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#!/bin/bash
set -eu +o pipefail
# Example output of `git status -sb`:
# ## master...origin/master [behind 1]
# M .github/workflows/verify_upstream.sh
UPSTREAM_BRANCH_NAME="$(git status -sb | head -n 1 | cut -d' ' -f2 | grep -E '\.{3}' | cut -d'.' -f4)"
printf '%s\n' "Upstream branch name: $UPSTREAM_BRANCH_NAME"
set -o pipefail
if [ -z "$UPSTREAM_BRANCH_NAME" ]; then
printf >&2 '%s\n' "::error::Unable to determine upstream branch name!"
exit 1
fi
git fetch "${UPSTREAM_BRANCH_NAME%%/*}"
if ! UPSTREAM_SHA="$(git rev-parse "$UPSTREAM_BRANCH_NAME")"; then
printf >&2 '%s\n' "::error::Unable to determine upstream branch sha!"
exit 1
fi
HEAD_SHA="$(git rev-parse HEAD)"
if [ "$HEAD_SHA" != "$UPSTREAM_SHA" ]; then
printf >&2 '%s\n' "[HEAD SHA] $HEAD_SHA != $UPSTREAM_SHA [UPSTREAM SHA]"
printf >&2 '%s\n' "::error::Upstream has changed, aborting release..."
exit 1
fi
printf '%s\n' "Verified upstream branch has not changed, continuing with release..."
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