[PATCH 17/26] conf: implement support for autostart once feature

[Daniel P. Berrangé <berrange@xxxxxxxxxx>]

This is maintained in the same way as the autostart flag, using a
symlink. The difference is that instead of '.xml', the symlink
suffix is '.xml.once'. The link is also deleted immediately after
it has been read.

Signed-off-by: Daniel P. Berrangé <berrange@xxxxxxxxxx>
---
 src/conf/domain_conf.c      | 6 +++++-
 src/conf/domain_conf.h      | 1 +
 src/conf/virdomainobjlist.c | 7 ++++++-
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index af88d0bcfd..4a794d1f71 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -29083,13 +29083,17 @@ virDomainDeleteConfig(const char *configDir,
 {
     g_autofree char *configFile = NULL;
     g_autofree char *autostartLink = NULL;
+    g_autofree char *autostartOnceLink = NULL;
 
     configFile = virDomainConfigFile(configDir, dom->def->name);
     autostartLink = virDomainConfigFile(autostartDir, dom->def->name);
+    autostartOnceLink = g_strdup_printf("%s.once", autostartLink);
 
-    /* Not fatal if this doesn't work */
+    /* Not fatal if these don't work */
     unlink(autostartLink);
+    unlink(autostartOnceLink);
     dom->autostart = 0;
+    dom->autostartOnce = 0;
 
     if (unlink(configFile) < 0 &&
         errno != ENOENT) {
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 9f7c28343f..f30143e704 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -3282,6 +3282,7 @@ struct _virDomainObj {
     virDomainStateReason state;
 
     unsigned int autostart : 1;
+    unsigned int autostartOnce : 1;
     unsigned int persistent : 1;
     unsigned int updated : 1;
     unsigned int removing : 1;
diff --git a/src/conf/virdomainobjlist.c b/src/conf/virdomainobjlist.c
index 72207450c5..ba2f9f544d 100644
--- a/src/conf/virdomainobjlist.c
+++ b/src/conf/virdomainobjlist.c
@@ -487,9 +487,10 @@ virDomainObjListLoadConfig(virDomainObjList *doms,
 {
     g_autofree char *configFile = NULL;
     g_autofree char *autostartLink = NULL;
+    g_autofree char *autostartOnceLink = NULL;
     g_autoptr(virDomainDef) def = NULL;
     virDomainObj *dom;
-    int autostart;
+    int autostart, autostartOnce;
     g_autoptr(virDomainDef) oldDef = NULL;
 
     configFile = virDomainConfigFile(configDir, name);
@@ -500,13 +501,17 @@ virDomainObjListLoadConfig(virDomainObjList *doms,
         return NULL;
 
     autostartLink = virDomainConfigFile(autostartDir, name);
+    autostartOnceLink = g_strdup_printf("%s.once", autostartLink);
 
     autostart = virFileLinkPointsTo(autostartLink, configFile);
+    autostartOnce = virFileLinkPointsTo(autostartOnceLink, configFile);
+    unlink(autostartOnceLink);
 
     if (!(dom = virDomainObjListAddLocked(doms, &def, xmlopt, 0, &oldDef)))
         return NULL;
 
     dom->autostart = autostart;
+    dom->autostartOnce = autostartOnce;
 
     if (notify)
         (*notify)(dom, oldDef == NULL, opaque);
-- 
2.47.1