build: remove references to unused c bindings of wasmtime

Before the changes intorducing the new wasmtime bindings we relied
on an downloaded static library libwasmtime.a. Now that the bindings
are introduced, we do not rely on it anymore, so all references to
it can be removed.

configure.py

@@ -44,16 +44,12 @@
 distro_extra_ldflags = ''
 distro_extra_cmake_args = []
 employ_ld_trickery = True
-has_wasmtime = False
-use_wasmtime_as_library = False
 
 # distro-specific setup
 def distro_setup_nix():
-    global os_ids, employ_ld_trickery, has_wasmtime, use_wasmtime_as_library
+    global os_ids, employ_ld_trickery
     os_ids = ['linux']
     employ_ld_trickery = False
-    has_wasmtime = True
-    use_wasmtime_as_library = True
 
 if os.environ.get('NIX_CC'):
         distro_setup_nix()

default.nix

@@ -152,7 +152,6 @@ in derive ({
     systemd
     thrift
     valgrind
-    wasmtime
     xorg.libpciaccess
     xxHash
     zlib

dist/nix/overlay.nix

@@ -18,9 +18,5 @@ in {
     doCheck = false;
   };
 
-  # use the ancient version 0.29 of wasmtime because Scylla does not
-  # build with newer ones
-  wasmtime = final.callPackage ./pkg/upstreamable/wasmtime { };
-
   scylla-driver = final.callPackage ./pkg/upstreamable/python-driver { };
 }

install-dependencies.sh

@@ -203,29 +203,6 @@ node_exporter_url() {
     echo "https://github.com/prometheus/node_exporter/releases/download/v$NODE_EXPORTER_VERSION/$(node_exporter_filename)"
 }
 
-WASMTIME_VERSION=0.29.0
-WASMTIME_DIR=/opt/scylladb/dependencies
-declare -A WASMTIME_CHECKSUM=(
-    ["x86_64"]=e94a9a768270e86e7f7eac1a68575bb1f287702822e83b14c3b04bf7e865a84c
-    ["aarch64"]=36a257aef36f5a0cabc8ce414e31ccede9c16ca996d6b07cb440a32aaa263164
-)
-
-wasmtime_filename() {
-    echo "wasmtime-v$WASMTIME_VERSION-$(arch)-linux-c-api.tar.xz"
-}
-
-wasmtime_fullpath() {
-    echo "$WASMTIME_DIR/$(wasmtime_filename)"
-}
-
-wasmtime_checksum() {
-    sha256sum "$(wasmtime_fullpath)" | while read -r sum _; do [[ "$sum" == "${WASMTIME_CHECKSUM["$(arch)"]}" ]]; done
-}
-
-wasmtime_url() {
-    echo "https://github.com/bytecodealliance/wasmtime/releases/download/v$WASMTIME_VERSION/$(wasmtime_filename)"
-}
-
 print_usage() {
     echo "Usage: install-dependencies.sh [OPTION]..."
     echo ""
@@ -329,23 +306,6 @@ elif [ "$ID" = "fedora" ]; then
             exit 1
         fi
     fi
-    if [ -f "$(wasmtime_fullpath)" ] && wasmtime_checksum; then
-        echo "$(wasmtime_filename) already exists, skipping download"
-    else
-        mkdir -p "$WASMTIME_DIR"
-        if curl --retry 5 -fSL -o "$(wasmtime_fullpath)" "$(wasmtime_url)"; then
-            if ! wasmtime_checksum; then
-                echo "$(wasmtime_filename) download failed, skipping"
-            else
-                ( cd $WASMTIME_DIR; tar xvf $(wasmtime_filename) )
-                wasmtime_unpacked=$(basename $(wasmtime_filename) .tar.xz)
-                cp $WASMTIME_DIR/$wasmtime_unpacked/lib/libwasmtime.a /usr/lib64/
-                cp -r $WASMTIME_DIR/$wasmtime_unpacked/include/was{m.h,i.h,mtime,mtime.h} /usr/local/include/
-            fi
-        else
-            echo "$(wasmtime_url) is unreachable, skipping"
-        fi
-    fi
 elif [ "$ID" = "centos" ]; then
     dnf install -y "${centos_packages[@]}"
     echo -e "Configure example:\n\tpython3.4 ./configure.py --enable-dpdk --mode=release --static-boost --compiler=/opt/scylladb/bin/g++-7.3 --python python3.4 --ldflag=-Wl,-rpath=/opt/scylladb/lib64 --cflags=-I/opt/scylladb/include --with-antlr3=/opt/scylladb/bin/antlr3"