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#!/bin/bash
set +o posix
# Fail fast with concise message when cwd does not exist
if ! [[ -d "$PWD" ]]; then
echo "Error: The current working directory doesn't exist, cannot proceed." >&2
exit 1
fi
quiet_cd() {
cd "$@" >/dev/null || return
}
symlink_target_directory() {
local target target_dirname
target="$(readlink "$1")"
target_dirname="$(dirname "$target")"
local directory="$2"
quiet_cd "$directory" && quiet_cd "$target_dirname" && pwd -P
}
BREW_FILE_DIRECTORY="$(quiet_cd "${0%/*}/" && pwd -P)"
HOMEBREW_BREW_FILE="${BREW_FILE_DIRECTORY%/}/${0##*/}"
HOMEBREW_PREFIX="${HOMEBREW_BREW_FILE%/*/*}"
# Default to / prefix if unset or the bin/brew file.
if [[ -z "$HOMEBREW_PREFIX" || "$HOMEBREW_PREFIX" = "$HOMEBREW_BREW_FILE" ]]
then
HOMEBREW_PREFIX="/"
fi
HOMEBREW_REPOSITORY="$HOMEBREW_PREFIX"
# Resolve the bin/brew symlink to find Homebrew's repository
if [[ -L "$HOMEBREW_BREW_FILE" ]]
then
BREW_FILE_DIRECTORY="$(symlink_target_directory "$HOMEBREW_BREW_FILE" "$BREW_FILE_DIRECTORY")"
HOMEBREW_REPOSITORY="${BREW_FILE_DIRECTORY%/*}"
fi
# Try to find a /usr/local HOMEBREW_PREFIX where possible (for bottles)
if [[ -L "/usr/local/bin/brew" && ! -L "$HOMEBREW_PREFIX/Cellar" ]]
then
USR_LOCAL_BREW_FILE_DIRECTORY="$(symlink_target_directory "/usr/local/bin/brew" "/usr/local/bin")"
USR_LOCAL_HOMEBREW_REPOSITORY="${USR_LOCAL_BREW_FILE_DIRECTORY%/*}"
if [[ "$HOMEBREW_REPOSITORY" = "$USR_LOCAL_HOMEBREW_REPOSITORY" ]]
then
HOMEBREW_PREFIX="/usr/local"
fi
fi
HOMEBREW_LIBRARY="$HOMEBREW_REPOSITORY/Library"
# Whitelist and copy to HOMEBREW_* all variables previously mentioned in
# manpage or used elsewhere by Homebrew.
for VAR in AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY BINTRAY_USER BINTRAY_KEY \
BROWSER DISPLAY EDITOR GIT NO_COLOR PATH VISUAL
do
# Skip if variable value is empty.
[[ -z "${!VAR}" ]] && continue
VAR_NEW="HOMEBREW_${VAR}"
# Skip if existing HOMEBREW_* variable is set.
[[ -n "${!VAR_NEW}" ]] && continue
export "$VAR_NEW"="${!VAR}"
done
# Set CI variable for Azure Pipelines, Jenkins.
if [[ -n "$TF_BUILD" || -n "$JENKINS_HOME" ]]
then
export CI="1"
fi
# test-bot does environment filtering itself
if [[ -z "$HOMEBREW_NO_ENV_FILTERING" && "$1" != "test-bot" ]]
then
PATH="/usr/bin:/bin:/usr/sbin:/sbin"
FILTERED_ENV=()
# Filter all but the specific variables.
for VAR in HOME SHELL PATH TERM TERMINFO COLUMNS LOGNAME USER CI SSH_AUTH_SOCK SUDO_ASKPASS \
http_proxy https_proxy ftp_proxy no_proxy all_proxy HTTPS_PROXY FTP_PROXY ALL_PROXY \
"${!HOMEBREW_@}" "${!TRAVIS_@}"
do
# Skip if variable value is empty.
[[ -z "${!VAR}" ]] && continue
FILTERED_ENV+=( "${VAR}=${!VAR}" )
done
exec /usr/bin/env -i "${FILTERED_ENV[@]}" /bin/bash "$HOMEBREW_LIBRARY/Homebrew/brew.sh" "$@"
else
# Don't need shellcheck to follow this `source`.
# shellcheck disable=SC1090
source "$HOMEBREW_LIBRARY/Homebrew/brew.sh"
fi
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