[PATCH] Return mount's actual error codes instead of obfuscating them.

[David Lehman <dlehman redhat com>]

In addition to being unnecessary, this obfuscation does not account for
the fact that the codes can be combined using a bitwise or.

This is part of the reason we were unable to identify the actual problem
with the series of bugs involving the error "SystemError: (2, None)"
during F11, F12, and perhaps after that.

Related: rhbz#548592
---
 pyanaconda/isys/imount.c |   43 ++++++++++---------------------------------
 pyanaconda/isys/imount.h |   13 +++----------
 2 files changed, 13 insertions(+), 43 deletions(-)

diff --git a/pyanaconda/isys/imount.c b/pyanaconda/isys/imount.c
index ed0f5a7..1b832c0 100644
--- a/pyanaconda/isys/imount.c
+++ b/pyanaconda/isys/imount.c
@@ -224,27 +224,8 @@ int mountCommandWrapper(int mode, char *dev, char *where, char *fs,
 
     if (!WIFEXITED(status))
         return IMOUNT_ERR_OTHER;
-    else if ( (rc = WEXITSTATUS(status)) ) {
-        /* Refer to 'man mount' for the meaning of the error codes. */
-        switch (rc) {
-        case 1:
-            return IMOUNT_ERR_PERMISSIONS;
-        case 2:
-            return IMOUNT_ERR_SYSTEM;
-        case 4:
-            return IMOUNT_ERR_MOUNTINTERNAL;
-        case 8:
-            return IMOUNT_ERR_USERINTERRUPT;
-        case 16:
-            return IMOUNT_ERR_MTAB;
-        case 32:
-            return IMOUNT_ERR_MOUNTFAILURE;
-        case 64:
-            return IMOUNT_ERR_PARTIALSUCC;
-        default:
-            return IMOUNT_ERR_OTHER;
-        }
-    }
+    else if ( (rc = WEXITSTATUS(status)) )
+        return rc;
 
     return 0;
 }
@@ -289,20 +270,16 @@ int mkdirChain(char * origChain) {
     return 0;
 }
 
-/* Returns true iff it is possible that the mount command that have returned
- * 'errno' might succeed at a later time (think e.g. not yet initialized USB
- * device, etc.) */
+/* Returns true iff it is possible that a failed mount command might
+ * succeed at a later time (think e.g. not yet initialized USB device,
+ * etc.) */
 int mountMightSucceedLater(int mountRc)
 {
-    int rc;
-    switch (mountRc) {
-    case IMOUNT_ERR_MOUNTFAILURE:
-        rc = 1;
-        break;
-    default:
-        rc = 0;
-    }
-    return rc;
+    /* 32 is the mount exit code for "mount failure" */
+    if (mountRc > 0 && mountRc & 0x20)
+        return 1;
+    else
+        return 0;
 }
 
 static int mkdirIfNone(char * directory) {
diff --git a/pyanaconda/isys/imount.h b/pyanaconda/isys/imount.h
index d1b7cf3..e04d3a7 100644
--- a/pyanaconda/isys/imount.h
+++ b/pyanaconda/isys/imount.h
@@ -20,16 +20,9 @@
 #ifndef H_IMOUNT
 #define H_IMOUNT
 
-#define IMOUNT_ERR_ERRNO          1
-#define IMOUNT_ERR_OTHER          2
-#define IMOUNT_ERR_MODE           3
-#define IMOUNT_ERR_PERMISSIONS    4
-#define IMOUNT_ERR_SYSTEM         5
-#define IMOUNT_ERR_MOUNTINTERNAL  6
-#define IMOUNT_ERR_USERINTERRUPT  7
-#define IMOUNT_ERR_MTAB           8
-#define IMOUNT_ERR_MOUNTFAILURE   9
-#define IMOUNT_ERR_PARTIALSUCC    10
+#define IMOUNT_ERR_ERRNO          -1
+#define IMOUNT_ERR_OTHER          -2
+#define IMOUNT_ERR_MODE           -3
 
 #include <sys/mount.h>		/* for umount() */
 
-- 
1.7.2.3