Add mesa snapshot overlay

overlay-debs/mesa-snapshot/mesa-snapshot.sh

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+#! /bin/sh
+#
+# Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+# SPDX-License-Identifier: BSD-3-Clause
+
+COMMIT=${COMMIT:-origin/main}
+
+set -e
+
+DEB_FILE=${DSC_FILE%%.dsc}.debian.tar.xz
+ORIG_FILE=$(echo ${DSC_FILE} | sed -e 's/-.*/.orig.tar.xz/')
+
+rm -rf mesa
+git clone --depth 1 https://gitlab.freedesktop.org/mesa/mesa
+
+cd mesa
+git fetch --depth 1 origin ${COMMIT##origin/}
+
+date=$(git log -1 --format=%cd --date=format:%Y%m%d ${COMMIT})
+subject=$(git log -1 --format="%h (\"%s\")" ${COMMIT})
+version=25.2.0~git${date}
+
+rm -rf ../mesa-${version}
+mkdir ../mesa-${version}
+git archive --format=tar HEAD | tar x -C ../mesa-${version}
+
+cd ../mesa-${version}
+
+rm -rf debian
+tar xJf ${DEB_FILE}
+
+cat >> debian/changelog.tmp << EOF
+mesa (${version}-0) experimental; urgency=medium
+
+  * Build git version from ${date}, commit ${subject}
+
+ -- Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>  Wed, 11 Jun 2025 14:58:50 +0300
+
+EOF
+cat debian/changelog >> debian/changelog.tmp
+mv debian/changelog.tmp debian/changelog
+
+# orig.tar.xz generation skips all .git* files, drop them from the source dir too.
+rm -rf .git*
+
+debian/rules regen_control
+debian/rules clean
+debian/rules gentarball
+
+rm -rf ../mesa
+
+rm ${DSC_FILE} ${DEB_FILE} ${ORIG_FILE}*

overlay-debs/mesa-snapshot/mesa-snapshot.yaml

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+dsc_url: "https://snapshot.debian.org/archive/debian/20250519T203618Z/pool/main/m/mesa/mesa_25.1.0-1.dsc"
+dsc_sha256sum: "d06c1b0ee300f096de2ac59a2e9583349ca79322612f4502baa5e78ff0be4290"
+debdiff_file: "mesa_25.2.0.debdiff"
+script: mesa-snapshot.sh
+suite: trixie
+env:
+  COMMIT: 8d13fc447e346477bab7e1b587c55fe0451ee654