1 files changed, 80 insertions, 0 deletions
diff --git a/libmount/src/context_umount.c b/libmount/src/context_umount.c
index 28787dab1..a2bba8060 100644
--- a/libmount/src/context_umount.c
+++ b/libmount/src/context_umount.c
@@ -1016,3 +1016,83 @@ int mnt_context_next_umount(struct libmnt_context *cxt,
 		*mntrc = rc;
 	return 0;
 }
+
+
+int mnt_context_get_umount_excode(
+			struct libmnt_context *cxt,
+			int rc,
+			char *buf,
+			size_t bufsz)
+{
+	if (mnt_context_helper_executed(cxt))
+		/*
+		 * /sbin/umount.<type> called, return status
+		 */
+		return mnt_context_get_helper_status(cxt);
+
+	if (rc == 0 && mnt_context_get_status(cxt) == 1)
+		/*
+		 * Libmount success && syscall success.
+		 */
+		return MNT_EX_SUCCESS;
+
+	if (!mnt_context_syscall_called(cxt)) {
+		/*
+		 * libmount errors (extra library checks)
+		 */
+		if (rc == -EPERM && !mnt_context_tab_applied(cxt)) {
+			/* failed to evaluate permissions because not found
+			 * relevant entry in mtab */
+			if (buf)
+				snprintf(buf, bufsz, _("not mounted"));
+			return MNT_EX_USAGE;
+		}
+		return mnt_context_get_generic_excode(rc, buf, bufsz,
+					_("umount failed: %m"));
+
+	} else if (mnt_context_get_syscall_errno(cxt) == 0) {
+		/*
+		 * umount(2) syscall success, but something else failed
+		 * (probably error in mtab processing).
+		 */
+		if (rc < 0)
+			return mnt_context_get_generic_excode(rc, buf, bufsz,
+				_("filesystem was unmounted, but any subsequent operation failed: %m"));
+
+		return MNT_EX_SOFTWARE;	/* internal error */
+	}
+
+	/*
+	 * umount(2) errors
+	 */
+	if (buf) {
+		int syserr = mnt_context_get_syscall_errno(cxt);
+
+		switch (syserr) {
+		case ENXIO:
+			snprintf(buf, bufsz, _("invalid block device"));	/* ??? */
+			break;
+		case EINVAL:
+			snprintf(buf, bufsz, _("not mounted"));
+			break;
+		case EIO:
+			snprintf(buf, bufsz, _("can't write superblock"));
+			break;
+		case EBUSY:
+			snprintf(buf, bufsz, _("target is busy"));
+			break;
+		case ENOENT:
+			snprintf(buf, bufsz, _("no mount point specified"));
+			break;
+		case EPERM:
+			snprintf(buf, bufsz, _("must be superuser to unmount"));
+			break;
+		case EACCES:
+			snprintf(buf, bufsz, _("block devices are not permitted on filesystem"));
+			break;
+		default:
+			return mnt_context_get_generic_excode(syserr, buf, bufsz,_("umount(2) system call failed: %m"));
+		}
+	}
+	return MNT_EX_FAIL;
+}