[Qemu-devel] [PATCH 13/26] ccid-card-passthru, dev-smartcard-reader: add debug environment variables

[Alon Levy <alevy@redhat.com>]

From: Alon Levy <alon@pobox.com>

This overrides whatever debug value is set on the corresponding devices
from the command line, and is meant to ease the usage with any
management stack. For libvirt you can set environment variables by
extending the dom namespace, i.e:

<domain type='kvm' id='3' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
  <qemu:commandline>
    <qemu:env name='QEMU_CCID_PASSTHRU_DEBUG' value='4'/>
    <qemu:env name='QEMU_CCID_DEBUG' value='4'/>
  </qemu:commandline>
</domain>

Signed-off-by: Alon Levy <alevy@redhat.com>
---
 hw/ccid-card-passthru.c       | 16 ++++++++++++++++
 hw/usb/dev-smartcard-reader.c | 16 ++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/hw/ccid-card-passthru.c b/hw/ccid-card-passthru.c
index 111894f..80fe514 100644
--- a/hw/ccid-card-passthru.c
+++ b/hw/ccid-card-passthru.c
@@ -350,6 +350,22 @@ static int passthru_initfn(CCIDCardState *base)
         error_report("missing chardev");
         return -1;
     }
+    {
+        char *debug_env = getenv("QEMU_CCID_PASSTHRU_DEBUG");
+        char *inv = NULL;
+        int debug;
+        if (debug_env) {
+            debug = strtol(debug_env, &inv, 10);
+            if (inv != debug_env) {
+                if (debug < 0 || debug > D_VERBOSE) {
+                    fprintf(stderr, "warning: QEMU_CCID_PASSTHRU_DEBUG"
+                            " not in [0, %d]", D_VERBOSE);
+                } else {
+                    card->debug = debug;
+                }
+            }
+        }
+    }
     assert(sizeof(DEFAULT_ATR) <= MAX_ATR_SIZE);
     memcpy(card->atr, DEFAULT_ATR, sizeof(DEFAULT_ATR));
     card->atr_length = sizeof(DEFAULT_ATR);
diff --git a/hw/usb/dev-smartcard-reader.c b/hw/usb/dev-smartcard-reader.c
index caebc1c..fc950c8 100644
--- a/hw/usb/dev-smartcard-reader.c
+++ b/hw/usb/dev-smartcard-reader.c
@@ -1201,6 +1201,22 @@ static int ccid_initfn(USBDevice *dev)
     s->bulk_out_pos = 0;
     ccid_reset_parameters(s);
     ccid_reset(s);
+    {
+        char *debug_env = getenv("QEMU_CCID_DEBUG");
+        char *inv = NULL;
+        int debug;
+        if (debug_env) {
+            debug = strtol(debug_env, &inv, 10);
+            if (inv != debug_env) {
+                if (debug < 0 || debug > D_VERBOSE) {
+                    fprintf(stderr, "warning: QEMU_CCID_PASSTHRU_DEBUG"
+                            " not in [0, %d]", D_VERBOSE);
+                } else {
+                    s->debug = debug;
+                }
+            }
+        }
+    }
     return 0;
 }
 
-- 
1.8.1.4