I did the same exercise on my reproducer and got the following pstree
output:
When is switch to vtty with systemd.debug-shell=1, here what I got :
# pstree
systemd-+-bash---pstree
|-recovery-menu---network---systemctl---systemd-tty-ask
|-systemd-journal
....
# ps
root 486 473 0 08:29 tty1 00:00:00 /bin/systemd-tty-ask-password-agent
# PID 473 being systemctl start dbus.socket :
root 473 466 0 08:29 tty1 00:00:00 systemctl start dbus.socket
# PID 466 being recovery-mode/options/network
root 466 283 0 08:29 tty1 00:00:00 /bin/sh /lib/recovery-mode/options/network
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https://bugs.launchpad.net/bugs/1682637
Title:
during recovery mode, enable network failed due to /etc/resolv.conf
not being present
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