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support/download: return different exit codes for different failures

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Return different exit codes depending on the error that occured:

  0: no error (hash file missing, or all hashes match)
  1: unknown option
  2: hash file exists, but at least one hash in error
  3: hash file exists, but no hash for file to check
  4: hash file exists, but at least one hash type unknown

This will be used in a later patch to decide whether the downloaded file
should be kept or removed.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Samuel Martin <s.martin49@gmail.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Yann E. MORIN 2015-04-01 00:15:04 +02:00 committed by Thomas Petazzoni
parent 1ba85b7f87
commit 0012b36c14
1 changed files with 12 additions and 3 deletions
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15
support/download/check-hash
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@ -9,6 +9,15 @@ set -e
# $3: the final basename of the file, to which it will be ultimately
# saved as, to be able to match it to the corresponding hashes
# in the .hash file
#
# Exit codes:
# 0: the hash file exists and the file to check matches all its hashes,
# or the hash file does not exist
# 1: unknown command-line option
# 2: the hash file exists and the file to check does not match at least
# one of its hashes
# 3: the hash file exists and there was no hash to check the file against
# 4: the hash file exists and at least one hash type is unknown
while getopts :q OPT; do
case "${OPT}" in
@ -48,7 +57,7 @@ check_one_hash() {
*) # Unknown hash, exit with error
printf "ERROR: unknown hash '%s' for '%s'\n" \
"${_h}" "${base}" >&2
exit 1
exit 4
;;
esac
@ -64,7 +73,7 @@ check_one_hash() {
printf "ERROR: got : %s\n" "${_hash}" >&2
printf "ERROR: Incomplete download, or man-in-the-middle (MITM) attack\n" >&2
exit 1
exit 2
}
# Do we know one or more hashes for that file?
@ -87,7 +96,7 @@ done <"${h_file}"
if [ ${nb_checks} -eq 0 ]; then
if [ -n "${BR2_ENFORCE_CHECK_HASH}" ]; then
printf "ERROR: No hash found for %s\n" "${base}" >&2
exit 1
exit 3
else
printf "WARNING: No hash found for %s\n" "${base}" >&2
fi