tpm: Create empty log file if file was removed

Create an empty log file if the log file was removed, otherwise the
transaction to set the security labels on the file will fail.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20190726210706.24440-3-stefanb@linux.ibm.com>

diff --git a/src/qemu/qemu_tpm.c b/src/qemu/qemu_tpm.c
index 7efd6358310f0422cdfd5de821e57fd00a38c02e..77ef601f7405c869128346da86bed6b008d1ef5f 100644 (file)
--- a/src/qemu/qemu_tpm.c
+++ b/src/qemu/qemu_tpm.c
@@ -340,9 +340,13 @@ qemuTPMEmulatorPrepareHost(virDomainTPMDefPtr tpm,
                     logDir, vmname) < 0)
         goto cleanup;
 
+    if (!virFileExists(tpm->data.emulator.logfile) &&
+        virFileTouch(tpm->data.emulator.logfile, 0644) < 0) {
+        goto cleanup;
+    }
+
     /* ... and make sure it can be accessed by swtpm_user */
-    if (virFileExists(tpm->data.emulator.logfile) &&
-        chown(tpm->data.emulator.logfile, swtpm_user, swtpm_group) < 0) {
+    if (chown(tpm->data.emulator.logfile, swtpm_user, swtpm_group) < 0) {
         virReportSystemError(errno,
                              _("Could not chown on swtpm logfile %s"),
                              tpm->data.emulator.logfile);