how to check sha256

Author: ingun37

README.md

@@ -34,4 +34,39 @@ flowchart LR
 
     n1@{ shape: rect}
     n9@{ shape: rect}
-```
+```
+
+# CI/CD
+
+Check the sha1 of gitlib like this
+
+```sh
+nix-shell -p nix-prefetch-git 
+nix-prefetch-git https://github.com/jwiegley/gitlib.git bf256617179d853bdbc12e9283b3f570ebb9d9d7 --fetch-submodules
+```
+
+Output is like
+
+```
+git revision is bf256617179d853bdbc12e9283b3f570ebb9d9d7
+path is /nix/store/63bx4k5nwjqwk7gv0a0k8adq796bjbpr-gitlib-bf25661
+git human-readable version is -- none --
+Commit date is 2025-09-04 11:17:27 -0700
+hash is 13k3aymqwzpcijnjjka820nv6rkgakzbvh13glw98p1c4yhqwcbf
+{
+  "url": "https://github.com/jwiegley/gitlib.git",
+  "rev": "bf256617179d853bdbc12e9283b3f570ebb9d9d7",
+  "date": "2025-09-04T11:17:27-07:00",
+  "path": "/nix/store/63bx4k5nwjqwk7gv0a0k8adq796bjbpr-gitlib-bf25661",
+  "sha256": "13k3aymqwzpcijnjjka820nv6rkgakzbvh13glw98p1c4yhqwcbf",
+  "hash": "sha256-bjGOoScsXJQ4fSPAvf5Ub2azLRBITSmtjOx+jqtXY44=",
+  "fetchLFS": false,
+  "fetchSubmodules": true,
+  "deepClone": false,
+  "fetchTags": false,
+  "leaveDotGit": false,
+  "rootDir": ""
+}
+```
+
+Use the "sha256" for the `--sha256` field in the `cabal.project`.