Allow creating dirs in rootfs via cc (#109)

pkg/action/common.go

@@ -18,7 +18,10 @@ package action
 
 import (
 	config "github.com/kairos-io/kairos-agent/v2/pkg/config"
+	cnst "github.com/kairos-io/kairos-agent/v2/pkg/constants"
 	"github.com/kairos-io/kairos-agent/v2/pkg/utils"
+	fsutils "github.com/kairos-io/kairos-agent/v2/pkg/utils/fs"
+	"path/filepath"
 )
 
 // Hook is RunStage wrapper that only adds logic to ignore errors
@@ -39,3 +42,15 @@ func ChrootHook(config *config.Config, hook string, chrootDir string, bindMounts
 	}
 	return utils.ChrootedCallback(config, chrootDir, bindMounts, callback)
 }
+
+func createExtraDirsInRootfs(cfg *config.Config, extradirs []string, target string) {
+	for _, d := range extradirs {
+		if exists, _ := fsutils.Exists(cfg.Fs, filepath.Join(target, d)); !exists {
+			cfg.Logger.Debugf("Creating extra dir %s under %s", d, target)
+			err := cfg.Fs.Mkdir(filepath.Join(target, d), cnst.DirPerm)
+			if err != nil {
+				cfg.Logger.Warnf("Failure creating extra dir %s in rootfs at %s", d, target)
+			}
+		}
+	}
+}

pkg/action/install.go

@@ -177,6 +177,9 @@ func (i InstallAction) Run() (err error) {
 	}
 	cleanup.Push(func() error { return e.UnmountImage(&i.spec.Active) })
 
+	// Create extra dirs in rootfs as afterwards this will be impossible due to RO system
+	createExtraDirsInRootfs(i.cfg, i.spec.ExtraDirsRootfs, i.spec.Active.MountPoint)
+
 	// Copy cloud-init if any
 	err = e.CopyCloudConfig(i.spec.CloudInit)
 	if err != nil {

pkg/action/reset.go

@@ -168,6 +168,9 @@ func (r ResetAction) Run() (err error) {
 	}
 	cleanup.Push(func() error { return e.UnmountImage(&r.spec.Active) })
 
+	// Create extra dirs in rootfs as afterwards this will be impossible due to RO system
+	createExtraDirsInRootfs(r.cfg, r.spec.ExtraDirsRootfs, r.spec.Active.MountPoint)
+
 	// install grub
 	grub := utils.NewGrub(r.cfg)
 	err = grub.Install(

pkg/action/upgrade.go

@@ -181,6 +181,9 @@ func (u *UpgradeAction) Run() (err error) {
 	}
 	cleanup.Push(func() error { return e.UnmountImage(&upgradeImg) })
 
+	// Create extra dirs in rootfs as afterwards this will be impossible due to RO system
+	createExtraDirsInRootfs(u.config, u.spec.ExtraDirsRootfs, upgradeImg.MountPoint)
+
 	// Selinux relabel
 	// Doesn't make sense to relabel a readonly filesystem
 	if upgradeImg.FS != constants.SquashFs {

pkg/types/v1/config.go

@@ -56,6 +56,7 @@ type InstallSpec struct {
 	Tty             string              `yaml:"tty,omitempty" mapstructure:"tty"`
 	Reboot          bool                `yaml:"reboot,omitempty" mapstructure:"reboot"`
 	PowerOff        bool                `yaml:"poweroff,omitempty" mapstructure:"poweroff"`
+	ExtraDirsRootfs []string            `yaml:"extra-dirs-rootfs,omitempty" mapstructure:"extra-dirs-rootfs"`
 	Active          Image               `yaml:"system,omitempty" mapstructure:"system"`
 	Recovery        Image               `yaml:"recovery-system,omitempty" mapstructure:"recovery-system"`
 	Passive         Image
@@ -109,9 +110,9 @@ type ResetSpec struct {
 	FormatOEM        bool     `yaml:"reset-oem,omitempty" mapstructure:"reset-oem"`
 	Reboot           bool     `yaml:"reboot,omitempty" mapstructure:"reboot"`
 	PowerOff         bool     `yaml:"poweroff,omitempty" mapstructure:"poweroff"`
-
 	GrubDefEntry     string   `yaml:"grub-entry-name,omitempty" mapstructure:"grub-entry-name"`
 	Tty              string   `yaml:"tty,omitempty" mapstructure:"tty"`
+	ExtraDirsRootfs  []string `yaml:"extra-dirs-rootfs,omitempty" mapstructure:"extra-dirs-rootfs"`
 	Active           Image    `yaml:"system,omitempty" mapstructure:"system"`
 	Passive          Image
 	Partitions       ElementalPartitions
@@ -143,6 +144,7 @@ type UpgradeSpec struct {
 	GrubDefEntry    string   `yaml:"grub-entry-name,omitempty" mapstructure:"grub-entry-name"`
 	Reboot          bool     `yaml:"reboot,omitempty" mapstructure:"reboot"`
 	PowerOff        bool     `yaml:"poweroff,omitempty" mapstructure:"poweroff"`
+	ExtraDirsRootfs []string `yaml:"extra-dirs-rootfs,omitempty" mapstructure:"extra-dirs-rootfs"`
 	Passive         Image
 	Partitions      ElementalPartitions
 	State           *InstallState