[PATCH] qemu:lxc:xml:libxl:xen: improve the error in openconsole/channel

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We allow do not pass the dev_name to openconsole() and openchannel()
function, but the error message is not good when we do not specified
the console/channel name.

the error message after this patch:
error: internal error: character device serial0 is not using a PTY

Signed-off-by: Luyao Huang <lhuang@xxxxxxxxxx>
---
 src/libxl/libxl_driver.c | 4 ++--
 src/lxc/lxc_driver.c     | 3 ++-
 src/qemu/qemu_driver.c   | 8 ++++----
 src/uml/uml_driver.c     | 3 ++-
 src/xen/xen_driver.c     | 3 ++-
 5 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index a7be745..c64d9be 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -4292,14 +4292,14 @@ libxlDomainOpenConsole(virDomainPtr dom,
     if (!chr) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("cannot find character device %s"),
-                       NULLSTR(dev_name));
+                       dev_name ? dev_name : "to open");
         goto cleanup;
     }
 
     if (chr->source.type != VIR_DOMAIN_CHR_TYPE_PTY) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("character device %s is not using a PTY"),
-                       NULLSTR(dev_name));
+                       dev_name ? dev_name : NULLSTR(chr->info.alias));
         goto cleanup;
     }
 
diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
index 31fb470..cc1277b 100644
--- a/src/lxc/lxc_driver.c
+++ b/src/lxc/lxc_driver.c
@@ -3484,7 +3484,8 @@ lxcDomainOpenConsole(virDomainPtr dom,
 
     if (chr->source.type != VIR_DOMAIN_CHR_TYPE_PTY) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
-                       _("character device %s is not using a PTY"), dev_name);
+                       _("character device %s is not using a PTY"),
+                       dev_name ? dev_name : NULLSTR(chr->info.alias));
         goto cleanup;
     }
 
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 6bb8549..282b32f 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -16041,14 +16041,14 @@ qemuDomainOpenConsole(virDomainPtr dom,
     if (!chr) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("cannot find character device %s"),
-                       NULLSTR(dev_name));
+                       dev_name ? dev_name : "to open");
         goto cleanup;
     }
 
     if (chr->source.type != VIR_DOMAIN_CHR_TYPE_PTY) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("character device %s is not using a PTY"),
-                       NULLSTR(dev_name));
+                       dev_name ? dev_name : NULLSTR(chr->info.alias));
         goto cleanup;
     }
 
@@ -16115,14 +16115,14 @@ qemuDomainOpenChannel(virDomainPtr dom,
     if (!chr) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("cannot find channel %s"),
-                       NULLSTR(name));
+                       name ? name : "to open");
         goto cleanup;
     }
 
     if (chr->source.type != VIR_DOMAIN_CHR_TYPE_UNIX) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("channel %s is not using a UNIX socket"),
-                       NULLSTR(name));
+                       name ? name : NULLSTR(chr->info.alias));
         goto cleanup;
     }
 
diff --git a/src/uml/uml_driver.c b/src/uml/uml_driver.c
index f09e79b..7a95458 100644
--- a/src/uml/uml_driver.c
+++ b/src/uml/uml_driver.c
@@ -2640,7 +2640,8 @@ umlDomainOpenConsole(virDomainPtr dom,
 
     if (chr->source.type != VIR_DOMAIN_CHR_TYPE_PTY) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
-                        _("character device %s is not using a PTY"), dev_name);
+                        _("character device %s is not using a PTY"),
+                       dev_name ? dev_name : NULLSTR(chr->info.alias));
         goto cleanup;
     }
 
diff --git a/src/xen/xen_driver.c b/src/xen/xen_driver.c
index da9e6f4..ce31f0f 100644
--- a/src/xen/xen_driver.c
+++ b/src/xen/xen_driver.c
@@ -2705,7 +2705,8 @@ xenUnifiedDomainOpenConsole(virDomainPtr dom,
 
     if (chr->source.type != VIR_DOMAIN_CHR_TYPE_PTY) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
-                       _("character device %s is not using a PTY"), dev_name);
+                       _("character device %s is not using a PTY"),
+                       dev_name ? dev_name : NULLSTR(chr->info.alias));
         goto cleanup;
     }
 
-- 
1.8.3.1

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