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v0.0.1 (#8)

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Co-authored-by: Tasnim Kabir Sadik <tksadik92@gmail.com>
Reviewed-on: wrenn/sandbox#8
This commit is contained in:
Rafeed M. Bhuiyan
2026-04-09 19:24:49 +00:00
parent 32e5a5a715
commit d3e4812e46
199 changed files with 24552 additions and 2776 deletions
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30
scripts/rootfs-from-container.sh
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@ -3,7 +3,10 @@
# rootfs-from-container.sh — Create a bootable Wrenn rootfs from a Docker container.
#
# Exports a container's filesystem, writes it into an ext4 image, injects
# envd + wrenn-init, and shrinks the image to minimum size.
# envd + wrenn-init + tini, and shrinks the image to minimum size.
#
# The container image must already include: socat, chrony, curl, ca-certificates, git.
# These are installed via apt in the container before export, not injected here.
#
# Usage:
# bash scripts/rootfs-from-container.sh <container> <image_name>
@ -13,7 +16,7 @@
# image_name — Directory name under images dir (e.g. "waitlist")
#
# Output:
# ${AGENT_FILES_ROOTDIR}/images/<image_name>/rootfs.ext4
# ${WRENN_DIR}/images/<image_name>/rootfs.ext4
#
# Requires: docker, mkfs.ext4, resize2fs, e2fsck, make (for building envd), curl (for tini download)
# Sudo is used only for mount/umount/copy-into-image operations.
@ -22,8 +25,8 @@ set -euo pipefail
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PROJECT_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
AGENT_FILES_ROOTDIR="${AGENT_FILES_ROOTDIR:-/var/lib/wrenn}"
AGENT_IMAGES_PATH="${AGENT_FILES_ROOTDIR}/images"
WRENN_DIR="${WRENN_DIR:-/var/lib/wrenn}"
WRENN_IMAGES_PATH="${WRENN_DIR}/images"
if [ $# -lt 2 ]; then
echo "Usage: $0 <container> <image_name>"
@ -32,7 +35,7 @@ fi
CONTAINER="$1"
IMAGE_NAME="$2"
OUTPUT_DIR="${AGENT_IMAGES_PATH}/${IMAGE_NAME}"
OUTPUT_DIR="${WRENN_IMAGES_PATH}/${IMAGE_NAME}"
OUTPUT_FILE="${OUTPUT_DIR}/rootfs.ext4"
MOUNT_DIR="/tmp/wrenn-rootfs-build"
TAR_FILE="/tmp/wrenn-rootfs-export-${IMAGE_NAME}.tar"
@ -130,16 +133,29 @@ sudo mkdir -p "${MOUNT_DIR}/sbin"
sudo cp "${TINI_BIN}" "${MOUNT_DIR}/sbin/tini"
sudo chmod 755 "${MOUNT_DIR}/sbin/tini"
# Step 6: Verify.
# Step 6: Verify injected binaries and required container packages.
echo ""
echo "==> Installed guest binaries:"
ls -la "${MOUNT_DIR}/usr/local/bin/envd" "${MOUNT_DIR}/usr/local/bin/wrenn-init" "${MOUNT_DIR}/sbin/tini"
echo ""
echo "==> Checking required container packages..."
MISSING_PKGS=""
for bin in socat chronyd curl git; do
if ! find "${MOUNT_DIR}" -name "${bin}" -type f 2>/dev/null | head -1 | grep -q .; then
MISSING_PKGS="${MISSING_PKGS} ${bin}"
fi
done
if [ -n "${MISSING_PKGS}" ]; then
echo "WARNING: The following binaries were not found in the container image:${MISSING_PKGS}"
echo " Install them in the container (via apt) before exporting."
fi
# Unmount before shrinking.
sudo umount "${MOUNT_DIR}"
rmdir "${MOUNT_DIR}" 2>/dev/null || true
# Step 7: Shrink the image to minimum size.
# Step 8: Shrink the image to minimum size.
echo ""
echo "==> Shrinking image..."
sudo e2fsck -fy "${OUTPUT_FILE}"