these 3 derivations will be built:
  /nix/store/d2ii0garsmvg7xjlpiz2q83h8yblyly6-nix-eval-jobs-stub.drv
  /nix/store/bs8xn4xbq8yfjqyxc0x19g806acn1g80-nix-eval-jobs.drv
  /nix/store/x3wh1c1gmhnscls078662155jigfzjs9-nix-eval-lock-rehearsal.drv
these 12 paths will be fetched (0.0 KiB download, 29.3 MiB unpacked):
  /nix/store/3hqwbwxij9lxhyrf2amsm2xg24xszmmx-bubblewrap-0.12.0
  /nix/store/ni6f4aw55ydx324a7y9blxp85dqps6i8-bubblewrap-0.12.0-dev
  /nix/store/6yhar0n69in9l6pk2z5bjifdx34zdad3-libbsd-0.12.2
  /nix/store/1ay4bcfpqrfci746d0i01wwwxisdhciy-libmd-1.3.0
  /nix/store/82qxn7mh0g7wdfg7a82ndpnsai03bk5y-shadow-4.20.3
  /nix/store/gar3j11kma6qrz31z6kfpn6sk6gwk16x-tcb-1.2
  /nix/store/2lgg8jqyzjp60svh7kmp39kqwnig31p2-util-linux-2.42.4-bin
  /nix/store/jnzd79phi9hwp4fvm5na4hl8hczw53pa-util-linux-2.42.4-lastlog
  /nix/store/b3xa3ynx8025bgwbql3ca23qyh576qhy-util-linux-2.42.4-lib
  /nix/store/82spanbs1az551h0wag8z2ryb67n38vz-util-linux-2.42.4-login
  /nix/store/9xzvspslb052smabjvcipmpcsi7vjjb6-util-linux-2.42.4-mount
  /nix/store/fkv0c0b665q6ixm9syazddzrv8qwmh1n-util-linux-2.42.4-swap
building '/nix/store/d2ii0garsmvg7xjlpiz2q83h8yblyly6-nix-eval-jobs-stub.drv'
nix-eval-jobs-stub> structuredAttrs is enabled
building '/nix/store/bs8xn4xbq8yfjqyxc0x19g806acn1g80-nix-eval-jobs.drv'
nix-eval-jobs> structuredAttrs is enabled
building '/nix/store/x3wh1c1gmhnscls078662155jigfzjs9-nix-eval-lock-rehearsal.drv'
nix-eval-lock-rehearsal> --- uncontended: execs the evaluator with the arguments
nix-eval-lock-rehearsal> --- exit status propagates
nix-eval-lock-rehearsal> --- missing lock file refuses to evaluate
nix-eval-lock-rehearsal> --- second evaluation waits for the holder, then proceeds
nix-eval-lock-rehearsal> --- holder killed: the lock goes with it
nix-eval-lock-rehearsal> /build/.attr-0l2nkwhif96f51f4amnlf414lhl4rv9vh8iffyp431v6s28gsr90: line 75:    58 Killed                     HOLD_UNTIL=run/never nix-eval-jobs doomed > /dev/null 2>&1
nix-eval-lock-rehearsal> --- sandboxed waiter (nixbot's case): read-only lock, holder invisible
nix-eval-lock-rehearsal> --- sandboxed holder: an outside waiter names it
warning: SQLite database '/nix/var/nix/db/db.sqlite' is busy

upload niks3: ok