Add push-release.sh helper

Prepares, signs and pushes a release to github.

helper/push-release.sh

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+REPO=fort-nix/nix-bitcoin
+BRANCH=master
+OAUTH_TOKEN=$(pass show nix-bitcoin/github/oauth-token)
+
+if [[ ! $OAUTH_TOKEN ]]; then
+    echo "Please set OAUTH_TOKEN variable"
+fi
+
+if [[ $# < 1 ]]; then
+    echo "$0 <tag_name>"
+    exit
+fi
+TAG_NAME=$1
+
+RESPONSE=$(curl https://api.github.com/repos/$REPO/releases/latest 2> /dev/null)
+echo "Latest release" $(echo $RESPONSE | jq -r '.tag_name' | tail -c +2)
+while true; do
+    read -p "Create release $1? [yn] " yn
+    case $yn in
+        [Yy]* ) break;;
+        [Nn]* ) exit;;
+        * ) echo "Please answer y or n.";;
+    esac
+done
+
+TMPDIR=$(mktemp -d)
+trap "rm -rf $TMPDIR" EXIT
+ARCHIVE_NAME=nix-bitcoin-$TAG_NAME.tar.gz
+ARCHIVE=$TMPDIR/$ARCHIVE_NAME
+
+# Need to be in the repositories root directory for archiving
+(cd $(git rev-parse --show-toplevel); git archive --format=tar.gz -o $ARCHIVE $BRANCH)
+
+SHA256SUMS=$TMPDIR/SHA256SUMS.txt
+# Want to use relative path with sha256sums because it'll output the first
+# argument
+(cd $TMPDIR; sha256sum $ARCHIVE_NAME > $SHA256SUMS)
+gpg -o $SHA256SUMS.asc -a --detach-sig $SHA256SUMS
+
+POST_DATA="{ \"tag_name\": \"v$TAG_NAME\", \"name\": \"nix-bitcoin-$TAG_NAME\", \"body\": \"nix-bitcoin-$TAG_NAME\", \"target_comitish\": \"$BRANCH\" }"
+RESPONSE=$(curl -H "Authorization: token $OAUTH_TOKEN" -d "$POST_DATA" https://api.github.com/repos/$REPO/releases 2> /dev/null)
+ID=$(echo $RESPONSE | jq -r '.id')
+if [[ $ID == null ]]; then
+    echo "Failed to create release with $POST_DATA"
+    exit 1
+fi
+
+post_asset() {
+    GH_ASSET="https://uploads.github.com/repos/$REPO/releases/$ID/assets?name="
+    curl -H "Authorization: token $OAUTH_TOKEN" --data-binary "@$1" -H "Content-Type: application/octet-stream" \
+         $GH_ASSET/$(basename $1) &> /dev/null
+}
+post_asset $ARCHIVE
+post_asset $SHA256SUMS
+post_asset $SHA256SUMS.asc
+echo "Successfully created" $(echo $POST_DATA | jq -r .tag_name)