lock): New macro.
(process-request): Wrap 'send-files' and 'retrieve-files' calls in
'with-machine-lock'.
* tests/utils.scm (temp-file): New variable.
("fcntl-flock"): Rewrite to actually test whether the child process
waits for the lock to be released. The previous test was wrong
because (1) it expected F_SETLK semantics, not F_SETLKW, and (2) it
got EBADF because of a mismatch between the open mode and the lock
style.
* doc/guix.texi (Invoking guix package): Remove documentation for
--dry-run, --fallback, --no-substitutes, and --max-silent-time. Add a
cross-ref to "Invoking guix build".
(Invoking guix archive): Add "common build options" as the cross-ref
topic for "Invoking guix build".
(Invoking guix build): Move common build options separately. Add a
paragraph to explain.
* guix/http-client.scm (&http-get-error): New condition type.
(http-fetch): Raise it instead of using 'error'.
* guix/scripts/substitute-binary.scm (fetch) <http>: Wrap body into
'guard' form; gracefully handle 'http-get-error?' conditions.
* guix/scripts/offload.scm (machine-load, machine-less-loaded?,
machine-less-loaded-or-faster?): New procedures.
(choose-build-machine): Use 'machine-less-loaded-or-faster?' when
sorting. Return the head of MACHINES unless it's loaded is >= 2.
* guix/nar.scm (write-file) <directory>: Pass 'string<?' as the second
argument to 'scandir'.
* tests/nar.scm ("write-file puts file in C locale collation order"):
New test.
* guix/derivations.scm (<derivation-output>): Add 'recursive?' field.
Adjust 'make-derivation-output' callers.
(%read-derivation) <fixed-output>: When HASH-ALGO starts with 'r:',
set the 'recursive?' field and drop 'r:' from the hash algo name.
(write-derivation)[write-output]: Write the algo as 'r:HASH-ALGO' when
the RECURSIVE? field is set.
(derivation-hash) <fixed-output>: Prepend "r:" when RECURSIVE? is set.
(fixed-output-path): New procedure.
(derivation): Add #:recursive? parameter. Use 'fixed-output-path' to
compute the output file name of a fixed output derivation.
(build-expression->derivation): Add #:recursive? parameter. Pass it
to 'derivation'.
* tests/derivations.scm ("fixed-output derivation, recursive",
"build-expression->derivation produces recursive fixed-output",
"build-expression->derivation uses recursive fixed-output"): New
tests.
* doc/guix.texi (Derivations): Document #:recursive? for 'derivation'.
Add #:recursive? for 'build-expression->derivation'.
* guix/scripts/hash.scm (show-help): Add --recursive.
(%options): Likewise.
(guix-hash)[file-hash]: New procedure. Honor --recursive.
Use it.
* guix/nar.scm (write-file): Add missing field to the &nar-error
condition raised upon unsupported file type; change its message to be
more descriptive.
* tests/guix-hash.sh: Add tests with -r.
* doc/guix.texi (Invoking guix hash): Document --recursive.
