Add a Dockerfile and build instructions

.dockerignore

@@ -0,0 +1,4 @@
+fuzz/hfuzz_target
+fuzz/hfuzz_workspace
+fuzz/target
+target

README.md

@@ -5,6 +5,29 @@ The anti-replay oracle used under the [Revault architecture](https://github.com/
 ## Usage
 `cosignerd` must be used along with `revaultd`. Check `revaultd's` [tutorial](https://github.com/revault/revaultd/tree/master/doc/USAGE.md) to get started!
 
+You can build it like any other Rust project, using Cargo:
+```
+git clone https://github.com/revault/cosignerd
+cd cosignerd && cargo build
+```
+
+You'll need a configuration file to start it. You can find an example at
+[`contrib/config.toml`](contrib/config.toml):
+```
+cargo run -- --conf ./contrib/config.toml
+```
+
+For testing purpose and/or running `cosignerd` on a non-UNIX system you can use Docker:
+```
+# From the root of the repository
+docker build -t cosignerd -f contrib/cosignerd.Dockerfile .
+docker run --rm --name cosignerd cosignerd
+```
+The configuration is here passed through environment variables:
+```
+docker run -it --rm --name cosignerd -e NOISE_SECRET="\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02" -e BITCOIN_SECRET="\x43\xff\x32\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\81\x01" -e MANAGERS_NOISE_KEYS="e798cf79e7245f06f62cc76609d51c76d42f3da4fab831f543f3254e5c6d7dc7 a19052df1337936e549a6b830ff4cc0e9028eaf6e79779de76d200e3b201953b cebbe8b9edadab14f23dbe1f4f0d55c7a3e9de13ab9adbe4aefacdc26f7c7dd1" -e LOG_LEVEL="debug" cosignerd
+```
+
 ## Licence
 
 BSD 3-clauses, see [LICENSE](LICENSE).

contrib/cosignerd.Dockerfile

@@ -0,0 +1,29 @@
+FROM rust:alpine
+
+# Space separated list of managers' noise keys. Must be set at startup, that's a dummy key.
+ENV MANAGERS_NOISE_KEYS="b28cf2091bbbecf347d29420f884a936713e7b2e86fe4f6653d7e12356d26114"
+# Bitcoin and Noise private keys
+ENV BITCOIN_SECRET="\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x42"
+ENV NOISE_SECRET="\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x42"
+# Other config options
+ENV LOG_LEVEL="trace"
+
+
+COPY . /srv/cosignerd/src
+RUN apk add g++ make && \
+    cd /srv/cosignerd/src && \
+    RUSTFLAGS="-C target-feature=-crt-static" cargo build
+
+EXPOSE 8383/tcp
+
+CMD echo "daemon = false" >> /srv/cosignerd/config.toml && \
+    echo "data_dir = '/srv/cosignerd/datadir'" >> /srv/cosignerd/config.toml && \
+    echo "log_level = '$LOG_LEVEL'" >> /srv/cosignerd/config.toml && \
+    for key in $MANAGERS_NOISE_KEYS; do \
+        echo "[[managers]]" >> /srv/cosignerd/config.toml && \
+        echo "noise_key = \"$key\"" >> /srv/cosignerd/config.toml \
+    ; done && \
+    mkdir /srv/cosignerd/datadir && \
+    printf $BITCOIN_SECRET > /srv/cosignerd/datadir/bitcoin_secret && \
+    printf $NOISE_SECRET > /srv/cosignerd/datadir/noise_secret && \
+    /srv/cosignerd/src/target/debug/cosignerd --conf /srv/cosignerd/config.toml