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author | Bruce Ashfield <bruce.ashfield@gmail.com> | 2021-11-22 20:28:27 +0000 |
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committer | Bruce Ashfield <bruce.ashfield@gmail.com> | 2021-12-13 15:59:35 -0500 |
commit | 491a385ca6fd6e47c364d0bda0ffdf557eec6da0 (patch) | |
tree | 0f4905717b68e04976ab815ee473747dc59187df /classes | |
parent | 6fe326b68012b0eae5c951ab21d55b0ccfda84f9 (diff) | |
download | meta-virtualization-491a385ca6fd6e47c364d0bda0ffdf557eec6da0.tar.gz |
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 <bruce.ashfield@gmail.com>
Diffstat (limited to 'classes')
-rw-r--r-- | classes/meta-virt-hosts.bbclass | 29 |
1 files changed, 29 insertions, 0 deletions
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 @@ | |||
1 | # This doesn't work, since it seems to be too late for sanity checking. | ||
2 | # IMAGE_FEATURES[validitems] += ' ${@bb.utils.contains("DISTRO_FEATURES", "virtualization", "virt-unique-hostname; ", "",d)}' | ||
3 | |||
4 | ROOTFS_POSTPROCESS_COMMAND += '${@bb.utils.contains("IMAGE_FEATURES", "virt-unique-hostname", "virt_gen_hostname; ", "",d)}' | ||
5 | ROOTFS_POSTPROCESS_COMMAND += '${@bb.utils.contains("IMAGE_FEATURES", "virt-unique-hostname", "virt_set_hostname; ", "",d)}' | ||
6 | |||
7 | python virt_gen_hostname() { | ||
8 | import uuid | ||
9 | |||
10 | targetname = d.getVar("VIRT_TARGETNAME") | ||
11 | if targetname != None: | ||
12 | return | ||
13 | |||
14 | status, date = oe.utils.getstatusoutput("date +%d-%m-%y") | ||
15 | if status: | ||
16 | bb.warn("Can't get the date string for target hostname") | ||
17 | |||
18 | uuid = ':'.join(['{:02x}'.format((uuid.getnode() >> ele) & 0xff) for ele in range(0,8*6,8)][::-1]) | ||
19 | if uuid: | ||
20 | targetname = "%s-%s" % (d.getVar("MACHINE"), uuid.split(":")[0]) | ||
21 | else: | ||
22 | targetname = "%s-%s" % (d.getVar("MACHINE"), date) | ||
23 | |||
24 | d.setVar("VIRT_TARGETNAME", targetname) | ||
25 | } | ||
26 | |||
27 | virt_set_hostname() { | ||
28 | echo "${VIRT_TARGETNAME}" > ${IMAGE_ROOTFS}/etc/hostname | ||
29 | } | ||