[PATCH 4/6] ch_driver: Don't error out if CH_CMD was not found

[Michal Privoznik]

The CH driver needs "cloud-hypervisor" binary. And if none was
found then the initialization of the driver fails as
chStateInitialize() returns VIR_DRV_STATE_INIT_ERROR. This in
turn means that whole daemon fails to initialize. Let's return
VIR_DRV_STATE_INIT_SKIPPED in this particular case, which
disables the CH drvier but lets the daemon run.

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
 src/ch/ch_conf.c   |  6 +++++-
 src/ch/ch_driver.c | 15 +++++++++++----
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/src/ch/ch_conf.c b/src/ch/ch_conf.c
index dfebc8525a..b2812de7ad 100644
--- a/src/ch/ch_conf.c
+++ b/src/ch/ch_conf.c
@@ -199,8 +199,12 @@ chExtractVersion(virCHDriver *driver)
     char *help = NULL;
     char *tmp = NULL;
     g_autofree char *ch_cmd = g_find_program_in_path(CH_CMD);
-    virCommand *cmd = virCommandNewArgList(ch_cmd, "--version", NULL);
+    virCommand *cmd = NULL;
 
+    if (!ch_cmd)
+        return -2;
+
+    cmd = virCommandNewArgList(ch_cmd, "--version", NULL);
     virCommandAddEnvString(cmd, "LC_ALL=C");
     virCommandSetOutputBuffer(cmd, &help);
 
diff --git a/src/ch/ch_driver.c b/src/ch/ch_driver.c
index 7d1e97098a..8c458a20bd 100644
--- a/src/ch/ch_driver.c
+++ b/src/ch/ch_driver.c
@@ -836,6 +836,9 @@ static int chStateInitialize(bool privileged,
                              virStateInhibitCallback callback G_GNUC_UNUSED,
                              void *opaque G_GNUC_UNUSED)
 {
+    int ret = VIR_DRV_STATE_INIT_ERROR;
+    int rv;
+
     if (root != NULL) {
         virReportError(VIR_ERR_INVALID_ARG, "%s",
                        _("Driver does not support embedded mode"));
@@ -861,14 +864,18 @@ static int chStateInitialize(bool privileged,
     if (!(ch_driver->config = virCHDriverConfigNew(privileged)))
         goto cleanup;
 
-    if (chExtractVersion(ch_driver) < 0)
+    if ((rv = chExtractVersion(ch_driver)) < 0) {
+        if (rv == -2)
+            ret = VIR_DRV_STATE_INIT_SKIPPED;
         goto cleanup;
+    }
 
-    return VIR_DRV_STATE_INIT_COMPLETE;
+    ret = VIR_DRV_STATE_INIT_COMPLETE;
 
  cleanup:
-    chStateCleanup();
-    return VIR_DRV_STATE_INIT_ERROR;
+    if (ret != VIR_DRV_STATE_INIT_COMPLETE)
+        chStateCleanup();
+    return ret;
 }
 
 /* Function Tables */
-- 
2.31.1