ElvishJerricco: After reading your repl, systemd doc and nixpkgs pr, I have several questions:

1. Do we need /sysroot/etc/{crypttab,fstab}? I think currently we have put FSes needed in /etc/fstab and /etc/crypttab of initrd.
2. Is this the shutdown ramfs you mentioned above? Does that pr handles unmounting "root on btrfs raid1 on luks on two disks" correctly? Some FSes is missing in journalctl -b -1 -g Unmounting. Don't know if that is related though.

ElvishJerricco: After reading your reply, systemd doc and nixpkgs pr, I have several questions:

1. Do we need /sysroot/etc/{crypttab,fstab}? I think currently we have put FSes needed in /etc/fstab and /etc/crypttab of initrd.
2. Is this the shutdown ramfs you mentioned above? Does that pr handles unmounting "root on btrfs raid1 on luks on two disks" correctly? Some FSes is missing in journalctl -b -1 -g Unmounting. Don't know if that is related though.

ElvishJerricco: After reading your reply, systemd doc and nixpkgs pr, I have several questions:

1. Do we need /sysroot/etc/{crypttab,fstab}? I think currently we have put FSes needed in /etc/fstab and /etc/crypttab of initrd.
2. Is this the shutdown ramfs you mentioned above? Does that pr handle unmounting "root on btrfs raid1 on luks on two disks" correctly? Some FSes is missing in journalctl -b -1 -g Unmounting. Don't know if that is related though.

linj:

1. As I explained, using /sysroot/etc/{crypttab,fstab} is difficult in nixos, so we currently do it the "wrong" way with /etc.
2. That shutdown ramfs is supposed to work, but I'm not sure why it fails for some setups.

error: builder for '/nix/store/0yx5gvgw3wfa4r5kl7k1mqrji271dm2c-initrd-bin-env.drv' failed with exit code 1;
       last 2 log lines:
       > created 454 symlinks in user environment
       > ln: failed to create symbolic link '/nix/store/dqzxrnrhav933wywsgs0jx0g75pb7v1s-initrd-bin-env/bin/mount': File exists
       For full logs, run 'nix log /nix/store/0yx5gvgw3wfa4r5kl7k1mqrji271dm2c-initrd-bin-env.drv'.

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