Track package replacements

Start at least looking for package replacements, and storing the
details (particularly the derivation). I'm looking at doing this so that build
servers using the Guix Data Service can build these derivations.

3 files changed, 71 insertions, 12 deletions

diff --git a/guix-data-service/jobs/load-new-guix-revision.scm b/guix-data-service/jobs/load-new-guix-revision.scm
index a25e3f9..15ca098 100644
--- a/guix-data-service/jobs/load-new-guix-revision.scm
+++ b/guix-data-service/jobs/load-new-guix-revision.scm
@@ -39,6 +39,7 @@
   #:use-module (guix-data-service config)
   #:use-module (guix-data-service database)
   #:use-module (guix-data-service utils)
+  #:use-module (guix-data-service model utils)
   #:use-module (guix-data-service model build)
   #:use-module (guix-data-service model channel-instance)
   #:use-module (guix-data-service model channel-news)
@@ -765,7 +766,34 @@ WHERE job_id = $1")
                  (string<? a-name
                            b-name)))))))
 
-(define (insert-packages conn inf packages)
+(define (inferior-packages-plus-replacements inf)
+  (let* ((packages
+          ;; This isn't perfect, sometimes there can be two packages with the
+          ;; same name and version, but different derivations.  Guix will warn
+          ;; about this case though, generally this means only one of the
+          ;; packages should be exported.
+          (deduplicate-inferior-packages
+           (inferior-packages inf)))
+         (replacements (filter-map inferior-package-replacement packages))
+
+         (package-id-hash-table (make-hash-table)))
+
+    (for-each (lambda (pkg)
+                (hash-set! package-id-hash-table
+                           (inferior-package-id pkg)
+                           #t))
+              packages)
+
+    (let ((non-exported-replacements
+           (filter (lambda (pkg)
+                     (eq? #f
+                          (hash-ref package-id-hash-table
+                                    (inferior-package-id pkg))))
+                   replacements)))
+
+      (append packages non-exported-replacements))))
+
+(define* (insert-packages conn inf packages #:key (process-replacements? #t))
   (let* ((package-license-set-ids
           (with-time-logging "fetching inferior package license metadata"
             (inferior-packages->license-set-ids
@@ -777,7 +805,24 @@ WHERE job_id = $1")
         (((all-package-metadata-ids new-package-metadata-ids)
            (with-time-logging "fetching inferior package metadata"
              (inferior-packages->package-metadata-ids
-              conn inf packages package-license-set-ids))))
+              conn inf packages package-license-set-ids)))
+         ((package-replacement-package-ids)
+          (map (lambda (package)
+                 (let ((replacement (inferior-package-replacement package)))
+                   (if (and process-replacements? replacement)
+                       ;; I'm not sure if replacements can themselves be
+                       ;; replaced, but I do know for sure that there are
+                       ;; infinite chains of replacements (python(2)-urllib3
+                       ;; in 7c4c781aa40c42d4cd10b8d9482199f3db345e1b for
+                       ;; example).
+                       ;;
+                       ;; This code currently just capures the first level of
+                       ;; replacements
+                       (car
+                        (insert-packages conn inf (list replacement)
+                                         #:process-replacements? #f))
+                       (cons "integer" NULL))))
+               packages)))
 
       (unless (null? new-package-metadata-ids)
         (with-time-logging "fetching package metadata tsvector entries"
@@ -789,7 +834,8 @@ WHERE job_id = $1")
          conn
          (zip (map inferior-package-name packages)
               (map inferior-package-version packages)
-              all-package-metadata-ids))))))
+              all-package-metadata-ids
+              package-replacement-package-ids))))))
 
 (define (insert-lint-warnings conn inferior-package-id->package-database-id
                               lint-checker-ids
@@ -1201,8 +1247,7 @@ WHERE job_id = $1")
       (lambda ()
         (let* ((packages
                 (with-time-logging "fetching inferior packages"
-                  (deduplicate-inferior-packages
-                   (inferior-packages inf))))
+                  (inferior-packages-plus-replacements inf)))
                (inferior-lint-warnings
                 (with-time-logging "fetching inferior lint warnings"
                   (all-inferior-lint-warnings inf store packages)))
diff --git a/guix-data-service/model/package-metadata.scm b/guix-data-service/model/package-metadata.scm
index d7de893..912d0c2 100644
--- a/guix-data-service/model/package-metadata.scm
+++ b/guix-data-service/model/package-metadata.scm
@@ -109,9 +109,16 @@
                        fields)
                   " AND ")))
 
-(define (select-package-metadata-by-revision-name-and-version
-         conn revision-commit-hash name version locale)
-  (define query "
+(define* (select-package-metadata-by-revision-name-and-version
+          conn
+          revision-commit-hash
+          name
+          version
+          locale
+          #:key replacement?)
+  (define query
+    (string-append
+     "
 SELECT translated_package_synopsis.synopsis, translated_package_synopsis.locale,
   translated_package_descriptions.description, translated_package_descriptions.locale,
   package_metadata.home_page,
@@ -179,7 +186,12 @@ WHERE packages.id IN (
   WHERE guix_revisions.commit = $1
 )
   AND packages.name = $2
-  AND packages.version = $3")
+  AND packages.version = $3"
+     (if replacement?
+         "
+  AND packages.replacement_package_id IS NOT NULL"
+         "
+  AND packages.replacement_package_id IS NULL")))
 
   (map
    (match-lambda
diff --git a/guix-data-service/model/package.scm b/guix-data-service/model/package.scm
index 813d820..97deefc 100644
--- a/guix-data-service/model/package.scm
+++ b/guix-data-service/model/package.scm
@@ -162,7 +162,9 @@ WITH revision_packages AS (
     WHERE guix_revisions.commit = $1
   )
 ), search_results AS (
-  SELECT DISTINCT ON (packages.name) packages.name,
+  SELECT DISTINCT ON
+           (packages.name, packages.version, packages.replacement_package_id)
+         packages.name,
          packages.version, package_synopsis.synopsis,
          package_synopsis.locale AS synopsis_locale,
          package_descriptions.description,
@@ -195,7 +197,7 @@ WITH revision_packages AS (
     OR
     package_metadata_tsvectors.synopsis_and_description @@ plainto_tsquery($2)
   )
-  ORDER BY name,
+  ORDER BY name, packages.version, packages.replacement_package_id,
     CASE WHEN package_metadata_tsvectors.locale = 'en_US.UTF-8' THEN 2
          WHEN package_metadata_tsvectors.locale = $3 THEN 1
          ELSE 0
@@ -265,7 +267,7 @@ RETURNING id"))
   (insert-missing-data-and-return-all-ids
    conn
    "packages"
-   '(name version package_metadata_id)
+   '(name version package_metadata_id replacement_package_id)
    package-entries))
 
 (define (select-package-versions-for-revision conn