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ff525695f2
As stated in our top level license files, the license is MIT unless otherwise stated. Add SPDX identifers accordingly. Replace older license statementa with the standardised syntax. Also drop "All Rights Reserved" expression as it isn't used now, doesn't mean anything and is confusing. (From OE-Core rev: 081a391fe09a21265881e39a2a496e4e10b4f80b) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
83 lines
3.8 KiB
Plaintext
83 lines
3.8 KiB
Plaintext
#
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# Copyright OpenEmbedded Contributors
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#
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# SPDX-License-Identifier: MIT
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#
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# Class for setting up /etc in overlayfs
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#
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# In order to have /etc directory in overlayfs a special handling at early boot stage is required
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# The idea is to supply a custom init script that mounts /etc before launching actual init program,
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# because the latter already requires /etc to be mounted
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#
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# The configuration must be machine specific. You should at least set these three variables:
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# OVERLAYFS_ETC_MOUNT_POINT ?= "/data"
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# OVERLAYFS_ETC_FSTYPE ?= "ext4"
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# OVERLAYFS_ETC_DEVICE ?= "/dev/mmcblk0p2"
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#
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# To control more mount options you should consider setting mount options:
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# OVERLAYFS_ETC_MOUNT_OPTIONS ?= "defaults"
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#
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# The class provides two options for /sbin/init generation
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# 1. Default option is to rename original /sbin/init to /sbin/init.orig and place generated init under
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# original name, i.e. /sbin/init. It has an advantage that you won't need to change any kernel
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# parameters in order to make it work, but it poses a restriction that package-management can't
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# be used, becaause updating init manager would remove generated script
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# 2. If you are would like to keep original init as is, you can set
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# OVERLAYFS_ETC_USE_ORIG_INIT_NAME = "0"
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# Then generated init will be named /sbin/preinit and you would need to extend you kernel parameters
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# manually in your bootloader configuration.
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#
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# Regardless which mode you choose, update and migration strategy of configuration files under /etc
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# overlay is out of scope of this class
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ROOTFS_POSTPROCESS_COMMAND += '${@bb.utils.contains("IMAGE_FEATURES", "overlayfs-etc", "create_overlayfs_etc_preinit;", "", d)}'
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IMAGE_FEATURES_CONFLICTS_overlayfs-etc = "${@ 'package-management' if bb.utils.to_boolean(d.getVar('OVERLAYFS_ETC_USE_ORIG_INIT_NAME'), True) else ''}"
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OVERLAYFS_ETC_MOUNT_POINT ??= ""
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OVERLAYFS_ETC_FSTYPE ??= ""
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OVERLAYFS_ETC_DEVICE ??= ""
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OVERLAYFS_ETC_USE_ORIG_INIT_NAME ??= "1"
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OVERLAYFS_ETC_MOUNT_OPTIONS ??= "defaults"
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OVERLAYFS_ETC_INIT_TEMPLATE ??= "${COREBASE}/meta/files/overlayfs-etc-preinit.sh.in"
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python create_overlayfs_etc_preinit() {
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overlayEtcMountPoint = d.getVar("OVERLAYFS_ETC_MOUNT_POINT")
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overlayEtcFsType = d.getVar("OVERLAYFS_ETC_FSTYPE")
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overlayEtcDevice = d.getVar("OVERLAYFS_ETC_DEVICE")
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if not overlayEtcMountPoint:
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bb.fatal("OVERLAYFS_ETC_MOUNT_POINT must be set in your MACHINE configuration")
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if not overlayEtcDevice:
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bb.fatal("OVERLAYFS_ETC_DEVICE must be set in your MACHINE configuration")
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if not overlayEtcFsType:
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bb.fatal("OVERLAYFS_ETC_FSTYPE should contain a valid file system type on {0}".format(overlayEtcDevice))
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with open(d.getVar("OVERLAYFS_ETC_INIT_TEMPLATE"), "r") as f:
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PreinitTemplate = f.read()
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useOrigInit = oe.types.boolean(d.getVar('OVERLAYFS_ETC_USE_ORIG_INIT_NAME'))
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preinitPath = oe.path.join(d.getVar("IMAGE_ROOTFS"), d.getVar("base_sbindir"), "preinit")
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initBaseName = oe.path.join(d.getVar("base_sbindir"), "init")
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origInitNameSuffix = ".orig"
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args = {
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'OVERLAYFS_ETC_MOUNT_POINT': overlayEtcMountPoint,
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'OVERLAYFS_ETC_MOUNT_OPTIONS': d.getVar('OVERLAYFS_ETC_MOUNT_OPTIONS'),
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'OVERLAYFS_ETC_FSTYPE': overlayEtcFsType,
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'OVERLAYFS_ETC_DEVICE': overlayEtcDevice,
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'SBIN_INIT_NAME': initBaseName + origInitNameSuffix if useOrigInit else initBaseName
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}
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if useOrigInit:
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# rename original /sbin/init
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origInit = oe.path.join(d.getVar("IMAGE_ROOTFS"), initBaseName)
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bb.debug(1, "rootfs path %s, init path %s, test %s" % (d.getVar('IMAGE_ROOTFS'), origInit, d.getVar("IMAGE_ROOTFS")))
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bb.utils.rename(origInit, origInit + origInitNameSuffix)
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preinitPath = origInit
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with open(preinitPath, 'w') as f:
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f.write(PreinitTemplate.format(**args))
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os.chmod(preinitPath, 0o755)
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}
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