[PATCH 1/2] Add a method to determine whether a block device is read-only.

[Chris Lumens <clumens@xxxxxxxxxx>]

---
 isys/isys.c  |   24 ++++++++++++++++++++++++
 isys/isys.py |    6 ++++++
 2 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/isys/isys.c b/isys/isys.c
index fcec6fd..90a697c 100644
--- a/isys/isys.c
+++ b/isys/isys.c
@@ -124,6 +124,7 @@ static PyObject * doGetBiosDisk(PyObject * s, PyObject * args);
 static PyObject * doSegvHandler(PyObject *s, PyObject *args);
 static PyObject * doAuditDaemon(PyObject *s);
 static PyObject * doPrefixToNetmask(PyObject *s, PyObject *args);
+static PyObject * doDeviceReadOnly(PyObject *s, PyObject *args);
 
 static PyMethodDef isysModuleMethods[] = {
     { "ejectcdrom", (PyCFunction) doEjectCdrom, METH_VARARGS, NULL },
@@ -180,6 +181,7 @@ static PyMethodDef isysModuleMethods[] = {
     { "handleSegv", (PyCFunction) doSegvHandler, METH_VARARGS, NULL },
     { "auditdaemon", (PyCFunction) doAuditDaemon, METH_NOARGS, NULL },
     { "prefix2netmask", (PyCFunction) doPrefixToNetmask, METH_VARARGS, NULL },
+    { "deviceIsReadOnly", (PyCFunction) doDeviceReadOnly, METH_VARARGS, NULL },
     { NULL, NULL, 0, NULL }
 } ;
 
@@ -1416,4 +1418,26 @@ static PyObject * doAuditDaemon(PyObject *s) {
     return Py_None;
 }
 
+static PyObject * doDeviceReadOnly(PyObject *s, PyObject *args) {
+    char *diskname = NULL;
+    int fd, is_ro;
+
+    if (!PyArg_ParseTuple(args, "s", &diskname)) return NULL;
+
+    fd = open(diskname, O_RDONLY);
+    if (fd == -1) {
+      Py_INCREF(Py_None);
+      return Py_None;
+    }
+
+    if (ioctl(fd, BLKROGET, &is_ro)) {
+        close(fd);
+        PyErr_SetFromErrno(PyExc_SystemError);
+        return NULL;
+    }
+
+    close(fd);
+    return PyBool_FromLong(is_ro);
+}
+
 /* vim:set shiftwidth=4 softtabstop=4: */
diff --git a/isys/isys.py b/isys/isys.py
index 4063130..189a6c1 100644
--- a/isys/isys.py
+++ b/isys/isys.py
@@ -804,6 +804,12 @@ def driveUsesModule(device, modules):
                     pass
     return rc
 
+def deviceIsReadOnly(device):
+    if not device.startswith("/dev/"):
+        return _isys.deviceIsReadOnly("/dev/" + device)
+    else:
+        return _isys.deviceIsReadOnly(device)
+
 def mediaPresent(device):
     try:
         fd = os.open("/dev/%s" % device, os.O_RDONLY)
-- 
1.6.1.3

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