[PATCH] Set the 'container_ttys' env variable for LXC consoles

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

From: "Daniel P. Berrange" <berrange@xxxxxxxxxx>

Systemd specified that any /dev/pts/NNN device on which it
is expected to spawn a agetty login, should be listed in
the 'container_ttys' env variable. It should just contain
the relative paths, eg 'pts/0' not '/dev/pts/0' and should
be space separated.

http://cgit.freedesktop.org/systemd/systemd/commit/?id=1d97ff7dd71902a5604c2fed8964925d54e09de9

Signed-off-by: Daniel P. Berrange <berrange@xxxxxxxxxx>
---
 src/lxc/lxc_container.c | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
index 51fa1b3..f0b526f 100644
--- a/src/lxc/lxc_container.c
+++ b/src/lxc/lxc_container.c
@@ -196,10 +196,30 @@ int lxcContainerHasReboot(void)
  *
  * Returns a virCommandPtr
  */
-static virCommandPtr lxcContainerBuildInitCmd(virDomainDefPtr vmDef)
+static virCommandPtr lxcContainerBuildInitCmd(virDomainDefPtr vmDef,
+                                              char **ttyPaths,
+                                              size_t nttyPaths)
 {
     char uuidstr[VIR_UUID_STRING_BUFLEN];
     virCommandPtr cmd;
+    virBuffer buf = VIR_BUFFER_INITIALIZER;
+    size_t i;
+
+    for (i = 0 ; i < nttyPaths ; i++) {
+        if (!STRPREFIX(ttyPaths[0], "/dev/")) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("Expected a /dev path for '%s'"),
+                           ttyPaths[0]);
+            virBufferFreeAndReset(&buf);
+            return NULL;
+        }
+        if (i)
+            virBufferAddLit(&buf, " ");
+        virBufferAdd(&buf, ttyPaths[i] + 5, -1);
+    }
+
+    if (virBufferError(&buf))
+        return NULL;
 
     virUUIDFormat(vmDef->uuid, uuidstr);
 
@@ -214,9 +234,11 @@ static virCommandPtr lxcContainerBuildInitCmd(virDomainDefPtr vmDef)
     virCommandAddEnvPair(cmd, "container_uuid", uuidstr);
     virCommandAddEnvPair(cmd, "LIBVIRT_LXC_UUID", uuidstr);
     virCommandAddEnvPair(cmd, "LIBVIRT_LXC_NAME", vmDef->name);
+    virCommandAddEnvPair(cmd, "container_ttys", virBufferCurrentContent(&buf));
     if (vmDef->os.cmdline)
         virCommandAddEnvPair(cmd, "LIBVIRT_LXC_CMDLINE", vmDef->os.cmdline);
 
+    virBufferFreeAndReset(&buf);
     return cmd;
 }
 
@@ -1789,7 +1811,9 @@ static int lxcContainerChild(void *data)
     if ((hasReboot = lxcContainerHasReboot()) < 0)
         goto cleanup;
 
-    cmd = lxcContainerBuildInitCmd(vmDef);
+    cmd = lxcContainerBuildInitCmd(vmDef,
+                                   argv->ttyPaths,
+                                   argv->nttyPaths);
     virCommandWriteArgLog(cmd, 1);
 
     if (lxcContainerSetID(vmDef) < 0)
-- 
1.8.3.1

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