Send package artifact checksums to loaders when info is available

In listers collecting artifacts for each package to load, add artifacts
checksums, when that info is available, in parameters sent to loaders
in order to check downloaded artifact integrity.

swh/lister/cran/list_all_packages.R

@@ -4,6 +4,6 @@
 # all the packages of R and their description, then convert the API
 # response to JSON string and print it
 
-db <- tools::CRAN_package_db()[, c("Package", "Version", "Packaged")]
+db <- tools::CRAN_package_db()[, c("Package", "Version", "Packaged", "MD5sum")]
 dbjson <- jsonlite::toJSON(db)
 print(dbjson)

swh/lister/cran/lister.py

@@ -68,6 +68,7 @@ class CRANLister(StatelessLister[PageType]):
                             "url": artifact_url,
                             "version": package_info["Version"],
                             "package": package_info["Package"],
+                            "checksums": {"md5": package_info["MD5sum"]},
                         }
                     ]
                 },

swh/lister/cran/tests/data/list-r-packages.json

@@ -1,40 +1,32 @@
 [
-
     {
-        "Package": "SeleMix",
-        "Version": "1.0.2",
-        "Packaged": "2020-11-28 22:16:43 UTC; Teresa"
+        "Package": "cNORM",
+        "Version": "3.0.2",
+        "Packaged": "2022-06-12 08:46:39 UTC; gbpa005",
+        "MD5sum": "d878686afc17b990e500dc88afb3a990"
     },
     {
-        "Package": "plink",
-        "Version": "1.5-1",
-        "Packaged": "2017-04-26 11:36:15 UTC; Jonathan"
+        "Package": "CNprep",
+        "Version": "2.2",
+        "Packaged": "2022-05-23 23:58:37 UTC; Astrid",
+        "MD5sum": "4b6ddc37df607c79b7fb50a96a57197f"
     },
     {
-        "Package": "jsonlite",
-        "Version": "1.7.2",
-        "Packaged": "2020-12-09 13:54:18 UTC; jeroen"
-
+        "Package": "CNPS",
+        "Version": "1.0.0",
+        "Packaged": "2021-05-21 16:55:04 UTC; Surface",
+        "MD5sum": "deac071a9387e3a296481d041e6d09ee"
     },
     {
-        "Package": "Records",
-        "Version": "1.0",
-        "Packaged": "2012-10-29 08:57:37 UTC; ripley"
+        "Package": "cns",
+        "Version": "0.1.0",
+        "Packaged": "2021-07-16 19:30:51 UTC; nfultz",
+        "MD5sum": "3ad5a474260dbacb889be461b826a73b"
     },
     {
-        "Package": "scRNAtools",
-        "Version": "1.0",
-        "Packaged": "2018-07-04 00:49:45 UTC; dell"
-    },
-    {
-        "Package": "Deriv",
-        "Version": "4.1.2",
-        "Packaged": "2020-12-10 11:12:28 UTC; sokol"
-    },
-    {
-        "Package": "BayesValidate",
-        "Version": "0.0",
-        "Packaged": "Thu Mar 30 10:48:35 2006; hornik"
+        "Package": "cnum",
+        "Version": "0.1.3",
+        "Packaged": "2021-01-11 13:24:52 UTC; Elgar",
+        "MD5sum": "3cb5ab3fdaf4277d1ebfbe147e8990e1"
     }
-
 ]

swh/lister/cran/tests/test_lister.py

@@ -109,6 +109,7 @@ def test_cran_lister_cran(datadir, swh_scheduler, mocker):
                     "url": artifact_url,
                     "version": package_info["Version"],
                     "package": package_info["Package"],
+                    "checksums": {"md5": package_info["MD5sum"]},
                 }
             ]
         }