Remove build.sh conditional check for nvidia-cuda-toolkit and enforce it into debian-forky

Author: raulcd

dev/tasks/linux-packages/apache-arrow/apt/debian-forky/Dockerfile

@@ -88,3 +88,8 @@ RUN \
     apt install -y -V ${quiet} nvidia-cuda-toolkit; \
   fi && \
   apt clean
+
+# nvidia-cuda-toolkit was removed from Debian forky amd64, so disable the
+# CUDA packages via the pkg.apache-arrow.nocuda build profile.See GH-50090.
+# Once nvidia-cuda-toolkit is re-added to Debian forky, this can be removed.
+ENV DEB_BUILD_PROFILES=pkg.apache-arrow.nocuda

dev/tasks/linux-packages/apache-arrow/debian/control.in

@@ -31,8 +31,9 @@ Build-Depends:
   ninja-build,
   nlohmann-json-dev | nlohmann-json3-dev,
 # nvidia-cuda-toolkit may be unavailable (e.g. removed from Debian forky).
-# apt/build.sh enables the pkg.apache-arrow.nocuda profile in that case so
-# this build dependency and the CUDA packages below are skipped.
+# The pkg.apache-arrow.nocuda build profile (set via DEB_BUILD_PROFILES, e.g.
+# in the debian-forky Dockerfile) skips this build dependency and the CUDA
+# packages below.
   nvidia-cuda-toolkit [!arm64] <!pkg.apache-arrow.nocuda>,
   pkg-config,
   protobuf-compiler,

dev/tasks/linux-packages/apt/build.sh

@@ -119,15 +119,6 @@ fi
 : ${DEB_BUILD_OPTIONS:="parallel=$(nproc)"}
 # DEB_BUILD_OPTIONS="${DEB_BUILD_OPTIONS} noopt"
 export DEB_BUILD_OPTIONS
-# nvidia-cuda-toolkit may be unavailable (e.g. it was removed from Debian
-# forky). Disable the CUDA packages via the pkg.apache-arrow.nocuda build
-# profile when it isn't installed. debian/rules disables ARROW_CUDA the
-# same way. See GH-50090.
-if ! dpkg -l nvidia-cuda-toolkit > /dev/null 2>&1; then
-  DEB_BUILD_PROFILES="${DEB_BUILD_PROFILES:-} pkg.apache-arrow.nocuda"
-  export DEB_BUILD_PROFILES
-  debuild_options+=(-eDEB_BUILD_PROFILES)
-fi
 df -h
 if [ "${DEBUG:-no}" = "yes" ]; then
   run debuild "${debuild_options[@]}" "${dpkg_buildpackage_options[@]}"