prefetch-github.sh

#!/usr/bin/env nix-shell
#!nix-shell -i bash -p gitMinimal nix-prefetch-git jq
set -e
project="$1"
branch="${2:-master}"

owner=$(echo "$project" | cut -d/ -f1)
repo=$(echo "$project" | cut -d/ -f2)
rev=$(git ls-remote "git://github.com/$project.git" "$branch" | head -n1 | awk '{print $1}')
rev=${rev:-$2}
hash=$(nix-prefetch-url "https://github.com/$project/archive/$rev.tar.gz")

function show() {
cat << EOF
{
    "owner": "$owner",
    "repo": "$repo",
    "rev": "$rev",
    "sha256": "$hash"
}
EOF
}

show

hash=$(nix-prefetch-git "github.com/$project.git" --rev "$rev" --quiet | jq -r .sha256)

show