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#!/bin/bash
# By default we enter from the latest block
# We can alter this by changing this value
entrance="$(cat $ZLATEST)"
# Start of tests
#entrance="QmW5WVXCJfhb4peHG6cbEdamC24vZzMX2Vz386vpENh38U"
#entrance="QmNjQq7GkuXGF8kFT1z2Mv3i4JhY7sBXVUmHDiR1zkQjoE"
#entrance="QmbFMke1KXqnYyBBWxB74N4c5SBnJMVAiMNRcGu6x1AwQH"
# End of tests
# We assign the IPFS CIDv0 of an empty file as this is used
# as our GENESIS block, hence the "seed" that the tree grows
# from.
seed="$(cat $ZGENESIS)"
# We assume that we found the entrance inside a block, hence
# ZBLOCK is labeled as previous
zblock="$entrance"
# The loop
# We break the loop from inside the loop
while true
do
# Check if $zblock exists as variable
if [ ! -v $zblock ]
then
# Check if it is not our seed cause if it is we skip this part
if [ "$zblock" != "$seed" ]
then
# Announce to stdout which ZBLOCK is being read at the moment
echo "Examining $zblock"
# We create files named after each ZBLOCK IPFS CID for later
# reference. Files are empty.
touch $ZBLOCKDIR/$zblock
# We concatenate the zblock's contents, pipe them through filter
# json2bash and output them to tmp-file
ipfs cat $zblock | json2bash > tmp-zblock
# Supposingly you are on a safe environment and you only have
# access to your chain, I would consider mild secure to source
# the files into your bash.
# File an issue/pull request if you think it can be done better!!
source tmp-zblock
# Same as above applies to BLOCK and DATA subparts of each ZBLOCK
# BLOCKS
ipfs cat $block | json2bash > tmp-block
source tmp-block
touch $BLOCKDIR/$block
# DATA (but we don't source it's stuff)
# Only print to stdout
ipfs cat $data
touch $DATADIR/$data
# Now, since we sourced the BLOCK to our terminal, we can search
# for $previous variable. In case we don't find one, we exit with
# code 3
if [ -v $previous ]
then
echo "Block $block has no previous zblock"
exit 3
# Otherwise, we inform of the sequence
else
echo "$zblock after $previous"
zblock=$previous
fi
# Now check if it is equal to the seed
# which apparently means we reached the seed.
elif [ "$zblock" == "$seed" ]
then
echo "$zblock is GENESIS block"
exit 0
fi
# And finally, if nothing is there exit with error
else
echo "Check not passed... No previous IPFS CID"
exit 1
fi
done
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