80 lines
3.9 KiB
Plaintext
80 lines
3.9 KiB
Plaintext
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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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OVERLAYFS_ETC_EXPOSE_LOWER ??= "0"
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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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exposeLower = oe.types.boolean(d.getVar('OVERLAYFS_ETC_EXPOSE_LOWER'))
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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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'OVERLAYFS_ETC_EXPOSE_LOWER': "true" if exposeLower else "false"
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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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