1 files changed, 36 insertions, 0 deletions
diff --git a/mkosi.images/system/mkosi.sync b/mkosi.images/system/mkosi.sync
new file mode 100755
index 0000000..d21ecd1
--- /dev/null
+++ b/mkosi.images/system/mkosi.sync
@@ -0,0 +1,36 @@
+#!/bin/bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+set -e
+set -o nounset
+
+if ((${NO_SYNC:-0})); then
+    exit 0
+fi
+
+PKG_SUBDIR="$(realpath --canonicalize-missing "pkg/$DISTRIBUTION" --relative-to "$PWD")"
+
+if [[ -d "$PKG_SUBDIR/.git" ]] && [[ "$(git -C "$PKG_SUBDIR" rev-parse HEAD)" == "$GIT_COMMIT" ]]; then
+    exit 0
+fi
+
+# The repository on Salsa has the full upstream sources, so it's a waste of space to
+# redownload and duplicate everything, so do a sparse checkout as we only need the
+# packaging directory anyway
+if [[ -n "${GIT_SUBDIR:-}" ]]; then
+    sparse=(--no-checkout --filter=tree:0)
+else
+    sparse=()
+fi
+
+if [[ ! -e "$PKG_SUBDIR" ]] || [[ -z "$(ls --almost-all "$PKG_SUBDIR")" ]]; then
+    git clone "$GIT_URL" --branch "$GIT_BRANCH" "${sparse[@]}" "$PKG_SUBDIR"
+    if [[ -n "${GIT_SUBDIR:-}" ]]; then
+        # --no-cone is needed to check out only one top-level directory
+        git -C "$PKG_SUBDIR" sparse-checkout set --no-cone "${GIT_SUBDIR:-}"
+    fi
+else
+    git -C "$PKG_SUBDIR" remote set-url origin "$GIT_URL"
+    git -C "$PKG_SUBDIR" fetch origin "$GIT_BRANCH"
+fi
+
+git -C "$PKG_SUBDIR" -c advice.detachedHead=false checkout "$GIT_COMMIT"