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package/skeleton-init-openrc: add support to remount rootfs as rw

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Add a pseudo entry for /dev/root in fstab, to tell openrc to properly
remount or not remount / read-write.

For consistency with systemd (which is the only other init system to
tweak an fstab basd on / being rw or not), we do this change in the
openrc skeleton rather than in the openrc package.

Signed-off-by: Michał Łyszczek <michal.lyszczek@bofc.pl>
[yann.morin.1998@free.fr:
  - tweak the sed expressions
  - reword commit log
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Michał Łyszczek 2019-08-04 14:14:16 +02:00 committed by Thomas Petazzoni
parent 162044407b
commit af8c7b41f5
2 changed files with 16 additions and 0 deletions
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15
package/skeleton-init-openrc/skeleton-init-openrc.mk
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@ -15,8 +15,23 @@ SKELETON_INIT_OPENRC_DEPENDENCIES = skeleton-init-common
SKELETON_INIT_OPENRC_PROVIDES = skeleton
ifeq ($(BR2_TARGET_GENERIC_REMOUNT_ROOTFS_RW),y)
# Comment /dev/root entry in fstab. When openrc does not find fstab entry for
# "/", it will try to remount "/" as "rw".
define SKELETON_INIT_OPENRC_ROOT_RO_OR_RW
$(SED) '\:^/dev/root :s/^/# /' $(TARGET_DIR)/etc/fstab
endef
else
# Uncomment /dev/root entry in fstab which has "ro" option so openrc notices
# it and doesn't remount root to rw.
define SKELETON_INIT_OPENRC_ROOT_RO_OR_RW
$(SED) '\:^# /dev/root:s/^# //' $(TARGET_DIR)/etc/fstab
endef
endif # BR2_TARGET_GENERIC_REMOUNT_ROOTFS_RW
define SKELETON_INIT_OPENRC_INSTALL_TARGET_CMDS
$(call SYSTEM_RSYNC,$(SKELETON_INIT_OPENRC_PKGDIR)/skeleton,$(TARGET_DIR))
$(SKELETON_INIT_OPENRC_ROOT_RO_OR_RW)
endef
$(eval $(generic-package))

1
package/skeleton-init-openrc/skeleton/etc/fstab
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@ -1,3 +1,4 @@
# <file system> <mount pt> <type> <options> <dump> <pass>
/dev/root / ext2 ro,noauto 0 0
tmpfs /tmp tmpfs mode=1777 0 0
tmpfs /run tmpfs mode=0755,nosuid,nodev 0 0