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[bug#40993] cuirass: Add build products download support.


From: Mathieu Othacehe
Subject: [bug#40993] cuirass: Add build products download support.
Date: Fri, 01 May 2020 10:54:56 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)

Hello,

Here's a patch adding support for build products downloading in
Cuirass. It is inspired by a similar mechanism in Hydra.

Attached a screenshot of what I obtained with the following
specification:

--8<---------------cut here---------------start------------->8---
(define hello-master
  '((#:name . "guix-master")
    (#:load-path-inputs . ())
    (#:package-path-inputs . ())
    (#:proc-input . "guix")
    (#:proc-file . "build-aux/cuirass/gnu-system.scm")
    (#:proc . cuirass-jobs)
    (#:proc-args (subset . "all"))
    (#:inputs . (((#:name . "guix")
                  (#:url . "https://gitlab.com/mothacehe/guix";)
                  (#:load-path . ".")
                  (#:branch . "master")
                  (#:no-compile? . #t))))
    (#:build-outputs . (((#:job . "iso9660-image*")
                         (#:type . "iso")
                         (#:output . "out")
                         (#:path . ""))))))

(list hello-master)
--8<---------------cut here---------------end--------------->8---

Thanks,

Mathieu

>From dbb78929d7c8aa3b9007660795f55232ab47dbfb Mon Sep 17 00:00:00 2001
From: Mathieu Othacehe <address@hidden>
Date: Fri, 1 May 2020 10:32:18 +0200
Subject: [PATCH] Add support for build products downloading.

* src/sql/upgrade-7.sql: New file.
* Makefile.am: Add it.
* src/cuirass/base.scm (create-build-outputs): New procedure,
(build-packages): call it,
(process-spec): add the new spec argument and pass it to create-build-outputs.
* src/cuirass/database.scm (db-add-build-product, db-get-build-product-path,
db-get-build-products): New exported procedures.
* src/cuirass/http.scm (respond-static-file): Move file sending to ...
(respond-file): ... this new procedure,
(url-handler): add a new "download/<id>" route, serving the requested file
with the new respond-file procedure. Also gather build products and pass them
to "build-details" for "build/<id>/details" route.
* src/cuirass/templates.scm (build-details): Honor the new "products" argument
to display all the build products associated to the given build.
* src/schema.sql (BuildProducts): New table,
(Specifications)[build_outputs]: new field.
* tests/database.scm: Add empty build-outputs spec.
* tests/http.scm: Ditto.
* examples/guix-jobs.scm: Ditto.
* examples/hello-git.scm: Ditto.
* examples/hello-singleton.scm: Ditto.
* examples/hello-subset.scm: Ditto.
* examples/random.scm: Ditto.
* doc/cuirass.texi (overview): Document it.
---
 Makefile.am                  |  4 ++-
 doc/cuirass.texi             | 14 +++++++--
 examples/guix-jobs.scm       |  4 ++-
 examples/hello-git.scm       |  4 ++-
 examples/hello-singleton.scm |  4 ++-
 examples/hello-subset.scm    |  4 ++-
 examples/random.scm          |  4 ++-
 src/cuirass/base.scm         | 44 ++++++++++++++++++++++++++--
 src/cuirass/database.scm     | 57 ++++++++++++++++++++++++++++++++----
 src/cuirass/http.scm         | 36 +++++++++++++++++------
 src/cuirass/templates.scm    | 37 +++++++++++++++++++++--
 src/schema.sql               | 13 +++++++-
 src/sql/upgrade-7.sql        | 15 ++++++++++
 tests/database.scm           |  4 ++-
 tests/http.scm               |  5 ++--
 15 files changed, 218 insertions(+), 31 deletions(-)
 create mode 100644 src/sql/upgrade-7.sql

diff --git a/Makefile.am b/Makefile.am
index 65c9a29..f4a3663 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -5,6 +5,7 @@
 # Copyright © 2018 Ludovic Courtès <address@hidden>
 # Copyright © 2018 Clément Lassieur <address@hidden>
 # Copyright © 2018 Tatiana Sholokhova <address@hidden>
+# Copyright © 2020 Mathieu Othacehe <address@hidden>
 #
 # This file is part of Cuirass.
 #
@@ -71,7 +72,8 @@ dist_sql_DATA =                               \
   src/sql/upgrade-3.sql                                \
   src/sql/upgrade-4.sql                                \
   src/sql/upgrade-5.sql                                \
-  src/sql/upgrade-6.sql
+  src/sql/upgrade-6.sql                        \
+  src/sql/upgrade-7.sql
 
 dist_css_DATA =                                        \
   src/static/css/cuirass.css                   \
diff --git a/doc/cuirass.texi b/doc/cuirass.texi
index e652e8d..c6f64c9 100644
--- a/doc/cuirass.texi
+++ b/doc/cuirass.texi
@@ -11,7 +11,7 @@ This manual is for Cuirass version @value{VERSION}, a build 
automation
 server.
 
 Copyright @copyright{} 2016, 2017 Mathieu Lirzin@*
-Copyright @copyright{} 2017 Mathieu Othacehe@*
+Copyright @copyright{} 2017, 2020 Mathieu Othacehe@*
 Copyright @copyright{} 2018 Ludovic Courtès@*
 Copyright @copyright{} 2018 Clément Lassieur
 
@@ -137,7 +137,12 @@ a specification might look like:
                  (#:url . "git://my-custom-packages.git")
                  (#:load-path . ".")
                  (#:branch . "master")
-                 (#:no-compile? . #t)))))
+                 (#:no-compile? . #t))))
+   (#:build-outputs .
+    (((#:job . "hello*")
+      (#:type . "license")
+      (#:output . "out")
+      (#:path . "share/doc/hello-2.10/COPYING")))))
 @end lisp
 
 In this specification the keys are Scheme keywords which have the nice
@@ -150,6 +155,11 @@ containing the custom packages (see 
@code{GUIX_PACKAGE_PATH}).
 @code{#:load-path-inputs}, @code{#:package-path-inputs} and
 @code{#:proc-input} refer to these inputs by their name.
 
+The @code{#:build-outputs} list specifies the files that will be made
+available for download, through the Web interface. Here, the
+@code{COPYING} file, in the @code{"out"} output, for all jobs whose name
+matches @code{"hello*"} regex.
+
 @quotation Note
 @c This refers to
 @c 
<https://github.com/libgit2/libgit2sharp/issues/1094#issuecomment-112306072>.
diff --git a/examples/guix-jobs.scm b/examples/guix-jobs.scm
index 963c7ff..2f1f1a2 100644
--- a/examples/guix-jobs.scm
+++ b/examples/guix-jobs.scm
@@ -1,6 +1,7 @@
 ;;; guix-jobs.scm -- job specification test for Guix
 ;;; Copyright © 2016 Mathieu Lirzin <address@hidden>
 ;;; Copyright © 2018 Clément Lassieur <address@hidden>
+;;; Copyright © 2020 Mathieu Othacehe <address@hidden>
 ;;;
 ;;; This file is part of Cuirass.
 ;;;
@@ -34,7 +35,8 @@
                   (#:url . 
"https://git.savannah.gnu.org/git/guix/guix-cuirass.git";)
                   (#:load-path . ".")
                   (#:branch . "master")
-                  (#:no-compile? . #t))))))
+                  (#:no-compile? . #t))))
+    (#:build-outputs . ())))
 
 (define guix-master
   (job-base #:branch "master"))
diff --git a/examples/hello-git.scm b/examples/hello-git.scm
index 6468452..c5e2ca2 100644
--- a/examples/hello-git.scm
+++ b/examples/hello-git.scm
@@ -2,6 +2,7 @@
 ;;; Copyright © 2016 Mathieu Lirzin <address@hidden>
 ;;; Copyright © 2016 Jan Nieuwenhuizen <address@hidden>
 ;;; Copyright © 2018 Clément Lassieur <address@hidden>
+;;; Copyright © 2020 Mathieu Othacehe <address@hidden>
 ;;;
 ;;; This file is part of Cuirass.
 ;;;
@@ -43,4 +44,5 @@
                    (#:url . ,(string-append "file://" top-srcdir))
                    (#:load-path . ".")
                    (#:branch . "master")
-                   (#:no-compile? . #t)))))))
+                   (#:no-compile? . #t))))
+     (#:build-outputs . ()))))
diff --git a/examples/hello-singleton.scm b/examples/hello-singleton.scm
index a39191f..2d2d746 100644
--- a/examples/hello-singleton.scm
+++ b/examples/hello-singleton.scm
@@ -1,6 +1,7 @@
 ;;; hello-singleton.scm -- job specification test for hello in master
 ;;; Copyright © 2016 Mathieu Lirzin <address@hidden>
 ;;; Copyright © 2018 Clément Lassieur <address@hidden>
+;;; Copyright © 2020 Mathieu Othacehe <address@hidden>
 ;;;
 ;;; This file is part of Cuirass.
 ;;;
@@ -34,6 +35,7 @@
                   (#:url . 
"https://git.savannah.gnu.org/git/guix/guix-cuirass.git";)
                   (#:load-path . ".")
                   (#:branch . "master")
-                  (#:no-compile? . #t))))))
+                  (#:no-compile? . #t))))
+    (#:build-outputs . ())))
 
 (list hello-master)
diff --git a/examples/hello-subset.scm b/examples/hello-subset.scm
index 8c0d990..e86668e 100644
--- a/examples/hello-subset.scm
+++ b/examples/hello-subset.scm
@@ -1,6 +1,7 @@
 ;;; hello-subset.scm -- job specification test for hello subset
 ;;; Copyright © 2016 Mathieu Lirzin <address@hidden>
 ;;; Copyright © 2018 Clément Lassieur <address@hidden>
+;;; Copyright © 2020 Mathieu Othacehe <address@hidden>
 ;;;
 ;;; This file is part of Cuirass.
 ;;;
@@ -34,7 +35,8 @@
                   (#:url . 
"https://git.savannah.gnu.org/git/guix/guix-cuirass.git";)
                   (#:load-path . ".")
                   (#:branch . "master")
-                  (#:no-compile? . #t))))))
+                  (#:no-compile? . #t))))
+    (#:build-outputs . ())))
 
 (define guix-master
   (job-base #:branch "master"))
diff --git a/examples/random.scm b/examples/random.scm
index 37b97a2..f15e158 100644
--- a/examples/random.scm
+++ b/examples/random.scm
@@ -1,6 +1,7 @@
 ;;; random.scm -- Job specification that creates random build jobs
 ;;; Copyright © 2018 Ludovic Courtès <address@hidden>
 ;;; Copyright © 2018 Clément Lassieur <address@hidden>
+;;; Copyright © 2020 Mathieu Othacehe <address@hidden>
 ;;;
 ;;; This file is part of Cuirass.
 ;;;
@@ -31,4 +32,5 @@
                    (#:url . ,(string-append "file://" top-srcdir))
                    (#:load-path . ".")
                    (#:branch . "master")
-                   (#:no-compile? . #t)))))))
+                   (#:no-compile? . #t))))
+     (#:build-outputs . ()))))
diff --git a/src/cuirass/base.scm b/src/cuirass/base.scm
index 2b18dc6..b745058 100644
--- a/src/cuirass/base.scm
+++ b/src/cuirass/base.scm
@@ -1,7 +1,7 @@
 ;;; base.scm -- Cuirass base module
 ;;; Copyright © 2016, 2017, 2018, 2019 Ludovic Courtès <address@hidden>
 ;;; Copyright © 2016, 2017 Mathieu Lirzin <address@hidden>
-;;; Copyright © 2017 Mathieu Othacehe <address@hidden>
+;;; Copyright © 2017, 2020 Mathieu Othacehe <address@hidden>
 ;;; Copyright © 2017 Ricardo Wurmus <address@hidden>
 ;;; Copyright © 2018 Clément Lassieur <address@hidden>
 ;;;
@@ -41,6 +41,7 @@
   #:use-module (ice-9 popen)
   #:use-module (ice-9 rdelim)
   #:use-module (ice-9 receive)
+  #:use-module (ice-9 regex)
   #:use-module (ice-9 atomic)
   #:use-module (ice-9 ftw)
   #:use-module (ice-9 threads)
@@ -638,7 +639,42 @@ started)."
       (spawn-builds store valid)
       (log-message "done with restarted builds"))))
 
-(define (build-packages store jobs eval-id)
+(define (create-build-outputs builds product-specs)
+  "Given BUILDS a list of built derivations, save the build products described
+by PRODUCT-SPECS."
+  (define (find-build job-regex)
+    (find (lambda (build)
+            (let ((job-name (assq-ref build #:job-name)))
+              (string-match job-regex job-name)))
+          builds))
+
+  (define* (find-product build spec)
+    (let* ((outputs (assq-ref build #:outputs))
+           (output (assq-ref spec #:output))
+           (path (assq-ref spec #:path))
+           (root (and=> (assoc-ref outputs output)
+                        (cut assq-ref <> #:path))))
+      (and root
+           (if (string=? path "")
+               root
+               (string-append root "/" path)))))
+
+  (define (file-size file)
+    (stat:size (stat file)))
+
+  (map (lambda (spec)
+         (let* ((build (find-build (assq-ref spec #:job)))
+                (product (find-product build spec)))
+           (when (and product (file-exists? product))
+             (db-add-build-product `((#:build . ,(assq-ref build #:id))
+                                     (#:type . (assq-ref spec #:type))
+                                     (#:file-size . ,(file-size product))
+                                     ;; TODO: Implement it.
+                                     (#:sha256-hash . "")
+                                     (#:path . ,product))))))
+       product-specs))
+
+(define (build-packages store spec jobs eval-id)
   "Build JOBS and return a list of Build results."
   (define (register job)
     (let* ((name     (assq-ref job #:job-name))
@@ -692,6 +728,8 @@ started)."
                               outputs))
                            outputs))
          (fail (- (length derivations) success)))
+
+    (create-build-outputs results (assq-ref spec #:build-outputs))
     (log-message "outputs:\n~a" (string-join outs "\n"))
     (log-message "success: ~a, fail: ~a" success fail)
     results))
@@ -777,7 +815,7 @@ started)."
                  (let ((jobs (evaluate store spec eval-id checkouts)))
                    (log-message "building ~a jobs for '~a'"
                                 (length jobs) name)
-                   (build-packages store jobs eval-id))))))
+                   (build-packages store spec jobs eval-id))))))
 
           ;; 'spawn-fiber' returns zero values but we need one.
           *unspecified*))))
diff --git a/src/cuirass/database.scm b/src/cuirass/database.scm
index f80585e..0ed0720 100644
--- a/src/cuirass/database.scm
+++ b/src/cuirass/database.scm
@@ -1,6 +1,6 @@
 ;;; database.scm -- store evaluation and build results
 ;;; Copyright © 2016, 2017 Mathieu Lirzin <address@hidden>
-;;; Copyright © 2017 Mathieu Othacehe <address@hidden>
+;;; Copyright © 2017, 2020 Mathieu Othacehe <address@hidden>
 ;;; Copyright © 2018, 2020 Ludovic Courtès <address@hidden>
 ;;; Copyright © 2018 Clément Lassieur <address@hidden>
 ;;; Copyright © 2018 Tatiana Sholokhova <address@hidden>
@@ -47,6 +47,7 @@
             db-get-pending-derivations
             build-status
             db-add-build
+            db-add-build-product
             db-update-build-status!
             db-get-output
             db-get-inputs
@@ -65,6 +66,8 @@
             db-get-evaluations-id-min
             db-get-evaluations-id-max
             db-get-evaluation-specification
+            db-get-build-product-path
+            db-get-build-products
             db-get-evaluation-summary
             db-get-checkouts
             read-sql-file
@@ -334,7 +337,8 @@ table."
   (with-db-worker-thread db
     (sqlite-exec db "\
 INSERT OR IGNORE INTO Specifications (name, load_path_inputs, \
-package_path_inputs, proc_input, proc_file, proc, proc_args) \
+package_path_inputs, proc_input, proc_file, proc, proc_args, \
+build_outputs) \
   VALUES ("
                  (assq-ref spec #:name) ", "
                  (assq-ref spec #:load-path-inputs) ", "
@@ -342,7 +346,8 @@ package_path_inputs, proc_input, proc_file, proc, 
proc_args) \
                  (assq-ref spec #:proc-input) ", "
                  (assq-ref spec #:proc-file) ", "
                  (symbol->string (assq-ref spec #:proc)) ", "
-                 (assq-ref spec #:proc-args) ");")
+                 (assq-ref spec #:proc-args) ", "
+                 (assq-ref spec #:build-outputs) ");")
     (let ((spec-id (last-insert-rowid db)))
       (for-each (lambda (input)
                   (db-add-input (assq-ref spec #:name) input))
@@ -386,7 +391,7 @@ DELETE FROM Specifications WHERE name=" name ";")
       (match rows
         (() specs)
         ((#(name load-path-inputs package-path-inputs proc-input proc-file proc
-                 proc-args)
+                 proc-args build-outputs)
            . rest)
          (loop rest
                (cons `((#:name . ,name)
@@ -398,7 +403,9 @@ DELETE FROM Specifications WHERE name=" name ";")
                        (#:proc-file . ,proc-file)
                        (#:proc . ,(with-input-from-string proc read))
                        (#:proc-args . ,(with-input-from-string proc-args read))
-                       (#:inputs . ,(db-get-inputs name)))
+                       (#:inputs . ,(db-get-inputs name))
+                       (#:build-outputs .
+                        ,(with-input-from-string build-outputs read)))
                      specs)))))))
 
 (define (db-add-evaluation spec-name checkouts)
@@ -538,6 +545,19 @@ VALUES ("
          =>
          (sqlite-exec db "ROLLBACK;") #f))))
 
+(define (db-add-build-product product)
+  "Insert PRODUCT into BuildProducts table."
+  (with-db-worker-thread db
+    (sqlite-exec db "\
+INSERT INTO BuildProducts (build, type, file_size, sha256_hash,
+path) VALUES ("
+                 (assq-ref product #:build) ", "
+                 (assq-ref product #:type) ", "
+                 (assq-ref product #:file-size) ", "
+                 (assq-ref product #:sha256-hash) ", "
+                 (assq-ref product #:path) ");")
+    (last-insert-rowid db)))
+
 (define* (db-update-build-status! drv status #:key log-file)
   "Update the database so that DRV's status is STATUS.  This also updates the
 'starttime' or 'stoptime' fields.  If LOG-FILE is true, record it as the build
@@ -1066,3 +1086,30 @@ AND (" status " IS NULL OR (" status " = 'pending'
 SELECT specification FROM Evaluations
 WHERE id = " eval)))
       (and=> (expect-one-row rows) (cut vector-ref <> 0)))))
+
+(define (db-get-build-product-path id)
+  "Return the build product with the given ID."
+  (with-db-worker-thread db
+    (let ((rows (sqlite-exec db "
+SELECT path FROM BuildProducts
+WHERE rowid = " id)))
+      (and=> (expect-one-row rows) (cut vector-ref <> 0)))))
+
+(define (db-get-build-products build-id)
+  "Return the build products associated to the given BUILD-ID."
+  (with-db-worker-thread db
+    (let loop ((rows  (sqlite-exec db "
+SELECT rowid, type, file_size, sha256_hash, path from BuildProducts
+WHERE build = " build-id))
+               (products '()))
+      (match rows
+        (() (reverse products))
+        ((#(id type file-size sha256-hash path)
+           . rest)
+         (loop rest
+               (cons `((#:id . ,id)
+                       (#:type . ,type)
+                       (#:file-size . ,file-size)
+                       (#:sha256-hash . ,sha256-hash)
+                       (#:path . ,path))
+                     products)))))))
diff --git a/src/cuirass/http.scm b/src/cuirass/http.scm
index c5901f0..79fa246 100644
--- a/src/cuirass/http.scm
+++ b/src/cuirass/http.scm
@@ -1,6 +1,6 @@
 ;;;; http.scm -- HTTP API
 ;;; Copyright © 2016 Mathieu Lirzin <address@hidden>
-;;; Copyright © 2017 Mathieu Othacehe <address@hidden>
+;;; Copyright © 2017, 2020 Mathieu Othacehe <address@hidden>
 ;;; Copyright © 2018, 2019, 2020 Ludovic Courtès <address@hidden>
 ;;; Copyright © 2018 Clément Lassieur <address@hidden>
 ;;; Copyright © 2018 Tatiana Sholokhova <address@hidden>
@@ -246,17 +246,29 @@ Hydra format."
         "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";)
        (sxml->xml body port))))
 
+  (define* (respond-file file
+                         #:key name)
+    (let ((content-type (or (assoc-ref %file-mime-types
+                                       (file-extension file))
+                            '(application/octet-stream))))
+      (respond `((content-type . ,content-type)
+                 ,@(if name
+                       `((content-disposition
+                          . (form-data (filename . ,name))))
+                       '()))
+               ;; FIXME: FILE is potentially big so it'd be better to not load
+               ;; it in memory and instead 'sendfile' it.
+               #:body (call-with-input-file file get-bytevector-all))))
+
   (define (respond-static-file path)
     ;; PATH is a list of path components
     (let ((file-name (string-join path "/"))
           (file-path (string-join (cons* (%static-directory) path) "/")))
-      (if (and (member file-name %file-white-list)
+    (if (and (member file-name %file-white-list)
                (file-exists? file-path)
                (not (file-is-directory? file-path)))
-          (respond `((content-type . ,(assoc-ref %file-mime-types
-                                                 (file-extension file-path))))
-                   #:body (call-with-input-file file-path get-bytevector-all))
-          (respond-not-found file-name))))
+        (respond-file file-path)
+        (respond-not-found file-name))))
 
   (define (respond-gzipped-file file)
     ;; Return FILE with 'gzip' content-encoding.
@@ -318,7 +330,8 @@ Hydra format."
               (#:url . "https://git.savannah.gnu.org/git/guix.git";)
               (#:load-path . ".")
               (#:branch . ,name)
-              (#:no-compile? . #t)))))
+              (#:no-compile? . #t)))
+           (#:build-outputs . ())))
         (respond (build-response #:code 302
                                  #:headers `((location . 
,(string->uri-reference
                                                            
"/admin/specifications"))))
@@ -352,11 +365,12 @@ Hydra format."
            (respond-json (object->json-string hydra-build))
            (respond-build-not-found id))))
     (('GET "build" build-id "details")
-     (let ((build (db-get-build (string->number build-id))))
+     (let ((build (db-get-build (string->number build-id)))
+           (products (db-get-build-products build-id)))
        (if build
            (respond-html
             (html-page (string-append "Build " build-id)
-                       (build-details build)
+                       (build-details build products)
                        `(((#:name . ,(assq-ref build #:specification))
                           (#:link . ,(string-append "/jobset/" (assq-ref build 
#:specification)))))))
            (respond-build-not-found build-id))))
@@ -505,6 +519,10 @@ Hydra format."
              query))
            (respond-json-with-error 500 "Query parameter not provided!"))))
 
+    (('GET "download" id)
+     (let ((path (db-get-build-product-path id)))
+       (respond-file path #:name (basename path))))
+
     (('GET "static" path ...)
      (respond-static-file path))
     (_
diff --git a/src/cuirass/templates.scm b/src/cuirass/templates.scm
index 4104c7b..600d9d8 100644
--- a/src/cuirass/templates.scm
+++ b/src/cuirass/templates.scm
@@ -2,6 +2,7 @@
 ;;; Copyright © 2018 Tatiana Sholokhova <address@hidden>
 ;;; Copyright © 2018, 2019, 2020 Ludovic Courtès <address@hidden>
 ;;; Copyright © 2019, 2020 Ricardo Wurmus <address@hidden>
+;;; Copyright © 2020 Mathieu Othacehe <address@hidden>
 ;;;
 ;;; This file is part of Cuirass.
 ;;;
@@ -27,6 +28,7 @@
   #:use-module (srfi srfi-26)
   #:use-module (web uri)
   #:use-module (guix derivations)
+  #:use-module (guix progress)
   #:use-module (guix store)
   #:use-module ((guix utils) #:select (string-replace-substring))
   #:use-module ((cuirass database) #:select (build-status))
@@ -212,7 +214,7 @@ system whose names start with " (code "guile-") ":" (br)
                             "Add")))))
            '()))))
 
-(define (build-details build)
+(define (build-details build products)
   "Return HTML showing details for the BUILD."
   (define status (assq-ref build #:status))
   (define blocking-outputs
@@ -282,7 +284,38 @@ system whose names start with " (code "guile-") ":" (br)
       (tr (th "Outputs")
           (td ,(map (match-lambda ((out (#:path . path))
                                    `(pre ,path)))
-                    (assq-ref build #:outputs))))))))
+                    (assq-ref build #:outputs))))
+      ,@(if (null? products)
+            '()
+            (let ((product-items
+                   (map
+                    (lambda (product)
+                      (let* ((id (assq-ref product #:id))
+                             (size (assq-ref product #:file-size))
+                             (type (assq-ref product #:type))
+                             (path (assq-ref product #:path))
+                             (href (format #f "/download/~a" id)))
+                        `(a (@ (href ,href))
+                            (li (@ (class "list-group-item"))
+                                (div
+                                 (@ (class "container"))
+                                 (div
+                                  (@ (class "row"))
+                                  (div
+                                   (@ (class "col-md-auto"))
+                                   (span
+                                    (@ (class "oi oi-data-transfer-download")
+                                       (title "Download")
+                                       (aria-hidden "true"))))
+                                  (div (@ (class "col-md-auto"))
+                                       ,path)
+                                  (div (@ (class "col-md-auto"))
+                                   "(" ,(byte-count->string size) ")")))))))
+                    products)))
+              `((tr (th "Build outputs")
+                    (td
+                     (ul (@ (class "list-group d-flex flex-row"))
+                         ,product-items))))))))))
 
 (define (pagination first-link prev-link next-link last-link)
   "Return html page navigation buttons with LINKS."
diff --git a/src/schema.sql b/src/schema.sql
index 1104551..3838f75 100644
--- a/src/schema.sql
+++ b/src/schema.sql
@@ -7,7 +7,8 @@ CREATE TABLE Specifications (
   proc_input    TEXT NOT NULL, -- name of the input containing the proc that 
does the evaluation
   proc_file     TEXT NOT NULL, -- file containing the procedure that does the 
evaluation, relative to proc_input
   proc          TEXT NOT NULL, -- defined in proc_file
-  proc_args     TEXT NOT NULL  -- passed to proc
+  proc_args     TEXT NOT NULL,  -- passed to proc
+  build_outputs TEXT NOT NULL --specify what build outputs should be made 
available for download
 );
 
 CREATE TABLE Inputs (
@@ -65,6 +66,16 @@ CREATE TABLE Builds (
   FOREIGN KEY (evaluation) REFERENCES Evaluations (id)
 );
 
+CREATE TABLE BuildProducts (
+  build         INTEGER NOT NULL,
+  type          TEXT NOT NULL,
+  file_size     BIGINT NOT NULL,
+  sha256_hash   TEXT NOT NULL,
+  path          TEXT NOT NULL,
+  PRIMARY KEY (build, path)
+  FOREIGN KEY (build) REFERENCES Builds (id) ON DELETE CASCADE
+);
+
 CREATE TABLE Events (
   id            INTEGER PRIMARY KEY,
   type          TEXT NOT NULL,
diff --git a/src/sql/upgrade-7.sql b/src/sql/upgrade-7.sql
new file mode 100644
index 0000000..02e9c41
--- /dev/null
+++ b/src/sql/upgrade-7.sql
@@ -0,0 +1,15 @@
+BEGIN TRANSACTION;
+
+CREATE TABLE BuildProducts (
+  build         INTEGER NOT NULL,
+  type          TEXT NOT NULL,
+  file_size     BIGINT NOT NULL,
+  sha256_hash   TEXT NOT NULL,
+  path          TEXT NOT NULL,
+  PRIMARY KEY (build, path)
+  FOREIGN KEY (build) REFERENCES Builds (id) ON DELETE CASCADE
+);
+
+ALTER TABLE Specifications ADD build_outputs TEXT NOT NULL DEFAULT "()";
+
+COMMIT;
diff --git a/tests/database.scm b/tests/database.scm
index 6098465..98b5012 100644
--- a/tests/database.scm
+++ b/tests/database.scm
@@ -3,6 +3,7 @@
 ;;; Copyright © 2016 Mathieu Lirzin <address@hidden>
 ;;; Copyright © 2018 Ludovic Courtès <address@hidden>
 ;;; Copyright © 2018 Clément Lassieur <address@hidden>
+;;; Copyright © 2020 Mathieu Othacehe <address@hidden>
 ;;;
 ;;; This file is part of Cuirass.
 ;;;
@@ -45,7 +46,8 @@
                   (#:branch . "master")
                   (#:tag . #f)
                   (#:commit . #f)
-                  (#:no-compile? . #f))))))
+                  (#:no-compile? . #f))))
+    (#:build-outputs . ())))
 
 (define (make-dummy-checkouts fakesha1 fakesha2)
   `(((#:commit . ,fakesha1)
diff --git a/tests/http.scm b/tests/http.scm
index d20a3c3..d69c25c 100644
--- a/tests/http.scm
+++ b/tests/http.scm
@@ -1,7 +1,7 @@
 ;;; http.scm -- tests for (cuirass http) module
 ;;; Copyright © 2016 Mathieu Lirzin <address@hidden>
 ;;; Copyright © 2017, 2018, 2019, 2020 Ludovic Courtès <address@hidden>
-;;; Copyright © 2017 Mathieu Othacehe <address@hidden>
+;;; Copyright © 2017, 2020 Mathieu Othacehe <address@hidden>
 ;;; Copyright © 2018 Clément Lassieur <address@hidden>
 ;;;
 ;;; This file is part of Cuirass.
@@ -170,7 +170,8 @@
                             (#:branch . "master")
                             (#:tag . #f)
                             (#:commit . #f)
-                            (#:no-compile? . #f))))))
+                            (#:no-compile? . #f))))
+              (#:build-outputs . ())))
            (checkouts1
             '(((#:commit . "fakesha1")
                (#:input . "savannah")
-- 
2.26.0

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