83 lines
2.2 KiB
Bash
Executable File
83 lines
2.2 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -e
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# Helper to check a file matches its known hash
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# Call it with:
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# $1: the path of the file containing all the the expected hashes
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# $2: the full path to the temporary file that was downloaded, and
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# that is to be checked
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# $3: the final basename of the file, to which it will be ultimately
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# saved as, to be able to match it to the corresponding hashes
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# in the .hash file
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h_file="${1}"
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file="${2}"
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base="${3}"
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# Does the hash-file exist?
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if [ ! -f "${h_file}" ]; then
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exit 0
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fi
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# Check one hash for a file
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# $1: known hash
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# $2: file (full path)
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check_one_hash() {
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_h="${1}"
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_known="${2}"
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_file="${3}"
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# Note: md5 is supported, but undocumented on purpose.
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# Note: sha3 is not supported, since there is currently no implementation
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# (the NIST has yet to publish the parameters).
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case "${_h}" in
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md5|sha1) ;;
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sha224|sha256|sha384|sha512) ;;
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*) # Unknown hash, exit with error
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printf "ERROR: unknown hash '%s' for '%s'\n" \
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"${_h}" "${base}" >&2
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exit 1
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;;
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esac
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# Do the hashes match?
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_hash=$( ${_h}sum "${_file}" |cut -d ' ' -f 1 )
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if [ "${_hash}" = "${_known}" ]; then
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printf "%s: OK (%s: %s)\n" "${base}" "${_h}" "${_hash}"
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return 0
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fi
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printf "ERROR: %s has wrong %s hash:\n" "${base}" "${_h}" >&2
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printf "ERROR: expected: %s\n" "${_known}" >&2
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printf "ERROR: got : %s\n" "${_hash}" >&2
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printf "ERROR: Incomplete download, or man-in-the-middle (MITM) attack\n" >&2
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exit 1
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}
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# Do we know one or more hashes for that file?
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nb_checks=0
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while read t h f; do
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case "${t}" in
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''|'#'*)
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# Skip comments and empty lines
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continue
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;;
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*)
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if [ "${f}" = "${base}" ]; then
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check_one_hash "${t}" "${h}" "${file}"
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: $((nb_checks++))
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fi
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;;
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esac
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done <"${h_file}"
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if [ ${nb_checks} -eq 0 ]; then
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if [ -n "${BR2_ENFORCE_CHECK_HASH}" ]; then
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printf "ERROR: No hash found for %s\n" "${base}" >&2
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exit 1
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else
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printf "WARNING: No hash found for %s\n" "${base}" >&2
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fi
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fi
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