Sorry, but with this information it would be just a guess: https://www.hyperbola.info/groups/i686/base/
base is an existing group and therefore to be found within the repositories. And bash-shcompat (https://www.hyperbola.info/packages/cor … -shcompat/) is part of the ISO-image, so it is surely installed. Have you made the control having an online-connection?
Because ...
core is up to date
extra is up to date
Is slightly showing that pacstrap as command is not going the normal way as it should get information from a mirror. If you are installing in the way before with the ISO-image from disk, again the recommendation: Please use a disk connected to your computer through USB or any optical medium created (likewise DVD) at best.
Have you checked your /etc/pacman.conf and /etc/pacman.d/mirrorlist?
Human being in favor with clear principles and so also for freedom in soft- and hardware!
Certainly anyone who has the power to make you believe absurdities has the power to make you commit injustices: For a life of every being full with peace and kindness, including diversity and freedom. Capitalism is destroying our minds, the planet itself and the universe in the end!