README.md

@@ -13,17 +13,20 @@ required (though the name remains).
 
 ### Prerequisites
 
-While not depending on it directly, this tool expects that you already set up
+This tool expects that you already set up snapper. It also expects that each
-snapper. It expects, that each snapshot contains its kernel
+snapshots linux and initramfs files (`/boot/vmlinuz-linux` and
-(`/boot/vmlinuz-linux`) and initramfs (`/boot/intitramfs-linux.img`), as well as
+`/boot/initramfs-linux.img`) as well as a kernel command line file
-a kernel command line file (`/etc/snap-pac-uki/kernel-cmd`).
+(`/etc/snap-pac-uki/kernel-cmd`) are available within each snapshot.
 
-For generating the current and fallback UKIs, the kernel and initramfs files of
+The fallback initramfs (`/boot/initramfs-linux-fallback.img`) and fallback
-the currently running system are used. For a kernel cmd, it uses
+command line file (`/etc/snap-pac-uki/kernel-cmd-fallback`) are only required
-`/etc/snap-pac-uki/kernel-cmd-current` and `/etc/snap-pac-uki/kernel-cmd-fallback`.
+on the current system.
 
-If you want to boot a UKI directly, use the `efibootmgr` command to create an
+Also the current command line file (`/etc/snap-pac-uki/kernel-cmd-current`)
-entry.
+needs is only required on the current system.
+
+EFI boot options are only created for each snapshot. If you want the UKIs
+created for the current system, you'll need to add boot entries yourself:
 
 ```bash
 # template
@@ -53,7 +56,7 @@ efibootmgr -c \
 1. You can install the dependencies of this program with the following command:
 
    ```bash
-   pacman -S fish ripgrep sbsigntools sed
+   pacman -S fish efibootmgr jq ripgrep sbsigntools sed snapper
    ```
 
 2. Download the latest release from [here][releases] and unpack it.

src/config.fish

@@ -2,7 +2,7 @@ function config -d "sets some configuration variables"
 
     # If this is not set to "yes", snap-pac-uki will not do anything when
     # executed.
-    #
+
     # This is to make sure that this program can be installed with pacman. If
     # this wasn't done, pacman would install this program with an default
     # config, which most likely wouldn't work correctly. Therefore this needs
@@ -21,6 +21,21 @@ function config -d "sets some configuration variables"
     # images.
     set -g CFG_DEFAULT_SUBVOL "@"
 
+    # Wheter to add a new EFI entry for a new snapshot uki
+    set -g CFG_EFI "yes"
+
+    # The device the EFI partition resides on
+    set -g CFG_EFI_DEV "/dev/nvme0n1"
+
+    # The "efi directory" that will contain the ukis
+    set -g CFG_EFI_PATH "\EFI\Linux"
+
+    # The efi partitions number on the device
+    set -g CFG_EFI_PART "1"
+
+    # The snapper config name
+    set -g CFG_SNAPSHOT_CONFIG "root"
+
     # The linux fs path containing all snapshot data
     set -g CFG_SNAPSHOT_PATH "/.snapshots"
 

src/snap-pac-uki.fish

@@ -7,8 +7,10 @@ end
 
 function check_deps -d "checks if all dependencies are available"
     set -l dependencies \
+        "jq" \
         "rg" \
         "sed" \
+        "snapper" \
 
     for dep in $dependencies
         which $dep >/dev/null 2>/dev/null
@@ -18,6 +20,12 @@ function check_deps -d "checks if all dependencies are available"
         end
     end
 
+    which "efibootmgr" >/dev/null 2>/dev/null
+    if test $status != "0" -a $CFG_EFI = "yes"
+        set -g CFG_EFI "no"
+        echo "CFG_EFI overwriten to \"no\": 'efibootmgr' not available"
+    end
+
     which "sbsign" >/dev/null 2>/dev/null
     if test $status != "0" -a $CFG_SECUREBOOT = "yes"
         set -g CFG_SECUREBOOT "no"
@@ -25,11 +33,11 @@ function check_deps -d "checks if all dependencies are available"
     end
 end
 
-function find_ukiless_snapshots -d "find"
+function find_tasks -d "finds out what the program needs to do"
     set -ge TASK_UKI
 
-    for id in (ls $CFG_SNAPSHOT_PATH)
+    for id in (snapper -c $CFG_SNAPSHOT_CONFIG --jsonout ls | jq ".$CFG_SNAPSHOT_CONFIG [] | .number")
-        if test $id = "0"
+        if test "$id" = "0"
             continue
         end
 
@@ -58,7 +66,16 @@ function create_uki -d "creates a new uki" -a variant id
     end
 
     # create initrd
+    set amd "$prefix/boot/amd-ucode.img"
+    set intel "$prefix/boot/intel-ucode.img"
     set initrd "$bd/initramfs-linux$fallback.img"
+
+    if test -f $amd
+        cat $amd >> $initrd
+    end
+    if test -f $intel
+        cat $intel >> $initrd
+    end
     cat "$prefix/boot/initramfs-linux$fallback.img" >> $initrd
 
     # create uki
@@ -122,13 +139,19 @@ function create_current_uki -d "creates an uki for the current system"
     create_uki fallback
 end
 
+function add_efi_entry -d "adds an efi boot entry for a snapshot uki" -a id
+    efibootmgr -q -C -d $CFG_EFI_DEV -p $CFG_EFI_PART \
+        -l "$CFG_EFI_PATH\arch-linux-$id.efi" \
+        -L "Arch Linux (Snapshot $id)"
+end
+
 function main
     # prepare for execution
     source "/etc/snap-pac-uki/config.fish"
     config
 
     if test "$CFG_ENABLED" != "yes"
-        echo "==> snap-pac-uki not enabled in config file" 1>&2
+        echo "not enabled in config file" 1>&2
         exit 0
     end
     
@@ -136,7 +159,7 @@ function main
 
     switch $argv[1]
         case "snapshots"
-            find_ukiless_snapshots
+            find_tasks
             for id in $TASK_UKI
                 echo "==> found snapshot without uki: $id"
 
@@ -145,6 +168,11 @@ function main
 
                 cp "$CFG_BUILD_DIR/$id/arch-linux-$id.efi" "$CFG_UKI_DIR"
                 echo "  -> copied uki for snapshot $id into uki directory"
+
+                if test "$CFG_EFI" = "yes"
+                    add_efi_entry $id
+                    echo "  -> created efi boot entry for uki of snapshot $id"
+                end
             end
 
         case "current"
@@ -160,11 +188,15 @@ function main
         case "clean"
             echo "==> cleaning ukis"
 
-            set ids (ls $CFG_SNAPSHOT_PATH)
+            set ids (snapper -c $CFG_SNAPSHOT_CONFIG --jsonout ls | jq ".$CFG_SNAPSHOT_CONFIG [] | .number")
             for uki in (ls "$CFG_UKI_DIR" | rg "[0-9]" | sed "s/arch-linux-\([0-9]*\).efi/\1/")
                 if not contains "$uki" $ids
                     echo "  -> cleaning uki and boot entry for removed snapshot $uki"
                     rm "$CFG_UKI_DIR/arch-linux-$uki.efi"
+
+                    if test "$CFG_EFI" = "yes"
+                        efibootmgr -q -b (efibootmgr -v | rg "arch-linux-$uki.efi" | sed "s/\*//;s/Boot0*\(.*\) Arch .*/\1/") -B
+                    end
                 end
             end