diff --git a/docs/config.md b/docs/config.md
index a6785f6..708ad94 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -86,6 +86,34 @@ Example configuration:
 "device": "/dev/nvme0n1"
 ```
 ---
+### `partitions`
+
+This declares partitions map.
+Required in `HEADLESS` mode!
+
+The `partitions` provide information, which will be used
+during the partition and mount steps.
+
+There is no default for this option.
+
+Example configuration:
+```json
+"partitions": [
+    {
+        "name": "/dev/nvme0n1p3",
+        "mountpoint": "/",
+        "size": "450G",
+        "type": "root"
+    },
+    {
+        "name": "/dev/nvme0n1p1",
+        "mountpoint": "/boot",
+        "size": "512M",
+        "type": "boot"
+    }
+]
+```
+---
 ### `fs_name`
 
 This sets the target device filesystem.
diff --git a/settings.json b/settings.json
index 61d99d5..0163f01 100644
--- a/settings.json
+++ b/settings.json
@@ -3,6 +3,20 @@
     "headless_mode": false,
     "device": "/dev/nvme0n1",
     "fs_name": "btrfs",
+    "partitions": [
+        {
+            "name": "/dev/nvme0n1p3",
+            "mountpoint": "/",
+            "size": "450G",
+            "type": "root"
+        },
+        {
+            "name": "/dev/nvme0n1p1",
+            "mountpoint": "/boot",
+            "size": "512M",
+            "type": "boot"
+        }
+    ],
     "hostname": "cachyos",
     "locale": "en_US",
     "xkbmap": "us",
diff --git a/src/config.cpp b/src/config.cpp
index 110449d..498975b 100644
--- a/src/config.cpp
+++ b/src/config.cpp
@@ -35,6 +35,7 @@ bool Config::initialize() noexcept {
         s_config->m_data["LVM"]          = 0;
         s_config->m_data["LVM_LV_NAME"]  = "";  // Name of LV to create or use
         s_config->m_data["LVM_SEP_BOOT"] = 0;
+        s_config->m_data["READY_PARTITIONS"] = std::vector<std::string>{};
 
         // Mounting
         s_config->m_data["MOUNTPOINT"] = "/mnt";
diff --git a/src/simple_tui.cpp b/src/simple_tui.cpp
index 68f8025..6807f48 100644
--- a/src/simple_tui.cpp
+++ b/src/simple_tui.cpp
@@ -103,6 +103,7 @@ void menu_simple() noexcept {
     const auto& device_info     = std::get<std::string>(config_data["DEVICE"]);
     const auto& fs_name         = std::get<std::string>(config_data["FILESYSTEM_NAME"]);
     const auto& mount_opts_info = std::get<std::string>(config_data["MOUNT_OPTS"]);
+    const auto& ready_parts     = std::get<std::vector<std::string>>(config_data["READY_PARTITIONS"]);
 
     const auto& hostname = std::get<std::string>(config_data["HOSTNAME"]);
     const auto& locale   = std::get<std::string>(config_data["LOCALE"]);
diff --git a/src/utils.cpp b/src/utils.cpp
index 086c0ea..2c70aa4 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -1537,7 +1537,7 @@ void install_cachyos_repo() noexcept {
         spdlog::info("{} is supported", isa_level);
 
         const auto& repo_list = detail::pacmanconf::get_repo_list("/etc/pacman.conf");
-        if (ranges::contains(repo_list, fmt::format("[{}]", repo_name))) {
+        if (ranges::contains(repo_list, fmt::format(FMT_COMPILE("[{}]"), repo_name))) {
             spdlog::info("'{}' is already added!", repo_name);
             return;
         }
@@ -1775,6 +1775,40 @@ bool parse_config() noexcept {
         return false;
     }
 
+    if (doc.HasMember("partitions")) {
+        assert(doc["partitions"].IsArray());
+
+        std::vector<std::string> ready_parts{};
+        for (const auto& partition_map : doc["partitions"].GetArray()) {
+            assert(partition_map.IsObject());
+
+            const auto& part_obj = partition_map.GetObject();
+            assert(partition_map["name"].IsString());
+            assert(partition_map["mountpoint"].IsString());
+            assert(partition_map["size"].IsString());
+            assert(partition_map["type"].IsString());
+
+            // Validate partition type.
+            const auto& part_type = std::string{partition_map["type"].GetString()};
+
+            using namespace std::literals;
+            static constexpr std::array valid_types{"root"sv, "boot"sv, "additional"sv};
+            if (!ranges::contains(valid_types, part_type)) {
+                fmt::print(stderr, "partition type '{}' is invalid! Valid types: {}.\n", part_type, valid_types);
+                return false;
+            }
+
+            // Just to save some space push as single string instead of a new type.
+            auto&& part_data = fmt::format(FMT_COMPILE("{}\t{}\t{}\t{}"), partition_map["name"].GetString(),
+                partition_map["mountpoint"].GetString(), partition_map["size"].GetString(), part_type);
+            ready_parts.push_back(std::move(part_data));
+        }
+        config_data["READY_PARTITIONS"] = std::move(ready_parts);
+    } else if (headless_mode) {
+        fmt::print(stderr, "\"partitions\" field is required in HEADLESS mode!\n");
+        return false;
+    }
+
     if (doc.HasMember("fs_name")) {
         assert(doc["fs_name"].IsString());
         config_data["FILESYSTEM_NAME"] = std::string{doc["fs_name"].GetString()};