guix shell --container and host guix daemon

Terminal 1

### Pass only daemon-socket

bash-5.1$ guix shell -CNP --share=/var/guix/daemon-socket guix busybox
tosh@universe /tmp/tmp.EfI1Syh6ug [env]$ readlink -f ~/.guix-profile
/gnu/store/xp975nkjikb5gzdh45ig1kh9qddcrvlv-profile
tosh@universe /tmp/tmp.EfI1Syh6ug [env]$ guix package -I
tosh@universe /tmp/tmp.EfI1Syh6ug [env]$ guix package -i hello
guix package: warning: Consider running 'guix pull' followed by
'guix package -u' to get up-to-date packages and security updates.

The following package will be installed:
   hello 2.10

tosh@universe /tmp/tmp.EfI1Syh6ug [env]$ hello
sh: hello: command not found
tosh@universe /tmp/tmp.EfI1Syh6ug [env]$ which hello
tosh@universe /tmp/tmp.EfI1Syh6ug [env]$ exit


### Pass whole /var/guix, *breaks* user's default profile

bash-5.1$ guix shell -CNP --share=/var/guix guix busybox
tosh@universe /tmp/tmp.EfI1Syh6ug [env]$ readlink -f ~/.guix-profile
/gnu/store/xp975nkjikb5gzdh45ig1kh9qddcrvlv-profile
tosh@universe /tmp/tmp.EfI1Syh6ug [env]$ guix package -I
tosh@universe /tmp/tmp.EfI1Syh6ug [env]$ guix package -i hello
guix package: warning: Consider running 'guix pull' followed by
'guix package -u' to get up-to-date packages and security updates.

The following package will be installed:
   hello 2.10

tosh@universe /tmp/tmp.EfI1Syh6ug [env]$ date
Tue Jan 18 01:19:03 UTC 2022
tosh@universe /tmp/tmp.EfI1Syh6ug [env]$ guix package -I
tosh@universe /tmp/tmp.EfI1Syh6ug [env]$ hello
sh: hello: command not found
tosh@universe /tmp/tmp.EfI1Syh6ug [env]$ which hello 
tosh@universe /tmp/tmp.EfI1Syh6ug [env]$ exit
bash-5.1$ 
exit

Terminal 2

### Before invoking `guix install` with whole /var/guix

bash-5.1$ readlink -f ~/.guix-profile
/gnu/store/yps9dg1x0vbj13pv2lpaqic702227k7c-profile


### After invoking `guix install` with whole /var/guix

bash-5.1$ readlink -f ~/.guix-profile
/gnu/store/pn0vwl8prdwzdpz4iij9j26nc9p4pafx-profile
bash-5.1$ date
Tue Jan 18 01:19:06 UTC 2022
exit