use constants everywhere possible. consistent indentation

.sig/manifest.8E47A1EC35A1551D.asc

@@ -1,16 +1,16 @@
 -----BEGIN PGP SIGNATURE-----
 
-iQIzBAABCgAdFiEEZ1U/vaRrtxq9LgsLjkeh7DWhVR0FAl+0bicACgkQjkeh7DWh
-VR3DyxAAlwmJxFCA/l4luZPHRzTSVuyLSSPc7E2+p696a6SjK63mobsyr/MdyMNN
-U8933/5Se7HZvV4SfAwYbVABkZOxBU+N/2p06LJ2KgqTmbyoNRDM5FBu+aU2NNWw
-ddHIlFdObBQvJ5jorFGwkcWNCmNSxZ2LlZzn/qCrIymG+jyt71pRjFbJpiMJGj1p
-kNuGXwDtzg4XtGKGNfZJIoTMvYo4dFfw6pYJn/OS8cufhsh15ocgLiE3SHstiNqM
-+cRQ//pRNnT6Q/J3idGgBqXl9S8CXzgJkUosIPY5vUZUrKNdcmE4jIcMrk8zKP5Q
-b31odCE2Qvakh+psWi2Xrf2sIA2IYLZ35UKN4E//LXaLdaaycGrl70QP2Cy/LFYC
-qdne2qzvSU7WJ1PBFuJVrqXUZIlJrjJROJFg44qOdSb1YFw0q36lTZ4bC++8bRh6
-9Lc8kHhJesdYl9866PBwEHKZ4vv1Bb/l2ySlgsS2qDKDhyl+Y7NpXNFkPmHQIIc6
-mRxo7uHyRS+4EkI7GcwxP+nP5jg0AI/+7Mdclc9YcD433nuhjBgh3zjSAASHOENI
-dbsdlxvDF9AWa+RddliIJmARUAwwXQgc8PzmHt+lQntt8m+JiJK+2vaCKTb4ANOQ
-eBQX4vhfZgaKwj4jWxvVGHlAkR/TguBY/NqFJj9BNKsMmvM5eiw=
-=ORZ0
+iQIzBAABCgAdFiEEZ1U/vaRrtxq9LgsLjkeh7DWhVR0FAl+1YpAACgkQjkeh7DWh
+VR2wWRAAieouX51DLRxoIYjmRQSCYnyeJUe1yrT9J9XM/iVpK+5xX2yXOMO2vz0f
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+TgcgsvprhOnrZEdTTKvtA9JXTk/T9h8zH/O+VSLyog5FDhEcm8k=
+=Fxj8
 -----END PGP SIGNATURE-----

.sig/manifest.txt

@@ -1,3 +1,3 @@
 64263feac7b00952e9ec3b6c1fd11316faa58ff673c6bd085fac9f6f8d8389f6 .gitignore
 f19d267e4aa6bf82d5416891697a2a81a574efdddecf5c54e3a8a77c207013fa README.md
-9188d59457ca4f71a6cb94ca1c3bd7ba5ac5515b1c06793b35f0482dca727de3 sig
+bf3492ca7625d9ac199678cf2828253e5968a87c5c444ec92e2a90ed1cbbac49 sig

sig

@@ -1,10 +1,10 @@
 #! /usr/bin/env bash
 set -e
 
-MIN_BASH_VERSION=4
-MIN_GPG_VERSION=2.2
-MIN_OPENSSL_VERSION=1.1
-MIN_GETOPT_VERSION=2.33
+readonly MIN_BASH_VERSION=4
+readonly MIN_GPG_VERSION=2.2
+readonly MIN_OPENSSL_VERSION=1.1
+readonly MIN_GETOPT_VERSION=2.33
 
 ## Private Functions
 
@@ -16,8 +16,8 @@ die() {
 
 ### Bail and instruct user on missing package to install for their platform
 die_pkg() {
-	local package=${1?}
-	local version=${2?}
+	local -r package=${1?}
+	local -r version=${2?}
 	local install_cmd
 	case "$OSTYPE" in
 		linux*)
@@ -124,7 +124,7 @@ get_files(){
 
 ### Get primary UID for a given fingerprint
 get_uid(){
-	local fp="${1?}"
+	local -r fp="${1?}"
 	gpg --list-keys --with-colons "${fp}" 2>&1 \
 		| awk -F: '$1 == "uid" {print $10}' \
 		| head -n1
@@ -132,7 +132,7 @@ get_uid(){
 
 ### Get primary fingerprint for given search
 get_primary_fp(){
-	local search="${1?}"
+	local -r search="${1?}"
 	gpg --list-keys --with-colons "${search}" 2>&1 \
 		| awk -F: '$1 == "fpr" {print $10}' \
 		| head -n1
@@ -140,7 +140,7 @@ get_primary_fp(){
 
 ### Get fingerprint for a given pgp file
 get_file_fp(){
-	local filename="${1?}"
+	local -r filename="${1?}"
 	gpg --list-packets "${filename}" \
 		| grep keyid \
 		| sed 's/.*keyid //g'
@@ -154,12 +154,12 @@ group_get_config(){
 
 ### Add fingerprint to a given group
 group_add_fp(){
-	local fp=${1?}
-	local group_name=${2?}
+	local -r fp=${1?}
+	local -r group_name=${2?}
+	local -r config=$(group_get_config)
 	local group_names=()
 	local member_lists=()
 	local name member_list config i data
-    local -r config=$(group_get_config)
 
 	while IFS=' =' read -rd, name member_list; do
 		group_names+=("${name:1}")
@@ -183,7 +183,7 @@ group_add_fp(){
 
 ### Get fingerprints for a given group
 group_get_fps(){
-	local group_name=${1?}
+	local -r group_name=${1?}
 	gpg --with-colons --list-config group \
 		| grep -i "^cfg:group:${group_name}:" \
 		| cut -d ':' -f4
@@ -192,8 +192,8 @@ group_get_fps(){
 ### Check if fingerprint belongs to a given group
 ### Give user option to add it if they wish
 group_check_fp(){
-	local fp=${1?}
-	local group_name=${2?}
+	local -r fp=${1?}
+	local -r group_name=${2?}
 	local -r group_fps=$(group_get_fps "${group_name}")
 	local -r uid=$(get_uid "${fp}")
 
@@ -220,13 +220,10 @@ group_check_fp(){
 ### Optionally verify all signatures belong to keys in gpg alias group
 verify_detached() {
 	[ $# -eq 3 ] || die "Usage: verify_detached <threshold> <group> <file>"
-	local threshold="${1}"
-	local group="${2}"
-	local filename="${3}"
-	local sig_count=0
-	local seen_fps=""
-	local fp
-	local uid
+	local -r threshold="${1}"
+	local -r group="${2}"
+	local -r filename="${3}"
+	local fp uid sig_count=0 seen_fps=""
 
 	for sig_filename in "${filename%.*}".*.asc; do
 		gpg --verify "${sig_filename}" "${filename}" >/dev/null 2>&1 || {
@@ -259,11 +256,9 @@ verify_detached() {
 ### Optionally verify all signatures belong to keys in gpg alias group
 verify_git(){
 	[ $# -eq 2 ] || die "Usage: verify_git <threshold> <group>"
-	local threshold="${1}"
-	local group="${2}"
-	local seen_fps=""
-	local sig_count=0
-	local depth=0
+	local -r threshold="${1}"
+	local -r group="${2}"
+	local seen_fps="" sig_count=0 depth=0
 
 	while [[ $depth != "$(git rev-list --count HEAD)" ]]; do
 		ref=HEAD~${depth}
@@ -378,7 +373,7 @@ cmd_usage() {
 check_tools head cut find sort sed getopt gpg openssl
 
 # Allow entire script to be namespaced based on filename
-PROGRAM="${0##*/}"
+readonly PROGRAM="${0##*/}"
 
 # Export public sub-commands
 case "$1" in