commit 19a9aab970c7637688a88eb22c76c4d3933ab23b · ryan.freumh.org/nixos

+46 -1

hosts/dell-xps/default.nix

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       { pkgs, lib, ... }:

     

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       { pkgs, lib, config, ... }:

     

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       {

     

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         imports = [

     
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         # sometimes I want to keep the cache for operating without internet

     

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         nix.gc.automatic = lib.mkForce false;

     

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         systemd.services.backup = {

     

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           description = "Backup service";

     

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           script = let backup = pkgs.writeShellScript "backup.sh" ''

     

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             LAST_RUN_FILE="/var/run/last_backup"

     

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             DISK="/dev/disk/by-label/external-hdd"

     

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             if [ -f "$LAST_RUN_FILE" ] && [ "$(( $(date +%s) - $(date +%s -r "$LAST_RUN_FILE") ))" -lt 86400 ]; then

     

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                 echo "<24hrs"

     

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                 exit 0

     

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             fi

     

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             # if no external-hdd

     

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             if [ ! -e $DISK ]; then

     

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               echo "No $DISK"

     

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               exit 0

     

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             fi

     

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             ${pkgs.util-linux}/bin/mount /dev/disk/by-label/external-hdd /media/external-hdd/ || exit 1

     

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             if

     

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               ${pkgs.rsync}/bin/rsync -va --exclude={".cache",".local/share/Steam/"} /home/${config.custom.username}/ /media/external-hdd/home/

     

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             then

     

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               touch "$LAST_RUN_FILE"

     

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               ${pkgs.util-linux}/bin/umount /media/external-hdd/

     

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             else

     

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               ${pkgs.util-linux}/bin/umount /media/external-hdd/

     

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               exit 1

     

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             fi

     

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           ''; in "${backup}";

     

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           serviceConfig = {

     

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             Type = "oneshot";

     

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           };

     

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           # trigger on wake

     

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           wantedBy = [ "suspend.target" "hibernate.target" "hybrid-sleep.target" "suspend-then-hibernate.target" ];

     

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         };

     

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         # trigger backup on hard drive connection

     

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         services.udev.extraRules =

     

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           # NB could check device label with a trigger script that checks $0 and `RUN+="${trigger} /media/$env{ID_FS_LABEL}"`

     

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           # but we just assume the Seagate Expansion Desk is the same as /dev/disk/by-label/external-hdd

     

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           # UDEV has crap support for detecting devices

     

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           ''

     

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           ACTION=="add", SUBSYSTEM=="block", KERNEL=="sd[a-z]*[0-9]*", ATTRS{model}=="Expansion Desk  ", ATTRS{vendor}=="Seagate ", TAG+="systemd", ENV{SYSTEMD_WANTS}+="backup"

     

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         '';

     

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       }

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scripts/backup.sh

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       #!/usr/bin/env sh

     

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       rsync -va ~/ /run/media/ryan/external-hdd/

     

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       rsync -va --exclude={".cache", ".local/share/Steam/"} ~/ /run/media/ryan/external-hdd/home/