Files
forgefirm/forgetest/tests
ScottW514 754c239e08 test_image: the hostname and the banner scripts, run over a scratch tree
MachineNameTests runs the layer's own forgefirm-hostname and
forgefirm-banner in private mount, UTS and network namespaces: /run a
fresh tmpfs, a scratch directory over /sys/class/net, /etc a read-only
overlay with the scratch hostname and issue over the host's (so each
script makes its copy under /run/forgefirm and writes through its own
bind mount, as at boot). unshare -Urmun where user namespaces are open,
sudo -n unshare -mun otherwise; skipped only where neither makes a
namespace.

- the name: wlan0's last four hex digits (forgefirm-12ab with eth0 beside
  it), eth0's with no wlan0, eth0's with a zero wlan0 MAC; the live name
  and /etc/hostname agree.
- the banner: the image's text, then the heading and one URL per global
  address of wlan0 (a veth carrying 192.0.2.5, 2001:db8::5 and fe80::5):
  https://192.0.2.5/ and https://[2001:db8::5]/, the link-local address
  left out, no marker line, no .local name.

Proof: test_image.py under Linux by both namespace routes (9 tests OK),
and on Windows with the two skipped. Mutants of scratch copies of the
scripts, each failing: eth0 read before wlan0, a zero MAC taken, the file
written without the script's bind mount, a marker line in the banner, a
.local URL, the link-local address kept.

setup.machine-name stays: the DHCP client's -x hostname and no mDNS
responder on the image are image content. Nothing under meta-forgefirm
changed.
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