From aac6c242e8da2d630da4b712e20622db604da75a Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Wed, 14 Aug 2019 13:07:21 +0200
Subject: nix-prefetch-github: init

---
 krebs/5pkgs/simple/nix-prefetch-github.nix | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 krebs/5pkgs/simple/nix-prefetch-github.nix

diff --git a/krebs/5pkgs/simple/nix-prefetch-github.nix b/krebs/5pkgs/simple/nix-prefetch-github.nix
new file mode 100644
index 000000000..14096c33f
--- /dev/null
+++ b/krebs/5pkgs/simple/nix-prefetch-github.nix
@@ -0,0 +1,25 @@
+{ curl, jq, nix, writeDashBin }:
+
+writeDashBin "nix-prefetch-github" ''
+  # usage: nix-prefetch-github OWNER REPO [REF]
+  set -efu
+
+  owner=$1
+  repo=$2
+  ref=''${3-master}
+
+  info_url=https://api.github.com/repos/$owner/$repo/commits/$ref
+  info=$(${curl}/bin/curl -fsS "$info_url")
+  rev=$(printf %s "$info" | ${jq}/bin/jq -r .sha)
+
+  name=$owner-$repo-$ref
+  url=https://github.com/$owner/$repo/tarball/$rev
+  sha256=$(${nix}/bin/nix-prefetch-url --name "$name" --unpack "$url")
+
+  export owner repo rev sha256
+  ${jq}/bin/jq -n '
+    env | {
+      owner, repo, rev, sha256
+    }
+  '
+''
-- 
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