Fixes <https://bugs.gnu.org/34637>.
Reported by Martin Flack <martin.flack@gmail.com>.
Previously we'd fail to build the package cache for old versions of Guix
that lack 'guix repl'. Now we simply ignore the issue and keep going
without a cache.
* guix/inferior.scm (gexp->derivation-in-inferior): Add
#:silent-failure? and honor it.
[drop-extra-keyword]: New procedure.
Use it.
* guix/channels.scm (package-cache-file): Pass #:silent-failure? #t.
Previously the imported modules and extensions of EXP would be missing
from the load path of 'guix repl'.
* guix/inferior.scm (gexp->derivation-in-inferior)[script]: New
variable.
[trampoline]: Write (primitive-load #$script) to PIPE. Add #$output.
* tests/channels.scm ("channel-instances->manifest")[depends?]: Check
for requisites rather than direct references.
Adjust callers accordingly.
* guix/inferior.scm (inferior-eval-with-store): New procedure, with code
formerly in 'inferior-package-derivation'.
(inferior-package-derivation): Rewrite in terms of
'inferior-eval-with-store'.
* tests/inferior.scm ("inferior-eval-with-store"): New test.
* guix/inferior.scm (inferior-package->manifest-entry): New procedure.
* tests/inferior.scm (manifest-entry->list): New procedure.
("inferior-package->manifest-entry"): New test.
* guix/inferior.scm (<inferior>)[packages, table]: New fields.
(open-inferior): Initialize these new fields.
(inferior-packages): Rename to...
(%inferior-packages): ... this.
(inferior-packages): New procedure; force the promise.
(%inferior-package-table, lookup-inferior-packages): New procedures.
* tests/inferior.scm ("lookup-inferior-packages")
("lookup-inferior-packages and eq?-ness"): New tests.
* guix/inferior.scm (read-inferior-response)
(send-inferior-request): New procedures.
(inferior-eval): Rewrite in terms of these.
(proxy, inferior-package-derivation, inferior-package->derivation)
(package-compiler): New procedures.
* tests/inferior.scm ("inferior-package-derivation"): New test.
Ludovic Courtès