block: fix error reporting

The current block code wrongly reported the return value of the mount() and
umount2() syscalls, which is always -1 in case the call failed.

Use errno and strerror(errno) instead to propagate the correct error code to
the user.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

diff --git a/block.c b/block.c
index 9de8343..8de83b7 100644 (file)
--- a/block.c
+++ b/block.c
@@ -22,6 +22,7 @@
 #include <dirent.h>
 #include <stdarg.h>
 #include <string.h>
+#include <errno.h>
 
 #include <sys/stat.h>
 #include <sys/types.h>
@@ -804,7 +805,7 @@ static int mount_device(struct probe_info *pr, int hotplug)
                            (m->options) ? (m->options) : (""));
                if (err)
                        ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
-                                pr->dev, pr->type, target, err, strerror(err));
+                                pr->dev, pr->type, target, errno, strerror(errno));
                else
                        handle_swapfiles(true);
                return err;
@@ -823,7 +824,7 @@ static int mount_device(struct probe_info *pr, int hotplug)
                err = mount(pr->dev, target, pr->type, 0, "");
                if (err)
                        ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
-                                pr->dev, pr->type, target, err, strerror(err));
+                                pr->dev, pr->type, target, errno, strerror(errno));
                else
                        handle_swapfiles(true);
                return err;
@@ -856,7 +857,7 @@ static int umount_device(struct probe_info *pr)
        err = umount2(mp, MNT_DETACH);
        if (err)
                ULOG_ERR("unmounting %s (%s)  failed (%d) - %s\n",
-                        pr->dev, mp, err, strerror(err));
+                        pr->dev, mp, errno, strerror(errno));
        else
                ULOG_INFO("unmounted %s (%s)\n",
                          pr->dev, mp);
@@ -885,7 +886,7 @@ static int main_hotplug(int argc, char **argv)
 
                if (err)
                        ULOG_ERR("umount of %s failed (%d) - %s\n",
-                                mount_point, err, strerror(err));
+                                mount_point, errno, strerror(errno));
 
                free(mount_point);
                return 0;
@@ -1176,7 +1177,7 @@ static int mount_extroot(char *cfg)
 
                if (err) {
                        ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%s)\n",
-                                pr->dev, pr->type, path, err, strerror(err));
+                                pr->dev, pr->type, path, errno, strerror(errno));
                } else if (m->overlay) {
                        err = check_extroot(path);
                        if (err)