actions: Add mmdebstrap action

Add mmdebstrap [1] as a faster and more flexible alternative to debootstrap.

[1] https://gitlab.mister-muffin.de/josch/mmdebstrap

Signed-off-by: Nicolai Buchwitz <[email protected]>

.github/workflows/ci.yaml

@@ -128,6 +128,7 @@ jobs:
           - { name: "partitioning", case: "partitioning" }
           - { name: "msdos partitioning", case: "msdos" }
           - { name: "debian (amd64)", case: "debian", variables: "-t architecture:amd64" }
+          - { name: "debian with mmdebstrap (amd64)", case: "debian", variables: "-t architecture:amd64 -t tool:mmdebstrap" }
         exclude:
           - backend: nofakemachine
             test: { name: "partitioning", case: "partitioning" }

actions/mmdebstrap_action.go

@@ -0,0 +1,186 @@
+/*
+mmdebstrap Action
+
+Construct the target rootfs with mmdebstrap tool.
+
+Please keep in mind -- file `/etc/resolv.conf` will be removed after execution.
+Most of the OS scripts used by `mmdebstrap` copy `resolv.conf` from the host,
+and this may lead to incorrect configuration when becoming part of the created rootfs.
+
+ # Yaml syntax:
+ - action: mmdebstrap
+   mirrors: <list of URLs>
+   suite: "name"
+   components: <list of components>
+   variant: "name"
+   keyring-packages:
+   keyring-files:
+
+Mandatory properties:
+
+- suite -- release code name or symbolic name (e.g. "stable")
+
+Optional properties:
+
+- mirrors -- list of URLs with Debian-compatible repository
+ If no mirror is specified debos will use http://deb.debian.org/debian as default.
+
+- variant -- name of the bootstrap script variant to use
+
+- components -- list of components to use for packages selection.
+ If no components are specified debos will use main as default.
+
+Example:
+ components: [ main, contrib ]
+
+- keyring-packages -- list of keyrings for package validation.
+
+- keyring-files -- list keyring files for repository validation.
+
+- merged-usr -- use merged '/usr' filesystem, true by default.
+
+*/
+package actions
+
+import (
+	"fmt"
+	"os"
+	"path"
+	"strings"
+	"runtime"
+
+	"github.com/go-debos/debos"
+	"github.com/go-debos/fakemachine"
+)
+
+type MmdebstrapAction struct {
+	debos.BaseAction `yaml:",inline"`
+	Suite            string
+	Mirrors          []string
+	Variant          string
+	KeyringPackages  []string `yaml:"keyring-packages"`
+	KeyringFiles     []string `yaml:"keyring-files"`
+	Components       []string
+	MergedUsr        *bool `yaml:"merged-usr"`
+}
+
+func NewMmdebstrapAction() *MmdebstrapAction {
+	d := MmdebstrapAction{}
+	// Be secure by default
+	// Use main as default component
+	d.Components = []string{"main"}
+
+	return &d
+}
+
+func (d *MmdebstrapAction) listOptionFiles(context *debos.DebosContext) []string {
+	files := []string{}
+
+	if d.KeyringFiles != nil {
+		for _, file := range d.KeyringFiles {
+			file = debos.CleanPathAt(file, context.RecipeDir)
+			files = append(files, file)
+		}
+	}
+
+	return files
+}
+
+func (d *MmdebstrapAction) Verify(context *debos.DebosContext) error {
+	if len(d.Suite) == 0 {
+		return fmt.Errorf("suite property not specified")
+	}
+
+	files := d.listOptionFiles(context)
+
+	// Check if all needed files exists
+	for _, f := range files {
+		if _, err := os.Stat(f); os.IsNotExist(err) {
+			return err
+		}
+	}
+	return nil
+}
+
+func (d *MmdebstrapAction) PreMachine(context *debos.DebosContext, m *fakemachine.Machine, args *[]string) error {
+
+	mounts := d.listOptionFiles(context)
+
+	// Mount configuration files outside of recipes directory
+	for _, mount := range mounts {
+		m.AddVolume(path.Dir(mount))
+	}
+
+	return nil
+}
+
+func (d *MmdebstrapAction) Run(context *debos.DebosContext) error {
+	cmdline := []string{"mmdebstrap"}
+
+	if d.MergedUsr != nil {
+		if *d.MergedUsr {
+			cmdline = append(cmdline, "--include=usrmerge")
+		} else {
+			cmdline = append(cmdline, "--hook-dir=/usr/share/mmdebstrap/hooks/no-merged-usr")
+		}
+	}
+
+	if d.KeyringFiles != nil {
+		s := strings.Join(d.KeyringFiles, ",")
+		cmdline = append(cmdline, fmt.Sprintf("--keyring=%s", s))
+	}
+
+	if d.KeyringPackages != nil {
+		s := strings.Join(d.KeyringPackages, ",")
+		cmdline = append(cmdline, fmt.Sprintf("--include=%s", s))
+	}
+
+	if d.Components != nil {
+		s := strings.Join(d.Components, ",")
+		cmdline = append(cmdline, fmt.Sprintf("--components=%s", s))
+	}
+
+	/* Only works for amd64, arm64 and riscv64 hosts, which should be enough */
+	foreign := context.Architecture != runtime.GOARCH
+
+	if foreign {
+		cmdline = append(cmdline, fmt.Sprintf("--architectures=%s", context.Architecture))
+
+	}
+
+	if d.Variant != "" {
+		cmdline = append(cmdline, fmt.Sprintf("--variant=%s", d.Variant))
+	}
+
+	cmdline = append(cmdline, d.Suite)
+	cmdline = append(cmdline, context.Rootdir)
+
+	if d.Mirrors != nil {
+		cmdline = append(cmdline, d.Mirrors...)
+	}
+
+	/* Make sure files in /etc/apt/ exist inside the fakemachine otherwise
+	   mmdebstrap prints a warning about the path not existing. */
+	if fakemachine.InMachine() {
+		if err := os.MkdirAll(path.Join("/etc/apt/apt.conf.d"), os.ModePerm); err != nil {
+			return err
+		}
+		if err := os.MkdirAll(path.Join("/etc/apt/trusted.gpg.d"), os.ModePerm); err != nil {
+			return err
+		}
+	}
+
+	err := debos.Command{}.Run("Mmdebstrap", cmdline...)
+
+	/* Cleanup resolv.conf after mmdebstrap */
+	resolvconf := path.Join(context.Rootdir, "/etc/resolv.conf")
+	if _, err = os.Stat(resolvconf); !os.IsNotExist(err) {
+		if err = os.Remove(resolvconf); err != nil {
+			return err
+		}
+	}
+
+	c := debos.NewChrootCommandForContext(*context)
+
+	return c.Run("apt clean", "/usr/bin/apt-get", "clean")
+}

actions/recipe.go

@@ -49,6 +49,8 @@ Supported actions
 
 - debootstrap -- https://godoc.org/github.com/go-debos/debos/actions#hdr-Debootstrap_Action
 
+- mmdebstrap -- https://godoc.org/github.com/go-debos/debos/actions#hdr-Mmdebstrap_Action
+
 - download -- https://godoc.org/github.com/go-debos/debos/actions#hdr-Download_Action
 
 - filesystem-deploy -- https://godoc.org/github.com/go-debos/debos/actions#hdr-FilesystemDeploy_Action
@@ -115,6 +117,8 @@ func (y *YamlAction) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	switch aux.Action {
 	case "debootstrap":
 		y.Action = NewDebootstrapAction()
+	case "mmdebstrap":
+		y.Action = NewMmdebstrapAction()
 	case "pacstrap":
 		y.Action = &PacstrapAction{}
 	case "pack":

docker/Dockerfile

@@ -68,6 +68,7 @@ RUN apt-get update && \
         ca-certificates \
         debian-ports-archive-keyring \
         debootstrap \
+        mmdebstrap \
         dosfstools \
         e2fsprogs \
         equivs \

tests/debian/test.yaml

@@ -1,9 +1,10 @@
 ---
 {{- $architecture := or .architecture "amd64"}}
+{{- $tool := or .tool "debootstrap" }}
 architecture: {{$architecture}}
 
 actions:
-  - action: debootstrap
+  - action: {{ $tool }}
     suite: bullseye
     variant: minbase
     merged-usr: true