gnupg on Arch Linux broken since readline upgrade - can't find libreadline.so.6
This has been reported to Arch here.
The workaround is to run
mkinitcpio -P
after the upgrade has completed, but before rebooting.
If you've rebooted before re-running mkinitcpio, then you'll need to boot off e.g. a USB key and run the mkinitcpio from the chroot. The easiest is to use arch-chroot as in the Arch install instructions.
I haven't had a chance to test this method in this particular case, however have done so in the past.
Fixed by manually verifying and installing an older version:
- Download the previous release from Arch Linux Archive
- Copy the package and signature file to another machine and verifying the signature there
- Unpack the package:
sudo tar -xvpf readline-6.3.008-4-x86_64.pkg.tar.xz -C / --exclude .PKGINFO --exclude .INSTALL
Warning: Other packages may contain pre- or post-install scripts. This one did not, but consider yourself warned!
It seems libreadline.so.7 is backward compatible enough for most utilities to keep working after running:
sudo ln -s /usr/lib/libreadline.so.7 /usr/lib/libreadline.so.6
After that it warned me that /usr/bin/bash: Symbol rl_readline_state has different size in shared object, consider re-linking, but I was able to update pacman-key and upgrade libgcrypt so that new packages would validate, and then pacman -S bash to rebuild my shell using readline 7.0.
After you've put out pacman's Catch-22-style fires, simply clean up with:
sudo rm /usr/lib/libreadline.so.6