pacsup: what would `pacman -Syu` upgrade?

pacsup

#!/bin/sh
# pacsup 0.1.0
# Copyright Hannu Hartikainen 2021
# MIT License

set -e

CACHE_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/pacsup"

if [ ! -d "$CACHE_DIR" ]; then
    mkdir -p "$CACHE_DIR"
    ln -s /var/lib/pacman/local "$CACHE_DIR"/local
fi

fakeroot -- pacman -Sy --dbpath "$CACHE_DIR" 1>&2
fakeroot -- pacman -Qu --dbpath "$CACHE_DIR"

sample_output.txt

$ pacsup
:: Synchronizing package databases...
 core is up to date
 extra is up to date
 community is up to date
 multilib is up to date
acpi_call 1.2.1-15 -> 1.2.1-16
ansible 2.10.4-2 -> 2.10.5-1
bbswitch 0.8-375 -> 0.8-376
broot 1.1.10-1 -> 1.1.11-1
chromium 87.0.4280.88-3 -> 87.0.4280.141-1
cups-filters 1.28.6-1 -> 1.28.7-1
haskell-aeson 1.5.5.0-2 -> 1.5.5.1-2
haskell-assoc 1.0.2-41 -> 1.0.2-42
haskell-attoparsec 0.13.2.4-50 -> 0.13.2.4-51
haskell-base-compat-batteries 0.11.2-37 -> 0.11.2-39
haskell-base-orphans 0.8.4-27 -> 0.8.4-29
haskell-bifunctors 5.5.8-49 -> 5.5.9-4
haskell-comonad 5.0.8-4 -> 5.0.8-6
haskell-data-fix 0.3.0-41 -> 0.3.0-42
haskell-distributive 0.6.2.1-5 -> 0.6.2.1-7
haskell-dlist 1.0-37 -> 1.0-38
haskell-hashable 1.3.0.0-63 -> 1.3.0.0-65
haskell-primitive 0.7.1.0-56 -> 0.7.1.0-58
haskell-quickcheck 2.14.2-53 -> 2.14.2-56
haskell-random 1.2.0-98 -> 1.2.0-102
haskell-scientific 0.3.6.2-67 -> 0.3.6.2-68
haskell-splitmix 0.1.0.3-32 -> 0.1.0.3-34
haskell-strict 0.4.0.1-15 -> 0.4.0.1-16
haskell-these 1.1.1.1-42 -> 1.1.1.1-43
haskell-time-compat 1.9.5-15 -> 1.9.5-16
haskell-unordered-containers 0.2.13.0-25 -> 0.2.13.0-26
haskell-uuid-types 1.0.3-72 -> 1.0.3-73
haskell-vector 0.12.1.2-96 -> 0.12.1.2-99
imagemagick 7.0.10.55-1 -> 7.0.10.56-1
linux 5.10.4.arch2-1 -> 5.10.5.arch1-1
linux-headers 5.10.4.arch2-1 -> 5.10.5.arch1-1
linux-lts 5.4.86-1 -> 5.4.87-1
nettle 3.6-1 -> 3.7-1
python-numpy 1.19.4-3 -> 1.19.5-1
qpdf 10.0.4-1 -> 10.1.0-1
shellcheck 0.7.1-234 -> 0.7.1-236
virtualbox-host-modules-arch 6.1.16-20 -> 6.1.16-21