ENH: Compile git with SSL support

Older versions of git included in older linux distributions are not able
to download source from Github. A newer version is required with a newer
OpenSSL. This requires to also build curl with the same OpenSSL.

CMake is downloaded precompiled if available (64bits system) or compiled
from source otherwise.

imagefiles/build-and-install-cmake.sh

@@ -0,0 +1,89 @@
+#!/bin/bash
+#
+#  * build directory is /usr/src/CMake
+#
+#  * install directory is /usr
+#
+#  * after installation, archive, source and build directories are removed
+#
+set -ex
+
+WRAPPER=""
+
+while [ $# -gt 0 ]; do
+  case "$1" in
+    -32)
+      WRAPPER="linux32"
+      ;;
+    *)
+      echo "Usage: Usage: ${0##*/} [-32]"
+      exit 1
+      ;;
+  esac
+  shift
+done
+
+if ! command -v git &> /dev/null; then
+	echo >&2 'error: "git" not found!'
+	exit 1
+fi
+
+if [[ "${CMAKE_VERSION}" == "" ]]; then
+  echo >&2 'error: CMAKE_VERSION env. variable must be set to a non-empty value'
+  exit 1
+fi
+
+cd /usr/src
+
+git clone git://cmake.org/cmake.git CMake
+
+(cd CMake && git checkout v$CMAKE_VERSION)
+
+mkdir /usr/src/CMake-build
+cd /usr/src/CMake-build
+
+${WRAPPER} /usr/src/CMake/bootstrap \
+  --parallel=$(grep -c processor /proc/cpuinfo)
+${WRAPPER} make -j$(grep -c processor /proc/cpuinfo)
+
+mkdir /usr/src/CMake-ssl-build
+cd /usr/src/CMake-ssl-build
+${WRAPPER} /usr/src/CMake-build/bin/cmake \
+  -DCMAKE_BUILD_TYPE:STRING=Release \
+  -DBUILD_TESTING:BOOL=ON \
+  -DCMAKE_INSTALL_PREFIX:PATH=/usr/src/cmake-$CMAKE_VERSION \
+  -DCMAKE_USE_OPENSSL:BOOL=ON \
+  -DOPENSSL_ROOT_DIR:PATH=/usr/local/ssl \
+  ../CMake
+${WRAPPER} make -j$(grep -c processor /proc/cpuinfo) install
+
+cd /usr/src/cmake-$CMAKE_VERSION
+rm -rf doc man
+find . -type f -exec install -D "{}" "/usr/{}" \;
+
+# Test
+ctest -R CMake.FileDownload
+
+# Write test script
+cat <<EOF > cmake-test-https-download.cmake
+
+file(
+  DOWNLOAD https://raw.githubusercontent.com/Kitware/CMake/master/README.rst /tmp/README.rst
+  STATUS status
+  )
+list(GET status 0 error_code)
+list(GET status 1 error_msg)
+if(error_code)
+  message(FATAL_ERROR "error: Failed to download ${url} - ${error_msg}")
+else()
+  message(STATUS "CMake: HTTPS download works")
+endif()
+
+file(REMOVE /tmp/README.rst)
+
+EOF
+
+# Execute test script
+cmake -P cmake-test-https-download.cmake
+
+rm -rf /usr/src/CMake*