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From 7a081e92617f2f05e9ef29d3eb65b557e7375815 Mon Sep 17 00:00:00 2001
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Message-Id: <7a081e92617f2f05e9ef29d3eb65b557e7375815@dist-git>
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From: Michal Privoznik <mprivozn@redhat.com>
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Date: Mon, 6 Mar 2017 16:20:57 +0100
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Subject: [PATCH] qemu: Allow empty script path to <interface/>
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RHEL-7.4: https://bugzilla.redhat.com/show_bug.cgi?id=1412834
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RHEL-7.3.z: https://bugzilla.redhat.com/show_bug.cgi?id=1429510
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Before 9c17d665fdc5f (v1.3.2 - I know, right?) it was possible to
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have the following interface configuration:
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  <interface type='ethernet'/>
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    <script path=''/>
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  </interface>
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This resulted in -netdev tap,script=,.. Fortunately, qemu helped
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us to get away with this as it just ignored the empty script
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path. However, after the commit mentioned above it's libvirtd
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who is executing the script. Unfortunately without special
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case-ing empty script path.
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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(cherry picked from commit 1d9ab0f04af310e52f80b4281751655bb3bb7601)
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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---
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 src/util/virnetdev.c | 4 ++++
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 1 file changed, 4 insertions(+)
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diff --git a/src/util/virnetdev.c b/src/util/virnetdev.c
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index fa695d4a6..d12324878 100644
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--- a/src/util/virnetdev.c
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+++ b/src/util/virnetdev.c
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@@ -2615,6 +2615,10 @@ virNetDevRunEthernetScript(const char *ifname, const char *script)
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     virCommandPtr cmd;
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     int ret;
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+    /* Not a bug! Previously we did accept script="" as a NO-OP. */
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+    if (STREQ(script, ""))
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+        return 0;
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+
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     cmd = virCommandNew(script);
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     virCommandAddArgFormat(cmd, "%s", ifname);
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     virCommandClearCaps(cmd);
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-- 
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2.12.0
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