[Libvir] PATCH: Create a logfile for each QEMU vm
Daniel P. Berrange
berrange at redhat.com
Tue May 15 17:37:40 UTC 2007
On Tue, May 15, 2007 at 05:15:04PM +0100, Daniel P. Berrange wrote:
> On Tue, May 15, 2007 at 05:09:56PM +0100, Mark McLoughlin wrote:
> > On Tue, 2007-05-15 at 17:04 +0100, Daniel P. Berrange wrote:
> >
> > > For every VM we start it will create a logfile
> > >
> > > /etc/libvirt/qemu/logs/[vmname].log
> >
> > Why not /var/log? /etc/ isn't the place for this kind of stuff, surely.
>
> True - though we'd have to code different behaviour when running as an
> unprivileged user. Shouldn't complicate things too much i guess.
Attached a new version which does this. If using qemu:///system they get
put into /var/log/libvirt/qemu, while if using qemu://session they go into
$HOME/.libvirt/qemu/log
Dan.
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-------------- next part --------------
diff -rup libvirt-0.2.2.orig/libvirt.spec.in libvirt-0.2.2.new/libvirt.spec.in
--- libvirt-0.2.2.orig/libvirt.spec.in 2007-04-17 05:33:16.000000000 -0400
+++ libvirt-0.2.2.new/libvirt.spec.in 2007-05-15 13:11:28.000000000 -0400
@@ -137,6 +137,7 @@ fi
%{_datadir}/libvirt/networks/default.xml
%dir %{_localstatedir}/run/libvirt/
%dir %{_localstatedir}/lib/libvirt/
+%dir %attr(0700, root, root) %{_localstatedir}/log/libvirt/qemu/
%attr(4755, root, root) %{_libexecdir}/libvirt_proxy
%attr(0755, root, root) %{_sbindir}/libvirt_qemud
%doc docs/libvirt.rng
diff -rup libvirt-0.2.2.orig/qemud/internal.h libvirt-0.2.2.new/qemud/internal.h
--- libvirt-0.2.2.orig/qemud/internal.h 2007-05-15 10:52:00.000000000 -0400
+++ libvirt-0.2.2.new/qemud/internal.h 2007-05-15 13:02:08.000000000 -0400
@@ -63,7 +63,6 @@ typedef enum {
QEMUD_DIR_AUTOSTART,
QEMUD_DIR_NETWORK_CONFIG,
QEMUD_DIR_NETWORK_AUTOSTART,
-
QEMUD_N_CONFIG_DIRS
} qemudConfigDirType;
@@ -213,6 +212,7 @@ struct qemud_vm {
int stdout;
int stderr;
int monitor;
+ int logfile;
int pid;
int id;
int state;
@@ -319,6 +319,7 @@ struct qemud_server {
char *autostartDir;
char *networkConfigDir;
char *networkAutostartDir;
+ char logDir[PATH_MAX];
char errorMessage[QEMUD_MAX_ERROR_LEN];
int errorCode;
unsigned int shutdown : 1;
diff -rup libvirt-0.2.2.orig/qemud/Makefile.am libvirt-0.2.2.new/qemud/Makefile.am
--- libvirt-0.2.2.orig/qemud/Makefile.am 2007-04-06 07:12:29.000000000 -0400
+++ libvirt-0.2.2.new/qemud/Makefile.am 2007-05-15 13:15:52.000000000 -0400
@@ -29,6 +29,7 @@ install-data-local:
sed -i -e "s,</name>,</name>\n <uuid>$(UUID)</uuid>," $(DESTDIR)$(sysconfdir)/libvirt/qemu/networks/default.xml
test -e $(DESTDIR)$(sysconfdir)/libvirt/qemu/networks/autostart/default.xml || \
ln -s ../default.xml $(DESTDIR)$(sysconfdir)/libvirt/qemu/networks/autostart/default.xml
+ mkdir -p $(DESTDIR)$(localstatedir)/log/libvirt/qemu
mkdir -p $(DESTDIR)$(localstatedir)/run/libvirt
mkdir -p $(DESTDIR)$(localstatedir)/lib/libvirt
@@ -36,6 +37,7 @@ uninstall-local:
rm -f $(DESTDIR)$(sysconfdir)/libvirt/qemu/networks/autostart/default.xml
rm -f $(DESTDIR)$(sysconfdir)/libvirt/qemu/networks/default.xml
rmdir $(DESTDIR)$(sysconfdir)/libvirt/qemu/networks/autostart || :
+ rmdir $(DESTDIR)$(localstatedir)/log/libvirt/qemu || :
rmdir $(DESTDIR)$(localstatedir)/run/libvirt || :
rmdir $(DESTDIR)$(localstatedir)/lib/libvirt || :
diff -rup libvirt-0.2.2.orig/qemud/qemud.c libvirt-0.2.2.new/qemud/qemud.c
--- libvirt-0.2.2.orig/qemud/qemud.c 2007-05-15 10:52:00.000000000 -0400
+++ libvirt-0.2.2.new/qemud/qemud.c 2007-05-15 13:26:42.000000000 -0400
@@ -439,6 +439,9 @@ static int qemudInitPaths(struct qemud_s
goto snprintf_error;
unlink(roSockname);
+
+ if (snprintf(server->logDir, PATH_MAX, "%s/log/libvirt/qemu", LOCAL_STATE_DIR) >= PATH_MAX)
+ goto snprintf_error;
} else {
if (!(pw = getpwuid(uid))) {
qemudLog(QEMUD_ERR, "Failed to find user record for uid '%d': %s",
@@ -451,12 +454,16 @@ static int qemudInitPaths(struct qemud_s
if (snprintf(base, PATH_MAX, "%s/.", pw->pw_dir) >= PATH_MAX)
goto snprintf_error;
+
+ if (snprintf(server->logDir, PATH_MAX, "%s/.libvirt/qemu/log", pw->pw_dir) >= PATH_MAX)
+ goto snprintf_error;
}
for (i = 0; i < QEMUD_N_CONFIG_DIRS; i++)
if (snprintf(server->configDirs[i], PATH_MAX, "%s%s", base, paths[i]) >= PATH_MAX)
goto snprintf_error;
+
return 0;
snprintf_error:
@@ -785,6 +792,16 @@ qemudOpenMonitorPath(struct qemud_server
int fd ATTRIBUTE_UNUSED)
{
char monitor[PATH_MAX];
+ int len = strlen(output);
+
+ retry:
+ if (write(vm->logfile, output, len) < 0) {
+ /* Log, but ignore failures to write logfile for VM */
+ if (errno == EINTR)
+ goto retry;
+ qemudLog(QEMUD_WARN, "Unable to log VM console data: %s",
+ strerror(errno));
+ }
if (qemudExtractMonitorPath(output, monitor, sizeof(monitor)) < 0)
return 1; /* keep reading */
@@ -841,6 +858,7 @@ int qemudStartVMDaemon(struct qemud_serv
struct qemud_vm *vm) {
char **argv = NULL;
int i, ret = -1;
+ char logfile[PATH_MAX];
if (qemudIsActiveVM(vm)) {
qemudReportError(server, VIR_ERR_INTERNAL_ERROR,
@@ -859,6 +877,36 @@ int qemudStartVMDaemon(struct qemud_serv
} else
vm->def->vncActivePort = vm->def->vncPort;
+ if ((strlen(server->logDir) + /* path */
+ 1 + /* Separator */
+ strlen(vm->def->name) + /* basename */
+ 4 + /* suffix .log */
+ 1 /* NULL */) > PATH_MAX) {
+ qemudReportError(server, VIR_ERR_INTERNAL_ERROR,
+ "config file path too long: %s/%s.log",
+ server->logDir, vm->def->name);
+ return -1;
+ }
+ strcpy(logfile, server->logDir);
+ strcat(logfile, "/");
+ strcat(logfile, vm->def->name);
+ strcat(logfile, ".log");
+
+ if (qemudEnsureDir(server->logDir) < 0) {
+ qemudReportError(server, VIR_ERR_INTERNAL_ERROR,
+ "cannot create log directory %s: %s",
+ server->logDir, strerror(errno));
+ return -1;
+ }
+
+ if ((vm->logfile = open(logfile, O_CREAT | O_TRUNC | O_WRONLY,
+ S_IRUSR | S_IWUSR)) < 0) {
+ qemudReportError(server, VIR_ERR_INTERNAL_ERROR,
+ "failed to create logfile %s: %s",
+ logfile, strerror(errno));
+ return -1;
+ }
+
if (qemudBuildCommandLine(server, vm, &argv) < 0)
return -1;
@@ -1038,7 +1086,14 @@ static int qemudVMData(struct qemud_serv
}
buf[ret] = '\0';
- qemudDebug("[%s]", buf);
+ retry:
+ if (write(vm->logfile, buf, ret) < 0) {
+ /* Log, but ignore failures to write logfile for VM */
+ if (errno == EINTR)
+ goto retry;
+ qemudLog(QEMUD_WARN, "Unable to log VM console data: %s",
+ strerror(errno));
+ }
}
}
@@ -1053,10 +1108,12 @@ int qemudShutdownVMDaemon(struct qemud_s
qemudVMData(server, vm, vm->stdout);
qemudVMData(server, vm, vm->stderr);
+ close(vm->logfile);
close(vm->stdout);
close(vm->stderr);
if (vm->monitor != -1)
close(vm->monitor);
+ vm->logfile = -1;
vm->stdout = -1;
vm->stderr = -1;
vm->monitor = -1;
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