allow testing against any core branch (dbt-labs#771)

.github/scripts/update_dbt_core_branch.sh

@@ -0,0 +1,20 @@
+#!/bin/bash -e
+set -e
+
+git_branch=$1
+target_req_file="dev-requirements.txt"
+core_req_sed_pattern="s|dbt-core.git.*#egg=dbt-core|dbt-core.git@${git_branch}#egg=dbt-core|g"
+postgres_req_sed_pattern="s|dbt-core.git.*#egg=dbt-postgres|dbt-core.git@${git_branch}#egg=dbt-postgres|g"
+tests_req_sed_pattern="s|dbt-core.git.*#egg=dbt-tests|dbt-core.git@${git_branch}#egg=dbt-tests|g"
+if [[ "$OSTYPE" == darwin* ]]; then
+ # mac ships with a different version of sed that requires a delimiter arg
+ sed -i "" "$core_req_sed_pattern" $target_req_file
+ sed -i "" "$postgres_req_sed_pattern" $target_req_file
+ sed -i "" "$tests_req_sed_pattern" $target_req_file
+else
+ sed -i "$core_req_sed_pattern" $target_req_file
+ sed -i "$postgres_req_sed_pattern" $target_req_file
+ sed -i "$tests_req_sed_pattern" $target_req_file
+fi
+core_version=$(curl "https://raw.githubusercontent.com/dbt-labs/dbt-core/${git_branch}/core/dbt/version.py" | grep "__version__ = *"|cut -d'=' -f2)
+bumpversion --allow-dirty --new-version "$core_version" major

.github/workflows/integration.yml

@@ -33,6 +33,11 @@ on:
   pull_request_target:
   # manual trigger
   workflow_dispatch:
+    inputs:
+      dbt-core-branch:
+        description: "branch of dbt-core to use in dev-requirements.txt"
+        required: false
+        type: string
 
 # explicitly turn off permissions for `GITHUB_TOKEN`
 permissions: read-all
@@ -159,6 +164,12 @@ jobs:
           python -m pip --version
           tox --version
 
+      - name: Update dev_requirements.txt
+        if: inputs.dbt-core-branch != ''
+        run: |
+          pip install bumpversion
+          ./.github/scripts/update_dbt_core_branch.sh ${{ inputs.dbt-core-branch }}
+
       - name: Run tox (snowflake)
         if: matrix.adapter == 'snowflake'
         env: