mnit-rtmc/mere

A low-latency directory mirroring service

Mere

Mere is a real-time file mirroring tool for Linux.

It has minimal runtime dependencies, using bundled versions of libssh2 and openssl.

Authentication happens using one of two methods:

1. Public key authentication using a private key from /home/{username}/.ssh/id_rsa. This only works if the file does not require a password.
2. Agent authentication, which should work when running interactively.

Building

First, install Perl modules required for OpenSSL:

• FindBin
• File/Compare
• IPC-Cmd

With cargo:

cargo build --release

Running

Usage: ./target/release/mere [OPTIONS]

A real-time file mirroring tool


Optional arguments:
  -h, --help       Print help message
  -d, --destination DESTINATION
                   Destination: <host> or <host>:<port>
  -p, --path PATH  Directory or file path (can be used multiple times)
  -w, --watch      Watch paths for changes using inotify

• --destination is required
• One or more --path arguments are required
• --watch uses inotify to watch each specified path, mirroring files which are closed after writing, deleted or moved.

Running as a systemd Service

As root:

cp ./target/release/mere /usr/local/bin/
cp ./mere.service /etc/systemd/system/

• Edit /etc/systemd/system/mere.service
• Replace {destination} and {path} on ExecStart=/usr/local/bin/mere line

systemctl enable mere
systemctl start mere

Check status with:

systemctl status mere

mere's Issues

Use sftp

Switch to sftp and check for remote files on startup.