fix(codechecker): Do not install "alpha" or "rc" versions when auto-selecting

src/build-codechecker.sh

@@ -1,6 +1,5 @@
 #!/bin/bash
-set -e
-
+set -eo pipefail
 if [[ ! -z "$CODECHECKER_ACTION_DEBUG" ]]; then
   set -x
 fi

src/get-llvm.sh

@@ -3,6 +3,7 @@ set -e
 if [[ ! -z "$CODECHECKER_ACTION_DEBUG" ]]; then
   set -x
 fi
+set -u
 
 echo "::group::Installing LLVM"
 

src/pip-codechecker.sh

@@ -1,16 +1,36 @@
 #!/bin/bash
+set -o pipefail
 if [[ ! -z "$CODECHECKER_ACTION_DEBUG" ]]; then
   set -x
 fi
 
-echo "::group::Installing CodeChecker from PyPI"
+echo "::group::Installing CodeChecker $IN_VERSION from PyPI"
 if [[ "$IN_VERSION" == "master" ]]; then
   # The default branch name "master" is offered as a convenient shortcut for
-  # fetching the latest release.
-  pip3 install codechecker
-else
-  pip3 install codechecker=="$IN_VERSION"
+  # fetching the latest release. Unfortunately, this might just be a release
+  # candidate, which we do not wish to supply to automated production users
+  # this eagerly...
+
+  # Hack to get pip list us which versions are available...
+  # (thanks, http://stackoverflow.com/a/26664162)
+  pip3 install codechecker=="You_cant_be_serious_mate" 2>&1  \
+    | grep "ERROR: Could not find a version"                 \
+    | sed 's/^.*(from versions: \(.*\))/\1/'                 \
+    | sed 's/, /\n/g'                                        \
+    | grep -v 'rc\|a'                                        \
+    | sort -V                                                \
+    | tail -n 1                                              \
+    >> "codechecker_latest_release.txt"
+
+  IN_VERSION=$(cat "codechecker_latest_release.txt")
+  echo "Selected CodeChecker version $IN_VERSION automatically."
+  rm "codechecker_latest_release.txt"
 fi
+
+set -e
+
+pip3 install codechecker=="$IN_VERSION"
+
 pip3 show codechecker
 echo "::endgroup::"