dmeventd_thind: set LVM_RUN_BY_DMEVENTD

Set LVM_RUN_BY_DMEVENTD envvar to expose the command is runing from
dmeventd environment.

diff --git a/daemons/dmeventd/plugins/thin/dmeventd_thin.c b/daemons/dmeventd/plugins/thin/dmeventd_thin.c
index a6a534daf81433443e4a310ac7384cfa00668d4e..f5519712b5d786e04cf0280e2376d242a370bbb2 100644 (file)
--- a/daemons/dmeventd/plugins/thin/dmeventd_thin.c
+++ b/daemons/dmeventd/plugins/thin/dmeventd_thin.c
@@ -69,19 +69,23 @@ DM_EVENT_LOG_FN("thin")
 
 static int _run_command(struct dso_state *state)
 {
-       char val[2][36];
-       char *env[] = { val[0], val[1], NULL };
+       char val[3][36];
+       char *env[] = { val[0], val[1], val[2], NULL };
        int i;
 
+       /* Mark for possible lvm2 command we are running from dmeventd
+        * lvm2 will not try to talk back to dmeventd while processing it */
+       (void) dm_snprintf(val[0], sizeof(val[0]), "LVM_RUN_BY_DMEVENTD=1");
+
        if (state->data_percent) {
                /* Prepare some known data to env vars for easy use */
-               (void) dm_snprintf(val[0], sizeof(val[0]), "DMEVENTD_THIN_POOL_DATA=%d",
+               (void) dm_snprintf(val[1], sizeof(val[1]), "DMEVENTD_THIN_POOL_DATA=%d",
                                   state->data_percent / DM_PERCENT_1);
-               (void) dm_snprintf(val[1], sizeof(val[1]), "DMEVENTD_THIN_POOL_METADATA=%d",
+               (void) dm_snprintf(val[2], sizeof(val[2]), "DMEVENTD_THIN_POOL_METADATA=%d",
                                   state->metadata_percent / DM_PERCENT_1);
        } else {
                /* For an error event it's for a user to check status and decide */
-               env[0] = NULL;
+               env[1] = NULL;
                log_debug("Error event processing");
        }