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|
#!/bin/sh
# SPDX-FileCopyrightText: Copyright (C) 2025 Bruce Ashfield
#
# SPDX-License-Identifier: GPL-2.0-only
#
# vdkr-init.sh
# Init script for vdkr: execute arbitrary docker commands in QEMU
#
# This script runs on a real ext4 filesystem after switch_root from initramfs.
# The preinit script mounted /dev/vda (rootfs.img) and did switch_root to us.
#
# Drive layout (rootfs.img is always /dev/vda, mounted as /):
# /dev/vda = rootfs.img (this script runs from here, mounted as /)
# /dev/vdb = input disk (optional, OCI/tar/dir data)
# /dev/vdc = state disk (optional, persistent Docker storage)
#
# Kernel parameters:
# docker_cmd=<base64> Base64-encoded docker command + args
# docker_input=<type> Input type: none, oci, tar, dir (default: none)
# docker_output=<type> Output type: text, tar, storage (default: text)
# docker_state=<type> State type: none, disk (default: none)
# docker_network=1 Enable networking (configure eth0, DNS)
#
# Version: 2.3.0
# Set runtime-specific parameters before sourcing common code
VCONTAINER_RUNTIME_NAME="vdkr"
VCONTAINER_RUNTIME_CMD="docker"
VCONTAINER_RUNTIME_PREFIX="docker"
VCONTAINER_STATE_DIR="/var/lib/docker"
VCONTAINER_SHARE_NAME="vdkr_share"
VCONTAINER_VERSION="2.3.0"
# Source common init functions
# When installed as /init, common file is at /vcontainer-init-common.sh
. /vcontainer-init-common.sh
# ============================================================================
# Docker-Specific Functions
# ============================================================================
setup_docker_storage() {
mkdir -p /run/containerd /run/lock
mkdir -p /var/lib/docker
mkdir -p /var/lib/containerd
# Handle Docker storage
if [ -n "$STATE_DISK" ] && [ -b "$STATE_DISK" ]; then
log "Mounting state disk $STATE_DISK as /var/lib/docker..."
if mount -t ext4 "$STATE_DISK" /var/lib/docker 2>&1; then
log "SUCCESS: Mounted $STATE_DISK as Docker storage"
log "Docker storage contents:"
[ "$QUIET_BOOT" = "0" ] && ls -la /var/lib/docker/ 2>/dev/null || log "(empty)"
else
log "WARNING: Failed to mount state disk, using tmpfs"
RUNTIME_STATE="none"
fi
fi
# If no state disk, use tmpfs for Docker storage
if [ "$RUNTIME_STATE" != "disk" ]; then
log "Using tmpfs for Docker storage (ephemeral)..."
mount -t tmpfs -o size=1G tmpfs /var/lib/docker
fi
}
start_containerd() {
CONTAINERD_READY=false
if [ -x "/usr/bin/containerd" ]; then
log "Starting containerd..."
mkdir -p /var/lib/containerd
mkdir -p /run/containerd
/usr/bin/containerd --log-level info --root /var/lib/containerd --state /run/containerd >/tmp/containerd.log 2>&1 &
CONTAINERD_PID=$!
# Wait for containerd socket
for i in 1 2 3 4 5 6 7 8 9 10; do
if [ -S /run/containerd/containerd.sock ]; then
log "Containerd running (PID: $CONTAINERD_PID)"
CONTAINERD_READY=true
break
fi
sleep 1
done
if [ "$CONTAINERD_READY" != "true" ]; then
log "WARNING: Containerd failed to start, check /tmp/containerd.log"
[ -f /tmp/containerd.log ] && cat /tmp/containerd.log >&2
fi
fi
}
start_dockerd() {
log "Starting Docker daemon..."
DOCKER_OPTS="--data-root=/var/lib/docker"
DOCKER_OPTS="$DOCKER_OPTS --storage-driver=overlay2"
DOCKER_OPTS="$DOCKER_OPTS --iptables=false"
DOCKER_OPTS="$DOCKER_OPTS --userland-proxy=false"
DOCKER_OPTS="$DOCKER_OPTS --bridge=none"
DOCKER_OPTS="$DOCKER_OPTS --host=unix:///var/run/docker.sock"
DOCKER_OPTS="$DOCKER_OPTS --exec-opt native.cgroupdriver=cgroupfs"
DOCKER_OPTS="$DOCKER_OPTS --log-level=info"
if [ "$CONTAINERD_READY" = "true" ]; then
DOCKER_OPTS="$DOCKER_OPTS --containerd=/run/containerd/containerd.sock"
fi
/usr/bin/dockerd $DOCKER_OPTS >/dev/null 2>&1 &
DOCKER_PID=$!
log "Docker daemon started (PID: $DOCKER_PID)"
# Wait for Docker to be ready
log "Waiting for Docker daemon..."
DOCKER_READY=false
sleep 5
for i in $(seq 1 60); do
if ! kill -0 $DOCKER_PID 2>/dev/null; then
echo "===ERROR==="
echo "Docker daemon died after $i iterations"
cat /var/log/docker.log 2>/dev/null || true
dmesg | tail -20 2>/dev/null || true
sleep 2
reboot -f
fi
if /usr/bin/docker info >/dev/null 2>&1; then
log "Docker daemon is ready!"
DOCKER_READY=true
break
fi
log "Waiting... ($i/60)"
sleep 2
done
if [ "$DOCKER_READY" != "true" ]; then
echo "===ERROR==="
echo "Docker failed to start"
sleep 2
reboot -f
fi
}
stop_runtime_daemons() {
# Stop Docker daemon
if [ -n "$DOCKER_PID" ]; then
log "Stopping Docker daemon..."
kill $DOCKER_PID 2>/dev/null || true
for i in $(seq 1 10); do
if ! kill -0 $DOCKER_PID 2>/dev/null; then
log "Docker daemon stopped"
break
fi
sleep 1
done
fi
# Stop containerd
if [ -n "$CONTAINERD_PID" ]; then
log "Stopping containerd..."
kill $CONTAINERD_PID 2>/dev/null || true
sleep 2
fi
}
handle_storage_output() {
echo "Stopping Docker gracefully..."
/usr/bin/docker system prune -f >/dev/null 2>&1 || true
kill $DOCKER_PID 2>/dev/null || true
[ -n "$CONTAINERD_PID" ] && kill $CONTAINERD_PID 2>/dev/null || true
sleep 3
echo "Packaging Docker storage..."
cd /var/lib
tar -cf /tmp/storage.tar docker/
STORAGE_SIZE=$(stat -c%s /tmp/storage.tar 2>/dev/null || echo "0")
echo "Storage size: $STORAGE_SIZE bytes"
if [ "$STORAGE_SIZE" -gt 1000 ]; then
dmesg -n 1
echo "===STORAGE_START==="
base64 /tmp/storage.tar
echo "===STORAGE_END==="
echo "===EXIT_CODE=$EXEC_EXIT_CODE==="
else
echo "===ERROR==="
echo "Storage too small"
fi
}
# ============================================================================
# Main
# ============================================================================
# Initialize base environment
setup_base_environment
mount_base_filesystems
# Check for quiet boot mode
check_quiet_boot
log "=== vdkr Init ==="
log "Version: $VCONTAINER_VERSION"
# Mount tmpfs directories and cgroups
mount_tmpfs_dirs
setup_cgroups
# Parse kernel command line
parse_cmdline
# Detect and configure disks
detect_disks
# Set up Docker storage (Docker-specific)
setup_docker_storage
# Mount input disk
mount_input_disk
# Configure networking
configure_networking
# Start containerd and dockerd (Docker-specific)
start_containerd
start_dockerd
# Handle daemon mode or single command execution
if [ "$RUNTIME_DAEMON" = "1" ]; then
run_daemon_mode
else
prepare_input_path
execute_command
fi
# Graceful shutdown
graceful_shutdown
|
