Zbigniew Jędrzejewski-Szmek
a0043bfa51
When systemd-firstboot (or any other unit which uses the tty) is started, systemd will reset the terminal. If systemd-vconsole-setup happens to be running at that time, it'll error out when it tries to use the vconsole fd and gets an EIO from ioctl.e019ea738dwas the first fix. It added an implicit ordering between units using the tty and systemd-vconsole-setup. (The commit title is wrong. The approach was generalized, but the commit title wasn't updated.) Thencea32691c3was added to restart systemd-vconsole-setup.service from systemd-firstboot.service. This was OK, with the ordering in place, systemd-vconsole-setup.service would wait until systemd-firstboot.service exited. But this wasn't enough, because we want the key mappings to be loaded immediately after systemd-firstboot writes the config.8eb668b9abimplemented that, but actually reintroduced the original issue. I had to drop the ordering between the two units because otherwise we'd deadlock, waiting from firstboot for vconsole-setup which wouldn't start while firstboot was running. Restarting vconsole-setup.service from systemd-firstboot.service works just fine, but when vconsole-setup.service is started earlier, it may be interrupted by systemd-firstboot.service. To resolve the issue, let's take a lock around the tty device. The reset is performed after fork, so the (short) delay should not matter too much. In xopenat_lock() the assert on <path> is dropped so that we can call xopenat(fd, NULL) to get a copy of the original fd. Fixes #26908.
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