Re: [PATCH] rpc: virnetlibsshsession: update deprecated functions

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On Fri, Jun 21, 2019 at 09:56:37AM +0200, Peter Krempa wrote:
> On Fri, Jun 21, 2019 at 09:30:36 +0200, Pavel Hrdina wrote:
> > In libssh 0.9.0 functions ssh_is_server_known and ssh_write_knownhost
> > are marked as deprecated.
> > 
> > Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1722735
> > 
> > Signed-off-by: Pavel Hrdina <phrdina@xxxxxxxxxx>
> > ---
> >  m4/virt-libssh.m4             | 8 ++++++++
> >  src/rpc/virnetlibsshsession.c | 4 ++--
> >  2 files changed, 10 insertions(+), 2 deletions(-)
> > 
> > diff --git a/m4/virt-libssh.m4 b/m4/virt-libssh.m4
> > index 01c3b75c72..132447da16 100644
> > --- a/m4/virt-libssh.m4
> > +++ b/m4/virt-libssh.m4
> > @@ -33,6 +33,14 @@ AC_DEFUN([LIBVIRT_CHECK_LIBSSH],[
> >        [],
> >        [AC_DEFINE_UNQUOTED([ssh_get_server_publickey], [ssh_get_publickey],
> >              [ssh_get_publickey is deprecated and replaced by ssh_get_server_publickey.])])
> > +    AC_CHECK_FUNC([ssh_session_is_known_server],
> > +      [],
> > +      [AC_DEFINE_UNQUOTED([ssh_session_is_known_server], [ssh_is_server_known],
> > +            [ssh_is_server_known is deprecated and replaced by ssh_session_is_known_server.])])
> > +    AC_CHECK_FUNC([ssh_session_update_known_hosts],
> > +      [],
> > +      [AC_DEFINE_UNQUOTED([ssh_session_update_known_hosts], [ssh_write_knownhost],
> > +            [ssh_write_knownhost is deprecated and replaced by ssh_session_update_known_hosts.])])
> >      CFLAGS="$old_CFLAGS"
> >      LIBS="$old_LIBS"
> 
> I'm not entirely a fan of this. I'd probably prefer defining a macro ...
> 
> >    fi
> > diff --git a/src/rpc/virnetlibsshsession.c b/src/rpc/virnetlibsshsession.c
> > index 486437e7bf..093ac29071 100644
> > --- a/src/rpc/virnetlibsshsession.c
> > +++ b/src/rpc/virnetlibsshsession.c
> > @@ -284,7 +284,7 @@ virNetLibsshCheckHostKey(virNetLibsshSessionPtr sess)
> >      if (sess->hostKeyVerify == VIR_NET_LIBSSH_HOSTKEY_VERIFY_IGNORE)
> >          return 0;
> 
> ...  which would select both the old and new impl here:
> 
> #if defined HAS_NEW_LIBSSH
>     state = ssh_session_is_known_server(sess->session);
> #else
> -    state = ssh_is_server_known(sess->session);
> #endif
> 
> This makes it shady and obscure.

Solid point, I've already pushed it so we can fix it as follow-up
together with the preexisting ssh_get_server_publickey.

I checked that the only other case where we follow this logic is to
workaround gnulib and kerberos symbol clash.

Pavel

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