nixos-install: fix removal of non-empty /mnt

mode89 · mode89 · commit d61cc625fa0a · 2023-08-02T16:37:22.000+08:00
After building the target system, `nixos-install` tries to remove `/mnt` on the target filesystem. And the script may fail without any explanation, if `/mnt` isn't empty. This commit makes the installation process carry on even if there are files under `/mnt`. See #244643.
diff --git a/nixos/modules/installer/tools/nixos-install.sh b/nixos/modules/installer/tools/nixos-install.sh
@@ -206,7 +206,7 @@ if [[ -z $noBootLoader ]]; then
       mount --rbind --mkdir / "$mountPoint"
       mount --make-rslave "$mountPoint"
       /run/current-system/bin/switch-to-configuration boot
-      umount -R "$mountPoint" && rmdir "$mountPoint"
+      umount -R "$mountPoint" && (rmdir "$mountPoint" 2>/dev/null || true)
 EOF
 )"
 fi
