Add docker image installation

Dockerfile

@@ -0,0 +1,45 @@
+FROM ubuntu:jammy-20240427
+
+SHELL ["/bin/bash", "-c"]
+
+WORKDIR /user/lib
+
+RUN apt-get update && \
+    apt-get install -y \
+    autoconf automake bzip2 ca-certificates cmake curl gcc-10 git jq libatlas-base-dev libc6-dev \
+    libedit-dev libglib2.0-dev libssl-dev libtool make ninja-build pkg-config python3 python3-pip \
+    sshfs udev zlib1g-dev
+RUN pip install -U pip && pip install meson
+RUN git clone https://github.com/libfuse/libfuse.git
+WORKDIR /user/lib/libfuse
+RUN git checkout fuse-3.16.2 && mkdir build
+WORKDIR /user/lib/libfuse/build
+RUN meson .. && ninja && ninja install && pip install --upgrade pip wheel && \
+    pip install git+https://github.com/inab/crypt4ghfs.git@v1.2.2 && \
+    echo "user_allow_other" >> /etc/fuse.conf
+
+WORKDIR /home
+RUN useradd -u 1000 -m -s /bin/bash application && mkdir -p /home/application/encrypted_files && \
+    chown application:application /home/application/encrypted_files && mkdir -p /home/application/clean_files && \
+    chown application:application /home/application/clean_files
+USER application
+WORKDIR /home/application
+
+ENV EGA_ENCRYPTED_FILES_MOUNTINGPOINT="/home/application/encrypted_files"
+ENV EGA_CLEAN_FILES_MOUNTINGPOINT="/home/application/clean_files"
+ENV USER_ID=1000
+ENV GROUP_ID=1000 
+ENV CRYP4GHFS_CONFIG="/tmp/fs.conf"
+RUN echo "[DEFAULT]" > $CRYP4GHFS_CONFIG && \
+    echo "rootdir=${EGA_ENCRYPTED_FILES_MOUNTINGPOINT}" >> $CRYP4GHFS_CONFIG && \
+    echo "log_level=DEBUG" >> $CRYP4GHFS_CONFIG && \
+    echo "include_crypt4gh_log=yes" >> $CRYP4GHFS_CONFIG && \
+    echo "[CRYPT4GH]" >> $CRYP4GHFS_CONFIG && \
+    echo "seckey=/tmp/ega_secret_key" >> $CRYP4GHFS_CONFIG && \
+    echo "[FUSE]" >> $CRYP4GHFS_CONFIG && \
+    echo "options=allow_other,default_permissions" >> $CRYP4GHFS_CONFIG
+
+RUN chmod 600 $CRYP4GHFS_CONFIG
+CMD sshfs -o reconnect -o BatchMode=yes -o IdentityFile="$USER_PRIVATE_KEY_FILE" \
+    -o allow_other -o default_permissions -o uid="$USER_ID" -o gid="$GROUP_ID" -o StrictHostKeyChecking=no -o \
+    UserKnownHostsFile=/dev/null "$EGA_USERNAME"@"$EGA_OUTBOX_ENDPOINT":./ "$EGA_ENCRYPTED_FILES_MOUNTINGPOINT" && crypt4ghfs -f --conf /tmp/fs.conf "$EGA_CLEAN_FILES_MOUNTINGPOINT"

README.md

@@ -83,3 +83,25 @@ For the (latest) SSHFS (v3.7), useful to test the above tips:
     meson ..
     ninja
     ninja install
+
+## Docker
+You may use Docker to mount encrypted EGA files using FUSE and decrypt them on-the-fly with your Crypt4GH private key:
+
+    docker build -t ega_crypt4ghfs:{tag}
+    docker run -d --name ega_crypt4ghfs_container \
+        -v /path/to/private.key:/tmp/ega_secret_key:ro \
+        -e USER_PRIVATE_KEY_FILE="/tmp/ega_secret_key" \
+        -e EGA_USERNAME="your_ega_username" \
+        -e EGA_OUTBOX_ENDPOINT="outbox.ega-archive.org" \
+        --device /dev/fuse:/dev/fuse \
+        --cap-add SYS_ADMIN \
+        --security-opt apparmor:unconfined \
+        ega_crypt4ghfs:{tag}
+
+Replace the placeholders:
+
+- `/path/to/private.key`: Local path to your Crypt4GH private key
+- `your_ega_username`: Your EGA account username
+- `EGA_OUTBOX_ENDPOINT`: Change to a custom endpoint if you're using a local EGA
+- `{tag}`: The tag of the image you want to use
+