Some of objects we manage can be autostarted on libvirtd startup (e.g. domains, network, storage pools). The idea was that when the host is started up these objects are started too without need of user intervention. However, with the latest daemon split and switch to socket activated, short lived daemons (we put --timeout 120 onto each daemon's command line) this doesn't do what we want it to. The problem is not new though, we already had the session daemon come and go and we circumvented this problem by documenting it (see v4.10.0-92-g61b4e8aaf1). But now that we meet the same problem at all fronts it's time to deal with it. The solution implemented in this commit is to have a file (one per each driver) that: 1) if doesn't exist, is created and autostart is allowed for given driver, 2) if it does exist, then autostart is suppressed for given driver. All the files live in a location that doesn't survive host reboots (/var/run/ for instance) and thus the file is automatically not there on fresh host boot. Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx> --- src/driver.c | 39 +++++++++++++++++++++++++++++++++++++++ src/driver.h | 3 +++ src/libvirt_private.syms | 1 + 3 files changed, 43 insertions(+) diff --git a/src/driver.c b/src/driver.c index ed2d943ddf..305c4c624b 100644 --- a/src/driver.c +++ b/src/driver.c @@ -29,6 +29,7 @@ #include "virfile.h" #include "virlog.h" #include "virmodule.h" +#include "virstring.h" #include "virthread.h" #include "configmake.h" @@ -69,6 +70,44 @@ virDriverLoadModule(const char *name, /* XXX unload modules, but we can't until we can unregister libvirt drivers */ +/** + * virDriverShouldAutostart: + * @dir: driver's run state directory (usually /var/run/libvirt/$driver) + * @autostart: whether driver should initiate autostart + * + * Automatic starting of libvirt's objects (e.g. domains, networks, storage + * pools, etc.) doesn't play nice with using '--timeout' on daemon's command + * line because the objects are attempted to autostart on every start of + * corresponding driver/daemon. To resolve this problem, a file is created in + * driver's private directory (which doesn't survive host's reboot) and thus + * autostart is attempted only once. + */ +int +virDriverShouldAutostart(const char *dir, + bool *autostart) +{ + VIR_AUTOFREE(char *) path = NULL; + + *autostart = false; + + if (virAsprintf(&path, "%s/autostarted", dir) < 0) + return -1; + + if (virFileExists(path)) { + VIR_DEBUG("Autostart file %s exists, skipping autostart", path); + return 0; + } + + VIR_DEBUG("Autostart file %s does not exist, do autostart", path); + *autostart = true; + + if (virFileTouch(path, 0600) < 0) + return -1; + + return 0; +} + + virThreadLocal connectInterface; virThreadLocal connectNetwork; virThreadLocal connectNWFilter; diff --git a/src/driver.h b/src/driver.h index 68c0004d86..faf4788a4f 100644 --- a/src/driver.h +++ b/src/driver.h @@ -114,6 +114,9 @@ int virDriverLoadModule(const char *name, const char *regfunc, bool required); +int virDriverShouldAutostart(const char *name, + bool *autostart); + virConnectPtr virGetConnectInterface(void); virConnectPtr virGetConnectNetwork(void); virConnectPtr virGetConnectNWFilter(void); diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index eeab820eca..c818bc807a 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -1346,6 +1346,7 @@ virStreamClass; # driver.h virConnectValidateURIPath; +virDriverShouldAutostart; virGetConnectInterface; virGetConnectNetwork; virGetConnectNodeDev; -- 2.21.0 -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list