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This is a service designed to provide information about Guix. At the
moment, this initial prototype gathers up information about packages,
the associated metadata and derivations.

The initial primary use case is to compare two different revisions of
Guix, detecting which packages are new, no longer present, updated or
otherwise different.

It's based on the Mumi project.

[1]: https://git.elephly.net/software/mumi.git
This commit is contained in:
Christopher Baines 2019-02-06 16:14:44 +00:00
commit 5a9262b38d
Signed by: cbaines
GPG key ID: 5E28A33B0B84F577
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guix-data-service/model/derivation.scm Normal file
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(define-module (guix-data-service model derivation)
#:use-module (srfi srfi-1)
#:use-module (ice-9 vlist)
#:use-module (squee)
#:use-module (guix inferior)
#:use-module (guix derivations)
#:use-module (guix-data-service model utils)
#:export (select-existing-derivations
insert-into-derivations
inferior-packages->derivation-ids))
(define (select-existing-derivations file-names)
(string-append "SELECT id, file_name "
"FROM derivations "
"WHERE file_name IN "
"(" (string-join (map (lambda (file-name)
(simple-format #f "'~A'" file-name))
file-names)
",")
");"))
(define (insert-into-derivations file-names)
(string-append "INSERT INTO derivations (file_name) VALUES "
(string-join
(map
(lambda (file-name)
(simple-format #f "('~A')" file-name))
file-names)
",")
" RETURNING id"
";"))
(define (inferior-packages->derivation-ids store conn inferior-packages)
(let* ((package-derivation-file-names (map (lambda (package)
(derivation-file-name
(inferior-package-derivation
store package)))
inferior-packages))
(existing-derivation-entries (exec-query->vhash
conn
(select-existing-derivations
package-derivation-file-names)
second ;; file_name
first)) ;; id
(missing-derivation-file-names
(filter (lambda (file-name)
(not (vhash-assoc file-name
existing-derivation-entries)))
package-derivation-file-names))
(new-derivation-entries
(if (null? missing-derivation-file-names)
'()
(map car
(exec-query
conn
(insert-into-derivations
missing-derivation-file-names)))))
(new-entries-id-lookup-vhash
(two-lists->vhash missing-derivation-file-names
new-derivation-entries)))
(map (lambda (derivation-file-name)
(cdr
(or (vhash-assoc derivation-file-name
existing-derivation-entries)
(vhash-assoc derivation-file-name
new-entries-id-lookup-vhash)
(error "missing derivation id"))))
package-derivation-file-names)))