build(images): add the guest kernel config, the Ubuntu 24.04 image and build scripts

commit: c37a8f59dea3af5ee1a1c68ce0b802faca45c179
author: brice · 9d ago · 2026-10-12 15:35 UTC
parent: 885c03f
signature: GPG VerifiedCD88F9E564E0102646FB6077A1A07C7C7C3E349D · arch-gpg Verified for the committer email

6 files · +361 -0

A images/kernel/config-6.18 +163 -0

@@ -0,0 +1,163 @@
	1	+	# Minimal Linux 6.18 guest configuration for Firecracker micro-VMs running
	2	+	# Docker (ermite-runner). This is a configuration fragment: scripts/build-kernel.sh
	3	+	# merges it over `make tinyconfig` and resolves dependencies with olddefconfig,
	4	+	# then fails if an option listed here did not survive. Per-architecture options
	5	+	# are in config-6.18.x86_64 and config-6.18.arm64, merged after this file.
	6	+
	7	+	# --- Core ---
	8	+	CONFIG_64BIT=y
	9	+	CONFIG_SMP=y
	10	+	CONFIG_NR_CPUS=64
	11	+	CONFIG_EXPERT=y
	12	+	CONFIG_PRINTK=y
	13	+	CONFIG_PRINTK_TIME=y
	14	+	CONFIG_KALLSYMS=y
	15	+	CONFIG_BUG=y
	16	+	CONFIG_TTY=y
	17	+	CONFIG_UNIX98_PTYS=y
	18	+	CONFIG_MULTIUSER=y
	19	+	CONFIG_FUTEX=y
	20	+	CONFIG_EPOLL=y
	21	+	CONFIG_EVENTFD=y
	22	+	CONFIG_SIGNALFD=y
	23	+	CONFIG_TIMERFD=y
	24	+	CONFIG_AIO=y
	25	+	CONFIG_FHANDLE=y
	26	+	CONFIG_FILE_LOCKING=y
	27	+	CONFIG_ADVISE_SYSCALLS=y
	28	+	CONFIG_MEMBARRIER=y
	29	+	CONFIG_POSIX_TIMERS=y
	30	+	CONFIG_HIGH_RES_TIMERS=y
	31	+	CONFIG_NO_HZ_IDLE=y
	32	+	CONFIG_BINFMT_ELF=y
	33	+	CONFIG_BINFMT_SCRIPT=y
	34	+	CONFIG_SYSVIPC=y
	35	+	CONFIG_POSIX_MQUEUE=y
	36	+	CONFIG_KEYS=y
	37	+	CONFIG_SECCOMP=y
	38	+	CONFIG_SECCOMP_FILTER=y
	39	+	CONFIG_BPF_SYSCALL=y
	40	+	CONFIG_BPF_JIT=y
	41	+	CONFIG_INOTIFY_USER=y
	42	+	CONFIG_FANOTIFY=y
	43	+	CONFIG_SHMEM=y
	44	+	CONFIG_MODULES=n
	45	+
	46	+	# --- Guest basics (x86-64 only options live in config-6.18.x86_64) ---
	47	+	CONFIG_SERIAL_8250=y
	48	+	CONFIG_SERIAL_8250_CONSOLE=y
	49	+	CONFIG_HW_RANDOM=y
	50	+	CONFIG_HW_RANDOM_VIRTIO=y
	51	+
	52	+	# --- virtio (Firecracker uses virtio-mmio) ---
	53	+	CONFIG_VIRTIO_MENU=y
	54	+	CONFIG_VIRTIO=y
	55	+	CONFIG_VIRTIO_MMIO=y
	56	+	CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES=y
	57	+	CONFIG_VIRTIO_BLK=y
	58	+	CONFIG_VIRTIO_NET=y
	59	+	CONFIG_VSOCKETS=y
	60	+	CONFIG_VIRTIO_VSOCKETS=y
	61	+
	62	+	# --- Block, filesystems ---
	63	+	CONFIG_BLOCK=y
	64	+	CONFIG_BLK_DEV=y
	65	+	CONFIG_PROC_FS=y
	66	+	CONFIG_PROC_SYSCTL=y
	67	+	CONFIG_SYSFS=y
	68	+	CONFIG_TMPFS=y
	69	+	CONFIG_TMPFS_POSIX_ACL=y
	70	+	CONFIG_TMPFS_XATTR=y
	71	+	CONFIG_DEVTMPFS=y
	72	+	CONFIG_DEVTMPFS_MOUNT=y
	73	+	CONFIG_SYSCTL=y
	74	+	CONFIG_EXT4_FS=y
	75	+	CONFIG_EXT4_FS_POSIX_ACL=y
	76	+	CONFIG_EXT4_FS_SECURITY=y
	77	+	CONFIG_OVERLAY_FS=y
	78	+	CONFIG_FUSE_FS=y
	79	+	CONFIG_CRYPTO=y
	80	+	CONFIG_CRYPTO_CRC32C=y
	81	+
	82	+	# --- Namespaces and cgroups v2 (Docker, runc) ---
	83	+	CONFIG_NAMESPACES=y
	84	+	CONFIG_UTS_NS=y
	85	+	CONFIG_IPC_NS=y
	86	+	CONFIG_USER_NS=y
	87	+	CONFIG_PID_NS=y
	88	+	CONFIG_NET_NS=y
	89	+	CONFIG_TIME_NS=y
	90	+	CONFIG_CGROUPS=y
	91	+	CONFIG_CGROUP_PIDS=y
	92	+	CONFIG_CGROUP_SCHED=y
	93	+	CONFIG_FAIR_GROUP_SCHED=y
	94	+	CONFIG_CFS_BANDWIDTH=y
	95	+	CONFIG_CPUSETS=y
	96	+	CONFIG_MEMCG=y
	97	+	CONFIG_BLK_CGROUP=y
	98	+	CONFIG_CGROUP_DEVICE=y
	99	+	CONFIG_CGROUP_FREEZER=y
	100	+	CONFIG_CGROUP_CPUACCT=y
	101	+	CONFIG_CGROUP_BPF=y
	102	+	CONFIG_HUGETLBFS=y
	103	+	CONFIG_HUGETLB_PAGE=y
	104	+	CONFIG_CGROUP_HUGETLB=y
	105	+
	106	+	# --- Network ---
	107	+	CONFIG_NET=y
	108	+	CONFIG_NETDEVICES=y
	109	+	CONFIG_NET_CORE=y
	110	+	CONFIG_INET=y
	111	+	CONFIG_IP_PNP=y
	112	+	CONFIG_IPV6=y
	113	+	CONFIG_UNIX=y
	114	+	CONFIG_PACKET=y
	115	+	CONFIG_TUN=y
	116	+	CONFIG_VETH=y
	117	+	CONFIG_BRIDGE=y
	118	+	CONFIG_BRIDGE_NETFILTER=y
	119	+	CONFIG_VLAN_8021Q=y
	120	+	CONFIG_INET_DIAG=y
	121	+	CONFIG_INET_UDP_DIAG=y
	122	+	CONFIG_UNIX_DIAG=y
	123	+	CONFIG_NETLINK_DIAG=y
	124	+	CONFIG_SYN_COOKIES=y
	125	+
	126	+	# --- netfilter: nftables, iptables compatibility, NAT ---
	127	+	CONFIG_NETFILTER=y
	128	+	CONFIG_NETFILTER_ADVANCED=y
	129	+	CONFIG_NETFILTER_NETLINK=y
	130	+	CONFIG_NF_CONNTRACK=y
	131	+	CONFIG_NF_NAT=y
	132	+	CONFIG_NF_TABLES=y
	133	+	CONFIG_NF_TABLES_INET=y
	134	+	CONFIG_NF_TABLES_IPV4=y
	135	+	CONFIG_NFT_CT=y
	136	+	CONFIG_NFT_NAT=y
	137	+	CONFIG_NFT_MASQ=y
	138	+	CONFIG_NFT_REJECT=y
	139	+	CONFIG_NFT_LIMIT=y
	140	+	CONFIG_NFT_LOG=y
	141	+	CONFIG_NFT_COMPAT=y
	142	+	CONFIG_NETFILTER_XTABLES=y
	143	+	CONFIG_NETFILTER_XTABLES_LEGACY=y
	144	+	CONFIG_NETFILTER_XT_NAT=y
	145	+	CONFIG_NETFILTER_XT_MARK=y
	146	+	CONFIG_NETFILTER_XT_CONNMARK=y
	147	+	CONFIG_NETFILTER_XT_TARGET_MASQUERADE=y
	148	+	CONFIG_NETFILTER_XT_TARGET_MARK=y
	149	+	CONFIG_NETFILTER_XT_TARGET_CHECKSUM=y
	150	+	CONFIG_NETFILTER_XT_TARGET_CONNMARK=y
	151	+	CONFIG_NETFILTER_XT_MATCH_ADDRTYPE=y
	152	+	CONFIG_NETFILTER_XT_MATCH_CONNTRACK=y
	153	+	CONFIG_NETFILTER_XT_MATCH_COMMENT=y
	154	+	CONFIG_NETFILTER_XT_MATCH_MARK=y
	155	+	CONFIG_NETFILTER_XT_MATCH_MULTIPORT=y
	156	+	CONFIG_IP_NF_IPTABLES_LEGACY=y
	157	+	CONFIG_IP_NF_IPTABLES=y
	158	+	CONFIG_IP_NF_FILTER=y
	159	+	CONFIG_IP_NF_MANGLE=y
	160	+	CONFIG_IP_NF_RAW=y
	161	+	CONFIG_IP_NF_NAT=y
	162	+	CONFIG_IP_NF_TARGET_MASQUERADE=y
	163	+	CONFIG_IP_NF_TARGET_REJECT=y

@@ -0,0 +1,163 @@
	1	+	# Minimal Linux 6.18 guest configuration for Firecracker micro-VMs running
	2	+	# Docker (ermite-runner). This is a configuration fragment: scripts/build-kernel.sh
	3	+	# merges it over `make tinyconfig` and resolves dependencies with olddefconfig,
	4	+	# then fails if an option listed here did not survive. Per-architecture options
	5	+	# are in config-6.18.x86_64 and config-6.18.arm64, merged after this file.
	6	+
	7	+	# --- Core ---
	8	+	CONFIG_64BIT=y
	9	+	CONFIG_SMP=y
	10	+	CONFIG_NR_CPUS=64
	11	+	CONFIG_EXPERT=y
	12	+	CONFIG_PRINTK=y
	13	+	CONFIG_PRINTK_TIME=y
	14	+	CONFIG_KALLSYMS=y
	15	+	CONFIG_BUG=y
	16	+	CONFIG_TTY=y
	17	+	CONFIG_UNIX98_PTYS=y
	18	+	CONFIG_MULTIUSER=y
	19	+	CONFIG_FUTEX=y
	20	+	CONFIG_EPOLL=y
	21	+	CONFIG_EVENTFD=y
	22	+	CONFIG_SIGNALFD=y
	23	+	CONFIG_TIMERFD=y
	24	+	CONFIG_AIO=y
	25	+	CONFIG_FHANDLE=y
	26	+	CONFIG_FILE_LOCKING=y
	27	+	CONFIG_ADVISE_SYSCALLS=y
	28	+	CONFIG_MEMBARRIER=y
	29	+	CONFIG_POSIX_TIMERS=y
	30	+	CONFIG_HIGH_RES_TIMERS=y
	31	+	CONFIG_NO_HZ_IDLE=y
	32	+	CONFIG_BINFMT_ELF=y
	33	+	CONFIG_BINFMT_SCRIPT=y
	34	+	CONFIG_SYSVIPC=y
	35	+	CONFIG_POSIX_MQUEUE=y
	36	+	CONFIG_KEYS=y
	37	+	CONFIG_SECCOMP=y
	38	+	CONFIG_SECCOMP_FILTER=y
	39	+	CONFIG_BPF_SYSCALL=y
	40	+	CONFIG_BPF_JIT=y
	41	+	CONFIG_INOTIFY_USER=y
	42	+	CONFIG_FANOTIFY=y
	43	+	CONFIG_SHMEM=y
	44	+	CONFIG_MODULES=n
	45	+
	46	+	# --- Guest basics (x86-64 only options live in config-6.18.x86_64) ---
	47	+	CONFIG_SERIAL_8250=y
	48	+	CONFIG_SERIAL_8250_CONSOLE=y
	49	+	CONFIG_HW_RANDOM=y
	50	+	CONFIG_HW_RANDOM_VIRTIO=y
	51	+
	52	+	# --- virtio (Firecracker uses virtio-mmio) ---
	53	+	CONFIG_VIRTIO_MENU=y
	54	+	CONFIG_VIRTIO=y
	55	+	CONFIG_VIRTIO_MMIO=y
	56	+	CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES=y
	57	+	CONFIG_VIRTIO_BLK=y
	58	+	CONFIG_VIRTIO_NET=y
	59	+	CONFIG_VSOCKETS=y
	60	+	CONFIG_VIRTIO_VSOCKETS=y
	61	+
	62	+	# --- Block, filesystems ---
	63	+	CONFIG_BLOCK=y
	64	+	CONFIG_BLK_DEV=y
	65	+	CONFIG_PROC_FS=y
	66	+	CONFIG_PROC_SYSCTL=y
	67	+	CONFIG_SYSFS=y
	68	+	CONFIG_TMPFS=y
	69	+	CONFIG_TMPFS_POSIX_ACL=y
	70	+	CONFIG_TMPFS_XATTR=y
	71	+	CONFIG_DEVTMPFS=y
	72	+	CONFIG_DEVTMPFS_MOUNT=y
	73	+	CONFIG_SYSCTL=y
	74	+	CONFIG_EXT4_FS=y
	75	+	CONFIG_EXT4_FS_POSIX_ACL=y
	76	+	CONFIG_EXT4_FS_SECURITY=y
	77	+	CONFIG_OVERLAY_FS=y
	78	+	CONFIG_FUSE_FS=y
	79	+	CONFIG_CRYPTO=y
	80	+	CONFIG_CRYPTO_CRC32C=y
	81	+
	82	+	# --- Namespaces and cgroups v2 (Docker, runc) ---
	83	+	CONFIG_NAMESPACES=y
	84	+	CONFIG_UTS_NS=y
	85	+	CONFIG_IPC_NS=y
	86	+	CONFIG_USER_NS=y
	87	+	CONFIG_PID_NS=y
	88	+	CONFIG_NET_NS=y
	89	+	CONFIG_TIME_NS=y
	90	+	CONFIG_CGROUPS=y
	91	+	CONFIG_CGROUP_PIDS=y
	92	+	CONFIG_CGROUP_SCHED=y
	93	+	CONFIG_FAIR_GROUP_SCHED=y
	94	+	CONFIG_CFS_BANDWIDTH=y
	95	+	CONFIG_CPUSETS=y
	96	+	CONFIG_MEMCG=y
	97	+	CONFIG_BLK_CGROUP=y
	98	+	CONFIG_CGROUP_DEVICE=y
	99	+	CONFIG_CGROUP_FREEZER=y
	100	+	CONFIG_CGROUP_CPUACCT=y
	101	+	CONFIG_CGROUP_BPF=y
	102	+	CONFIG_HUGETLBFS=y
	103	+	CONFIG_HUGETLB_PAGE=y
	104	+	CONFIG_CGROUP_HUGETLB=y
	105	+
	106	+	# --- Network ---
	107	+	CONFIG_NET=y
	108	+	CONFIG_NETDEVICES=y
	109	+	CONFIG_NET_CORE=y
	110	+	CONFIG_INET=y
	111	+	CONFIG_IP_PNP=y
	112	+	CONFIG_IPV6=y
	113	+	CONFIG_UNIX=y
	114	+	CONFIG_PACKET=y
	115	+	CONFIG_TUN=y
	116	+	CONFIG_VETH=y
	117	+	CONFIG_BRIDGE=y
	118	+	CONFIG_BRIDGE_NETFILTER=y
	119	+	CONFIG_VLAN_8021Q=y
	120	+	CONFIG_INET_DIAG=y
	121	+	CONFIG_INET_UDP_DIAG=y
	122	+	CONFIG_UNIX_DIAG=y
	123	+	CONFIG_NETLINK_DIAG=y
	124	+	CONFIG_SYN_COOKIES=y
	125	+
	126	+	# --- netfilter: nftables, iptables compatibility, NAT ---
	127	+	CONFIG_NETFILTER=y
	128	+	CONFIG_NETFILTER_ADVANCED=y
	129	+	CONFIG_NETFILTER_NETLINK=y
	130	+	CONFIG_NF_CONNTRACK=y
	131	+	CONFIG_NF_NAT=y
	132	+	CONFIG_NF_TABLES=y
	133	+	CONFIG_NF_TABLES_INET=y
	134	+	CONFIG_NF_TABLES_IPV4=y
	135	+	CONFIG_NFT_CT=y
	136	+	CONFIG_NFT_NAT=y
	137	+	CONFIG_NFT_MASQ=y
	138	+	CONFIG_NFT_REJECT=y
	139	+	CONFIG_NFT_LIMIT=y
	140	+	CONFIG_NFT_LOG=y
	141	+	CONFIG_NFT_COMPAT=y
	142	+	CONFIG_NETFILTER_XTABLES=y
	143	+	CONFIG_NETFILTER_XTABLES_LEGACY=y
	144	+	CONFIG_NETFILTER_XT_NAT=y
	145	+	CONFIG_NETFILTER_XT_MARK=y
	146	+	CONFIG_NETFILTER_XT_CONNMARK=y
	147	+	CONFIG_NETFILTER_XT_TARGET_MASQUERADE=y
	148	+	CONFIG_NETFILTER_XT_TARGET_MARK=y
	149	+	CONFIG_NETFILTER_XT_TARGET_CHECKSUM=y
	150	+	CONFIG_NETFILTER_XT_TARGET_CONNMARK=y
	151	+	CONFIG_NETFILTER_XT_MATCH_ADDRTYPE=y
	152	+	CONFIG_NETFILTER_XT_MATCH_CONNTRACK=y
	153	+	CONFIG_NETFILTER_XT_MATCH_COMMENT=y
	154	+	CONFIG_NETFILTER_XT_MATCH_MARK=y
	155	+	CONFIG_NETFILTER_XT_MATCH_MULTIPORT=y
	156	+	CONFIG_IP_NF_IPTABLES_LEGACY=y
	157	+	CONFIG_IP_NF_IPTABLES=y
	158	+	CONFIG_IP_NF_FILTER=y
	159	+	CONFIG_IP_NF_MANGLE=y
	160	+	CONFIG_IP_NF_RAW=y
	161	+	CONFIG_IP_NF_NAT=y
	162	+	CONFIG_IP_NF_TARGET_MASQUERADE=y
	163	+	CONFIG_IP_NF_TARGET_REJECT=y

A images/kernel/config-6.18.arm64 +11 -0

@@ -0,0 +1,11 @@
	1	+	# arm64 specific guest options, merged after config-6.18. Not exercised in CI-1
	2	+	# (no arm64 host); kept so that the build is reproducible there.
	3	+	CONFIG_ARM64=y
	4	+	CONFIG_ARM64_VA_BITS_48=y
	5	+	CONFIG_ARM_GIC_V3=y
	6	+	CONFIG_ARM_PSCI_FW=y
	7	+	CONFIG_ARM_ARCH_TIMER=y
	8	+	CONFIG_SERIAL_AMBA_PL011=y
	9	+	CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
	10	+	CONFIG_RTC_CLASS=y
	11	+	CONFIG_RTC_DRV_PL031=y

@@ -0,0 +1,11 @@
	1	+	# arm64 specific guest options, merged after config-6.18. Not exercised in CI-1
	2	+	# (no arm64 host); kept so that the build is reproducible there.
	3	+	CONFIG_ARM64=y
	4	+	CONFIG_ARM64_VA_BITS_48=y
	5	+	CONFIG_ARM_GIC_V3=y
	6	+	CONFIG_ARM_PSCI_FW=y
	7	+	CONFIG_ARM_ARCH_TIMER=y
	8	+	CONFIG_SERIAL_AMBA_PL011=y
	9	+	CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
	10	+	CONFIG_RTC_CLASS=y
	11	+	CONFIG_RTC_DRV_PL031=y

A images/kernel/config-6.18.x86_64 +11 -0

@@ -0,0 +1,11 @@
	1	+	# x86-64 specific guest options, merged after config-6.18.
	2	+	CONFIG_HYPERVISOR_GUEST=y
	3	+	CONFIG_PARAVIRT=y
	4	+	CONFIG_KVM_GUEST=y
	5	+	CONFIG_IA32_EMULATION=y
	6	+	CONFIG_SERIO=y
	7	+	CONFIG_SERIO_I8042=y
	8	+	CONFIG_ACPI=y
	9	+	CONFIG_X86_MPPARSE=y
	10	+	CONFIG_X86_LOCAL_APIC=y
	11	+	CONFIG_X86_IO_APIC=y

@@ -0,0 +1,11 @@
	1	+	# x86-64 specific guest options, merged after config-6.18.
	2	+	CONFIG_HYPERVISOR_GUEST=y
	3	+	CONFIG_PARAVIRT=y
	4	+	CONFIG_KVM_GUEST=y
	5	+	CONFIG_IA32_EMULATION=y
	6	+	CONFIG_SERIO=y
	7	+	CONFIG_SERIO_I8042=y
	8	+	CONFIG_ACPI=y
	9	+	CONFIG_X86_MPPARSE=y
	10	+	CONFIG_X86_LOCAL_APIC=y
	11	+	CONFIG_X86_IO_APIC=y

A images/ubuntu-24.04/Dockerfile +43 -0

@@ -0,0 +1,43 @@
	1	+	# SPDX-License-Identifier: MIT
	2	+	#
	3	+	# ermite-runner-ubuntu-24.04: the minimal CI-1 runner image. The same
	4	+	# filesystem is used as an OCI image (container isolation) and exported to an
	5	+	# ext4 base image (vm isolation) by scripts/build-image.sh. It holds the OS
	6	+	# only: the runner executable is attached by the host at start (never baked
	7	+	# in), so a runner upgrade does not need an image rebuild.
	8	+	FROM ubuntu:24.04
	9	+
	10	+	ARG DEBIAN_FRONTEND=noninteractive
	11	+
	12	+	RUN apt-get update \
	13	+	&& apt-get install -y --no-install-recommends \
	14	+	bash build-essential ca-certificates curl e2fsprogs git gnupg iproute2 \
	15	+	iptables jq kmod procps python3 sudo tzdata unzip xz-utils zip \
	16	+	&& rm -rf /var/lib/apt/lists/*
	17	+
	18	+	# Docker Engine from Docker's apt repository (the job gets its own daemon).
	19	+	RUN install -m 0755 -d /etc/apt/keyrings \
	20	+	&& curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc \
	21	+	&& chmod a+r /etc/apt/keyrings/docker.asc \
	22	+	&& echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu noble stable" \
	23	+	> /etc/apt/sources.list.d/docker.list \
	24	+	&& apt-get update \
	25	+	&& apt-get install -y --no-install-recommends \
	26	+	docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin \
	27	+	&& rm -rf /var/lib/apt/lists/*
	28	+
	29	+	# Like GitHub-hosted runners: user "runner" (uid 1001), passwordless sudo,
	30	+	# member of "docker", with the job layout directories.
	31	+	RUN useradd --create-home --uid 1001 --shell /bin/bash runner \
	32	+	&& usermod -aG docker runner \
	33	+	&& echo 'runner ALL=(ALL) NOPASSWD:ALL' > /etc/sudoers.d/runner \
	34	+	&& chmod 0440 /etc/sudoers.d/runner \
	35	+	&& mkdir -p /home/runner/work /opt/hostedtoolcache /opt/ermite \
	36	+	&& chown -R runner:runner /home/runner /opt/hostedtoolcache
	37	+
	38	+	ENV RUNNER_TOOL_CACHE=/opt/hostedtoolcache \
	39	+	LANG=C.UTF-8
	40	+
	41	+	# The runner executable is bind-mounted (container) or provided by the init
	42	+	# disk (vm) here; its init subcommand starts the job's own Docker daemon.
	43	+	ENTRYPOINT ["/opt/ermite/ermite-runner", "init"]

@@ -0,0 +1,43 @@
	1	+	# SPDX-License-Identifier: MIT
	2	+	#
	3	+	# ermite-runner-ubuntu-24.04: the minimal CI-1 runner image. The same
	4	+	# filesystem is used as an OCI image (container isolation) and exported to an
	5	+	# ext4 base image (vm isolation) by scripts/build-image.sh. It holds the OS
	6	+	# only: the runner executable is attached by the host at start (never baked
	7	+	# in), so a runner upgrade does not need an image rebuild.
	8	+	FROM ubuntu:24.04
	9	+
	10	+	ARG DEBIAN_FRONTEND=noninteractive
	11	+
	12	+	RUN apt-get update \
	13	+	&& apt-get install -y --no-install-recommends \
	14	+	bash build-essential ca-certificates curl e2fsprogs git gnupg iproute2 \
	15	+	iptables jq kmod procps python3 sudo tzdata unzip xz-utils zip \
	16	+	&& rm -rf /var/lib/apt/lists/*
	17	+
	18	+	# Docker Engine from Docker's apt repository (the job gets its own daemon).
	19	+	RUN install -m 0755 -d /etc/apt/keyrings \
	20	+	&& curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc \
	21	+	&& chmod a+r /etc/apt/keyrings/docker.asc \
	22	+	&& echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu noble stable" \
	23	+	> /etc/apt/sources.list.d/docker.list \
	24	+	&& apt-get update \
	25	+	&& apt-get install -y --no-install-recommends \
	26	+	docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin \
	27	+	&& rm -rf /var/lib/apt/lists/*
	28	+
	29	+	# Like GitHub-hosted runners: user "runner" (uid 1001), passwordless sudo,
	30	+	# member of "docker", with the job layout directories.
	31	+	RUN useradd --create-home --uid 1001 --shell /bin/bash runner \
	32	+	&& usermod -aG docker runner \
	33	+	&& echo 'runner ALL=(ALL) NOPASSWD:ALL' > /etc/sudoers.d/runner \
	34	+	&& chmod 0440 /etc/sudoers.d/runner \
	35	+	&& mkdir -p /home/runner/work /opt/hostedtoolcache /opt/ermite \
	36	+	&& chown -R runner:runner /home/runner /opt/hostedtoolcache
	37	+
	38	+	ENV RUNNER_TOOL_CACHE=/opt/hostedtoolcache \
	39	+	LANG=C.UTF-8
	40	+
	41	+	# The runner executable is bind-mounted (container) or provided by the init
	42	+	# disk (vm) here; its init subcommand starts the job's own Docker daemon.
	43	+	ENTRYPOINT ["/opt/ermite/ermite-runner", "init"]

A scripts/build-image.sh +56 -0

@@ -0,0 +1,56 @@
	1	+	#!/usr/bin/env bash
	2	+	# SPDX-License-Identifier: MIT
	3	+	#
	4	+	# Build the ermite-runner-ubuntu-24.04 image as an OCI image (container
	5	+	# isolation) and as a sparse ext4 base image (vm isolation). No root needed:
	6	+	# the OCI build uses docker or podman (rootless is fine), the ext4 image is
	7	+	# written by `mkfs.ext4 -d` from the exported rootfs tarball.
	8	+	#
	9	+	# scripts/build-image.sh [OUT_DIR]
	10	+	#
	11	+	# Environment:
	12	+	# ENGINE docker or podman (default: first found)
	13	+	# IMAGE_TAG OCI tag (default ermite-runner-ubuntu-24.04:dev)
	14	+	# EXT4_SLACK free space added to the base image in MiB (default 512)
	15	+	#
	16	+	# Output: OUT_DIR/base.ext4 (read-only shared base disk; its UUID and size are
	17	+	# stable per build) and the OCI image IMAGE_TAG in the engine's store.
	18	+	set -euo pipefail
	19	+
	20	+	root=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
	21	+	out=${1:-$root/tmp/image}
	22	+	tag=${IMAGE_TAG:-ermite-runner-ubuntu-24.04:dev}
	23	+	slack=${EXT4_SLACK:-512}
	24	+	engine=${ENGINE:-}
	25	+
	26	+	if [ -z "$engine" ]; then
	27	+	for e in docker podman; do
	28	+	if command -v "$e" >/dev/null 2>&1; then engine=$e; break; fi
	29	+	done
	30	+	fi
	31	+	[ -n "$engine" ] \|\| { echo "need docker or podman" >&2; exit 1; }
	32	+	command -v mkfs.ext4 >/dev/null \|\| { echo "need mkfs.ext4 (e2fsprogs >= 1.47.1 for tarball input)" >&2; exit 1; }
	33	+
	34	+	mkdir -p "$out"
	35	+	out=$(cd "$out" && pwd)
	36	+	"$engine" build -t "$tag" "$root/images/ubuntu-24.04"
	37	+
	38	+	cid=$("$engine" create "$tag")
	39	+	tmp=$(mktemp -d)
	40	+	cleanup() { "$engine" rm -f "$cid" >/dev/null 2>&1 \|\| true; rm -rf "$tmp"; }
	41	+	trap cleanup EXIT
	42	+
	43	+	"$engine" export "$cid" > "$tmp/rootfs.tar"
	44	+	bytes=$(stat -c %s "$tmp/rootfs.tar")
	45	+	# ext4 metadata overhead is about 5 %; the slack leaves room for the guest's
	46	+	# own writes into the (read-only mounted) base only when someone remounts it.
	47	+	mib=$(( bytes / 1024 / 1024 * 110 / 100 + slack ))
	48	+
	49	+	img="$out/base.ext4.part"
	50	+	rm -f "$img"
	51	+	truncate -s "${mib}M" "$img"
	52	+	# No journal: the base is mounted read-only and shared between VMs.
	53	+	mkfs.ext4 -q -F -L ermite-base -O ^has_journal -E lazy_itable_init=1,nodiscard \
	54	+	-d "$tmp/rootfs.tar" "$img"
	55	+	mv "$img" "$out/base.ext4"
	56	+	echo "base image: $out/base.ext4 (${mib} MiB sparse), OCI image: $tag"

@@ -0,0 +1,56 @@
	1	+	#!/usr/bin/env bash
	2	+	# SPDX-License-Identifier: MIT
	3	+	#
	4	+	# Build the ermite-runner-ubuntu-24.04 image as an OCI image (container
	5	+	# isolation) and as a sparse ext4 base image (vm isolation). No root needed:
	6	+	# the OCI build uses docker or podman (rootless is fine), the ext4 image is
	7	+	# written by `mkfs.ext4 -d` from the exported rootfs tarball.
	8	+	#
	9	+	# scripts/build-image.sh [OUT_DIR]
	10	+	#
	11	+	# Environment:
	12	+	# ENGINE docker or podman (default: first found)
	13	+	# IMAGE_TAG OCI tag (default ermite-runner-ubuntu-24.04:dev)
	14	+	# EXT4_SLACK free space added to the base image in MiB (default 512)
	15	+	#
	16	+	# Output: OUT_DIR/base.ext4 (read-only shared base disk; its UUID and size are
	17	+	# stable per build) and the OCI image IMAGE_TAG in the engine's store.
	18	+	set -euo pipefail
	19	+
	20	+	root=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
	21	+	out=${1:-$root/tmp/image}
	22	+	tag=${IMAGE_TAG:-ermite-runner-ubuntu-24.04:dev}
	23	+	slack=${EXT4_SLACK:-512}
	24	+	engine=${ENGINE:-}
	25	+
	26	+	if [ -z "$engine" ]; then
	27	+	for e in docker podman; do
	28	+	if command -v "$e" >/dev/null 2>&1; then engine=$e; break; fi
	29	+	done
	30	+	fi
	31	+	[ -n "$engine" ] \|\| { echo "need docker or podman" >&2; exit 1; }
	32	+	command -v mkfs.ext4 >/dev/null \|\| { echo "need mkfs.ext4 (e2fsprogs >= 1.47.1 for tarball input)" >&2; exit 1; }
	33	+
	34	+	mkdir -p "$out"
	35	+	out=$(cd "$out" && pwd)
	36	+	"$engine" build -t "$tag" "$root/images/ubuntu-24.04"
	37	+
	38	+	cid=$("$engine" create "$tag")
	39	+	tmp=$(mktemp -d)
	40	+	cleanup() { "$engine" rm -f "$cid" >/dev/null 2>&1 \|\| true; rm -rf "$tmp"; }
	41	+	trap cleanup EXIT
	42	+
	43	+	"$engine" export "$cid" > "$tmp/rootfs.tar"
	44	+	bytes=$(stat -c %s "$tmp/rootfs.tar")
	45	+	# ext4 metadata overhead is about 5 %; the slack leaves room for the guest's
	46	+	# own writes into the (read-only mounted) base only when someone remounts it.
	47	+	mib=$(( bytes / 1024 / 1024 * 110 / 100 + slack ))
	48	+
	49	+	img="$out/base.ext4.part"
	50	+	rm -f "$img"
	51	+	truncate -s "${mib}M" "$img"
	52	+	# No journal: the base is mounted read-only and shared between VMs.
	53	+	mkfs.ext4 -q -F -L ermite-base -O ^has_journal -E lazy_itable_init=1,nodiscard \
	54	+	-d "$tmp/rootfs.tar" "$img"
	55	+	mv "$img" "$out/base.ext4"
	56	+	echo "base image: $out/base.ext4 (${mib} MiB sparse), OCI image: $tag"

A scripts/build-kernel.sh +77 -0

@@ -0,0 +1,77 @@
	1	+	#!/usr/bin/env bash
	2	+	# SPDX-License-Identifier: MIT
	3	+	#
	4	+	# Build the Firecracker guest kernel (Linux 6.18 LTS) from kernel.org.
	5	+	#
	6	+	# scripts/build-kernel.sh [OUT_DIR]
	7	+	#
	8	+	# Environment:
	9	+	# KERNEL_VERSION version to build (default 6.18.56)
	10	+	# ARCH_NAME x86_64 (default: uname -m) or arm64 (aarch64)
	11	+	# WORK_DIR download and build directory (default tmp/kernel, gitignored)
	12	+	# JOBS make parallelism (default: nproc)
	13	+	#
	14	+	# Output: OUT_DIR/vmlinux (x86_64 ELF, accepted by Firecracker) or
	15	+	# OUT_DIR/Image (arm64), plus OUT_DIR/kernel.config. No root needed. The tarball
	16	+	# is verified against the sha256sums.asc published next to it on kernel.org
	17	+	# (integrity over TLS; the PGP signature is not checked, see README).
	18	+	set -euo pipefail
	19	+
	20	+	root=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
	21	+	version=${KERNEL_VERSION:-6.18.56}
	22	+	major=${version%%.*}
	23	+	work=${WORK_DIR:-$root/tmp/kernel}
	24	+	out=${1:-$root/tmp/image}
	25	+	jobs=${JOBS:-$(nproc)}
	26	+	arch_name=${ARCH_NAME:-$(uname -m)}
	27	+
	28	+	case "$arch_name" in
	29	+	x86_64\|amd64) karch=x86; arch_frag=x86_64; target=vmlinux; artifact=vmlinux ;;
	30	+	aarch64\|arm64) karch=arm64; arch_frag=arm64; target=Image; artifact=arch/arm64/boot/Image ;;
	31	+	*) echo "unsupported architecture: $arch_name" >&2; exit 2 ;;
	32	+	esac
	33	+
	34	+	mkdir -p "$work" "$out"
	35	+	work=$(cd "$work" && pwd)
	36	+	out=$(cd "$out" && pwd)
	37	+	tarball="linux-$version.tar.xz"
	38	+	base="https://cdn.kernel.org/pub/linux/kernel/v${major}.x"
	39	+
	40	+	if [ ! -f "$work/$tarball" ]; then
	41	+	curl -fsSL -o "$work/$tarball.part" "$base/$tarball"
	42	+	mv "$work/$tarball.part" "$work/$tarball"
	43	+	fi
	44	+	if [ ! -f "$work/sha256sums.asc" ] \|\| ! grep -q " $tarball\$" "$work/sha256sums.asc"; then
	45	+	curl -fsSL -o "$work/sha256sums.asc" "$base/sha256sums.asc"
	46	+	fi
	47	+	want=$(grep " $tarball\$" "$work/sha256sums.asc" \| awk '{print $1}' \| head -n1)
	48	+	have=$(sha256sum "$work/$tarball" \| awk '{print $1}')
	49	+	if [ -z "$want" ] \|\| [ "$want" != "$have" ]; then
	50	+	echo "checksum mismatch for $tarball (want '$want', have '$have')" >&2
	51	+	exit 1
	52	+	fi
	53	+
	54	+	src="$work/linux-$version"
	55	+	[ -d "$src" ] \|\| tar -C "$work" -xf "$work/$tarball"
	56	+
	57	+	cd "$src"
	58	+	export ARCH=$karch
	59	+	make tinyconfig >/dev/null
	60	+	scripts/kconfig/merge_config.sh -m .config \
	61	+	"$root/images/kernel/config-6.18" "$root/images/kernel/config-6.18.$arch_frag" >/dev/null
	62	+	make olddefconfig >/dev/null
	63	+
	64	+	# Fail if an option of the fragments was dropped by a missing dependency.
	65	+	missing=0
	66	+	while IFS== read -r key val; do
	67	+	if grep -q "^$key=$val\$" .config; then continue; fi
	68	+	if [ "$val" = n ] && ! grep -q "^$key=" .config; then continue; fi
	69	+	echo "kernel option not applied: $key=$val" >&2
	70	+	missing=1
	71	+	done < <(cat "$root/images/kernel/config-6.18" "$root/images/kernel/config-6.18.$arch_frag" \| grep -E '^CONFIG_[A-Z0-9_]+=')
	72	+	[ "$missing" = 0 ] \|\| exit 1
	73	+
	74	+	make -j"$jobs" "$target"
	75	+	cp "$artifact" "$out/$(basename "$artifact")"
	76	+	cp .config "$out/kernel.config"
	77	+	echo "kernel: $out/$(basename "$artifact")"

@@ -0,0 +1,77 @@
	1	+	#!/usr/bin/env bash
	2	+	# SPDX-License-Identifier: MIT
	3	+	#
	4	+	# Build the Firecracker guest kernel (Linux 6.18 LTS) from kernel.org.
	5	+	#
	6	+	# scripts/build-kernel.sh [OUT_DIR]
	7	+	#
	8	+	# Environment:
	9	+	# KERNEL_VERSION version to build (default 6.18.56)
	10	+	# ARCH_NAME x86_64 (default: uname -m) or arm64 (aarch64)
	11	+	# WORK_DIR download and build directory (default tmp/kernel, gitignored)
	12	+	# JOBS make parallelism (default: nproc)
	13	+	#
	14	+	# Output: OUT_DIR/vmlinux (x86_64 ELF, accepted by Firecracker) or
	15	+	# OUT_DIR/Image (arm64), plus OUT_DIR/kernel.config. No root needed. The tarball
	16	+	# is verified against the sha256sums.asc published next to it on kernel.org
	17	+	# (integrity over TLS; the PGP signature is not checked, see README).
	18	+	set -euo pipefail
	19	+
	20	+	root=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
	21	+	version=${KERNEL_VERSION:-6.18.56}
	22	+	major=${version%%.*}
	23	+	work=${WORK_DIR:-$root/tmp/kernel}
	24	+	out=${1:-$root/tmp/image}
	25	+	jobs=${JOBS:-$(nproc)}
	26	+	arch_name=${ARCH_NAME:-$(uname -m)}
	27	+
	28	+	case "$arch_name" in
	29	+	x86_64\|amd64) karch=x86; arch_frag=x86_64; target=vmlinux; artifact=vmlinux ;;
	30	+	aarch64\|arm64) karch=arm64; arch_frag=arm64; target=Image; artifact=arch/arm64/boot/Image ;;
	31	+	*) echo "unsupported architecture: $arch_name" >&2; exit 2 ;;
	32	+	esac
	33	+
	34	+	mkdir -p "$work" "$out"
	35	+	work=$(cd "$work" && pwd)
	36	+	out=$(cd "$out" && pwd)
	37	+	tarball="linux-$version.tar.xz"
	38	+	base="https://cdn.kernel.org/pub/linux/kernel/v${major}.x"
	39	+
	40	+	if [ ! -f "$work/$tarball" ]; then
	41	+	curl -fsSL -o "$work/$tarball.part" "$base/$tarball"
	42	+	mv "$work/$tarball.part" "$work/$tarball"
	43	+	fi
	44	+	if [ ! -f "$work/sha256sums.asc" ] \|\| ! grep -q " $tarball\$" "$work/sha256sums.asc"; then
	45	+	curl -fsSL -o "$work/sha256sums.asc" "$base/sha256sums.asc"
	46	+	fi
	47	+	want=$(grep " $tarball\$" "$work/sha256sums.asc" \| awk '{print $1}' \| head -n1)
	48	+	have=$(sha256sum "$work/$tarball" \| awk '{print $1}')
	49	+	if [ -z "$want" ] \|\| [ "$want" != "$have" ]; then
	50	+	echo "checksum mismatch for $tarball (want '$want', have '$have')" >&2
	51	+	exit 1
	52	+	fi
	53	+
	54	+	src="$work/linux-$version"
	55	+	[ -d "$src" ] \|\| tar -C "$work" -xf "$work/$tarball"
	56	+
	57	+	cd "$src"
	58	+	export ARCH=$karch
	59	+	make tinyconfig >/dev/null
	60	+	scripts/kconfig/merge_config.sh -m .config \
	61	+	"$root/images/kernel/config-6.18" "$root/images/kernel/config-6.18.$arch_frag" >/dev/null
	62	+	make olddefconfig >/dev/null
	63	+
	64	+	# Fail if an option of the fragments was dropped by a missing dependency.
	65	+	missing=0
	66	+	while IFS== read -r key val; do
	67	+	if grep -q "^$key=$val\$" .config; then continue; fi
	68	+	if [ "$val" = n ] && ! grep -q "^$key=" .config; then continue; fi
	69	+	echo "kernel option not applied: $key=$val" >&2
	70	+	missing=1
	71	+	done < <(cat "$root/images/kernel/config-6.18" "$root/images/kernel/config-6.18.$arch_frag" \| grep -E '^CONFIG_[A-Z0-9_]+=')
	72	+	[ "$missing" = 0 ] \|\| exit 1
	73	+
	74	+	make -j"$jobs" "$target"
	75	+	cp "$artifact" "$out/$(basename "$artifact")"
	76	+	cp .config "$out/kernel.config"
	77	+	echo "kernel: $out/$(basename "$artifact")"