Start storing channel instance derivations

These are the ones that relate to Guix pull.

Makefile.am

@@ -76,6 +76,7 @@ SOURCES =									\
   guix-data-service/model/build-server-token-seed.scm				\
   guix-data-service/model/build-status.scm					\
   guix-data-service/model/build.scm						\
+  guix-data-service/model/channel-instance.scm					\
   guix-data-service/model/channel-news.scm					\
   guix-data-service/model/derivation.scm					\
   guix-data-service/model/git-branch.scm					\

guix-data-service/jobs/load-new-guix-revision.scm

@@ -35,6 +35,7 @@
   #:use-module (guix-data-service config)
   #:use-module (guix-data-service database)
   #:use-module (guix-data-service model build)
+  #:use-module (guix-data-service model channel-instance)
   #:use-module (guix-data-service model channel-news)
   #:use-module (guix-data-service model package)
   #:use-module (guix-data-service model package-derivation-by-guix-revision-range)
@@ -1206,6 +1207,17 @@ ORDER BY packages.name, packages.version"
            guix-revision-id
            (extract-information-from conn guix-revision-id
                                      commit store-item)
+           (insert-channel-instances conn
+                                     guix-revision-id
+                                     (filter-map
+                                      (match-lambda
+                                        ((system . derivations)
+                                         (and=>
+                                          (assoc-ref derivations
+                                                     'manifest-entry-item)
+                                          (lambda (drv)
+                                            (cons system drv)))))
+                                      channel-derivations-by-system))
            (if (defined? 'channel-news-for-commit
                  (resolve-module '(guix channels)))
                (log-time

guix-data-service/model/channel-instance.scm

@@ -0,0 +1,52 @@
+;;; Guix Data Service -- Information about Guix over time
+;;; Copyright © 2020 Christopher Baines <mail@cbaines.net>
+;;;
+;;; This program is free software: you can redistribute it and/or
+;;; modify it under the terms of the GNU Affero General Public License
+;;; as published by the Free Software Foundation, either version 3 of
+;;; the License, or (at your option) any later version.
+;;;
+;;; This program is distributed in the hope that it will be useful,
+;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; Affero General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU Affero General Public
+;;; License along with this program.  If not, see
+;;; <http://www.gnu.org/licenses/>.
+
+(define-module (guix-data-service model channel-instance)
+  #:use-module (srfi srfi-1)
+  #:use-module (ice-9 match)
+  #:use-module (squee)
+  #:use-module (json)
+  #:use-module (guix utils)
+  #:use-module (guix-data-service model utils)
+  #:use-module (guix-data-service model derivation)
+  #:export (insert-channel-instances))
+
+(define (insert-channel-instances conn
+                                  guix-revision-id
+                                  derivations-by-system)
+  (let ((derivation-ids
+         (derivation-file-names->derivation-ids
+          conn
+          (map cdr derivations-by-system))))
+
+    (exec-query
+     conn
+     (string-append
+      "
+INSERT INTO channel_instances
+  (guix_revision_id, system, derivation_id)
+VALUES "
+      (string-join
+       (map (lambda (system derivation-id)
+              (simple-format #f "(~A, '~A', ~A)"
+                             guix-revision-id
+                             system
+                             derivation-id))
+            (map car derivations-by-system)
+            derivation-ids)
+       ", "))))
+  #t)

sqitch/deploy/channel_instance_derivations.sql

@@ -0,0 +1,13 @@
+-- Deploy guix-data-service:channel_instance_derivations to pg
+
+BEGIN;
+
+CREATE TABLE channel_instances (
+  guix_revision_id integer NOT NULL REFERENCES guix_revisions(id),
+  system varchar NOT NULL,
+  derivation_id integer NOT NULL REFERENCES derivations (id),
+  PRIMARY KEY (guix_revision_id, system),
+  UNIQUE (derivation_id)
+);
+
+COMMIT;

sqitch/revert/channel_instance_derivations.sql

@@ -0,0 +1,7 @@
+-- Revert guix-data-service:channel_instance_derivations from pg
+
+BEGIN;
+
+DROP TABLE channel_instances;
+
+COMMIT;

sqitch/sqitch.plan

@@ -49,3 +49,4 @@ remove_old_cross_derivations 2020-02-07T19:42:54Z Christopher Baines <mail@cbain
 increase_fillfactor_for_some_indexes 2020-02-07T20:49:17Z Christopher Baines <mail@cbaines.net> # Increase the fillfactor for some btree indexes
 change_package_derivations_by_guix_revision_range_target 2020-02-08T10:13:07Z Christopher Baines <mail@cbaines.net> # Change the values for package_derivations_by_guix_revision_range target
 allow_including_and_excluding_branches_for_repositories 2020-02-08T11:30:02Z Christopher Baines <mail@cbaines.net> # Allow including and excluding branches for repositories
+channel_instance_derivations 2020-02-10T07:59:03Z Christopher Baines <mail@cbaines.net> # Add tables to store derivations for channel instances

sqitch/verify/channel_instance_derivations.sql

@@ -0,0 +1,7 @@
+-- Verify guix-data-service:channel_instance_derivations on pg
+
+BEGIN;
+
+-- XXX Add verifications here.
+
+ROLLBACK;

tests/jobs-load-new-guix-revision.scm

@@ -44,18 +44,24 @@
            #t))
 
         (mock
-         ((guix channels)
+         ((guix-data-service model channel-instance)
-          channel-news-for-commit
+          insert-channel-instances
-          (lambda (channel commit)
+          (lambda (conn guix-revision-id derivations-by-system)
-            '()))
+            #t))
 
-         (match (enqueue-load-new-guix-revision-job
+         (mock
-                 conn
+          ((guix channels)
-                 (git-repository-url->git-repository-id conn "test-url")
+           channel-news-for-commit
-                 "test-commit"
+           (lambda (channel commit)
-                 "test-source")
+             '()))
-           ((id)
+
-            (process-load-new-guix-revision-job id))))))))
+          (match (enqueue-load-new-guix-revision-job
+                  conn
+                  (git-repository-url->git-repository-id conn "test-url")
+                  "test-commit"
+                  "test-source")
+            ((id)
+             (process-load-new-guix-revision-job id)))))))))
 
    (exec-query conn "TRUNCATE guix_revisions CASCADE")
    (exec-query conn "TRUNCATE load_new_guix_revision_jobs CASCADE")