1 files changed, 85 insertions, 0 deletions
diff --git a/bin/enter b/bin/enter
new file mode 100755
index 0000000..6865797
--- /dev/null
+++ b/bin/enter
@@ -0,0 +1,85 @@
+#!/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