Fix riscv64gc-unknown-linux-gnu target

Fix #1423

.changes/1525.json

@@ -0,0 +1,5 @@
+{
+    "description": "Fix riscv64gc-unknown-linux-gnu target",
+    "issues": [1423],
+    "type": "fixed"
+}

docker/Dockerfile.riscv64gc-unknown-linux-gnu

@@ -1,4 +1,4 @@
-FROM ubuntu:20.04 as cross-base
+FROM ubuntu:22.04 as cross-base
 ENV DEBIAN_FRONTEND=noninteractive
 
 COPY common.sh lib.sh /

docker/lib.sh

@@ -54,6 +54,18 @@ if_ubuntu() {
     fi
 }
 
+if_ubuntu_ge() {
+    if grep -q -i ubuntu /etc/os-release; then
+        local ver
+        ver="$(source /etc/os-release; echo $VERSION_ID)"
+        if dpkg --compare-versions "$ver" "ge" "$1"; then
+            shift
+            eval "${@}"
+        fi
+    fi
+}
+
+
 GNU_MIRRORS=(
     "https://ftp.gnu.org/gnu/"
     "https://ftpmirror.gnu.org/"

docker/qemu.sh

@@ -29,6 +29,10 @@ build_static_libffi () {
 build_static_libmount () {
     local version_spec=2.23.2
     local version=2.23
+
+    if_ubuntu_ge 22.04 version_spec=2.37.2
+    if_ubuntu_ge 22.04 version=2.37
+
     local td
     td="$(mktemp -d)"
 
@@ -191,6 +195,9 @@ main() {
         libselinux1-dev \
         zlib1g-dev
 
+    # ubuntu no longer provides statically linked libmount
+    if_ubuntu_ge 22.04 build_static_libmount
+
     # if we have python3.6+, we can install qemu 7.0.0, which needs ninja-build
     # ubuntu 16.04 only provides python3.5, so remove when we have a newer qemu.
     is_ge_python36=$(python3 -c "import sys; print(int(sys.version_info >= (3, 6)))")