Re: [PATCH 3/3] domain: fix migration to older libvirt

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On 10/24/2016 08:41 AM, Pavel Hrdina wrote:
> Since TLS feature was introduced in libvirt 2.3.0 we have to modify

Since TLS was introduced hostwide for libvirt 2.3.0 and a domain
configurable haveTLS was implemented for libvirt 2.4.0, we have to
modify the

> migratable XML for specific case where 'tls' attribute is based on

s/where/where the/

> setting from qemu.conf.
> 
> Signed-off-by: Pavel Hrdina <phrdina@xxxxxxxxxx>
> ---
>  src/conf/domain_conf.c | 24 +++++++++++++++++++++++-
>  src/conf/domain_conf.h |  1 +
>  src/qemu/qemu_domain.c |  1 +
>  3 files changed, 25 insertions(+), 1 deletion(-)
> 


TBH this is ultimately very odd/confusing to read.  The "tlsFromConfig"
doesn't end up in the config XML right?  Just the migratable.

ACK since you've shown in the previous series that the permutations
work. Perhaps an extra word or two in the commit message regarding the
flag and how it's used will be helpful for the person who reads the code
once we've both (shortly) forgotten about it

John

> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
> index 6e814b3..f556e4c 100644
> --- a/src/conf/domain_conf.c
> +++ b/src/conf/domain_conf.c
> @@ -1999,6 +1999,7 @@ virDomainChrSourceDefCopy(virDomainChrSourceDefPtr dest,
>              return -1;
>  
>          dest->data.tcp.haveTLS = src->data.tcp.haveTLS;
> +        dest->data.tcp.tlsFromConfig = src->data.tcp.tlsFromConfig;
>          break;
>  
>      case VIR_DOMAIN_CHR_TYPE_UNIX:
> @@ -10042,6 +10043,7 @@ virDomainChrSourceDefParseXML(virDomainChrSourceDefPtr def,
>      char *slave = NULL;
>      char *append = NULL;
>      char *haveTLS = NULL;
> +    char *tlsFromConfig = NULL;
>      int remaining = 0;
>  
>      while (cur != NULL) {
> @@ -10051,6 +10053,8 @@ virDomainChrSourceDefParseXML(virDomainChrSourceDefPtr def,
>                      mode = virXMLPropString(cur, "mode");
>                  if (!haveTLS)
>                      haveTLS = virXMLPropString(cur, "tls");
> +                if (!tlsFromConfig)
> +                    tlsFromConfig = virXMLPropString(cur, "tlsFromConfig");
>  
>                  switch ((virDomainChrType) def->type) {
>                  case VIR_DOMAIN_CHR_TYPE_FILE:
> @@ -10236,6 +10240,18 @@ virDomainChrSourceDefParseXML(virDomainChrSourceDefPtr def,
>              goto error;
>          }
>  
> +        if (tlsFromConfig &&
> +            flags & VIR_DOMAIN_DEF_PARSE_STATUS) {
> +            int tmp;
> +            if (virStrToLong_i(tlsFromConfig, NULL, 10, &tmp) < 0) {
> +                virReportError(VIR_ERR_XML_ERROR,
> +                               _("Invalid tlsFromConfig value: %s"),
> +                               tlsFromConfig);
> +                goto error;
> +            }
> +            def->data.tcp.tlsFromConfig = !!tmp;
> +        }
> +
>          if (!protocol)
>              def->data.tcp.protocol = VIR_DOMAIN_CHR_TCP_PROTOCOL_RAW;
>          else if ((def->data.tcp.protocol =
> @@ -10321,6 +10337,7 @@ virDomainChrSourceDefParseXML(virDomainChrSourceDefPtr def,
>      VIR_FREE(logappend);
>      VIR_FREE(logfile);
>      VIR_FREE(haveTLS);
> +    VIR_FREE(tlsFromConfig);
>  
>      return remaining;
>  
> @@ -21508,9 +21525,14 @@ virDomainChrSourceDefFormat(virBufferPtr buf,
>                            def->data.tcp.listen ? "bind" : "connect");
>          virBufferEscapeString(buf, "host='%s' ", def->data.tcp.host);
>          virBufferEscapeString(buf, "service='%s'", def->data.tcp.service);
> -        if (def->data.tcp.haveTLS != VIR_TRISTATE_BOOL_ABSENT)
> +        if (def->data.tcp.haveTLS != VIR_TRISTATE_BOOL_ABSENT &&
> +            !(flags & VIR_DOMAIN_DEF_FORMAT_MIGRATABLE &&
> +              def->data.tcp.tlsFromConfig))
>              virBufferAsprintf(buf, " tls='%s'",
>                      virTristateBoolTypeToString(def->data.tcp.haveTLS));
> +        if (flags & VIR_DOMAIN_DEF_FORMAT_STATUS)
> +            virBufferAsprintf(buf, " tlsFromConfig='%d'",
> +                              def->data.tcp.tlsFromConfig);
>          virBufferAddLit(buf, "/>\n");
>  
>          virBufferAsprintf(buf, "<protocol type='%s'/>\n",
> diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
> index f1da9c3..dff28c0 100644
> --- a/src/conf/domain_conf.h
> +++ b/src/conf/domain_conf.h
> @@ -1096,6 +1096,7 @@ struct _virDomainChrSourceDef {
>              int protocol;
>              bool tlscreds;
>              int haveTLS; /* enum virTristateBool */
> +            bool tlsFromConfig;
>          } tcp;
>          struct {
>              char *bindHost;
> diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
> index 6cffff0..41ac52d 100644
> --- a/src/qemu/qemu_domain.c
> +++ b/src/qemu/qemu_domain.c
> @@ -6204,6 +6204,7 @@ qemuDomainPrepareChardevSourceTLS(virDomainChrSourceDefPtr source,
>                  source->data.tcp.haveTLS = VIR_TRISTATE_BOOL_YES;
>              else
>                  source->data.tcp.haveTLS = VIR_TRISTATE_BOOL_NO;
> +            source->data.tcp.tlsFromConfig = true;
>          }
>      }
>  }
> 

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