upload-to-github.sh

#!/bin/sh

die () {
	echo "$*" >&2
	exit 1
}

test $# -ge 2 ||
die "Usage: $0 [--repo=<repo>] <tag-name> <path>..."

repo=git-for-windows/build-extra
gentle=
while case "$1" in
--repo=*)
	repo=${1#--repo=}
	test "a${repo}" != "a${repo#*/}" ||
	repo=git-for-windows/$repo
	;;
--gentle)
	gentle=t
	;;
-*)
	die "Unknown option: $1"
	;;
*)
	break
	;;
esac; do shift; done

tagname="$1"
shift

url=https://api.github.com/repos/$repo/releases
releases="$(curl --netrc -s $url)"
id="$(echo "$releases" |
	grep -B1 "\"tag_name\": \"$tagname\"" |
	sed -n 's/.*"id": *\([0-9]*\).*/\1/p')"
test -n "$id" || {
	out="$(curl --netrc -s -XPOST -d \
		'{"tag_name":"'"$tagname"'","draft":true,"prerelease":true}' \
		$url)" ||
	die "Error creating release: $out"
	id="$(echo "$out" |
		sed -n 's/^  "id": *\([0-9]*\).*/\1/p')"
	test -n "$id" ||
	die "Could not create release for tag $tagname"
}

uploaded=
test -z "$gentle" ||
uploaded=" $(echo "$releases" |
	sed -n '/^    "id": '$id',$/,/^  }/s/^        "name": "\(.*\)".*/\1/p' |
	tr '\n' ' ') "

url=https://uploads.${url#https://api.}

release_url=
for path
do
	case "$path" in
	*.exe)
		contenttype=application/executable
		;;
	*.7z)
		contenttype=application/zip
		;;
	*)
		contenttype="$(file --brief --mime-type "$path")" ||
		die "Unknown file type: $path"
		;;
	esac
	basename="$(basename "$path")"
	case "$uploaded" in *" $basename "*) continue;; esac
	json="$(curl -i --netrc -XPOST -H "Content-Type: $contenttype" \
		--data-binary @"$path" "$url/$id/assets?name=$basename")" &&
	case "$json" in
	HTTP/1.?\ [12]*|HTTP/2\ [12]*) ;; # okay
	*) false;; # error!
	esac ||
	die "Could not upload $path (response: $json)"

	url2="$(echo "${json##*\"browser_download_url\":\"}" | sed -n \
		'1s|\([^"]*/\)download\(/[^"]*/\)[^/]*".*|\1edit\2|'p)"
	if test -z "$release_url"
	then
		release_url=$url2
	else
		test "a$url2" = "a$release_url" ||
		echo "Warning: inconsistent URL: $url2 vs $release_url" >&2
		printf '\nresponse was:\n%s\n' "$json" >&2
	fi
done

test -z "$release_url" ||
printf "\nNow direct your browser to:\n\n%s\n" "$release_url"