CI Linux SDL: consolidate

add all to one script with deps/build_install/install_cached actions

- yml - use action @main
- cache: do not depend .github/scripts/Linux/prepare.sh, just the
catch-all SDL install file
- build SDL,SDL_ttf without entering the dir (as fluidsynth already does)

Author: MartinPulec

.github/scripts/Linux/common.sh

@@ -0,0 +1,6 @@
+# $2 - pattern to exclude; separate packates with '\|' (BRE alternation)
+get_build_deps_excl() {
+        apt-cache showsrc "$1" | sed -n "/^Build-Depends:/\
+{s/Build-Depends://;p;q}" | tr ',' '\n' | cut -f 2 -d\  | grep -v "$2"
+}
+

.github/scripts/Linux/download_build_sdl.sh

@@ -1,7 +1,49 @@
 #!/bin/sh -eu
 
-cd /var/tmp/sdl
-sudo cmake --install SDL/build
-sudo cmake --install SDL_ttf/build
-sudo cmake --install fluidsynth/build
+dir=$(dirname "$0")
+# shellcheck source=/dev/null
+. "$dir/common.sh" # for get_build_deps_excl
 
+# build dir that will be restored from cache
+cache_dir=/var/tmp/sdl
+
+# install the deps - runs always (regardless the cache)
+deps() {
+        sudo apt build-dep libsdl2
+        fluidsynth_build_dep=$(get_build_deps_excl libfluidsynth3 libsdl2-dev)
+        sdl2_ttf_build_dep=$(get_build_deps_excl libsdl2-ttf libsdl2-dev)
+        # shellcheck disable=SC2086 # intentional
+        sudo apt install $fluidsynth_build_dep $sdl2_ttf_build_dep
+}
+
+# build SDL, SDL_ttf and fluidsynth and also install them
+build_install() {
+        mkdir -p $cache_dir
+        cd $cache_dir
+
+        git clone --depth 1 https://github.com/libsdl-org/SDL
+        cmake -S SDL -B SDL/build
+        cmake --build SDL/build -j "$(nproc)"
+        sudo cmake --install SDL/build
+
+        git clone --depth 1 https://github.com/libsdl-org/SDL_ttf
+        cmake -S SDL_ttf -B SDL_ttf/build
+        cmake --build SDL_ttf/build -j "$(nproc)"
+        sudo cmake --install SDL_ttf/build
+
+        git clone --recurse-submodules --depth 1\
+         https://github.com/Fluidsynth/fluidsynth
+        cmake -S fluidsynth -B fluidsynth/build
+        cmake --build fluidsynth/build -j "$(nproc)"
+        sudo cmake --install fluidsynth/build
+}
+
+# if cache is successfully restored, just install the builds
+install_cached() {
+        cd $cache_dir
+        sudo cmake --install SDL/build
+        sudo cmake --install SDL_ttf/build
+        sudo cmake --install fluidsynth/build
+}
+
+"${1?action required!}"

.github/scripts/Linux/install_sdl.sh

@@ -1,5 +1,9 @@
 #!/bin/bash -eux
 
+dir=$(dirname "$0")
+# shellcheck source=/dev/null
+. "$dir/common.sh" # for get_build_deps_excl
+
 export PKG_CONFIG_PATH=/usr/local/qt/lib/pkgconfig:/usr/local/lib/pkgconfig
 export LIBRARY_PATH=/usr/local/lib:/usr/local/qt/lib
 printf "%b" "\
@@ -33,15 +37,7 @@ sudo apt install libopencv-core-dev libopencv-imgproc-dev
 sudo apt install libcurl4-openssl-dev # for RTSP client (vidcap)
 sudo apt install i965-va-driver-shaders libva-dev # instead of i965-va-driver
 
-get_build_deps_excl() { # $2 - pattern to exclude; separate packates with '\|' (BRE alternation)
-        apt-cache showsrc "$1" | sed -n '/^Build-Depends:/{s/Build-Depends://;p;q}' | tr ',' '\n' | cut -f 2 -d\  | grep -v "$2"
-}
-
-sudo apt build-dep libsdl2
-fluidsynth_build_dep=$(get_build_deps_excl libfluidsynth3 libsdl2-dev)
-sdl2_ttf_build_dep=$(get_build_deps_excl libsdl2-ttf libsdl2-dev)
-# shellcheck disable=SC2086 # intentional
-sudo apt install $fluidsynth_build_dep $sdl2_ttf_build_dep
+"$dir/install_sdl.sh" deps
 
 ffmpeg_build_dep=$(get_build_deps_excl ffmpeg 'libsdl')
 # shellcheck disable=SC2086 # intentional

.github/scripts/Linux/prepare.sh

@@ -93,16 +93,16 @@ jobs:
       run: .github/scripts/Linux/install_ffmpeg.sh
     - name: Cache SDL
       id: cache-sdl
-      uses: actions/cache@v3
+      uses: actions/cache@main
       with:
         path: '/var/tmp/sdl'
-        key: cache-sdl-${{ runner.os }}-${{ hashFiles( '.github/scripts/Linux/prepare.sh', '.github/scripts/Linux/download_build_sdl.sh' ) }}
+        key: cache-sdl-${{ runner.os }}-${{ hashFiles( '.github/scripts/Linux/install_sdl.sh' ) }}
     - name: Build SDL
       if: steps.cache-sdl.outputs.cache-hit != 'true'
-      run: .github/scripts/Linux/download_build_sdl.sh
+      run: .github/scripts/Linux/install_sdl.sh build_install
     - name: Install Cached SDL
       if: steps.cache-sdl.outputs.cache-hit == 'true'
-      run: .github/scripts/Linux/install_sdl.sh
+      run: .github/scripts/Linux/install_sdl.sh install_cached
     - name: configure
       run: "./autogen.sh $FEATURES || { RC=$?; cat config.log; exit $RC; }"
     - name: make