Fix: Get the default branch from env vars also allow to overwrite as …

…parameter (#230)

README.md

@@ -69,6 +69,7 @@ _NOTE: set the fetch-depth for `actions/checkout@v2` or newer to be sure you ret
 
 - **GITHUB_TOKEN** **_(required)_** - Required for permission to tag the repo.
 - **DEFAULT_BUMP** _(optional)_ - Which type of bump to use when none explicitly provided (default: `minor`).
+- **DEFAULT_BRANCH** _(optional)_ - Overwrite the default branch its read from Github Runner env var but can be overwritten (default: `$GITHUB_BASE_REF`).
 - **WITH_V** _(optional)_ - Tag version with `v` character.
 - **RELEASE_BRANCHES** _(optional)_ - Comma separated list of branches (bash reg exp accepted) that will generate the release tags. Other branches and pull-requests generate versions postfixed with the commit hash and do not generate any tag. Examples: `master` or `.*` or `release.*,hotfix.*,master` ...
 - **CUSTOM_TAG** _(optional)_ - Set a custom tag, useful when generating tag based on f.ex FROM image in a docker image. **Setting this tag will invalidate any other settings set!**

entrypoint.sh

@@ -4,6 +4,7 @@ set -o pipefail
 
 # config
 default_semvar_bump=${DEFAULT_BUMP:-minor}
+default_branch=${DEFAULT_BRANCH:-$GITHUB_BASE_REF} # get the default branch from github runner env vars
 with_v=${WITH_V:-false}
 release_branches=${RELEASE_BRANCHES:-master,main}
 custom_tag=${CUSTOM_TAG:-}
@@ -26,6 +27,7 @@ cd "${GITHUB_WORKSPACE}/${source}" || exit 1
 
 echo "*** CONFIGURATION ***"
 echo -e "\tDEFAULT_BUMP: ${default_semvar_bump}"
+echo -e "\tDEFAULT_BRANCH: ${default_branch}"
 echo -e "\tWITH_V: ${with_v}"
 echo -e "\tRELEASE_BRANCHES: ${release_branches}"
 echo -e "\tCUSTOM_TAG: ${custom_tag}"
@@ -127,7 +129,7 @@ fi
 # get the merge commit message looking for #bumps
 declare -A history_type=( 
     ["last"]="$(git show -s --format=%B)" \
-    ["full"]="$(git log master..HEAD --format=%B)" \
+    ["full"]="$(git log "${default_branch}"..HEAD --format=%B)" \
 )
 log=${history_type[${branch_history}]}
 printf "History:\n---\n%s\n---\n" "$log"