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[clever@amd-nixos:~]$ ls -ltrh /nix/var/nix/profiles/
total 41K
...
lrwxrwxrwx 1 root root 85 Apr 28 01:49 system-220-link -> /nix/store/syj43al4rkx2v259w9lk9ls0ww3gciy3-nixos-system-amd-nixos-16.09.git.0bf8a1aM
lrwxrwxrwx 1 root root 85 May 22 15:56 system-221-link -> /nix/store/qv3x27id82qaiaafxl6f58ahk7rzsj5g-nixos-system-amd-nixos-16.09.git.0bf8a1aM
lrwxrwxrwx 1 root root 15 May 22 15:56 system -> system-221-link
[clever@amd-nixos:~]$ cd /tmp

[clever@amd-nixos:/tmp]$ mkdir t

[clever@amd-nixos:/tmp]$ cd t
[clever@amd-nixos:/tmp/t]$ cat /nix/var/nix/profiles/system-220-link/initrd | gunzip | cpio -i
36241 blocks
[clever@amd-nixos:/tmp/t]$ ls
dev  etc  init  nix  proc  sys

[clever@amd-nixos:/tmp/t]$ ls nix/store/
2h8gx5h4fm8hy2c5kn07nxcisn7sm35q-kmod-debian-aliases-21-1.conf  biv54v9x0fdni8899bcv99w5yidk5ia6-udev-rules       l9hbczni9ing9zwr1d3d39ivzy9nfggi-kernel-modules-shrunk
6l76pv3hc2wa31v23d012jl6hnxhpil0-mdadm.conf                     k6r4c7rgm62vyzy17v4y70sj3gdv6iyp-initrd-fsinfo    rij0ywg83yhj7b0g2wwdvqw4rjqqz3n5-extra-utils
9h088wgsl8zqaxwcgxas7yy2kcdfgqzp-boottime-keymap                l8dhqa2as0rwhsxharx3fhqw54ly0mcg-stage-1-init.sh  yigzsy207ivjagmj140x8rrixqmajiq7-initrd-kmod-blacklist-ubuntu