[Buildroot] [git commit] fs/cpio: new option to use dracut tool
Yann E. MORIN
yann.morin.1998 at free.fr
Sun Sep 11 08:48:40 UTC 2022
commit: https://git.buildroot.net/buildroot/commit/?id=d8f0ec7a468c30d401b2e51e4bbfe985997f8e0c
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master
Adds an option to invoke the dracut host tool, providing
a configuration file, instead of having a full cpio archive
of the whole target directory.
A default configuration file is provided. It assumes busybox init.
ideally, a different default should be used in case of systemd init, but
that's left for future work.
Signed-off-by: Thierry Bultel <thierry.bultel at linatsea.fr>
[arnout at mind.be: many changes]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be>
[yann.morin.1998 at free.fr: some additional fixups]
Signed-off-by: Yann E. MORIN <yann.morin.1998 at free.fr>
---
fs/cpio/Config.in | 35 ++++++++++++++++++++
fs/cpio/cpio.mk | 33 +++++++++++++++++++
fs/cpio/dracut.conf | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 160 insertions(+)
diff --git a/fs/cpio/Config.in b/fs/cpio/Config.in
index c1151a2881..861e9a929e 100644
--- a/fs/cpio/Config.in
+++ b/fs/cpio/Config.in
@@ -7,6 +7,41 @@ config BR2_TARGET_ROOTFS_CPIO
if BR2_TARGET_ROOTFS_CPIO
+choice
+ prompt "cpio type"
+ default BR2_TARGET_ROOTFS_CPIO_FULL
+
+config BR2_TARGET_ROOTFS_CPIO_FULL
+ bool "cpio the whole root filesystem"
+ help
+ Build a cpio archive containing the whole the root filesystem.
+
+config BR2_TARGET_ROOTFS_CPIO_DRACUT
+ bool "Invoke dracut to make a partial initramfs"
+ select BR2_PACKAGE_HOST_DRACUT
+ help
+ Build an additional initramfs using dracut. This only contains
+ a subset of the rootfs, as determined by the configuration
+ file.
+ This can be useful to create a recovery system, for instance.
+
+endchoice
+
+if BR2_TARGET_ROOTFS_CPIO_DRACUT
+
+config BR2_TARGET_ROOTFS_CPIO_DRACUT_CONF_FILE
+ string "dracut configuration file"
+ default "fs/cpio/dracut.conf"
+ help
+ Dracut configuration file. It determines which parts of the
+ rootfs get included in the cpio image. See dracut.conf(5) or
+ https://github.com/dracutdevs/dracut/blob/master/man/dracut.conf.5.asc
+
+ The default configuration file is suitable for busybox init.
+ It doesn't, however, pivot_root into a full rootfs.
+
+endif
+
choice
prompt "Compression method"
default BR2_TARGET_ROOTFS_CPIO_NONE
diff --git a/fs/cpio/cpio.mk b/fs/cpio/cpio.mk
index 81f8c393d1..fa66b1c710 100644
--- a/fs/cpio/cpio.mk
+++ b/fs/cpio/cpio.mk
@@ -36,6 +36,8 @@ ROOTFS_CPIO_DEPENDENCIES += host-cpio
ROOTFS_CPIO_OPTS += --reproducible
endif
+ifeq ($(BR2_TARGET_ROOTFS_CPIO_FULL),y)
+
define ROOTFS_CPIO_CMD
cd $(TARGET_DIR) && \
find . \
@@ -44,6 +46,37 @@ define ROOTFS_CPIO_CMD
> $@
endef
+else ifeq ($(BR2_TARGET_ROOTFS_CPIO_DRACUT),y)
+
+ROOTFS_CPIO_DEPENDENCIES += host-dracut
+
+ROOTFS_CPIO_DRACUT_CONF_FILE = $(call qstrip,$(BR2_TARGET_ROOTFS_CPIO_DRACUT_CONF_FILE))
+ifeq ($(BR_BUILDING):$(ROOTFS_CPIO_DRACUT_CONF_FILE),y:)
+$(error No dracut config file name specified, check your BR2_TARGET_ROOTFS_CPIO_DRACUT_CONF_FILE setting)
+endif
+
+ifeq ($(BR2_LINUX_KERNEL),y)
+ROOTFS_CPIO_DEPENDENCIES += linux
+ROOTFS_CPIO_OPTS += --kver $(LINUX_VERSION_PROBED)
+else
+ROOTFS_CPIO_OPTS += --no-kernel
+endif
+
+define ROOTFS_CPIO_CMD
+ mkdir -p $(ROOTFS_CPIO_DIR)/tmp
+ $(HOST_DIR)/bin/dracut \
+ $(ROOTFS_CPIO_OPTS) \
+ -c $(ROOTFS_CPIO_DRACUT_CONF_FILE) \
+ --sysroot $(TARGET_DIR) \
+ --tmpdir $(ROOTFS_CPIO_DIR)/tmp \
+ -M \
+ --force \
+ --no-compress \
+ $@
+endef
+
+endif #BR2_TARGET_ROOTFS_CPIO_DRACUT
+
ifeq ($(BR2_TARGET_ROOTFS_CPIO_UIMAGE),y)
ROOTFS_CPIO_DEPENDENCIES += host-uboot-tools
define ROOTFS_CPIO_UBOOT_MKIMAGE
diff --git a/fs/cpio/dracut.conf b/fs/cpio/dracut.conf
new file mode 100644
index 0000000000..2337736c4e
--- /dev/null
+++ b/fs/cpio/dracut.conf
@@ -0,0 +1,92 @@
+#Simple dracut config for a system without systemd
+
+#Dracut configuration
+
+show_modules=yes
+i18n_install_all=no
+lvmconf=no
+mdadmconf=no
+early_microcode=no
+hostonly=no
+hostonly_cmdline=no
+use_fstab=no
+kernel_cmdline="rd.break=initqueue"
+do_strip=no
+
+# Dracut modules needed
+add_dracutmodules+=" \
+busybox-init
+"
+
+# Modules to ignore
+omit_dracutmodules+=" \
+bash \
+biosdevname \
+btrfs \
+bluetooth \
+busybox \
+caps \
+cifs \
+crypt \
+crypt-gpg \
+dash \
+dbus-broker \
+dbus-daemon \
+dm \
+dmraid \
+dmsquash-live-ntfs \
+dracut-systemd \
+fcoe \
+fcoe-uefi \
+fs-lib \
+iscsi \
+i18n \
+lvmmerge \
+lvm \
+lunmask \
+mdraid \
+memstrack \
+mksh \
+modsign \
+mount-root \
+multipath \
+nbd \
+network-legacy \
+network-wicked \
+nfs \
+nvdimm \
+nvmf \
+parse-lunmask \
+qemu \
+qemu-net \
+resume \
+rootfs-block \
+rngd \
+systemd \
+systemd-udevd \
+systemd-coredump \
+systemd-ask-password \
+systemd-timedated \
+systemd-rfkill \
+systemd-resolved \
+systemd-hostnamed \
+systemd-initrd \
+systemd-journald \
+systemd-ldconfig \
+systemd-networkd \
+systemd-timesyncd \
+systemd-veritysetup \
+systemd-modules-load \
+systemd-sysctl \
+systemd-repart \
+systemd-sysext \
+systemd-sysusers \
+systemd-tmpfiles \
+squash \
+ssh-client \
+stratis \
+tpm2-tss \
+udev-rules \
+url-lib \
+usrmount \
+"
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