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nixos-install: fix missing initrd.secrets paths
When installing NixOS in the target filesystem /mnt, paths relative to configuration.nix in `initrd.secrets` are turned by Nix into absolute paths that reference /mnt. While building the system derivation works, installing the bootloader fails because the latter process takes place inside the chroot environment where /mnt does not exist. Ideally, we would also build the system within chroot, but this greatly complicates the matter as it requires manually copying over Nix, its runtime dependencies and all channels. Possibly, this would also break several assumptions users have about how nixos-install works. A simpler and safer (but less neat) solution is to temporarily bind mount all mount points in /mnt under /mnt/mnt to keep the paths functional while the bootloader is being installed. This is essentially the workaround described in issue #73404.
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@ -188,6 +188,15 @@ nix-env --store "$mountPoint" "${extraBuildFlags[@]}" \
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mkdir -m 0755 -p "$mountPoint/etc"
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touch "$mountPoint/etc/NIXOS"
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# Create a bind mount for each of the mount points inside the target file
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# system. This preserves the validity of their absolute paths after changing
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# the root with `nixos-enter`.
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# Without this the bootloader installation may fail due to options that
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# contain paths referenced during evaluation, like initrd.secrets.
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mount --rbind --mkdir "$mountPoint" "$mountPoint$mountPoint"
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mount --make-rslave "$mountPoint$mountPoint"
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trap 'umount -R "$mountPoint$mountPoint" && rmdir "$mountPoint$mountPoint"' EXIT
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# Switch to the new system configuration. This will install Grub with
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# a menu default pointing at the kernel/initrd/etc of the new
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# configuration.
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