Add Dockerfile and build instruction

.dockerignore

@@ -0,0 +1,9 @@
+__pycache__
+.mypy_cache
+.pytest_cache
+.vscode
+cvdupdate.egg-info
+/build
+/dist
+/tests
+.github

Dockerfile

@@ -0,0 +1,7 @@
+FROM python:3-slim
+RUN apt-get -y update \
+    && apt-get -y --no-install-recommends install cron gosu \
+    && rm -rf /var/lib/apt/lists/*
+COPY . /dist
+RUN pip install --no-cache-dir /dist
+ENTRYPOINT [ "/dist/scripts/docker-entrypoint.sh" ]

README.md

@@ -283,6 +283,47 @@ You can test it by running `freshclam` or `freshclam.exe` locally, where you've
 DatabaseMirror http://localhost:8000
 ```
 
+### Use docker
+
+Build docker image
+
+```bash
+docker build . --tag cvdupdate:latest
+```
+
+Run image, that will automaticly update databases in folder `/srv/cvdupdate` and write logs to `/var/log/cvdupdate`
+
+```bash
+docker run -d \
+  -v /srv/cvdupdate:/cvdupdate/database \
+  -v /var/log/cvdupdate:/cvdupdate/logs \
+  cvdupdate:latest
+```
+
+Run image, that will automaticly update databases in folder `/srv/cvdupdate`, write logs to `/var/log/cvdupdate` and set owner of files to user with ID 1000
+
+```bash
+docker run -d \
+  -v /srv/cvdupdate:/cvdupdate/database \
+  -v /var/log/cvdupdate:/cvdupdate/logs \
+  -e USER_ID=1000 \
+  cvdupdate:latest
+```
+
+Default update interval is `30 */4 * * *` (see [Cron Example](#cron-example))
+
+You may pass custom update interval in environment variable `CRON`
+
+For example - update every day in 00:00
+
+```bash
+docker run -d \
+  -v /srv/cvdupdate:/cvdupdate/database \
+  -v /var/log/cvdupdate:/cvdupdate/logs \
+  -e CRON='0 0 * * *' \
+  cvdupdate:latest
+  ```
+
 ## Contribute
 
 We'd love your help. There are many ways to contribute!

scripts/docker-entrypoint.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+USER_ID="${USER_ID:-0}"
+SCRIPT_PATH=$(readlink -f "$0")
+echo "ClamAV Private Database Mirror Updater Cron ${SCRIPT_PATH}"
+if [ "${USER_ID}" -ne "0" ]; then
+    echo "Creating user with ID ${USER_ID}"
+    useradd --create-home --home-dir /cvdupdate --uid "${USER_ID}" cvdupdate
+    chown -R "${USER_ID}" /cvdupdate
+    gosu cvdupdate cvdupdate config set --logdir /cvdupdate/logs
+    gosu cvdupdate cvdupdate config set --dbdir /cvdupdate/database
+else
+    mkdir -p /cvdupdate/{logs,database}
+    cvdupdate config set --logdir /cvdupdate/logs
+    cvdupdate config set --dbdir /cvdupdate/database
+fi
+
+if [ $# -eq 0 ]; then
+    set -e
+
+    echo "Adding crontab entry"
+    if [ "${USER_ID}" -ne "0" ]; then
+        crontab -l | {
+            cat
+            echo "${CRON:-"30 */4 * * *"} /usr/sbin/gosu cvdupdate /usr/local/bin/cvdupdate update >/proc/1/fd/1 2>/proc/1/fd/2"
+            echo "@reboot /usr/sbin/gosu cvdupdate /usr/local/bin/cvdupdate update >/proc/1/fd/1 2>/proc/1/fd/2"
+        } | crontab -
+    else
+        crontab -l | {
+            cat
+            echo "${CRON:-"30 */4 * * *"} /usr/local/bin/cvdupdate update >/proc/1/fd/1 2>/proc/1/fd/2"
+            echo "@reboot /usr/local/bin/cvdupdate update >/proc/1/fd/1 2>/proc/1/fd/2"
+        } | crontab -
+    fi
+    cron -f
+else
+    if [ "${USER_ID}" -ne "0" ]; then
+        exec gosu cvdupdate "$@"
+    else
+        exec "$@"
+    fi
+fi