From a9a8cc2da85c842972d780326e85bf94bf0e0502 Mon Sep 17 00:00:00 2001
From: Zeglius <33781398+Zeglius@users.noreply.github.com>
Date: Sat, 21 Jun 2025 19:35:53 +0200
Subject: [PATCH] feat: Bind mount podman container storage to btrfs loopback

This allows building more space demanding images

Signed-off-by: Zeglius <33781398+Zeglius@users.noreply.github.com>
---
 .github/workflows/build.yml      |  3 +++
 .github/workflows/mount_btrfs.sh | 44 ++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100755 .github/workflows/mount_btrfs.sh

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index db95edd8..0ce7076e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -51,6 +51,9 @@ jobs:
       #   uses: ublue-os/remove-unwanted-software@517622d6452028f266b7ba4cc9a123b5f58a6b53 # v7
       #   with:
       #     remove-codeql: true
+
+      - name: Mount BTRFS for podman storage
+        run: ${{ github.workspace }}/.github/workflows/mount_btrfs.sh
       
       - name: Get current date
         id: date
diff --git a/.github/workflows/mount_btrfs.sh b/.github/workflows/mount_btrfs.sh
new file mode 100755
index 00000000..702c6744
--- /dev/null
+++ b/.github/workflows/mount_btrfs.sh
@@ -0,0 +1,44 @@
+#!/bin/bash
+
+set -eo pipefail
+
+BTRFS_TARGET_DIR="${BTRFS_TARGET_DIR:-$(
+    dir=$(podman system info --format '{{.Store.GraphRoot}}' | sed 's|/storage$||')
+    mkdir -p "$dir"
+    echo "$dir"
+)}"
+# Options used to mount
+BTRFS_MOUNT_OPTS=${BTRFS_MOUNT_OPTS:-"compress-force=zstd:2"}
+# Location where the loopback file will be placed.
+_BTRFS_LOOPBACK_FILE=${_BTRFS_LOOPBACK_FILE:-/mnt/btrfs_loopbacks/$(systemd-escape -p "$BTRFS_TARGET_DIR")}
+# Percentage of the total space to use. Max: 1.0, Min: 0.0
+_BTRFS_LOOPBACK_FREE=${_BTRFS_LOOPBACK_FREE:-"0.8"}
+
+# Result of $(dirname "$_BTRFS_LOOPBACK_FILE")
+btrfs_pdir="$(dirname "$_BTRFS_LOOPBACK_FILE")"
+
+# Install btrfs-progs
+sudo apt-get install -y btrfs-progs
+
+# Create loopback file
+sudo mkdir -p "$btrfs_pdir" && sudo chown "$(id -u)":"$(id -g)" "$btrfs_pdir"
+_final_size=$(
+    findmnt --target "$btrfs_pdir" --bytes --df --json |
+        jq -r --arg freeperc "$_BTRFS_LOOPBACK_FREE" \
+            '.filesystems[0].avail * ($freeperc | tonumber) | round'
+)
+truncate -s "$_final_size" "$_BTRFS_LOOPBACK_FILE"
+unset -v _final_size
+
+# # Stop docker services
+# sudo systemctl stop docker
+
+# Format btrfs loopback
+sudo mkfs.btrfs -r "$BTRFS_TARGET_DIR" "$_BTRFS_LOOPBACK_FILE"
+
+# Mount
+sudo systemd-mount "$_BTRFS_LOOPBACK_FILE" "$BTRFS_TARGET_DIR" \
+    ${BTRFS_MOUNT_OPTS:+ --options="${BTRFS_MOUNT_OPTS}"}
+
+# # Restart docker services
+# sudo systemctl start docker