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33 lines
667 B
Bash
Executable File
33 lines
667 B
Bash
Executable File
#!/bin/sh
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if [ "$#" -ne 3 ]; then
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echo "Usage:"
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echo " sha256-file-to SHA256 http://FETCH/FROM DST"
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echo
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echo "SHA256 is the sha256sum of the file fetched; the file is"
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echo "placed in DST."
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exit 1
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fi
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set -e
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set -x
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SHA256="$1"
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URL="$2"
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DST="$3"
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# Work in a tmpdir which we clean up at the end
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tmpdir="$(mktemp -d)"
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trap 'rm -r "$tmpdir"' EXIT
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cd "$tmpdir"
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# Fetch to a predictable name, not whatever curl guesses from the URL
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LOCALFILE="output"
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curl -fL --retry 3 -o "$LOCALFILE" "$URL"
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# Check the hash against what was passed in
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echo "$SHA256 $LOCALFILE" >"$LOCALFILE.sha256"
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sha256sum -c "$LOCALFILE.sha256"
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mv "$LOCALFILE" "$DST"
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