From 3099610c27eeefd254195fafc67df06e66625b75 Mon Sep 17 00:00:00 2001
From: Skyrant <sascha.tausend@gmail.com>
Date: Sun, 15 Mar 2026 16:03:45 +0100
Subject: [PATCH 1/3] Add isset guards to enable runtime variable overrides

Add isset guards to all set commands in boot.cfg.j2 and menu templates
to allow variables to be overridden in local-vars.ipxe without requiring
a rebuild. This makes netboot.xyz more flexible for users who want to
customize mirrors, timeouts, and menu options at boot time.

Changes:
- boot.cfg.j2: Add isset guards to all global vars, mirror loop, architecture
  flags, and cloud-specific settings
- tinycore.ipxe.j2: Add isset guard to tinycore_mirror
- k3os.ipxe.j2: Add isset guard to k3os_mirror
- debian.ipxe.j2: Add isset guard to debian_mirror, remove redundant no-op
- ubuntu.ipxe.j2: Add isset guard to ubuntu_mirror
- archlinux.ipxe.j2: Add clarifying comment about archlinux_mirror

All variables now follow the pattern: isset ${var} || set var value

This is fully backwards compatible and follows existing patterns used by
live_endpoint and boot_timeout variables.
---
 .../templates/menu/archlinux.ipxe.j2          |   1 +
 roles/netbootxyz/templates/menu/boot.cfg.j2   | 108 +++++++++---------
 .../netbootxyz/templates/menu/debian.ipxe.j2  |   4 +-
 roles/netbootxyz/templates/menu/k3os.ipxe.j2  |   2 +-
 .../templates/menu/tinycore.ipxe.j2           |   2 +-
 .../netbootxyz/templates/menu/ubuntu.ipxe.j2  |   2 +-
 6 files changed, 60 insertions(+), 59 deletions(-)

diff --git a/roles/netbootxyz/templates/menu/archlinux.ipxe.j2 b/roles/netbootxyz/templates/menu/archlinux.ipxe.j2
index fc9b6f93af..51a3a7bf6e 100644
--- a/roles/netbootxyz/templates/menu/archlinux.ipxe.j2
+++ b/roles/netbootxyz/templates/menu/archlinux.ipxe.j2
@@ -8,6 +8,7 @@ iseq ${os_arch} x86_64 && set os_arch x86_64 ||
 iseq ${os_arch} i386 && set os_arch i686 ||
 isset ${dhcp-server} || goto static_ip
 set ipparam BOOTIF=${netX/mac} ip=dhcp
+# archlinux_mirror is set in boot.cfg.j2 with isset guard, safe to use here
 set real_archlinux_mirror ${archlinux_mirror}
 goto goto_menu
 
diff --git a/roles/netbootxyz/templates/menu/boot.cfg.j2 b/roles/netbootxyz/templates/menu/boot.cfg.j2
index be8b0f2cfc..4a60c0abc8 100644
--- a/roles/netbootxyz/templates/menu/boot.cfg.j2
+++ b/roles/netbootxyz/templates/menu/boot.cfg.j2
@@ -2,25 +2,25 @@
 
 :global_vars
 # set site name
-set site_name {{ site_name }}
+isset ${site_name} || set site_name {{ site_name }}
 
 # set boot domain
-set boot_domain {{ boot_domain }}
+isset ${boot_domain} || set boot_domain {{ boot_domain }}
 
 # set location of memdisk
-set memdisk {{ memdisk_location }}
+isset ${memdisk} || set memdisk {{ memdisk_location }}
 
 # set location of custom netboot.xyz live assets, override in local-vars.ipxe
 isset ${live_endpoint} || set live_endpoint {{ live_endpoint }}
 
 # signature check enabled?
-set sigs_enabled {{ sigs_enabled | default(false) | bool | lower }}
+isset ${sigs_enabled} || set sigs_enabled {{ sigs_enabled | default(false) | bool | lower }}
 
 # set location of signatures for sources
-set sigs {{ sigs_location }}
+isset ${sigs} || set sigs {{ sigs_location }}
 
 # set location of latest iPXE
-iseq ${platform} efi && set ipxe_disk netboot.xyz-snponly.efi || set ipxe_disk netboot.xyz-undionly.kpxe
+isset ${ipxe_disk} || iseq ${platform} efi && set ipxe_disk netboot.xyz-snponly.efi || set ipxe_disk netboot.xyz-undionly.kpxe
 
 # set default boot timeout
 isset ${boot_timeout} || set boot_timeout {{ boot_timeout }}
@@ -32,8 +32,8 @@ isset ${boot_timeout} || set boot_timeout {{ boot_timeout }}
 {% for key, value in releases.items() | sort(attribute='1.name') %}
 {% if value.mirror is defined and value.base_dir is defined %}
 ### {{ value.name }}
-set {{ key }}_mirror {{ value.mirror }}
-set {{ key }}_base_dir {{ value.base_dir }}
+isset ${{{ key }}_mirror} || set {{ key }}_mirror {{ value.mirror }}
+isset ${{{ key }}_base_dir} || set {{ key }}_base_dir {{ value.base_dir }}
 
 {% endif %}
 {% endfor %}
@@ -41,51 +41,51 @@ set {{ key }}_base_dir {{ value.base_dir }}
 # determine architectures and enable menu options
 #################################################
 :architectures
-set menu_linux 1
-set menu_bsd 1
-set menu_unix 1
-set menu_freedos 1
-set menu_live 1
-set menu_pci 1
-set menu_windows 1
-set menu_utils 1
+isset ${menu_linux} || set menu_linux 1
+isset ${menu_bsd} || set menu_bsd 1
+isset ${menu_unix} || set menu_unix 1
+isset ${menu_freedos} || set menu_freedos 1
+isset ${menu_live} || set menu_live 1
+isset ${menu_pci} || set menu_pci 1
+isset ${menu_windows} || set menu_windows 1
+isset ${menu_utils} || set menu_utils 1
 iseq ${arch} i386 && goto i386 ||
 iseq ${arch} x86_64 && goto x86_64 ||
 iseq ${arch} arm64 && goto arm64 ||
 goto architectures_end
 :x86_64
-set menu_linux_i386 0
+isset ${menu_linux_i386} || set menu_linux_i386 0
 iseq ${platform} efi && goto efi ||
 goto architectures_end
 :i386
-set menu_linux 0
-set menu_linux_i386 1
-set menu_bsd 1
-set menu_unix 0
-set menu_freedos 1
-set menu_live 0
-set menu_windows 0
-set menu_utils 1
+isset ${menu_linux} || set menu_linux 0
+isset ${menu_linux_i386} || set menu_linux_i386 1
+isset ${menu_bsd} || set menu_bsd 1
+isset ${menu_unix} || set menu_unix 0
+isset ${menu_freedos} || set menu_freedos 1
+isset ${menu_live} || set menu_live 0
+isset ${menu_windows} || set menu_windows 0
+isset ${menu_utils} || set menu_utils 1
 iseq ${platform} efi && goto efi ||
 goto architectures_end
 :arm64
-set menu_linux 0
-set menu_linux_arm 1
-set menu_unix 0
-set menu_freedos 0
-set menu_live 0
-set menu_live_arm 1
-set menu_windows 0
-set menu_utils 0
-set menu_utils_arm 1
-set menu_pci 0
+isset ${menu_linux} || set menu_linux 0
+isset ${menu_linux_arm} || set menu_linux_arm 1
+isset ${menu_unix} || set menu_unix 0
+isset ${menu_freedos} || set menu_freedos 0
+isset ${menu_live} || set menu_live 0
+isset ${menu_live_arm} || set menu_live_arm 1
+isset ${menu_windows} || set menu_windows 0
+isset ${menu_utils} || set menu_utils 0
+isset ${menu_utils_arm} || set menu_utils_arm 1
+isset ${menu_pci} || set menu_pci 0
 iseq ${platform} efi && goto efi ||
 goto architectures_end
 :efi
-set menu_bsd 1
-set menu_freedos 0
-set menu_unix 0
-set menu_pci 0
+isset ${menu_bsd} || set menu_bsd 1
+isset ${menu_freedos} || set menu_freedos 0
+isset ${menu_unix} || set menu_unix 0
+isset ${menu_pci} || set menu_pci 0
 goto architectures_end
 :architectures_end
 goto clouds
@@ -100,7 +100,7 @@ iseq ${ipxe_cloud_config} packet && goto metal ||
 goto clouds_end
 
 :gce
-set cmdline console=ttyS0,115200n8
+isset ${cmdline} || set cmdline console=ttyS0,115200n8
 goto clouds_end
 
 :metal
@@ -110,23 +110,23 @@ iseq ${arch} arm64 && goto metal_arm64 ||
 goto clouds_end
 
 :metal_x86_64
-set cmdline console=ttyS1,115200n8
-iseq ${platform} efi && set ipxe_disk netboot.xyz-metal-snp.efi || set ipxe_disk netboot.xyz-metal.kpxe
-set menu_linux_i386 0
-set menu_freedos 0
-set menu_windows 0
-iseq ${platform} efi && set menu_pci 0 ||
+isset ${cmdline} || set cmdline console=ttyS1,115200n8
+isset ${ipxe_disk} || iseq ${platform} efi && set ipxe_disk netboot.xyz-metal-snp.efi || set ipxe_disk netboot.xyz-metal.kpxe
+isset ${menu_linux_i386} || set menu_linux_i386 0
+isset ${menu_freedos} || set menu_freedos 0
+isset ${menu_windows} || set menu_windows 0
+isset ${menu_pci} || iseq ${platform} efi && set menu_pci 0 ||
 goto clouds_end
 
 :metal_arm64
-set cmdline console=ttyAMA0,115200
-set ipxe_disk netboot.xyz-metal-arm64-snp.efi
-set menu_bsd 1
-set menu_freedos 0
-set menu_live 0
-set menu_windows 0
-set menu_utils 0
-set menu_pci 0
+isset ${cmdline} || set cmdline console=ttyAMA0,115200
+isset ${ipxe_disk} || set ipxe_disk netboot.xyz-metal-arm64-snp.efi
+isset ${menu_bsd} || set menu_bsd 1
+isset ${menu_freedos} || set menu_freedos 0
+isset ${menu_live} || set menu_live 0
+isset ${menu_windows} || set menu_windows 0
+isset ${menu_utils} || set menu_utils 0
+isset ${menu_pci} || set menu_pci 0
 goto clouds_end
 
 :clouds_end
diff --git a/roles/netbootxyz/templates/menu/debian.ipxe.j2 b/roles/netbootxyz/templates/menu/debian.ipxe.j2
index f3bc025ef1..d27f2f1052 100644
--- a/roles/netbootxyz/templates/menu/debian.ipxe.j2
+++ b/roles/netbootxyz/templates/menu/debian.ipxe.j2
@@ -30,7 +30,7 @@ goto mirrorcfg
 
 :older_release
 set older_release true
-set debian_mirror {{ releases.debian.archive_mirror }}
+isset ${debian_mirror} || set debian_mirror {{ releases.debian.archive_mirror }}
 echo Setting mirror to ${debian_mirror}
 clear debian_version
 echo -n Please set enter code name of release: ${} && read debian_version
@@ -38,7 +38,7 @@ set dir ${debian_base_dir}/dists/${debian_version}/main/installer-${os_arch}/cur
 goto deb_boot_type
 
 :mirrorcfg
-set debian_mirror ${debian_mirror}
+# debian_mirror is set in boot.cfg.j2 with isset guard, no need to reassign
 set mirrorcfg mirror/suite=${debian_version}
 set dir ${debian_base_dir}/dists/${debian_version}/main/installer-${os_arch}/current/images/netboot/
 goto deb_boot_type
diff --git a/roles/netbootxyz/templates/menu/k3os.ipxe.j2 b/roles/netbootxyz/templates/menu/k3os.ipxe.j2
index 43671d4cdb..401dfb868d 100644
--- a/roles/netbootxyz/templates/menu/k3os.ipxe.j2
+++ b/roles/netbootxyz/templates/menu/k3os.ipxe.j2
@@ -10,7 +10,7 @@ goto ${menu} ||
 set os {{ releases.k3os.name }}
 set os_arch ${arch}
 iseq ${os_arch} x86_64 && set os_arch amd64 ||
-set k3os_mirror {{ releases.k3os.mirror }}
+isset ${k3os_mirror} || set k3os_mirror {{ releases.k3os.mirror }}
 isset ${k3os_version} || set k3os_version latest
 isset ${k3os_install_device} || set k3os_install_device /dev/sda
 menu ${os} by Rancher
diff --git a/roles/netbootxyz/templates/menu/tinycore.ipxe.j2 b/roles/netbootxyz/templates/menu/tinycore.ipxe.j2
index e742fab293..a4faa6c51c 100644
--- a/roles/netbootxyz/templates/menu/tinycore.ipxe.j2
+++ b/roles/netbootxyz/templates/menu/tinycore.ipxe.j2
@@ -3,7 +3,7 @@
 # Tiny Core Linux
 # http://tinycorelinux.net/downloads.html
 
-set tinycore_mirror {{ releases.tinycore.mirror }}
+isset ${tinycore_mirror} || set tinycore_mirror {{ releases.tinycore.mirror }}
 
 :arch_menu
 set os Tiny Core Linux
diff --git a/roles/netbootxyz/templates/menu/ubuntu.ipxe.j2 b/roles/netbootxyz/templates/menu/ubuntu.ipxe.j2
index d17bcb3874..351bc2392e 100644
--- a/roles/netbootxyz/templates/menu/ubuntu.ipxe.j2
+++ b/roles/netbootxyz/templates/menu/ubuntu.ipxe.j2
@@ -33,7 +33,7 @@ goto mirrorcfg
 
 :older_release
 set older_release true
-set ubuntu_mirror {{ releases.ubuntu.archive_mirror }}
+isset ${ubuntu_mirror} || set ubuntu_mirror {{ releases.ubuntu.archive_mirror }}
 echo Setting mirror to ${ubuntu_mirror}
 clear ubuntu_version
 echo -n Please set enter code name of release: ${} && read ubuntu_version

From b0954124103348b9b798135e30750d43e396dbc4 Mon Sep 17 00:00:00 2001
From: Skyrant <sascha.tausend@gmail.com>
Date: Mon, 16 Mar 2026 08:01:30 +0100
Subject: [PATCH 2/3] Fix Jinja2 syntax for isset guards in mirror loop

Use string concatenation to properly construct iPXE variable references
like ${ubuntu_mirror} instead of invalid ${{{ key }}_mirror} syntax.
---
 roles/netbootxyz/templates/menu/boot.cfg.j2 | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/roles/netbootxyz/templates/menu/boot.cfg.j2 b/roles/netbootxyz/templates/menu/boot.cfg.j2
index 4a60c0abc8..76b15f94ea 100644
--- a/roles/netbootxyz/templates/menu/boot.cfg.j2
+++ b/roles/netbootxyz/templates/menu/boot.cfg.j2
@@ -32,8 +32,8 @@ isset ${boot_timeout} || set boot_timeout {{ boot_timeout }}
 {% for key, value in releases.items() | sort(attribute='1.name') %}
 {% if value.mirror is defined and value.base_dir is defined %}
 ### {{ value.name }}
-isset ${{{ key }}_mirror} || set {{ key }}_mirror {{ value.mirror }}
-isset ${{{ key }}_base_dir} || set {{ key }}_base_dir {{ value.base_dir }}
+isset {{ '${' + key + '_mirror}' }} || set {{ key }}_mirror {{ value.mirror }}
+isset {{ '${' + key + '_base_dir}' }} || set {{ key }}_base_dir {{ value.base_dir }}
 
 {% endif %}
 {% endfor %}

From 88a14bda3139c954b2b4d8e99e538a5df41b6064 Mon Sep 17 00:00:00 2001
From: Skyrant <sascha.tausend@gmail.com>
Date: Mon, 16 Mar 2026 08:54:03 +0100
Subject: [PATCH 3/3] Refine isset guards - only for user-configurable
 variables

Remove isset guards from architecture/platform-specific settings that must
be enforced based on hardware detection:
- ipxe_disk: Bootloader must match detected platform
- menu_* flags: Menu options must respect arch/platform capabilities

Remove isset guards from distro-specific mirror variables not in the
boot.cfg mirror loop (debian, ubuntu, k3os, tinycore).

Keep isset guards only for truly user-configurable settings:
- Global config (site_name, boot_domain, timeouts, etc.)
- Mirror loop variables for distros in releases dict
- Cloud-specific boot parameters (cmdline)

This prevents users from accidentally enabling incompatible menus or
bootloaders while still allowing customization of mirrors and timeouts.
---
 .../templates/menu/archlinux.ipxe.j2          |  1 -
 roles/netbootxyz/templates/menu/boot.cfg.j2   | 88 +++++++++----------
 .../netbootxyz/templates/menu/debian.ipxe.j2  |  2 +-
 roles/netbootxyz/templates/menu/k3os.ipxe.j2  |  2 +-
 .../templates/menu/tinycore.ipxe.j2           |  2 +-
 .../netbootxyz/templates/menu/ubuntu.ipxe.j2  |  2 +-
 6 files changed, 48 insertions(+), 49 deletions(-)

diff --git a/roles/netbootxyz/templates/menu/archlinux.ipxe.j2 b/roles/netbootxyz/templates/menu/archlinux.ipxe.j2
index 51a3a7bf6e..fc9b6f93af 100644
--- a/roles/netbootxyz/templates/menu/archlinux.ipxe.j2
+++ b/roles/netbootxyz/templates/menu/archlinux.ipxe.j2
@@ -8,7 +8,6 @@ iseq ${os_arch} x86_64 && set os_arch x86_64 ||
 iseq ${os_arch} i386 && set os_arch i686 ||
 isset ${dhcp-server} || goto static_ip
 set ipparam BOOTIF=${netX/mac} ip=dhcp
-# archlinux_mirror is set in boot.cfg.j2 with isset guard, safe to use here
 set real_archlinux_mirror ${archlinux_mirror}
 goto goto_menu
 
diff --git a/roles/netbootxyz/templates/menu/boot.cfg.j2 b/roles/netbootxyz/templates/menu/boot.cfg.j2
index 76b15f94ea..d4c5844d80 100644
--- a/roles/netbootxyz/templates/menu/boot.cfg.j2
+++ b/roles/netbootxyz/templates/menu/boot.cfg.j2
@@ -20,7 +20,7 @@ isset ${sigs_enabled} || set sigs_enabled {{ sigs_enabled | default(false) | boo
 isset ${sigs} || set sigs {{ sigs_location }}
 
 # set location of latest iPXE
-isset ${ipxe_disk} || iseq ${platform} efi && set ipxe_disk netboot.xyz-snponly.efi || set ipxe_disk netboot.xyz-undionly.kpxe
+iseq ${platform} efi && set ipxe_disk netboot.xyz-snponly.efi || set ipxe_disk netboot.xyz-undionly.kpxe
 
 # set default boot timeout
 isset ${boot_timeout} || set boot_timeout {{ boot_timeout }}
@@ -41,51 +41,51 @@ isset {{ '${' + key + '_base_dir}' }} || set {{ key }}_base_dir {{ value.base_di
 # determine architectures and enable menu options
 #################################################
 :architectures
-isset ${menu_linux} || set menu_linux 1
-isset ${menu_bsd} || set menu_bsd 1
-isset ${menu_unix} || set menu_unix 1
-isset ${menu_freedos} || set menu_freedos 1
-isset ${menu_live} || set menu_live 1
-isset ${menu_pci} || set menu_pci 1
-isset ${menu_windows} || set menu_windows 1
-isset ${menu_utils} || set menu_utils 1
+set menu_linux 1
+set menu_bsd 1
+set menu_unix 1
+set menu_freedos 1
+set menu_live 1
+set menu_pci 1
+set menu_windows 1
+set menu_utils 1
 iseq ${arch} i386 && goto i386 ||
 iseq ${arch} x86_64 && goto x86_64 ||
 iseq ${arch} arm64 && goto arm64 ||
 goto architectures_end
 :x86_64
-isset ${menu_linux_i386} || set menu_linux_i386 0
+set menu_linux_i386 0
 iseq ${platform} efi && goto efi ||
 goto architectures_end
 :i386
-isset ${menu_linux} || set menu_linux 0
-isset ${menu_linux_i386} || set menu_linux_i386 1
-isset ${menu_bsd} || set menu_bsd 1
-isset ${menu_unix} || set menu_unix 0
-isset ${menu_freedos} || set menu_freedos 1
-isset ${menu_live} || set menu_live 0
-isset ${menu_windows} || set menu_windows 0
-isset ${menu_utils} || set menu_utils 1
+set menu_linux 0
+set menu_linux_i386 1
+set menu_bsd 1
+set menu_unix 0
+set menu_freedos 1
+set menu_live 0
+set menu_windows 0
+set menu_utils 1
 iseq ${platform} efi && goto efi ||
 goto architectures_end
 :arm64
-isset ${menu_linux} || set menu_linux 0
-isset ${menu_linux_arm} || set menu_linux_arm 1
-isset ${menu_unix} || set menu_unix 0
-isset ${menu_freedos} || set menu_freedos 0
-isset ${menu_live} || set menu_live 0
-isset ${menu_live_arm} || set menu_live_arm 1
-isset ${menu_windows} || set menu_windows 0
-isset ${menu_utils} || set menu_utils 0
-isset ${menu_utils_arm} || set menu_utils_arm 1
-isset ${menu_pci} || set menu_pci 0
+set menu_linux 0
+set menu_linux_arm 1
+set menu_unix 0
+set menu_freedos 0
+set menu_live 0
+set menu_live_arm 1
+set menu_windows 0
+set menu_utils 0
+set menu_utils_arm 1
+set menu_pci 0
 iseq ${platform} efi && goto efi ||
 goto architectures_end
 :efi
-isset ${menu_bsd} || set menu_bsd 1
-isset ${menu_freedos} || set menu_freedos 0
-isset ${menu_unix} || set menu_unix 0
-isset ${menu_pci} || set menu_pci 0
+set menu_bsd 1
+set menu_freedos 0
+set menu_unix 0
+set menu_pci 0
 goto architectures_end
 :architectures_end
 goto clouds
@@ -111,22 +111,22 @@ goto clouds_end
 
 :metal_x86_64
 isset ${cmdline} || set cmdline console=ttyS1,115200n8
-isset ${ipxe_disk} || iseq ${platform} efi && set ipxe_disk netboot.xyz-metal-snp.efi || set ipxe_disk netboot.xyz-metal.kpxe
-isset ${menu_linux_i386} || set menu_linux_i386 0
-isset ${menu_freedos} || set menu_freedos 0
-isset ${menu_windows} || set menu_windows 0
-isset ${menu_pci} || iseq ${platform} efi && set menu_pci 0 ||
+iseq ${platform} efi && set ipxe_disk netboot.xyz-metal-snp.efi || set ipxe_disk netboot.xyz-metal.kpxe
+set menu_linux_i386 0
+set menu_freedos 0
+set menu_windows 0
+iseq ${platform} efi && set menu_pci 0 ||
 goto clouds_end
 
 :metal_arm64
 isset ${cmdline} || set cmdline console=ttyAMA0,115200
-isset ${ipxe_disk} || set ipxe_disk netboot.xyz-metal-arm64-snp.efi
-isset ${menu_bsd} || set menu_bsd 1
-isset ${menu_freedos} || set menu_freedos 0
-isset ${menu_live} || set menu_live 0
-isset ${menu_windows} || set menu_windows 0
-isset ${menu_utils} || set menu_utils 0
-isset ${menu_pci} || set menu_pci 0
+set ipxe_disk netboot.xyz-metal-arm64-snp.efi
+set menu_bsd 1
+set menu_freedos 0
+set menu_live 0
+set menu_windows 0
+set menu_utils 0
+set menu_pci 0
 goto clouds_end
 
 :clouds_end
diff --git a/roles/netbootxyz/templates/menu/debian.ipxe.j2 b/roles/netbootxyz/templates/menu/debian.ipxe.j2
index d27f2f1052..305eb3c9b5 100644
--- a/roles/netbootxyz/templates/menu/debian.ipxe.j2
+++ b/roles/netbootxyz/templates/menu/debian.ipxe.j2
@@ -30,7 +30,7 @@ goto mirrorcfg
 
 :older_release
 set older_release true
-isset ${debian_mirror} || set debian_mirror {{ releases.debian.archive_mirror }}
+set debian_mirror {{ releases.debian.archive_mirror }}
 echo Setting mirror to ${debian_mirror}
 clear debian_version
 echo -n Please set enter code name of release: ${} && read debian_version
diff --git a/roles/netbootxyz/templates/menu/k3os.ipxe.j2 b/roles/netbootxyz/templates/menu/k3os.ipxe.j2
index 401dfb868d..43671d4cdb 100644
--- a/roles/netbootxyz/templates/menu/k3os.ipxe.j2
+++ b/roles/netbootxyz/templates/menu/k3os.ipxe.j2
@@ -10,7 +10,7 @@ goto ${menu} ||
 set os {{ releases.k3os.name }}
 set os_arch ${arch}
 iseq ${os_arch} x86_64 && set os_arch amd64 ||
-isset ${k3os_mirror} || set k3os_mirror {{ releases.k3os.mirror }}
+set k3os_mirror {{ releases.k3os.mirror }}
 isset ${k3os_version} || set k3os_version latest
 isset ${k3os_install_device} || set k3os_install_device /dev/sda
 menu ${os} by Rancher
diff --git a/roles/netbootxyz/templates/menu/tinycore.ipxe.j2 b/roles/netbootxyz/templates/menu/tinycore.ipxe.j2
index a4faa6c51c..e742fab293 100644
--- a/roles/netbootxyz/templates/menu/tinycore.ipxe.j2
+++ b/roles/netbootxyz/templates/menu/tinycore.ipxe.j2
@@ -3,7 +3,7 @@
 # Tiny Core Linux
 # http://tinycorelinux.net/downloads.html
 
-isset ${tinycore_mirror} || set tinycore_mirror {{ releases.tinycore.mirror }}
+set tinycore_mirror {{ releases.tinycore.mirror }}
 
 :arch_menu
 set os Tiny Core Linux
diff --git a/roles/netbootxyz/templates/menu/ubuntu.ipxe.j2 b/roles/netbootxyz/templates/menu/ubuntu.ipxe.j2
index 351bc2392e..d17bcb3874 100644
--- a/roles/netbootxyz/templates/menu/ubuntu.ipxe.j2
+++ b/roles/netbootxyz/templates/menu/ubuntu.ipxe.j2
@@ -33,7 +33,7 @@ goto mirrorcfg
 
 :older_release
 set older_release true
-isset ${ubuntu_mirror} || set ubuntu_mirror {{ releases.ubuntu.archive_mirror }}
+set ubuntu_mirror {{ releases.ubuntu.archive_mirror }}
 echo Setting mirror to ${ubuntu_mirror}
 clear ubuntu_version
 echo -n Please set enter code name of release: ${} && read ubuntu_version