zebra/zebra-utils

Zebra Utilities

This crate contains tools for zebra maintainers.

Programs

• zebra-checkpoints
• zebrad-hash-lookup
• zebrad-log-filter

Binaries are easier to use if they are located in your system execution path.

zebra-checkpoints

This command generates a list of zebra checkpoints, and writes them to standard output. Each checkpoint consists of a block height and hash.

To create checkpoints, you need a synchronized instance of zcashd, and the zcash-cli RPC client.

zebra-checkpoints is a standalone rust binary, you can compile it using:

cargo install --locked --git https://github.com/ZcashFoundation/zebra zebra-utils 

Then update the checkpoints using these commands:

zebra-checkpoints --last-checkpoint $(tail -1 zebra-consensus/src/checkpoint/main-checkpoints.txt | cut -d" " -f1) | tee /dev/stderr >> zebra-consensus/src/checkpoint/main-checkpoints.txt &
zebra-checkpoints --last-checkpoint $(tail -1 zebra-consensus/src/checkpoint/test-checkpoints.txt | cut -d" " -f1) -- -testnet | tee /dev/stderr >> zebra-consensus/src/checkpoint/test-checkpoints.txt &
wait

You can see all the zebra-checkpoints options using:

./target/release/zebra-checkpoints --help

For more details, see the zebra-checkpoints README.

zebrad-hash-lookup

Given a block hash the script will get additional information using zcash-cli.

$ echo "00000001f53a5e284393dfecf2a2405f62c07e2503047a28e2d1b6e76b25f863" | zebrad-hash-lookup
high: 3299
time: 2016-11-02T13:24:26Z
hash: 00000001f53a5e284393dfecf2a2405f62c07e2503047a28e2d1b6e76b25f863
prev: 00000001dbbb8b26eb92003086c5bd854e16d9f16e2e5b4fcc007b6b0ae57be3
next: 00000001ff3ac2b4ccb57d9fd2d1187475156489ae22337ca866bbafe62991a2
$

This program is commonly used as part of zebrad-log-filter where hashes will be captured from zebrad output.

zebrad-log-filter

The program is designed to filter the output from the zebra terminal or log file. Each time a hash is seen the script will capture it and get the additional information using zebrad-hash-lookup.

Assuming zebrad, zclash-cli, zebrad-hash-lookup and zebrad-log-filter are in your path the program can used as:

$ zebrad -v start | zebrad-log-filter
...
block::Hash("
high: 2800
time: 2016-11-01T16:17:16Z
hash: 00000001ecd754790237618cb79c4cd302e52571ecda7a80e6113c5e423c0e55
prev: 00000003ed8623d9499f4bf80f8bc410066194bf6813762b31560f9319205bf8
next: 00000001436277884eef900772f0fcec9566becccebaab4713fd665b60fab309
"))) max_checkpoint_height=Height(419581)
...