removed bashisms from build scripts

Co-authored-by: Jack Grigg <jack@electriccoin.co>

test/lint/lint-shell.sh

@@ -30,6 +30,7 @@ disabled=(
     SC2006 # Use $(..) instead of legacy `..`.
     SC2016 # Expressions don't expand in single quotes, use double quotes for that.
     SC2028 # echo won't expand escape sequences. Consider printf.
+    SC2039 # In POSIX sh, 'local' is undefined.
     SC2046 # Quote this to prevent word splitting.
     SC2048 # Use "$@" (with quotes) to prevent whitespace problems.
     SC2066 # Since you double quoted this, it will not word split, and the loop will only run once.

zcutil/build.sh

@@ -1,11 +1,11 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 export LC_ALL=C
-set -eu -o pipefail
+set -eu
 set +x
 
-function cmd_pref() {
-    if type -p "$2" > /dev/null; then
+cmd_pref() {
+    if command -v "$2" >/dev/null; then
         eval "$1=$2"
     else
         eval "$1=$3"
@@ -13,7 +13,7 @@ function cmd_pref() {
 }
 
 # If a g-prefixed version of the command exists, use it preferentially.
-function gprefix() {
+gprefix() {
     cmd_pref "$1" "g$2" "$2"
 }
 
@@ -22,21 +22,21 @@ cd "$(dirname "$("$READLINK" -f "$0")")/.."
 
 # Allow user overrides to $MAKE. Typical usage for users who need it:
 #   MAKE=gmake ./zcutil/build.sh -j$(nproc)
-if [[ -z "${MAKE-}" ]]; then
+if [ -z "${MAKE-}" ]; then
     MAKE=make
 fi
 
 # Allow overrides to $BUILD and $HOST for porters. Most users will not need it.
 #   BUILD=i686-pc-linux-gnu ./zcutil/build.sh
-if [[ -z "${BUILD-}" ]]; then
+if [ -z "${BUILD-}" ]; then
     BUILD="$(./depends/config.guess)"
 fi
-if [[ -z "${HOST-}" ]]; then
+if [ -z "${HOST-}" ]; then
     HOST="$BUILD"
 fi
 
 # Allow users to set arbitrary compile flags. Most users will not need this.
-if [[ -z "${CONFIGURE_FLAGS-}" ]]; then
+if [ -z "${CONFIGURE_FLAGS-}" ]; then
     CONFIGURE_FLAGS=""
 fi
 
@@ -69,13 +69,13 @@ set -x
 eval "$MAKE" --version
 as --version
 
-ENABLE_DEBUG_REGEX='^(.*\s)?--enable-debug(\s.*)?$'
-if [[ "$CONFIGURE_FLAGS" =~ $ENABLE_DEBUG_REGEX ]]
-then
+case "$CONFIGURE_FLAGS" in
+(*"--enable-debug"*)
     DEBUG=1
-else
+;;
+(*)
     DEBUG=
-fi
+;;esac
 
 HOST="$HOST" BUILD="$BUILD" "$MAKE" "$@" -C ./depends/ DEBUG="$DEBUG"
 

zcutil/fetch-params.sh

@@ -1,9 +1,11 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 export LC_ALL=C
 set -eu
 
-if [[ "$OSTYPE" == "darwin"* ]]; then
+uname_S=$(uname -s 2>/dev/null || echo not)
+
+if [ "$uname_S" = "Darwin" ]; then
     PARAMS_DIR="$HOME/Library/Application Support/ZcashParams"
 else
     PARAMS_DIR="$HOME/.zcash-params"
@@ -30,7 +32,7 @@ ZC_DISABLE_WGET="${ZC_DISABLE_WGET:-}"
 ZC_DISABLE_IPFS="${ZC_DISABLE_IPFS:-}"
 ZC_DISABLE_CURL="${ZC_DISABLE_CURL:-}"
 
-function fetch_wget {
+fetch_wget() {
     if [ -z "$WGETCMD" ] || ! [ -z "$ZC_DISABLE_WGET" ]; then
         return 1
     fi
@@ -51,7 +53,7 @@ EOF
         "$DOWNLOAD_URL/$filename"
 }
 
-function fetch_ipfs {
+fetch_ipfs() {
     if [ -z "$IPFSCMD" ] || ! [ -z "$ZC_DISABLE_IPFS" ]; then
         return 1
     fi
@@ -67,7 +69,7 @@ EOF
     ipfs get --output "$dlname" "$IPFS_HASH/$filename"
 }
 
-function fetch_curl {
+fetch_curl() {
     if [ -z "$CURLCMD" ] || ! [ -z "$ZC_DISABLE_CURL" ]; then
         return 1
     fi
@@ -87,7 +89,7 @@ EOF
 
 }
 
-function fetch_failure {
+fetch_failure() {
     cat >&2 <<EOF
 
 Failed to fetch the Zcash zkSNARK parameters!
@@ -101,7 +103,7 @@ EOF
     exit 1
 }
 
-function fetch_params {
+fetch_params() {
     local filename="$1"
     local output="$2"
     local dlname="${output}.dl"
@@ -146,9 +148,9 @@ EOF
 }
 
 # Use flock to prevent parallel execution.
-function lock() {
+lock() {
     local lockfile=/tmp/fetch_params.lock
-    if [[ "$OSTYPE" == "darwin"* ]]; then
+    if [ "$uname_S" = "Darwin" ]; then
         if shlock -f ${lockfile} -p $$; then
             return 0
         else
@@ -156,20 +158,20 @@ function lock() {
         fi
     else
         # create lock file
-        eval "exec 200>$lockfile"
+        eval "exec 9>$lockfile"
         # acquire the lock
-        flock -n 200 \
+        flock -n 9 \
             && return 0 \
             || return 1
     fi
 }
 
-function exit_locked_error {
+exit_locked_error() {
     echo "Only one instance of fetch-params.sh can be run at a time." >&2
     exit 1
 }
 
-function main() {
+main() {
 
     lock fetch-params.sh \
     || exit_locked_error