98 lines
1.5 KiB
Bash
98 lines
1.5 KiB
Bash
set +o posix
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quiet_safe_cd() {
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cd "$1" &>/dev/null || {
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echo "Error: failed to cd to $1" >&2
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exit 1
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}
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}
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absdir() {
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quiet_safe_cd "${1%/*}/" && pwd -P
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}
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dirbasepath() {
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local dir="$1"
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local base="${2##*/}"
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echo "${dir}/${base}"
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}
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realpath() {
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local path="$1"
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local dir
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local dest
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dir="$(absdir "${path}")"
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path="$(dirbasepath "${dir}" "${path}")"
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while [[ -L "${path}" ]]
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do
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dest="$(readlink "${path}")"
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if [[ "${dest}" == "/"* ]]
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then
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path="${dest}"
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else
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path="${dir}/${dest}"
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fi
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dir="$(absdir "${path}")"
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path="$(dirbasepath "${dir}" "${path}")"
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done
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echo "${path}"
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}
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executable() {
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local file="$1"
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[[ -f "${file}" && -x "${file}" ]]
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}
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lowercase() {
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echo "$1" | tr "[:upper:]" "[:lower:]"
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}
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safe_exec() {
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local arg0="$1"
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if ! executable "${arg0}"
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then
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return
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fi
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# prevent fork-bombs
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if [[ "$(lowercase "${arg0}")" == "${SHIM_FILE}" || "$(realpath "${arg0}")" == "${SHIM_REAL}" ]]
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then
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return
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fi
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if [[ "${HOMEBREW}" == "print-path" ]]
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then
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local dir
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dir="$(quiet_safe_cd "${arg0%/*}/" && pwd)"
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local path
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path="$(dirbasepath "${dir}" "${arg0}")"
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echo "${path}"
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exit
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fi
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exec "$@"
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}
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try_exec_non_system() {
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local file="$1"
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shift
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local path
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while read -r path
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do
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if [[ "${path}" != "/usr/bin/${file}" ]]
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then
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safe_exec "${path}" "$@"
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fi
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done < <(type -aP "${file}")
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}
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SHIM_FILE="${0##*/}"
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SHIM_REAL="$(realpath "$0")"
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if [[ "$1" == "--homebrew="* ]]
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then
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HOMEBREW="${1:11}"
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shift
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fi
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