is there a way to fallback on None Datasource None during ds-identify instead of disabling cloud-init

[grosbaloon]

Hello

when no data source is provided, is there a way to fallback on Datasource none during ds-identify instead of disabling cloud-init ?

Let me explain.

Download ubuntu cloud image and change root password (without using cloud init)

wget https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img
virt-customize -a noble-server-cloudimg-amd64.img --root-password password:pass

start image without data source :
qemu-system-x86_64 -m 2G -enable-kvm -cpu host -smp 4 -hda noble-server-cloudimg-amd64.img -netdev user,id=n1,hostfwd=tcp::60671-:22 -device virtio-net,netdev=n1,addr=03 -device e1000,netdev=n2,addr=04 -netdev user,id=n2 -device e1000,netdev=n3,addr=05 -netdev user,id=n3 -netdev user,id=n4 -net none -display none -nographic

ds-identify will not find any datasource and cloud init will be disabled
because of ds-identify default policy : search,found=all,maybe=none,notfound=disabled

root@ubuntu:~# cloud-id
disabled

I tried to change the policy to search,found=all,maybe=all,notfound=enabled in /etc/cloud/ds-identify.cfg
In that case, ds-identify will not find any datasource, cloud-init is enabled.
At runtime, cloud-init scan all possible datasources (takes a long time) and
finally fallback to datasource none.

root@ubuntu:~# cloud-id
none

and have the warning:

**************************************************************************
# A new feature in cloud-init identified possible datasources for        #
# this system as:                                                        #
#   []                                                                   #
# However, the datasource used was: None                                 #
#                                                                        #
# In the future, cloud-init will only attempt to use datasources that    #
# are identified or specifically configured.                             #
# For more information see                                               #
#   https://bugs.launchpad.net/bugs/1669675                              #
#                                                                        #
# If you are seeing this message, please file a bug against              #
# cloud-init at                                                          #
#    https://github.com/canonical/cloud-init/issues                      #
# Make sure to include the cloud provider your instance is               #
# running on.                                                            #
#                                                                        #
# After you have filed a bug, you can disable this warning by launching  #
# your instance with the cloud-config below, or putting that content     #
# into /etc/cloud/cloud.cfg.d/99-warnings.cfg                            #
#                                                                        #
# #cloud-config                                                          #
# warnings:                                                              #
#   dsid_missing_source: off                                             #
**************************************************************************

Is there any configuration option to fallback on datasource none during ds-identify instead ?

[holmanb]

Is there any configuration option to fallback on datasource none during ds-identify instead ?

It's in the docs. Look up datasource_list.