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27 lines
836 B
Bash
27 lines
836 B
Bash
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#!/usr/bin/env bash
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set -x -e -u
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git fetch origin "$GITHUB_BASE_REF"
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BASE_ID=$(git rev-parse --verify "origin/$GITHUB_BASE_REF")
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CURRENT_ID=$(git rev-parse --verify "HEAD")
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# Oldest commit that's not in the base branch
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FIRST_BRANCH_ID=$(git rev-list "origin/$GITHUB_BASE_REF..HEAD" | tail -n 1)
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# Common ancestor (usually just parent of $FIRST_BRANCH_ID)
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# Command will return error 1 if not found anything. So we || true to proceed.
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FORK_POINT_ID=$(git merge-base "$FIRST_BRANCH_ID" "origin/$GITHUB_BASE_REF") || true
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if [[ -z "$FORK_POINT_ID" ]]
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then
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echo "Current branch is not forked from its base branch origin/$GITHUB_BASE_REF"
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exit 1
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fi
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if [[ "$BASE_ID" != "$FORK_POINT_ID" ]]
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then
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echo "Current branch (at $CURRENT_ID) forked at $FORK_POINT_ID is not $BASE_ID (which is the latest \"$GITHUB_BASE_REF\")"
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exit 1
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fi
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