[arch-general] libgcrypt.so.20 missing

[guns]

On Mon 13 Jan 2014 at 08:08:47PM +0100, Thomas Bächler wrote:
> Am 13.01.2014 19:33, schrieb Mark E. Lee:
>
> > I had three issues when trying to solve this problem:
> > 1) the mirror I was using wasn't up to date (still had
> > libgcrypt-1.5.3-1)
>
> You see, that is impossible. The package database contains either both
> the old pth and old libgcrypt, or both the new pth and new libgcrypt.

Regardless of whether this should be impossible, I have the same problem
as OP:

core/libgcrypt 1.5.3-1 [installed]
    General purpose cryptographic library based on the code from GnuPG
core/gnupg 2.0.22-2 [installed: 2.0.22-1]
    Complete and free implementation of the OpenPGP standard
core/cryptsetup 1.6.3-2 (base) [installed]
    Userspace setup tool for transparent encryption of block devices using dm-crypt

Note that the versions of gnupg and cryptsetup above are linked against
libgcrypt.so.20, which is not provided by 1.5.3-1. (I had to downgrade
gnupg to write this message).

> > 3) Failure to update libgcrypt before other packages resulted in a
> > kernel that seemed to be hung at booting.
>
> Sorry, I can't see how that would be related in any way.

This happens if a user has the `encrypt` hook set in their
mkinitcpio.conf, but their /usr/lib/libcryptsetup.so is linked against
a libgcrypt that they do not yet have:

[2014-01-13 12:59] [ALPM-SCRIPTLET] >>> Updating module dependencies. Please wait ...
[2014-01-13 12:59] [ALPM-SCRIPTLET] >>> Generating initial ramdisk, using mkinitcpio.  Please wait...
[2014-01-13 12:59] [ALPM-SCRIPTLET] ==> Building image from preset: /etc/mkinitcpio.d/linux.preset: 'default'
[2014-01-13 12:59] [ALPM-SCRIPTLET]   -> -k /boot/vmlinuz-linux -c /etc/mkinitcpio.conf -g /boot/initramfs-linux.img
[2014-01-13 12:59] [ALPM-SCRIPTLET] ==> Starting build: 3.12.7-2-ARCH
[2014-01-13 12:59] [ALPM-SCRIPTLET]   -> Running build hook: [base]
[2014-01-13 12:59] [ALPM-SCRIPTLET]   -> Running build hook: [udev]
[2014-01-13 12:59] [ALPM-SCRIPTLET]   -> Running build hook: [autodetect]
[2014-01-13 12:59] [ALPM-SCRIPTLET]   -> Running build hook: [modconf]
[2014-01-13 12:59] [ALPM-SCRIPTLET]   -> Running build hook: [block]
[2014-01-13 12:59] [ALPM-SCRIPTLET]   -> Running build hook: [keyboard]
[2014-01-13 12:59] [ALPM-SCRIPTLET]   -> Running build hook: [encrypt]
[2014-01-13 12:59] [ALPM-SCRIPTLET] ==> ERROR: binary dependency `libgcrypt.so.20' not found for `cryptsetup'

    guns
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