Follow-up to @benbarclay's #30136 salvage. The pre-existing PID-1
contract tests in tests/tools/test_dockerfile_pid1_reaping.py (added
with #15012) hardcoded tini/dumb-init/catatonit as the only accepted
inits, so they failed after #30136 replaced tini with s6-overlay's
/init.
s6-overlay's PID 1 is s6-svscan, which reaps zombies non-blockingly
on SIGCHLD — same contract the test exists to enforce. Two updates:
* test_dockerfile_installs_an_init_for_zombie_reaping — accept
's6-overlay' as a known-installed marker (matches the
s6-overlay install layer in Ben's Dockerfile).
* test_dockerfile_entrypoint_routes_through_the_init — accept
'/init' as a known-routed marker (s6-overlay's PID-1 binary
lives at /init by convention).
Both assertions still fire if a future Dockerfile rewrite drops
the init entirely. Local: 7/7 pass.
teknium1
7f6f00f6ec