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#!/bin/sh
# A sample pre-build hook
#
# Checks:
# 1. We have a clean checkout
# 2. A remote is configured
# 3. The branch has been pushed to the remote
# 4. The version we are deploying matches the remote
#
# These environment variables are available:
# KAMAL_RECORDED_AT
# KAMAL_PERFORMER
# KAMAL_VERSION
# KAMAL_HOSTS
# KAMAL_ROLE (if set)
# KAMAL_DESTINATION (if set)
if [ -n "$(git status --porcelain)" ]; then
echo "Git checkout is not clean, aborting..." >&2
git status --porcelain >&2
exit 1
fi
first_remote=$(git remote)
if [ -z "$first_remote" ]; then
echo "No git remote set, aborting..." >&2
exit 1
fi
current_branch=$(git branch --show-current)
if [ -z "$current_branch" ]; then
echo "Not on a git branch, aborting..." >&2
exit 1
fi
remote_head=$(git ls-remote $first_remote --tags $current_branch | cut -f1)
if [ -z "$remote_head" ]; then
echo "Branch not pushed to remote, aborting..." >&2
exit 1
fi
if [ "$KAMAL_VERSION" != "$remote_head" ]; then
echo "Version ($KAMAL_VERSION) does not match remote HEAD ($remote_head), aborting..." >&2
exit 1
fi
exit 0
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