[libvirt] [PATCH v3] qemu: fix broken autostart symlink after renaming domain.

[Julio Faracco]

If a domain is configured to start on boot, it has a symlink to the
domain definition inside the autostart directory. If you rename this
domain, the definition is renamed too. The symlink need to be pointed to
this renamed file. This commit recreates the symlink after renaming the
XML file.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1594985

Signed-off-by: Julio Faracco <jcfaracco at gmail.com>
---
 src/qemu/qemu_driver.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 8fae46370e..6bbea324b9 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -20914,6 +20914,8 @@ qemuDomainRenameCallback(virDomainObjPtr vm,
     char *old_dom_name = NULL;
     char *new_dom_cfg_file = NULL;
     char *old_dom_cfg_file = NULL;
+    char *new_dom_autostart_link = NULL;
+    char *old_dom_autostart_link = NULL;
 
     virCheckFlags(0, ret);
 
@@ -20934,6 +20936,22 @@ qemuDomainRenameCallback(virDomainObjPtr vm,
                                                  vm->def->name)))
         goto cleanup;
 
+    if (vm->autostart) {
+        if (!(new_dom_autostart_link = virDomainConfigFile(cfg->autostartDir,
+                                                          new_dom_name)) ||
+            !(old_dom_autostart_link = virDomainConfigFile(cfg->autostartDir,
+                                                          vm->def->name)))
+            goto cleanup;
+
+        if (virFileIsLink(old_dom_autostart_link) &&
+            unlink(old_dom_autostart_link) < 0) {
+            virReportSystemError(errno,
+                                 _("Failed to delete symlink '%s'"),
+                                 old_dom_autostart_link);
+            goto cleanup;
+        }
+    }
+
     event_old = virDomainEventLifecycleNewFromObj(vm,
                                             VIR_DOMAIN_EVENT_UNDEFINED,
                                             VIR_DOMAIN_EVENT_UNDEFINED_RENAMED);
@@ -20946,6 +20964,16 @@ qemuDomainRenameCallback(virDomainObjPtr vm,
     if (virDomainSaveConfig(cfg->configDir, driver->caps, vm->def) < 0)
         goto rollback;
 
+
+    if (vm->autostart) {
+        if (symlink(new_dom_cfg_file, new_dom_autostart_link) < 0) {
+            virReportSystemError(errno,
+                                 _("Failed to create symlink '%s to '%s'"),
+                                 new_dom_autostart_link, new_dom_cfg_file);
+            goto rollback;
+        }
+    }
+
     if (virFileExists(old_dom_cfg_file) &&
         unlink(old_dom_cfg_file) < 0) {
         virReportSystemError(errno,
@@ -20960,6 +20988,8 @@ qemuDomainRenameCallback(virDomainObjPtr vm,
     ret = 0;
 
  cleanup:
+    VIR_FREE(old_dom_autostart_link);
+    VIR_FREE(new_dom_autostart_link);
     VIR_FREE(old_dom_cfg_file);
     VIR_FREE(new_dom_cfg_file);
     VIR_FREE(old_dom_name);
@@ -20979,6 +21009,18 @@ qemuDomainRenameCallback(virDomainObjPtr vm,
     if (virFileExists(new_dom_cfg_file))
         unlink(new_dom_cfg_file);
 
+    if (vm->autostart) {
+        if (virFileExists(new_dom_autostart_link))
+            unlink(new_dom_autostart_link);
+
+        if (!virFileExists(old_dom_autostart_link) &&
+            symlink(old_dom_cfg_file, old_dom_autostart_link) < 0) {
+            virReportSystemError(errno,
+                                 _("Failed to create symlink '%s to '%s'"),
+                                 old_dom_autostart_link, old_dom_cfg_file);
+        }
+    }
+
     goto cleanup;
 }
 
-- 
2.17.1