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vz: acquire a pidfile in the driver root directory
When we allow multiple instances of the driver for the same user account, using a separate root directory, we need to ensure mutual exclusion. Use a pidfile to guarantee this. In privileged libvirtd this ends up locking /var/run/libvirt/vz/driver.pid In unprivileged libvirtd this ends up locking /run/user/$UID/libvirt/vz/run/driver.pid NB, the latter can vary depending on $XDG_RUNTIME_DIR Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
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@ -41,6 +41,7 @@
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#include "vircommand.h"
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#include "configmake.h"
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#include "virfile.h"
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#include "virpidfile.h"
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#include "virstoragefile.h"
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#include "virstring.h"
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#include "cpu/cpu.h"
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@ -59,8 +60,13 @@ VIR_LOG_INIT("parallels.parallels_driver");
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#define PRLCTL "prlctl"
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#define VZ_STATEDIR LOCALSTATEDIR "/run/libvirt/vz"
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static virClassPtr vzDriverClass;
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static bool vz_driver_privileged;
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/* pid file FD, ensures two copies of the driver can't use the same root */
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static int vz_driver_lock_fd = -1;
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static virMutex vz_driver_lock;
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static vzDriverPtr vz_driver;
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static vzConnPtr vz_conn_list;
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@ -166,6 +172,11 @@ VIR_ONCE_GLOBAL_INIT(vzDriver);
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vzDriverPtr
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vzGetDriverConnection(void)
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{
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if (!vz_driver_privileged) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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"%s", _("vz state driver is not active"));
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return NULL;
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}
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virMutexLock(&vz_driver_lock);
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if (!vz_driver)
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vz_driver = vzDriverObjNew();
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@ -4090,18 +4101,37 @@ static virConnectDriver vzConnectDriver = {
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static int
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vzStateCleanup(void)
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{
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virObjectUnref(vz_driver);
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vz_driver = NULL;
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virMutexDestroy(&vz_driver_lock);
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prlsdkDeinit();
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if (vz_driver_privileged) {
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virObjectUnref(vz_driver);
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vz_driver = NULL;
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if (vz_driver_lock_fd != -1)
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virPidFileRelease(VZ_STATEDIR, "driver", vz_driver_lock_fd);
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virMutexDestroy(&vz_driver_lock);
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prlsdkDeinit();
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}
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return 0;
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}
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static int
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vzStateInitialize(bool privileged ATTRIBUTE_UNUSED,
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vzStateInitialize(bool privileged,
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virStateInhibitCallback callback ATTRIBUTE_UNUSED,
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void *opaque ATTRIBUTE_UNUSED)
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{
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if (!privileged)
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return 0;
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vz_driver_privileged = privileged;
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if (virFileMakePathWithMode(VZ_STATEDIR, S_IRWXU) < 0) {
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virReportSystemError(errno, _("cannot create state directory '%s'"),
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VZ_STATEDIR);
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return -1;
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}
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if ((vz_driver_lock_fd =
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virPidFileAcquire(VZ_STATEDIR, "driver", true, getpid())) < 0)
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return -1;
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if (prlsdkInit() < 0) {
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VIR_DEBUG("%s", _("Can't initialize Parallels SDK"));
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return -1;
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