werkator/docs/deployment.md

GitTally Deployment

This document describes how to run GitTally as a permanent service. The recommended setup is a systemd user service behind an existing reverse proxy. By default GitTally does not manage nginx or TLS certificates itself; it relies on the host's existing web server and certbot. For hosts without one, an opt-in managed nginx/TLS container is available, see Hosts Without a Reverse Proxy.

Prerequisites

• Linux with systemd.
• Java runtime (JRE 21) — or none, when using the self-contained runtime bundle, see Hosts Without a Java Runtime.
• git CLI on the PATH.
• docker CLI on the PATH, only if any branch uses docker.enabled (see configuration.md).
• A checked-out working tree of the repository to watch, with a remote named origin.

Jar Location Convention

Build the executable jar once:

./gradlew build
ls build/libs/gittally.jar

Copy the jar to a stable path outside any watched repository, by convention ~/bin/gittally.jar:

mkdir -p ~/bin
cp build/libs/gittally.jar ~/bin/gittally.jar

The systemd unit generated below points at the jar that was used to run init --systemd. So always run it via the stable path, not via build/libs/.

Install the Service

Initialize GitTally in the repository to watch (see bootstrapping.md for details):

cd /path/to/repo
java -jar ~/bin/gittally.jar init
# fill in git.account and git.token in .git/gittally/.gittally.yml
# review .gittally.yml

Generate the systemd user unit:

java -jar ~/bin/gittally.jar init --systemd

This writes .git/gittally/gittally-<repo-name>.service and .git/gittally/gittally.env and prints the install commands:

ln -sf /path/to/repo/.git/gittally/gittally-<repo-name>.service ~/.config/systemd/user/gittally-<repo-name>.service
systemctl --user daemon-reload
systemctl --user enable --now gittally-<repo-name>.service

The unit runs java -jar ~/bin/gittally.jar server with the repository as working directory and Restart=always. The unit name contains the repository name, so several repositories can be served by one host, each with its own service and port.

Expect a burst of builds right after the very first start: in a fresh clone every origin branch counts as new, so each branch with commits younger than watcher.newBranchMaxAge (default 5d) is built once — one build per branch, executed serially up to builds.maxConcurrent. Lower watcher.newBranchMaxAge before the first start, or enable requirePullRequest, to limit the initial backlog.

User services stop at logout unless lingering is enabled once per user:

loginctl enable-linger "$USER"

Operating the Service

systemctl --user status gittally-<repo-name>.service     # state and last log lines
journalctl --user -u gittally-<repo-name>.service -f     # follow the log
systemctl --user restart gittally-<repo-name>.service    # restart (e.g. after config changes)
systemctl --user stop gittally-<repo-name>.service       # stop

To update GitTally, replace ~/bin/gittally.jar and restart the service.

Environment File

.git/gittally/gittally.env is loaded by the unit as EnvironmentFile. It only tunes the JVM process, e.g. JAVA_OPTS=-Xmx256m. All GitTally configuration lives in the YAML files described in configuration.md, not in environment variables. init --systemd never overwrites an existing environment file.

Reverse Proxy (nginx)

Bind GitTally to localhost and set the public URL in .gittally.yml:

server:
  bindAddress: 127.0.0.1
  port: 18080
  publicBaseUrl: "https://ci.example.org/"

publicBaseUrl is used for all links posted to Gitea, so it must be the externally reachable URL.

Add a server block to the host's nginx:

server {
    listen 443 ssl;
    server_name ci.example.org;

    ssl_certificate     /etc/letsencrypt/live/ci.example.org/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/ci.example.org/privkey.pem;

    location / {
        proxy_pass http://127.0.0.1:18080;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}

Obtain and renew the certificate with the host's existing certbot, e.g.:

sudo certbot --nginx -d ci.example.org

This replaces the legacy script's managed nginx/Let's Encrypt Docker container for hosts that have their own web server.

Hosts Without a Java Runtime (Runtime Bundle)

Some hosts provide git and Docker but no Java runtime and no way to install one, e.g. Hostsharing container servers. For these, GitTally ships as a self-contained runtime bundle: a jlink-trimmed JRE, gittally.jar, and a launcher script in one tarball (ADR 0006).

Build the bundle on a Linux x86_64 machine whose glibc is not newer than the target's:

./gradlew runtimeBundle
ls build/distributions/gittally-runtime-linux-x64.tar.gz

Copy and unpack it on the target host, by convention to ~/opt/gittally:

scp build/distributions/gittally-runtime-linux-x64.tar.gz user@host:/tmp/
ssh user@host 'mkdir -p ~/opt && tar -xzf /tmp/gittally-runtime-linux-x64.tar.gz -C ~/opt'

Then use ~/opt/gittally/bin/gittally wherever this document says java -jar ~/bin/gittally.jar:

cd /path/to/repo
~/opt/gittally/bin/gittally init
~/opt/gittally/bin/gittally init --systemd

init --systemd detects the bundle automatically: the generated unit's ExecStart points at the bundle's jre/bin/java and lib/gittally.jar, so the install commands printed by init --systemd work unchanged. JAVA_OPTS from the environment file applies as usual.

To update GitTally, stop the service, unpack the new bundle over ~/opt/gittally, and restart the service.

Hosts Without a Reverse Proxy (Managed nginx/TLS)

Some hosts provide Docker but no root access and no host web server, e.g. Hostsharing managed container environments. For these, GitTally can manage its own nginx+certbot Docker container (ADR 0005). This is opt-in; where a host web server exists, prefer the reverse-proxy setup above.

Enable it in the server section of the configuration:

server:
  port: 18080
  nginx:
    enabled: true
    serverName: ci.example.org
    httpPort: 8080
    httpsPort: 8443
    letsencryptEmail: admin@example.org

On server start, GitTally writes the nginx configuration, starts a labelled nginx container publishing httpPort and httpsPort, obtains a Let's Encrypt certificate via a certbot container (webroot mode), and restarts nginx with the full HTTPS configuration. A renewal check runs daily; certificates and nginx state persist in server.nginx.stateDir across restarts. On shutdown the container is removed. All nginx and certificate failures are non-fatal warnings — the plain HTTP server keeps running without the proxy.

serverName must be a public DNS name pointing at the host, reachable from the internet on port 80/443 (directly or via a port forward to httpPort/httpsPort), otherwise the ACME challenge fails. The nginx container cannot reach localhost of the host, so the proxy upstream defaults to serverName; set server.nginx.upstreamHost if the host is reachable under a different name from inside containers. With the managed nginx, keep server.bindAddress: 0.0.0.0 (or an address reachable from the Docker network) — binding GitTally to 127.0.0.1 would make it unreachable for the proxy. See configuration.md for all server.nginx.* keys.