/usr/share/doc/cloud-init/examples/cloud-config-add-apt-repos.txt is in cloud-init 0.7.6~bzr976-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Add apt repositories
#
# Default: auto select based on cloud metadata
# in ec2, the default is <region>.archive.ubuntu.com
# apt_mirror:
# use the provided mirror
# apt_mirror_search:
# search the list for the first mirror.
# this is currently very limited, only verifying that
# the mirror is dns resolvable or an IP address
#
# if neither apt_mirror nor apt_mirror search is set (the default)
# then use the mirror provided by the DataSource found.
# In EC2, that means using <region>.ec2.archive.ubuntu.com
#
# if no mirror is provided by the DataSource, and 'apt_mirror_search_dns' is
# true, then search for dns names '<distro>-mirror' in each of
# - fqdn of this host per cloud metadata
# - localdomain
# - no domain (which would search domains listed in /etc/resolv.conf)
# If there is a dns entry for <distro>-mirror, then it is assumed that there
# is a distro mirror at http://<distro>-mirror.<domain>/<distro>
#
# That gives the cloud provider the opportunity to set mirrors of a distro
# up and expose them only by creating dns entries.
#
# if none of that is found, then the default distro mirror is used
apt_mirror: http://us.archive.ubuntu.com/ubuntu/
apt_mirror_search:
- http://local-mirror.mydomain
- http://archive.ubuntu.com
apt_mirror_search_dns: False
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