mirror of
https://github.com/linuxboot/heads.git
synced 2024-12-18 20:47:55 +00:00
d6ef65c578
storage.puri.st is an alternate host name for storage.puri.sm, in case there is another issue with the .sm name registration. Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
94 lines
2.1 KiB
Bash
Executable File
94 lines
2.1 KiB
Bash
Executable File
#! /usr/bin/env bash
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set -eo pipefail
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# Mirror URLs, make sure these end in slashes.
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BACKUP_MIRRORS=(
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https://storage.puri.sm/heads-packages/
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https://storage.puri.st/heads-packages/
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)
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usage()
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{
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cat <<USAGE_END
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usage:
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$0 <url> <file> <digest>
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$0 --help
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Downloads <url> to <file>, falling back to package mirrors if the
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primary source is not available or does match the expected digest. The
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digest can be a SHA-256 (preferred) or SHA-1 digest.
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Uses wget, export WGET to override the path to wget.
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USAGE_END
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}
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if [ "$#" -lt 2 ]; then
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usage
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exit 1
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fi
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URL="$1"
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FILE="$2"
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DIGEST="$3"
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TMP_FILE="$2.tmp"
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WGET="${WGET:-wget}"
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case "$(echo -n "$DIGEST" | wc -c)" in
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64)
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SHASUM=sha256sum
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;;
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40)
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# coreboot crossgcc archives have SHA-1 digests from coreboot
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SHASUM=sha1sum
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;;
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*)
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echo "Unknown digest for $FILE: $DIGEST" >&2
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exit 1
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;;
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esac
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download() {
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local download_url
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download_url="$1"
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if ! "$WGET" -O "$TMP_FILE" "$download_url"; then
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echo "Failed to download $download_url" >&2
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elif ! echo "$DIGEST $TMP_FILE" | "$SHASUM" --check -; then
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echo "File from $download_url does not match expected digest" >&2
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else
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mv "$TMP_FILE" "$FILE" # Matches, keep this file
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return 0
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fi
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rm -f "$TMP_FILE" # Wasn't downloaded or failed check
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return 1
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}
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# If the file exists already and the digest is correct, use the cached copy.
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if [ -f "$FILE" ] && (echo "$DIGEST $FILE" | "$SHASUM" --check -); then
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echo "File $FILE is already cached" >&2
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exit 0
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fi
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rm -f "$FILE" "$TMP_FILE"
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# Try the primary source
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download "$URL" && exit 0
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# Shuffle the mirrors so we try each equally
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readarray -t BACKUP_MIRRORS < <(shuf -e "${BACKUP_MIRRORS[@]}")
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# The mirrors use our archive names, which may differ from the primary source
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# (e.g. musl-cross-make archives are just <hash>.tar.gz, makes more sense to use
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# musl-cross-<hash>.tar.gz). This also means mirrors can be seeded directly
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# from the packages/<arch>/ directories.
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archive="$(basename "$FILE")"
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echo "Try mirrors for $archive" >&2
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for mirror in "${BACKUP_MIRRORS[@]}"; do
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download "$mirror$archive" && exit 0
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done
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# All mirrors failed
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exit 1
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