[Bug 1744758] Re: libvirt 2.5.0-3ubuntu5.6~cloud0 appears to be compiled without gnutls

[ChristianEhrhardt]

This was created by:
https://libvirt.org/git/?p=libvirt.git;a=commit;h=680d2f49dad425395de627a31006cb84848cfa65

Which just is in 2.5 (that you have).
But there is an issue in that.
Later on fixed by several changes.
I had to parse through them for a while, but I think the following will fix your issue:

https://libvirt.org/git/?p=libvirt.git;a=commit;h=ba5d9dd4768f3d3d67d9eace7b6de27a2799f458
https://libvirt.org/git/?p=libvirt.git;a=commit;h=aac34eca90f37c4510b49ad85029c07c57bedb8d

That would make the detection work again fine, and due to that the feature be correctly handled again.
They apply to the last version in zesty with an offset of -4 and no complains otherwise.

This changes the .ac files, but d/rules calls --with autoreconf so I'd hope it rewrites that.
Can you give that a  try in a ppa Corey?

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https://bugs.launchpad.net/bugs/1744758

Title:
  libvirt 2.5.0-3ubuntu5.6~cloud0  appears to be compiled without gnutls

Status in Ubuntu Cloud Archive:
  New
Status in libvirt package in Ubuntu:
  Incomplete

Bug description:
  Currently seeing the following error in OpenStack CI on 16.04 with
  Libvirt 2.5.0 provided via the UCA when attempting to create a `luks`
  Libvirt secret:

  http://logs.openstack.org/50/536350/1/check/legacy-grenade-dsvm-
  neutron-multinode-live-
  migration/5f7ed57/logs/screen-n-cpu.txt.gz?level=ERROR#_Jan_22_15_09_28_467904

  ~~~
  libvirtError: unsupported configuration: luks encryption requires encrypted secrets to be supported
  ~~~

  This appears to be bubbling up due to the HAVE_GNUTLS_CIPHER_ENCRYPT
  macro being 0 in this build due to gnutls_cipher_encrypt being missing
  at build time :

  src/util/vircrypto.c

  102 virCryptoHaveCipher(virCryptoCipher algorithm)                                  
  103 {                                                                               
  104     switch (algorithm) {                                                        
  105                                                                                 
  106     case VIR_CRYPTO_CIPHER_AES256CBC:                                           
  107 #ifdef HAVE_GNUTLS_CIPHER_ENCRYPT                                               
  108     return true;                                                                
  109 #else                                                                           
  110     return false;                                                               
  111 #endif                                                                          
  112                                                                                 
  113     case VIR_CRYPTO_CIPHER_NONE:                                                
  114     case VIR_CRYPTO_CIPHER_LAST:                                                
  115         break;                                                                  
  116     };                                                                          
  117                                                                                 
  118     return false;                                                               
  119 }

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