ubuntu 18 prewarm cache build fix

ubuntu 18 prewarm cache build fix

Pull Request resolved: #328

.github/prewarm/build.sh

@@ -6,6 +6,9 @@ export CCACHE_BASEDIR=/ydbwork/
 
 export CONAN_USER_HOME=/ydbwork/build
 
+export CC=/usr/bin/clang-14
+export CC_FOR_BUILD=$CC
+
 mkdir /ydbwork/build
 cd /ydbwork/build
 

.github/prewarm/ubuntu-1804.dockerfile

@@ -15,7 +15,12 @@ RUN apt-get update \
     && apt-get update
 
 
-RUN apt-get install -y git cmake python3-pip ninja-build antlr3 m4 clang-14 lld-14 libidn11-dev libaio1 libaio-dev llvm-14 make \
-    && pip3 install conan==1.59 grpcio-tools\
+RUN apt-get install -y --no-install-recommends python3.8 python3.8-venv python3-venv \
+    && python3.8 -m venv /opt/ve && /opt/ve/bin/pip install -U pip
+
+ENV PATH=/opt/ve/bin:$PATH
+
+RUN apt-get install -y --no-install-recommends git cmake ninja-build antlr3 m4 clang-14 lld-14 libidn11-dev libaio1 libaio-dev llvm-14 make \
+    && pip install conan==1.59 grpcio-tools==1.57.0 \
     && (V=4.8.1; curl -L https://github.com/ccache/ccache/releases/download/v${V}/ccache-${V}-linux-x86_64.tar.xz | \
      tar -xJ -C /usr/local/bin/ --strip-components=1 --no-same-owner ccache-${V}-linux-x86_64/ccache)

BUILD.md

@@ -26,29 +26,38 @@
 
 # How to Build
 
-## (optional) Add CMake and LLVM APT repositories (for Ubuntu 18.04 and 20.04)
-
-## Ubuntu 18.04 and Ubuntu 20.04
-
-For Ubuntu 18.04 and Ubuntu 20.04, you have to add CMake and LLVM APT repositories:
-
-```bash
-wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc | sudo apt-key add -
-echo "deb http://apt.kitware.com/ubuntu/ $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/kitware.list >/dev/null
-
-wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-echo "deb http://apt.llvm.org/$(lsb_release -cs)/ llvm-toolchain-$(lsb_release -cs)-14 main" | sudo tee /etc/apt/sources.list.d/llvm.list >/dev/null
-
-sudo apt-get update
-
-```
+<details>
+   <summary>For Ubuntu 18.04, install Python 3.8, create and activate a new virtual environment, and install the latest PIP.</summary>
+
+   ```bash
+   apt-get install python3.8 python3.8-venv python3-venv
+   python3.8 -mvnev ~/ydbwork/ve
+   source ~/ydbwork/ve/bin/activate
+   pip install -U pip
+   ```
+</details>
+
+<details>
+   <summary>For Ubuntu 18.04 and Ubuntu 20.04, add CMake and LLVM APT repositories.</summary>
+
+   ```bash
+   wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc | sudo apt-key add -
+   echo "deb http://apt.kitware.com/ubuntu/ $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/kitware.list >/dev/null
+   
+   wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+   echo "deb http://apt.llvm.org/$(lsb_release -cs)/ llvm-toolchain-$(lsb_release -cs)-14 main" | sudo tee /etc/apt/sources.list.d/llvm.list >/dev/null
+   
+   sudo apt-get update
+   
+   ```
 
+</details>
 
 ## Install dependencies
 
 ```bash
 sudo apt-get -y install git cmake python3-pip ninja-build antlr3 m4 clang-14 lld-14 libidn11-dev libaio1 libaio-dev llvm-14
-sudo pip3 install conan==1.59
+sudo pip3 install conan==1.59 grpcio-tools==1.57.0
 
 ```