Use libcalamares.utils.chroot_call in grub jobmodule.

src/modules/grub/main.py

@@ -17,24 +17,17 @@
 #   You should have received a copy of the GNU General Public License
 #   along with Calamares. If not, see <http://www.gnu.org/licenses/>.
 
-import os
-import subprocess
 
 import libcalamares
 
 
-def chroot_call(root_mount_point, cmd):
-    subprocess.check_call(["chroot", root_mount_point] + cmd)
-
-
-def install_grub(root_mount_point, boot_loader):
+def install_grub(boot_loader):
     install_path = boot_loader["installPath"]
-    chroot_call(root_mount_point, ["grub-install", install_path])
-    chroot_call(root_mount_point, ["grub-mkconfig", "-o", "/boot/grub/grub.cfg"])
+    libcalamares.utils.chroot_call(["grub-install", install_path])
+    libcalamares.utils.chroot_call(["grub-mkconfig", "-o", "/boot/grub/grub.cfg"])
 
 
 def run():
-    root_mount_point = libcalamares.globalstorage.value("rootMountPoint")
     boot_loader = libcalamares.globalstorage.value("bootLoader")
-    install_grub(root_mount_point, boot_loader)
+    install_grub(boot_loader)
     return None