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#!/bin/sh
# Demo git-annex external backend program.
#
# Install in PATH as git-annex-backend-XFOO
#
# Copyright 2020 Joey Hess; licenced under the GNU GPL version 3 or higher.
set -e
hashfile () {
local contentfile="$1"
# could send PROGRESS while doing this, but it's
# hard to implement that in shell
md5sum "$contentfile" | cut -d ' ' -f 1 || echo ''
}
while read line; do
set -- $line
case "$1" in
GETVERSION)
echo VERSION 1
;;
CANVERIFY)
echo CANVERIFY-YES
;;
ISSTABLE)
echo ISSTABLE-YES
;;
ISCRYPTOGRAPHICALLYSECURE)
# md5 is not cryptographically secure
echo ISCRYPTOGRAPHICALLYSECURE-NO
;;
GENKEY)
contentfile="$2"
hash=$(hashfile "$contentfile")
sz=$(wc -c "$contentfile" | cut -d ' ' -f 1)
if [ -n "$hash" ]; then
echo "GENKEY-SUCCESS" "XFOO-s$sz--$hash"
else
echo "GENKEY-FAILURE" "md5sum failed"
fi
;;
VERIFYKEYCONTENT)
key="$2"
contentfile="$3"
hash=$(hashfile "$contentfile")
khash=$(echo "$key" | sed 's/.*--//')
if [ "$hash" = "$khash" ]; then
echo "VERIFYKEYCONTENT-SUCCESS"
else
echo "VERIFYKEYCONTENT-FAILURE"
fi
;;
*)
echo ERROR protocol error
;;
esac
done
|
