Dongsu Park
d7bea6b629
Add a new option `--network-namespace-path` to systemd-nspawn to allow users to specify an arbitrary network namespace, e.g. `/run/netns/foo`. Then systemd-nspawn will open the netns file, pass the fd to outer_child, and enter the namespace represented by the fd before running inner_child. ``` $ sudo ip netns add foo $ mount | grep /run/netns/foo nsfs on /run/netns/foo type nsfs (rw) ... $ sudo systemd-nspawn -D /srv/fc27 --network-namespace-path=/run/netns/foo \ /bin/readlink -f /proc/self/ns/net /proc/1/ns/net:[4026532009] ``` Note that the option `--network-namespace-path=` cannot be used together with other network-related options such as `--private-network` so that the options do not conflict with each other. Fixes https://github.com/systemd/systemd/issues/7361
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