[PATCH v4 4/5] xl: Return an error on failed cd-insert

[George Dunlap <george.dunlap@eu.citrix.com>]

This makes xl more useful in scripts.

The strange thing about this is that the internal cd_insert function
*already* returned something appropriate, and cd-eject was using it,
but cd-insert wasn't.

Also:

* Rework cd_insert to return EXIT_FAILURE and EXIT_SUCCESS rather than
magic constants

* Use 'r' for non-libxl return code, as specified in CODING_STYLE

Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
---
v4:
 - Use EXIT_{SUCCESS,FAILURE} rather than  magic constants in cd_insert
 - Use 'r' rather than 'rc' for non-libxl return code
 - Fixed typo in changelog

CC: Ian Campbell <ian.campbell@citrix.com>
CC: Ian Jackson <ian.jackson@citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>
---
 tools/libxl/xl_cmdimpl.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index 1a8b4a1..0c3756b 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -3336,7 +3336,7 @@ static int cd_insert(uint32_t domid, const char *virtdev, char *phys)
     char *buf = NULL;
     XLU_Config *config = 0;
     struct stat b;
-    int rc = 0;
+    int r;
 
     xasprintf(&buf, "vdev=%s,access=r,devtype=cdrom,target=%s",
               virtdev, phys ? phys : "");
@@ -3352,18 +3352,22 @@ static int cd_insert(uint32_t domid, const char *virtdev, char *phys)
         && stat(disk.pdev_path, &b)) {
         fprintf(stderr, "Cannot stat file: %s\n",
                 disk.pdev_path);
-        rc = 1;
+        r = EXIT_FAILURE;
+        goto out;
+    }
+
+    if (libxl_cdrom_insert(ctx, domid, &disk, NULL)) {
+        r = EXIT_FAILURE;
         goto out;
     }
 
-    if (libxl_cdrom_insert(ctx, domid, &disk, NULL))
-        rc=1;
+    r = EXIT_SUCCESS;
 
 out:
     libxl_device_disk_dispose(&disk);
     free(buf);
 
-    return rc;
+    return r;
 }
 
 int main_cd_eject(int argc, char **argv)
@@ -3397,8 +3401,7 @@ int main_cd_insert(int argc, char **argv)
     virtdev = argv[optind + 1];
     file = argv[optind + 2];
 
-    cd_insert(domid, virtdev, file);
-    return 0;
+    return cd_insert(domid, virtdev, file);
 }
 
 int main_console(int argc, char **argv)
-- 
2.1.4