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Filename : snapd-set-hostname.service

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# Set the true hostname.
#
# systemd has already set the hostname when this unit executes (based on
# the original /etc/hostname).
#
# However, since that file is on the read-only rootfs and the real
# hostname is on the writable partition (/etc/writable bind-mount), it
# is necessary to reset the hostname as soon as the true hostname file
# is available.

[Unit]
Description=Set the hostname to the value stored on the writable partition
After=etc-writable.mount
DefaultDependencies=no

[Service]
Type=oneshot
ExecStart=/bin/hostname -F /etc/hostname