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Generate deployment scripts for an application.

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mix_deploy priv templates rollback.eex
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priv/templates/rollback.eex 

#!/usr/bin/env bash



# Rollback release to previous

# Local deploy



set -e



# Environment vars

# DESTDIR, prefix for target files, optional



# Config vars

DEPLOY_DIR="${DEPLOY_DIR:-"<%= deploy_dir %>"}"



RELEASES_DIR="${DESTDIR}${RELEASES_DIR:-<%= releases_dir %>}"

CURRENT_LINK="${DESTDIR}${CURRENT_DIR:-<%= current_dir %>}"

# TODO: error handling

PREV_DIR=$(find -H "${RELEASES_DIR}" -maxdepth 1 | sort | tail -2 | head -1)

PREV_NAME=$(basename "${PREV_DIR}")

RELEASE="${RELEASE:-$PREV_NAME}"



echo "==> Rolling back to release $RELEASE"

if [[ -L "$CURRENT_LINK" ]]; then

    rm "$CURRENT_LINK"

fi

ln -s "${RELEASES_DIR}/${PREV_NAME}" "$CURRENT_LINK"