From 491a385ca6fd6e47c364d0bda0ffdf557eec6da0 Mon Sep 17 00:00:00 2001 From: Bruce Ashfield Date: Mon, 22 Nov 2021 20:28:27 +0000 Subject: config: introduce hostname generation hooks Overriding hostname in a .conf file, via base-files: HOST_NAME="k3s-host" hostname_pn-base-files = "${HOST_NAME}" Is always a valid option, but if it is not configured, we can easily have two hosts with the same name on the network, confusing adddress assignement, etc. This commit introduces a way to generate a unique hostname based on the uuid of the build host, and the machine being built. If virt-unique-hostname is added to IMAGE_FEATURES, like the following: IMAGE_FEATURES += "virt-unique-hostname" IMAGE_FEATURES[validitems] += "virt-unique-hostname" Then a rootfs postprocessing hook will override hostnae to something unique. Note: this means your image will be reproducible on a single builder, but not between them. Signed-off-by: Bruce Ashfield --- classes/meta-virt-hosts.bbclass | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 classes/meta-virt-hosts.bbclass (limited to 'classes') diff --git a/classes/meta-virt-hosts.bbclass b/classes/meta-virt-hosts.bbclass new file mode 100644 index 00000000..80aefb76 --- /dev/null +++ b/classes/meta-virt-hosts.bbclass @@ -0,0 +1,29 @@ +# This doesn't work, since it seems to be too late for sanity checking. +# IMAGE_FEATURES[validitems] += ' ${@bb.utils.contains("DISTRO_FEATURES", "virtualization", "virt-unique-hostname; ", "",d)}' + +ROOTFS_POSTPROCESS_COMMAND += '${@bb.utils.contains("IMAGE_FEATURES", "virt-unique-hostname", "virt_gen_hostname; ", "",d)}' +ROOTFS_POSTPROCESS_COMMAND += '${@bb.utils.contains("IMAGE_FEATURES", "virt-unique-hostname", "virt_set_hostname; ", "",d)}' + +python virt_gen_hostname() { + import uuid + + targetname = d.getVar("VIRT_TARGETNAME") + if targetname != None: + return + + status, date = oe.utils.getstatusoutput("date +%d-%m-%y") + if status: + bb.warn("Can't get the date string for target hostname") + + uuid = ':'.join(['{:02x}'.format((uuid.getnode() >> ele) & 0xff) for ele in range(0,8*6,8)][::-1]) + if uuid: + targetname = "%s-%s" % (d.getVar("MACHINE"), uuid.split(":")[0]) + else: + targetname = "%s-%s" % (d.getVar("MACHINE"), date) + + d.setVar("VIRT_TARGETNAME", targetname) +} + +virt_set_hostname() { + echo "${VIRT_TARGETNAME}" > ${IMAGE_ROOTFS}/etc/hostname +} -- cgit v1.2.3-54-g00ecf