[root@nix:/home/USER]# tail -17 /etc/nixos/configuration.nix
  fileSystems."/mnt/hgfs" = {
    #device = ".host:/";
    #fsType = "vmhgfs";
    device = "vmhgfs-fuse";
    fsType = "fuse";
    options = [
      "rw"
      "nosuid"
      "nodev"
      "nofail"
      "relatime"
      "ttl=5"
      "uid=USER"
      "gid=USER"
    ];
  };
}


[root@nix:/home/USER]# nixos-rebuild test
building Nix...
building the system configuration...
these derivations will be built:
  /nix/store/hy8nz4sgiarqamx81cbm37ghqj062jmz-unit-mnt-hgfs.mount.service.drv
  /nix/store/4m79aq3v8b4rr532bsibh70cr4jhcmkh-system-units.drv
  /nix/store/8zvzk31qd3igsww51yrp87a7bwc73a2n-etc.drv
  /nix/store/0wsidj9dxhpn7bc3rajz6mqcmq79mxzi-nixos-system-nix-18.03.133192.45f52f765cd.drv
building '/nix/store/hy8nz4sgiarqamx81cbm37ghqj062jmz-unit-mnt-hgfs.mount.service.drv'...
building '/nix/store/4m79aq3v8b4rr532bsibh70cr4jhcmkh-system-units.drv'...
building '/nix/store/8zvzk31qd3igsww51yrp87a7bwc73a2n-etc.drv'...
building '/nix/store/0wsidj9dxhpn7bc3rajz6mqcmq79mxzi-nixos-system-nix-18.03.133192.45f52f765cd.drv'...
activating the configuration...
setting up /etc...
setting up tmpfiles
warning: the following units failed: mnt-hgfs.mount

● mnt-hgfs.mount - /mnt/hgfs
   Loaded: loaded (/etc/fstab; generated)
   Active: failed (Result: exit-code) since Tue 2018-09-18 00:05:08 CEST; 22ms ago
    Where: /mnt/hgfs
     What: vmhgfs-fuse
     Docs: man:fstab(5)
           man:systemd-fstab-generator(8)
  Process: 9135 ExecMount=/nix/store/d49n6q7b197j2nsnbdvn6i55rsnmiyq1-util-linux-2.31.1-bin/bin/mount vmhgfs-fuse /mnt/hgfs -t fuse -o rw,nosuid,nodev,relatime,ttl=5,uid=USER,gid=USER (code=exited, status=127)

Sep 18 00:05:08 nix systemd[1]: Mounting /mnt/hgfs...
Sep 18 00:05:08 nix mount[9135]: /bin/sh: vmhgfs-fuse: command not found
Sep 18 00:05:08 nix systemd[1]: mnt-hgfs.mount: Mount process exited, code=exited status=127
Sep 18 00:05:08 nix systemd[1]: mnt-hgfs.mount: Failed with result 'exit-code'.
Sep 18 00:05:08 nix systemd[1]: Failed to mount /mnt/hgfs.
warning: error(s) occurred while switching to the new configuration


[root@nix:/home/USER]# ls -l /nix/store/*/*mnt-hgfs*
lrwxrwxrwx 1 root root   94 Jan  1  1970 /nix/store/4a8nfhf044gh7pf3ha1r7glhw2lpnnv3-system-units/mnt-hgfs.mount.service -> /nix/store/f9v616h5k9d4yp24gdnnczlrwhjfq5y7-unit-mnt-hgfs.mount.service/mnt-hgfs.mount.service
-r--r--r-- 1 root root 1013 Jan  1  1970 /nix/store/f9v616h5k9d4yp24gdnnczlrwhjfq5y7-unit-mnt-hgfs.mount.service/mnt-hgfs.mount.service


[root@nix:/home/USER]# cat /nix/store/f9v616h5k9d4yp24gdnnczlrwhjfq5y7-unit-mnt-hgfs.mount.service/mnt-hgfs.mount.service
[Unit]

[Service]
Environment="LOCALE_ARCHIVE=/nix/store/v2hvbpzhndgjm04djqql93bmb4w69gql-glibc-locales-2.26-131/lib/locale/locale-archive"
Environment="PATH=/nix/store/b57ima90i77cjyav2ijs73zd6hjng9d3-open-vm-tools-10.1.10/bin:/nix/store/920k63py2w97xpfyb5ps9l6wbidvzfjz-coreutils-8.29/bin:/nix/store/hlgglqv1vm88frmysq2laifavxjhaf55-findutils-4.6.0/bin:/nix/store/iywd02hbirf506q740z0v6zyrvsa9gcf-gnugrep-3.1/bin:/nix/store/wkgszaq2dkc4asapcbx6ypd7xdnzad9f-gnused-4.4/bin:/nix/store/3hmpbbcv1db42m9g34c9g4q6qinw50x4-systemd-237/bin:/nix/store/b57ima90i77cjyav2ijs73zd6hjng9d3-open-vm-tools-10.1.10/sbin:/nix/store/920k63py2w97xpfyb5ps9l6wbidvzfjz-coreutils-8.29/sbin:/nix/store/hlgglqv1vm88frmysq2laifavxjhaf55-findutils-4.6.0/sbin:/nix/store/iywd02hbirf506q740z0v6zyrvsa9gcf-gnugrep-3.1/sbin:/nix/store/wkgszaq2dkc4asapcbx6ypd7xdnzad9f-gnused-4.4/sbin:/nix/store/3hmpbbcv1db42m9g34c9g4q6qinw50x4-systemd-237/sbin"
Environment="TZDIR=/nix/store/k8n4sf0yfas70yfv156knrpv9xfipjwm-tzdata-2017c/share/zoneinfo"


[root@nix:/home/USER]# find /nix/store/b57ima90i77cjyav2ijs73zd6hjng9d3-open-vm-tools-10.1.10/ -iname '*hgfs*'
/nix/store/b57ima90i77cjyav2ijs73zd6hjng9d3-open-vm-tools-10.1.10/bin/mount.vmhgfs
/nix/store/b57ima90i77cjyav2ijs73zd6hjng9d3-open-vm-tools-10.1.10/bin/vmhgfs-fuse
/nix/store/b57ima90i77cjyav2ijs73zd6hjng9d3-open-vm-tools-10.1.10/bin/vmware-hgfsclient
/nix/store/b57ima90i77cjyav2ijs73zd6hjng9d3-open-vm-tools-10.1.10/lib/libhgfs.so
/nix/store/b57ima90i77cjyav2ijs73zd6hjng9d3-open-vm-tools-10.1.10/lib/open-vm-tools/plugins/common/libhgfsServer.la
/nix/store/b57ima90i77cjyav2ijs73zd6hjng9d3-open-vm-tools-10.1.10/lib/open-vm-tools/plugins/common/libhgfsServer.so
/nix/store/b57ima90i77cjyav2ijs73zd6hjng9d3-open-vm-tools-10.1.10/lib/libhgfs.so.0.0.0
/nix/store/b57ima90i77cjyav2ijs73zd6hjng9d3-open-vm-tools-10.1.10/lib/libhgfs.la
/nix/store/b57ima90i77cjyav2ijs73zd6hjng9d3-open-vm-tools-10.1.10/lib/libhgfs.so.0