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{ 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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