Download .snap package file

download-snap.sh

#!/bin/bash
ARCH=amd64
RELEASE=stable
#export PATH="$PATH:/snap/bin/"
eval assert_fetcher_path="~/assert-fetcher/bin/assert-fetcher"

PACKAGE=$1

echo "Checking for jq..."
which jq
nojq=$?

if [ $nojq -gt 0 ]; then
    echo "This snippet requires jq to function. Please install jq and try again"
    exit 1
fi

if [ -z $PACKAGE ]; then
    echo "Enter name of snap package to manually download:"
    read PACKAGE
fi

meta_url="http://api.snapcraft.io/v2/snaps/info/${PACKAGE}"
echo "Fetching metadata from ${meta_url}..."

curl -H 'Snap-Device-Series: 16' -o ${PACKAGE}.json ${meta_url}
grep -v "error-list" ${PACKAGE}.json > /dev/null
curl_stat=$?

if [ $curl_stat -gt 0 ]; then
    echo "Problem fetching ${PACKAGE} metadata."
    echo "See file ${PACKAGE}.json for details."
    exit
fi

url=$( cat ${PACKAGE}.json | jq '."channel-map"' | jq '.[]' | jq '[."channel"."architecture", ."channel"."name", ."download"."url"]' | grep -A2 ${ARCH} | grep -A1 ${RELEASE} | grep http | tr -d ' ' | tr -d '"' )

echo "Downloading '$url'..."
curl -L -o "${PACKAGE}.snap" -C - "$url"
curl2_stat=$?

ls -lh ${PACKAGE}.snap

if [ $curl2_stat -gt 0 ]; then
    echo "Download failed. Re-run this snippet to attempt to resume download"
    exit 1
fi

echo "Downloaded ${PACKAGE}.snap successfully. Attempting to fetch ${PACKAGE}.assert now."

echo "Checking for assert-fetcher..."
which ${assert_fetcher_path}
noassert_fetcher=$?
if [ $noassert_fetcher -gt 0 ]; then
    echo "assert-fetcher executable not found at ${assert_fetcher_path}. Checking system path."

    SNAP_PATH=$( which assert-fetcher )
    noassert_fetcher2=$?

    if [ $noassert_fetcher2 -gt 0 ]; then
        echo "assert-fetcher not found in system path. You will need to run asset-fetcher manually or install your snap with --dangerous (not recomended)."
        exit 1
    fi
    assert_fetcher_path="$SNAP_PATH"
fi

${assert_fetcher_path} ${PACKAGE}.snap
assert_fetcher_stat=$?
if [ $assert_fetcher_stat -gt 0 ]; then
    echo "Failed to fetch ${PACKAGE}.assert."
    exit 1
fi

ls -lh ${PACKAGE}.*
echo "Snap and Assert file for ${PACKAGE} downloaded successfully."
exit 0