first commit

.gitignore

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+download

download.sh

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+#!/usr/bin/env bash
+
+DATE_START="2024-05-11 04:00"
+URL="https://services.swpc.noaa.gov/images/animations/ovation/north"
+
+mkdir -p ./download
+pushd ./download
+
+start_stamp=$[$(date -d "${DATE_START}" +%s --utc)]
+now=$[$(date +%s --utc)]
+j_1=$[$(date +%s --utc) - 24 * 60 * 60]
+
+istamp=${start_stamp}
+istamp=$[${j_1} - ${j_1} % (5 * 60)]
+
+function downloadIfPossible(){
+	if [ ${2} -lt ${j_1} ]
+	then
+		echo "Download Fail: file to old."
+	else
+		echo "Download ${1}."
+		wget "${URL}/${1}" -O "${1}" > /dev/null 2>&1
+	fi
+}
+
+while [ ${istamp} -lt ${now} ]
+do
+	filename=$(date -d@${istamp} "+aurora_N_%Y-%m-%d_%H%M.jpg" --utc)
+	if [ ! -f "${filename}" ]
+	then
+		echo "Downloading: ${filename}."
+		downloadIfPossible "${filename}" ${istamp}
+	else
+		if [ $(stat -c %s "${filename}") -eq 0 ]
+		then
+			rm "${filename}"
+			echo "Downloading (empty file): ${filename}."
+			downloadIfPossible "${filename}" ${istamp}
+		else
+			if ! jpeginfo -c "${filename}" > /dev/null
+			then
+				rm "${filename}"
+				echo "Downloading (corrupted file): ${filename}."
+				downloadIfPossible "${filename}" ${istamp}
+			fi
+		fi
+	fi
+
+	istamp=$[${istamp} + 5 * 60]
+done
+
+popd
+