From 9ecd274e4e3d7ed6b544aad78605ae1e580c8c88 Mon Sep 17 00:00:00 2001
From: Tulip Blossom <tulilirockz@proton.me>
Date: Wed, 19 Mar 2025 02:36:21 -0300
Subject: [PATCH] feat: add functional live ISO

---
 .gitignore             |  5 +++
 Justfile               | 95 ++++++++++++++++++++++++++++++++++++++++++
 README.md              | 25 ++++++++++-
 src/grub.cfg           | 21 ++++++++++
 src/xorriso_wrapper.sh |  3 ++
 5 files changed, 147 insertions(+), 2 deletions(-)
 create mode 100644 .gitignore
 create mode 100644 Justfile
 create mode 100644 src/grub.cfg
 create mode 100644 src/xorriso_wrapper.sh

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..373fad1
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+*.img
+rootfs
+*.raw
+*.iso
+work
diff --git a/Justfile b/Justfile
new file mode 100644
index 0000000..c01d3f9
--- /dev/null
+++ b/Justfile
@@ -0,0 +1,95 @@
+workdir := env("TITANOBOA_WORKDIR", "work")
+isoroot := env("TITANOBOA_ISO_ROOT", "work/iso-root")
+
+init-work:
+    mkdir -p {{ workdir }}
+    mkdir -p {{ isoroot }}
+
+initramfs $IMAGE: init-work
+    #!/usr/bin/env bash
+    # THIS NEEDS dracut-live
+    set -xeuo pipefail
+    sudo podman run --privileged --rm -it -v .:/tmp/test:Z $IMAGE \
+        sh -c '
+    set -xeuo pipefail
+    sudo dnf install -y dracut dracut-live kernel
+    INSTALLED_KERNEL=$(rpm -q kernel-core --queryformat "%{evr}.%{arch}" | tail -n 1)
+    cat >/tmp/fake-uname <<EOF
+    #!/usr/bin/env bash
+    
+    if [ "\$1" == "-r" ] ; then
+      echo ${INSTALLED_KERNEL}
+      exit 0
+    fi
+    
+    exec /usr/bin/uname \$@
+    EOF
+    install -Dm0755 /tmp/fake-uname /tmp/bin/uname
+    PATH=/tmp/bin:$PATH dracut --zstd --reproducible --no-hostonly --add dmsquash-live --add dmsquash-live-autooverlay --force /tmp/test/{{ workdir }}/initramfs.img'
+
+rootfs $IMAGE: init-work
+    #!/usr/bin/env bash
+    set -xeuo pipefail
+    ROOTFS="{{ workdir }}/rootfs"
+    mkdir -p $ROOTFS
+    sudo podman export "$(sudo podman create "${IMAGE}")" | tar -xf - -C "${ROOTFS}"
+
+squash $IMAGE: init-work
+    #!/usr/bin/env bash
+    set -xeuo pipefail
+    ROOTFS="{{ workdir }}/rootfs"
+    # Needs to be squashfs.img due to dracut default name (can be configured on grub.cfg)
+    if [ -e "{{ workdir }}/squashfs.img" ] ; then
+        exit 0
+    fi
+    sudo podman run --privileged --rm -it -v .:/tmp/test:Z -v "./${ROOTFS}:/rootfs:Z" "${IMAGE}" sh -c "
+    set -xeuo pipefail
+    sudo dnf install -y squashfs-tools
+    mksquashfs /rootfs /tmp/test/{{ workdir }}/squashfs.img"
+
+iso-organize: init-work
+    #!/usr/bin/env bash
+    set -xeuo pipefail
+    mkdir -p {{ isoroot }}/boot/grub {{ isoroot }}/LiveOS
+    cp src/grub.cfg {{ isoroot }}/boot/grub
+    cp {{ workdir }}/rootfs/lib/modules/*/vmlinuz {{ isoroot }}/boot
+    sudo cp {{ workdir }}/initramfs.img {{ isoroot }}/boot
+    sudo mv {{ workdir }}/squashfs.img {{ isoroot }}/LiveOS/squashfs.img
+
+iso $IMAGE:
+    #!/usr/bin/env bash
+    # grub2 grub2-tools-extra xorriso
+    set -xeuo pipefail
+    sudo podman run --privileged --rm -it -v .:/tmp/test:Z registry.fedoraproject.org/fedora:41 \
+        sh -c "
+    set -xeuo pipefail
+    sudo dnf install -y grub2 grub2-tools-extra xorriso
+    grub2-mkrescue --xorriso=/tmp/test/src/xorriso_wrapper.sh -o /tmp/test/output.iso /tmp/test/{{ isoroot }}"
+
+build $IMAGE:
+    #!/usr/bin/env bash
+    set -xeuo pipefail
+    just clean
+    just initramfs "${IMAGE}"
+    just rootfs "${IMAGE}"
+    just squash "${IMAGE}"
+    just iso-organize
+    just iso "${IMAGE}"
+
+clean:
+    rm -rf {{ workdir }}
+    rm -rf output.iso
+
+vm *ARGS:
+    #!/usr/bin/env bash
+    flatpak run "--command=qemu-system-$(arch)" org.virt_manager.virt-manager \
+        -enable-kvm \
+        -M q35 \
+        -cpu host \
+        -smp 1 \
+        -m 4G \
+        -net nic,model=virtio \
+        -net user,hostfwd=tcp::2222-:22 \
+        -display gtk \
+        -boot d \
+        -cdrom {{ ARGS }}
diff --git a/README.md b/README.md
index 4cbef65..d29af9f 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,23 @@
-# titanoboa
-Eats anacondas
+# Titanoboa (Alpha)
+
+A [bootc](https://github.com/bootc-dev/bootc) installer that eats anacondas.
+
+This is an experiment to see how far we can get building our own ISOs
+
+The objective is to:
+- Make our own ISO from scratch
+- Have it booting a live bootc ISO
+- Install any image off of that
+
+## Building a Live ISO
+
+```bash
+just build ghcr.io/ublue-os/bluefin:lts
+just vm ./output.iso
+```
+
+## TODO
+- [ ] Include flatpaks in the rootfs
+- [ ] Include `/var/lib/containers` in the rootfs
+- [ ] Have an installer for the Live ISO
+- [ ] Different names for each image
diff --git a/src/grub.cfg b/src/grub.cfg
new file mode 100644
index 0000000..c4bb76d
--- /dev/null
+++ b/src/grub.cfg
@@ -0,0 +1,21 @@
+set default="1"
+
+function load_video {
+  insmod all_video
+}
+
+load_video
+set gfxpayload=keep
+insmod gzio
+insmod part_gpt
+# insmod ext2
+# insmod chain
+
+set timeout=60
+
+search --no-floppy --set=root -l 'bluefin_boot'
+
+menuentry 'Install Bluefin LTS' --class fedora --class gnu-linux --class gnu --class os {
+	linux ($root)/boot/vmlinuz quiet rhgb root=live:CDLABEL=bluefin_boot enforcing=0 rd.live.image
+	initrd ($root)/boot/initramfs.img
+}
diff --git a/src/xorriso_wrapper.sh b/src/xorriso_wrapper.sh
new file mode 100644
index 0000000..ad2bc73
--- /dev/null
+++ b/src/xorriso_wrapper.sh
@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+xorriso $@ -iso-level 4 -V "bluefin_boot"