Download from enterprise github behind Oauth redirect.

gh-dl-release.sh

#!/usr/bin/env bash
#
# gh-dl-release! It works!
#
# This script downloads an asset from latest or specific Github release of a
# private repo. Feel free to extract more of the variables into command line
# parameters.
#
# PREREQUISITES
#
# curl,  jq
#
# If your version/tag doesn't match, the script will exit with error.
# if the file you specify isn't there it will break as well
# example cmd line (with fake token):
# ./gh-dl-release -t 7e10abdcd7684c27b3c470e35a02a7100llcb0126a7 -r Platform-Common/dummie -v 2.0.1.0 -f dumpy-2.0.1.0.tgz -o $PWD/
#


set -e
usage() { echo "Usage: $0 -t <github token> -r <repo> -v <version> -f <file> -o <output path> -q" 1>&2; exit 1; }

while getopts "qt:v:r:f:o:" o; do
    case "${o}" in
        t)
            TOKEN=${OPTARG}
            ;;
        v)
            VERSION=${OPTARG}
            ;;
        r)
            REPO=${OPTARG}
            ;;
        f)
            FILE=${OPTARG}
            ;;
        o)
            OUTPUT=${OPTARG}
            ;;
        q)
            QUIET=1
            ;;
        *)
            usage
            ;;
    esac
done
shift $((OPTIND-1))

if [ -z "$OUTPUT" ]; then
    OUTPUT=$FILE
fi

if [ -z "$TOKEN" ] || [ -z "$VERSION" ] || [ -z "$REPO" ] || [ -z "$FILE" ] || [ -z "$OUTPUT" ]; then
    usage
fi

GITHUB="https://sqbu-github.cisco.com";

alias errcho='>&2 echo'

gh_curl_list() {
  curl -s -H "Authorization: token $TOKEN" "$GITHUB/api/v3/repos/$REPO/releases"
}


version_exists() {
    jq ". | map(select(.tag_name == \"$VERSION\")) | length"
}

maybe_echo() {
    if [ -z "$QUIET" ]; then
        echo "$@"
    fi
}

echo_error() {
    >&2 maybe_echo "ERROR: $@"
}

echo_info() {
    maybe_echo "INFO: $@"
}

echo_success() {
    maybe_echo SUCCESS: $@
}

if [ "$VERSION" = "latest" ]; then
    # Github should return the latest release first.
    parser=".[0].assets | map(select(.name == \"$FILE\"))[0].id"
else
    parser=". | map(select(.tag_name == \"$VERSION\"))[0].assets | map(select(.name == \"$FILE\"))[0].id"
fi

RESPONSE=$(gh_curl_list)

if [ "$(echo $RESPONSE | version_exists)" = "0" ]; then
    echo_error "version '$VERSION' not found"
    exit 1
else
    echo_info "Found version '$VERSION'"
    echo $RESPONSE > /tmp/response.json
fi

ASSET_ID=$(echo "$RESPONSE" | jq "$parser")
if [ "$ASSET_ID" = "null" ]; then
    echo_error "Could not find asset '$FILE'"
    exit 1
else
    echo_info "Found asset '$FILE' id is $ASSET_ID"

fi

echo -e "Attempting to download file asset: \n$GITHUB/api/v3/repos/$REPO/releases/assets/$ASSET_ID \nto  \n$OUTPUT/$FILE\n"


curl -# -L -H "Authorization: token $TOKEN" -H  "Accept: application/octet-stream" \
    "$GITHUB/api/v3/repos/$REPO/releases/assets/$ASSET_ID" \
    --output  "$OUTPUT/$FILE"

if [ 0 -eq $? ]; then
  echo "Downloaded file successfully"
else
  echo "Curl returned an error downloading file"
fi