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Refactor VM lifecycle around capabilities

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Make host-integrated VM features fit a standard Go extension path instead of adding more one-off branches through vm.go. This is the enabling refactor for future work like shared mounts, not the /work feature itself.

Add a daemon capability pipeline plus a structured guest-config builder, then move the existing /root work-disk mount, built-in DNS, and NAT wiring onto those hooks. Generalize Firecracker drive config at the same time so later storage features can extend machine setup without another hardcoded path.

Add banger doctor on top of the shared readiness checks, update the docs to describe the new architecture, and cover the new seams with guest-config, capability, report, CLI, and full go test verification. Also verify make build and a real ./banger doctor run on the host.
This commit is contained in:
Thales Maciel 2026-03-18 19:28:26 -03:00
parent 9e98445fa2
commit 4930d82cb9
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GPG key ID: 33112E6833C34679
18 changed files with 1120 additions and 105 deletions
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95
internal/daemon/preflight.go
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@ -11,56 +11,14 @@ import (
func (d *Daemon) validateStartPrereqs(ctx context.Context, vm model.VMRecord, image model.Image) error {
checks := system.NewPreflight()
hint := paths.RuntimeBundleHint()
for _, command := range []string{"sudo", "ip", "dmsetup", "losetup", "blockdev", "truncate", "pgrep", "chown", "chmod", "kill", "e2cp", "e2rm", "debugfs"} {
checks.RequireCommand(command, toolHint(command))
}
checks.RequireExecutable(d.config.FirecrackerBin, "firecracker binary", hint)
checks.RequireFile(image.RootfsPath, "rootfs image", "select a valid image or rebuild the runtime bundle")
checks.RequireFile(image.KernelPath, "kernel image", `set "default_kernel" or refresh the runtime bundle`)
if strings.TrimSpace(image.InitrdPath) != "" {
checks.RequireFile(image.InitrdPath, "initrd image", `set "default_initrd" or refresh the runtime bundle`)
}
if !exists(vm.Runtime.WorkDiskPath) {
for _, command := range []string{"mkfs.ext4", "mount", "umount", "cp"} {
checks.RequireCommand(command, toolHint(command))
}
}
if vm.Spec.NATEnabled {
d.addNATPrereqs(ctx, checks)
}
d.addBaseStartPrereqs(checks, image)
d.addCapabilityStartPrereqs(ctx, checks, vm, image)
return checks.Err("vm start preflight failed")
}
func (d *Daemon) validateImageBuildPrereqs(ctx context.Context, baseRootfs, kernelPath, initrdPath, modulesDir, sizeSpec string) error {
checks := system.NewPreflight()
hint := paths.RuntimeBundleHint()
for _, command := range []string{"sudo", "ip", "pgrep", "chown", "chmod", "kill"} {
checks.RequireCommand(command, toolHint(command))
}
checks.RequireExecutable(d.config.FirecrackerBin, "firecracker binary", hint)
checks.RequireFile(d.config.SSHKeyPath, "ssh private key", `set "ssh_key_path" or refresh the runtime bundle`)
checks.RequireFile(baseRootfs, "base rootfs image", `pass --base-rootfs or set "default_base_rootfs"`)
checks.RequireFile(kernelPath, "kernel image", `pass --kernel or set "default_kernel"`)
checks.RequireFile(d.config.DefaultPackagesFile, "package manifest", `set "default_packages_file" or refresh the runtime bundle`)
if strings.TrimSpace(initrdPath) != "" {
checks.RequireFile(initrdPath, "initrd image", `pass --initrd or set "default_initrd"`)
}
if strings.TrimSpace(modulesDir) != "" {
checks.RequireDir(modulesDir, "modules directory", `pass --modules or set "default_modules_dir"`)
}
if strings.TrimSpace(d.config.DefaultPackagesFile) != "" {
if _, err := system.ReadNormalizedLines(d.config.DefaultPackagesFile); err != nil {
checks.Addf("package manifest at %s is invalid: %v", d.config.DefaultPackagesFile, err)
}
}
if strings.TrimSpace(sizeSpec) != "" {
checks.RequireCommand("e2fsck", toolHint("e2fsck"))
checks.RequireCommand("resize2fs", toolHint("resize2fs"))
}
d.addNATPrereqs(ctx, checks)
d.addImageBuildPrereqs(ctx, checks, baseRootfs, kernelPath, initrdPath, modulesDir, sizeSpec)
return checks.Err("image build preflight failed")
}
@ -89,6 +47,53 @@ func (d *Daemon) addNATPrereqs(ctx context.Context, checks *system.Preflight) {
}
}
func (d *Daemon) addBaseStartPrereqs(checks *system.Preflight, image model.Image) {
hint := paths.RuntimeBundleHint()
d.addBaseStartCommandPrereqs(checks)
checks.RequireExecutable(d.config.FirecrackerBin, "firecracker binary", hint)
checks.RequireFile(image.RootfsPath, "rootfs image", "select a valid image or rebuild the runtime bundle")
checks.RequireFile(image.KernelPath, "kernel image", `set "default_kernel" or refresh the runtime bundle`)
if strings.TrimSpace(image.InitrdPath) != "" {
checks.RequireFile(image.InitrdPath, "initrd image", `set "default_initrd" or refresh the runtime bundle`)
}
}
func (d *Daemon) addBaseStartCommandPrereqs(checks *system.Preflight) {
for _, command := range []string{"sudo", "ip", "dmsetup", "losetup", "blockdev", "truncate", "pgrep", "chown", "chmod", "kill", "e2cp", "e2rm", "debugfs"} {
checks.RequireCommand(command, toolHint(command))
}
}
func (d *Daemon) addImageBuildPrereqs(ctx context.Context, checks *system.Preflight, baseRootfs, kernelPath, initrdPath, modulesDir, sizeSpec string) {
hint := paths.RuntimeBundleHint()
for _, command := range []string{"sudo", "ip", "pgrep", "chown", "chmod", "kill"} {
checks.RequireCommand(command, toolHint(command))
}
checks.RequireExecutable(d.config.FirecrackerBin, "firecracker binary", hint)
checks.RequireFile(d.config.SSHKeyPath, "ssh private key", `set "ssh_key_path" or refresh the runtime bundle`)
checks.RequireFile(baseRootfs, "base rootfs image", `pass --base-rootfs or set "default_base_rootfs"`)
checks.RequireFile(kernelPath, "kernel image", `pass --kernel or set "default_kernel"`)
checks.RequireFile(d.config.DefaultPackagesFile, "package manifest", `set "default_packages_file" or refresh the runtime bundle`)
if strings.TrimSpace(initrdPath) != "" {
checks.RequireFile(initrdPath, "initrd image", `pass --initrd or set "default_initrd"`)
}
if strings.TrimSpace(modulesDir) != "" {
checks.RequireDir(modulesDir, "modules directory", `pass --modules or set "default_modules_dir"`)
}
if strings.TrimSpace(d.config.DefaultPackagesFile) != "" {
if _, err := system.ReadNormalizedLines(d.config.DefaultPackagesFile); err != nil {
checks.Addf("package manifest at %s is invalid: %v", d.config.DefaultPackagesFile, err)
}
}
if strings.TrimSpace(sizeSpec) != "" {
checks.RequireCommand("e2fsck", toolHint("e2fsck"))
checks.RequireCommand("resize2fs", toolHint("resize2fs"))
}
d.addNATPrereqs(ctx, checks)
}
func toolHint(command string) string {
switch command {
case "ip":