UPDATE as of 11/27/2025
Would you experience any issues with cachyos-rate-mirrors, just remind that cachyos-rate-mirrors is a wrapper script for the rate-mirrors tool, specifically configured to rank and update both Arch Linux and CachyOS mirrors for the user's mirror list file. It automatically tests available mirrors based on speed and synchronization status to ensure pacman downloads are optimized. It's a wrapper: It is not a replacement for rate-mirrors but rather a specific version or a script that uses rate-mirrors's underlying functionality. See man pages for rate-mirrors.
END UPDATE
Following below is procedure which allows to install on Arch Linux CachyOS v3 repositories along with pacman fork belongs to CachyOS. Proceed as advised in post on Arch Linux KVM Guest deployed via F43/42 KVM Hypervisor . Upgraded Arch Instances have successfully passed via `sudo pacman -Syyu` multiple times during several recent days. Re-sync of v3 repos and core && extra works pretty stable ( u,u^interrupted,sudo pacman -Syyu ) - the same commands as described in post after first reboot Arch VM into CachyOS kernel. I also have to confirm that Re-sync might be randomly required. The hack step below is scp cachyos-rate-mirrors script from remote native CachyOS Instance to the target one.
$ sudo pacman-key --init
$ sudo pacman-key --populate
$ sudo pacman-key --recv-keys F3B607488DB35A47 --keyserver keyserver.ubuntu.com
$ sudo pacman-key --lsign-key F3B607488DB35A47
$ curl https://mirror.cachyos.org/cachyos-repo.tar.xz -o cachyos-repo.tar.xz
$ tar xvf cachyos-repo.tar.xz && cd cachyos-repo
The step in particular installs pacman's fork belongs to CachyOS
$ sudo ./cachyos-repo.sh
$ cd
Scp binary cachyos-rate-mirrors from native CachyOS box to target one
$ vim .bashrc
Add at bottom of .bashrc function u() from [1]
u() {
sudo cachyos-rate-mirrors && yay --noconfirm
# Clear pacman cache completely (drops all cached packages, except last 3)
sudo paccache -rk3 <<< y
# Remove orphaned packages without prompt
sudo pacman -Rns $(pacman -Qtdq) --noconfirm || true
}
:wq
$ source ~/.bashrc
$ u
Right after successful u() completion install Cachyos kernel and reboot Arch Linux VM into CachyOS kernel
$ sudo pacman -S linux-cachyos linux-cachyos-headers
$ sudo grub-mkconfig -o /boot/grub/grub.cfg
$ sudo reboot
On Arch VM rebooted into Cachyos kernel
$ u
Run u() again and interrupt when message «Done [arch] /etc/pacman/mirrorlist» pops up and script is waiting for message «Ranking mirrors for cachyos repositories»
$ u <<and interrupt>>
Attempt to run `sudo pacman -Syyu` is supposed to perform final repositories synchronization .
Next step is running `yay -S pamac-aur` and perform another one preferences/refresh sync v3 repos, extra, core and AUR using Add/Remove programs interface.
Now make sure that pacman been installed on Arch Linux instance was a CachyOS pacman fork.
ssh boris@192.168.0.16
boris@192.168.0.16's password:
Permission denied, please try again.
boris@192.168.0.16's password:
╭───────────╮
/\ │ user │ boris
/ \ │ hname │ ArchTestify
/ \ │ uptime │ 53 mins
/ \ │ distro │ Arch Linux x86_64
/ ,, \ │ kernel │ Linux 6.17.5-2-cachyos
/ | | \ | wm │ KWin (Wayland)
/_-'' ''-_\ | desktop │ KDE Plasma 6.5.1
│ term │ /dev/pts/2
│ shell │ bash 5.3.3
│ cpu │ 8 x Intel(R) Xeon(R) E5-2690 v3 (8) @ 2.59 GHz
│ disk │ 13.47 GiB / 56.91 GiB (24%) - ext4
│ memory │ 3.23 GiB / 15.24 GiB (21%)
├───────────┤
│ colors │ ● ● ● ● ● ● ● ●
╰───────────╯
~
❯ sudo pacman -Syyu
[sudo] password for boris:
:: Synchronizing package databases...
cachyos-v3 136.4 KiB 300 KiB/s 00:00 [##################################################] 100%
cachyos-core-v3 101.1 KiB 88.2 KiB/s 00:01 [##################################################] 100%
cachyos-extra-v3 4.2 MiB 3.96 MiB/s 00:01 [##################################################] 100%
cachyos 506.8 KiB 810 KiB/s 00:01 [##################################################] 100%
core 117.4 KiB 284 KiB/s 00:00 [##################################################] 100%
extra 8.0 MiB 5.67 MiB/s 00:01 [##################################################] 100%
:: Starting full system upgrade...
warning: archlinux-keyring: local (20251027-3) is newer than cachyos (20251027-2)
there is nothing to do
~
❯ pacman -Qi pacman
Installed From : None
Name : pacman
Version : 7.0.0.r7.g1f38429-2
Description : A library-based package manager with dependency support. CachyOS fork.
Architecture : x86_64
URL : https://www.archlinux.org/pacman/
Licenses : GPL-2.0-or-later
Groups : None
Provides : libalpm.so=15-64
Depends On : bash coreutils curl libcurl.so=4-64 gawk gettext glibc gnupg gpgme libgpgme.so=45-64 grep libarchive
libarchive.so=13-64 openssl libcrypto.so=3-64 pacman-mirrorlist systemd
Optional Deps : base-devel: required to use makepkg [installed]
perl-locale-gettext: translation support in makepkg-template
Required By : appstream-glib archlinux-keyring base base-devel libpamac-aur pacman-contrib
Optional For : None
Conflicts With : None
Replaces : None
Installed Size : 10.04 MiB
Packager : CachyOS <admin@cachyos.org>
Build Date : Sun 19 Oct 2025 12:10:57 PM UTC
Install Date : Fri 31 Oct 2025 11:13:32 AM UTC
Install Reason : Installed as a dependency for another package
Install Script : No
Validated By : Signature
Thus KVM Hypervisor's packages would be installed from CachyOS *_v3 repositories as well as Hyprland with ML4W Dotfiles 2.9.9.3 packages installed via Dotfiles Installer 0.10.0. Both procedures were verified on Arch Linux upgraded virtual instances
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