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From 37b470d6e99ba9468054ae20524ed00014e6e0bb Mon Sep 17 00:00:00 2001
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Message-Id: <37b470d6e99ba9468054ae20524ed00014e6e0bb@dist-git>
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From: Michal Privoznik <mprivozn@redhat.com>
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Date: Tue, 4 Sep 2018 10:38:49 +0200
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Subject: [PATCH] virDomainDetachDeviceFlags: Clarify update semantics
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RHEL-7.6: https://bugzilla.redhat.com/show_bug.cgi?id=1621910
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RHEL-8.0: https://bugzilla.redhat.com/show_bug.cgi?id=1603133
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When users want to update a path to a CDROM they tend to
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construct a very minimal XML and feed the API with it. This is
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not a good practice as it breaks the assumptions the API is built
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on. Most notably, leaving an element out should be treated as a
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request for removal of the corresponding setting. Just like
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leaving out <bandwidth/> clears out any QoS previously set.
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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Reviewed-by: Erik Skultety <eskultet@redhat.com>
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(cherry picked from commit 2864b4cd1ccda9c12f0c0ceb340836c42a2a0e52)
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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---
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src/libvirt-domain.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
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index ab7266dc19..ad0ded9ee3 100644
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--- a/src/libvirt-domain.c
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+++ b/src/libvirt-domain.c
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@@ -8315,6 +8315,14 @@ virDomainDetachDeviceFlags(virDomainPtr domain,
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* media, altering the graphics configuration such as password,
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* reconfiguring the NIC device backend connectivity, etc.
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*
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+ * The supplied XML description of the device should contain all
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+ * the information that is found in the corresponding domain XML.
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+ * Leaving out any piece of information may be treated as a
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+ * request for its removal, which may be denied. For instance,
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+ * when users want to change CDROM media only for live XML, they
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+ * must provide live disk XML as found in the corresponding live
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+ * domain XML with only the disk path changed.
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+ *
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* Returns 0 in case of success, -1 in case of failure.
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*/
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int
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--
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2.18.0
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