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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2020 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package boot
import (
"path/filepath"
"github.com/snapcore/snapd/dirs"
"github.com/snapcore/snapd/gadget"
)
var (
// InitramfsRunMntDir is the directory where ubuntu partitions are mounted
// during the initramfs.
InitramfsRunMntDir string
// InitramfsDataDir is the location of system-data role partition
// (typically a partition labeled "ubuntu-data") during the initramfs.
InitramfsDataDir string
// InitramfsHostUbuntuDataDir is the location of the host ubuntu-data
// during the initramfs, typically used in recover mode.
InitramfsHostUbuntuDataDir string
// InitramfsUbuntuBootDir is the location of ubuntu-boot during the
// initramfs.
InitramfsUbuntuBootDir string
// InitramfsUbuntuSeedDir is the location of ubuntu-seed during the
// initramfs.
InitramfsUbuntuSeedDir string
// InitramfsUbuntuSaveDir is the location of ubuntu-save during the
// initramfs.
InitramfsUbuntuSaveDir string
// InstallHostFDESaveDir is the directory of the FDE data on the
// ubuntu-save partition during install mode. For other modes,
// use dirs.SnapSaveFDEDirUnder().
InstallHostFDESaveDir string
// InstallHostSaveDir is the directory of device data on ubuntu-save during
// install mode. For other modes use dirs.SnapDeviceSaveDir
InstallHostDeviceSaveDir string
// InitramfsSeedEncryptionKeyDir is the location of the encrypted partition
// keys during the initramfs on ubuntu-seed.
InitramfsSeedEncryptionKeyDir string
// InitramfsBootEncryptionKeyDir is the location of the encrypted partition
// keys during the initramfs on ubuntu-boot.
InitramfsBootEncryptionKeyDir string
// InstallUbuntuDataDir is the location of the data partition during
// install mode. This should always be on a physical partition.
InstallUbuntuDataDir string
// snapBootFlagsFile is the location of the file that is used
// internally for saving the current boot flags active for this boot.
snapBootFlagsFile string
)
// InstallHostWritableDir is the location of the writable partition of the
// installed host during install mode. This should always be on a physical
// partition.
func InstallHostWritableDir(mod gadget.Model) string {
if mod.Classic() {
return InstallUbuntuDataDir
}
return filepath.Join(InstallUbuntuDataDir, "system-data")
}
// InitramfsHostWritableDir is the location of the host writable
// partition during the initramfs, typically used in recover mode.
func InitramfsHostWritableDir(mod gadget.Model) string {
if mod.Classic() {
return InitramfsHostUbuntuDataDir
}
return filepath.Join(InitramfsHostUbuntuDataDir, "system-data")
}
// InitramfsWritableDir is the location of the writable partition during the
// initramfs. Note that this may refer to a temporary filesystem or a
// physical partition depending on what system mode the system is in.
//
// This needs the "isRunMode" in the future for when we implement a
// recovery system on "classic+modes". In this scenario in "run" mode
// we have the debian based rootfs in /run/mnt/ubuntu-data *but* in
// "recover" mode the rootfs comes from a base snap like "core22" so
// we need to generate "ubuntu-core" like paths.
func InitramfsWritableDir(mod gadget.Model, isRunMode bool) string {
if mod.Classic() && isRunMode {
return InitramfsDataDir
}
return filepath.Join(InitramfsDataDir, "system-data")
}
// InstallHostFDEDataDir is the location of the FDE data during install mode.
func InstallHostFDEDataDir(mod gadget.Model) string {
return dirs.SnapFDEDirUnder(InstallHostWritableDir(mod))
}
func setInitramfsDirVars(rootdir string) {
InitramfsRunMntDir = filepath.Join(rootdir, "run/mnt")
InitramfsDataDir = filepath.Join(InitramfsRunMntDir, "data")
InitramfsHostUbuntuDataDir = filepath.Join(InitramfsRunMntDir, "host", "ubuntu-data")
InitramfsUbuntuBootDir = filepath.Join(InitramfsRunMntDir, "ubuntu-boot")
InitramfsUbuntuSeedDir = filepath.Join(InitramfsRunMntDir, "ubuntu-seed")
InitramfsUbuntuSaveDir = filepath.Join(InitramfsRunMntDir, "ubuntu-save")
InstallHostDeviceSaveDir = filepath.Join(InitramfsUbuntuSaveDir, "device")
InstallHostFDESaveDir = filepath.Join(InstallHostDeviceSaveDir, "fde")
InitramfsSeedEncryptionKeyDir = filepath.Join(InitramfsUbuntuSeedDir, "device/fde")
InitramfsBootEncryptionKeyDir = filepath.Join(InitramfsUbuntuBootDir, "device/fde")
InstallUbuntuDataDir = filepath.Join(InitramfsRunMntDir, "ubuntu-data")
snapBootFlagsFile = filepath.Join(dirs.SnapRunDir, "boot-flags")
}
func init() {
setInitramfsDirVars(dirs.GlobalRootDir)
// register to change the values of Initramfs* dir values when the global
// root dir changes
dirs.AddRootDirCallback(setInitramfsDirVars)
}
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