these 3 derivations will be built:
  /nix/store/n449ri3m2xza709a2w443cs6kxrawbpw-nix-eval-jobs-stub.drv
  /nix/store/70dpzk0wnavh8xi98jbsz66ghjrlc7k4-nix-eval-jobs.drv
  /nix/store/rip636j3k8pn36m28sym3zxh202z4qy2-nix-eval-lock-rehearsal.drv
these 12 paths will be fetched (0.0 KiB download, 31.1 MiB unpacked):
  /nix/store/0f0s8il3qc3q5vzk4dg7169sap701r10-bubblewrap-0.12.0-dev
  /nix/store/63r4x6k85swqqrz3gjvjj5lsc27vdh6v-libbsd-0.12.2
  /nix/store/45n6szipdgr92xk6a71d68yxy7nk5smb-libmd-1.2.0
  /nix/store/1x1p9srrm7a4fa6nqaw2b4jlfsqv9chq-procps-4.0.7
  /nix/store/x890di8agmyh7h7cbnrpj5rajlfs7ghk-shadow-4.20.2
  /nix/store/53pxakn1y52i0m0fklnb8xfhas93l3fi-tcb-1.2
  /nix/store/vhz3kzcdznprs2wflg44szkbrfji9z3v-util-linux-2.42.3-bin
  /nix/store/xx02hjyazza7h8dw0jx8zamsxhl16g8q-util-linux-2.42.3-lastlog
  /nix/store/ck0idn9br0rq7a823q5fcm5njkmnzkl7-util-linux-2.42.3-lib
  /nix/store/59sv9nvpm77ff4mazcandbx3q2367qsh-util-linux-2.42.3-login
  /nix/store/z8ly41hqdg0hmdv4idlvpsxsdk2rbanj-util-linux-2.42.3-mount
  /nix/store/kl6x1s2x7wm1m3zn7l90gv0g35yd49ds-util-linux-2.42.3-swap
building '/nix/store/n449ri3m2xza709a2w443cs6kxrawbpw-nix-eval-jobs-stub.drv'
nix-eval-jobs-stub> structuredAttrs is enabled
building '/nix/store/70dpzk0wnavh8xi98jbsz66ghjrlc7k4-nix-eval-jobs.drv'
nix-eval-jobs> structuredAttrs is enabled
building '/nix/store/rip636j3k8pn36m28sym3zxh202z4qy2-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 76:    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

upload niks3: ok