Add init script for MacOS installs

zcutil/init-mac.sh

@@ -0,0 +1,139 @@
+#!/bin/bash
+
+set -eu
+
+if [[ "$OSTYPE" == "darwin"* ]]; then
+    PARAMS_DIR="$HOME/Library/Application Support/ZcashParams"
+else
+    PARAMS_DIR="$HOME/.zcash-params"
+fi
+
+SPROUT_PKEY_NAME='sprout-proving.key'
+SPROUT_VKEY_NAME='sprout-verifying.key'
+SPROUT_PKEY_URL="https://z.cash/downloads/$SPROUT_PKEY_NAME"
+SPROUT_VKEY_URL="https://z.cash/downloads/$SPROUT_VKEY_NAME"
+
+SHA256CMD="$(command -v sha256sum || echo shasum)"
+SHA256ARGS="$(command -v sha256sum >/dev/null || echo '-a 256')"
+
+function fetch_params {
+    local url="$1"
+    local output="$2"
+    local dlname="${output}.dl"
+    local expectedhash="$3"
+
+    if ! [ -f "$output" ]; then
+        echo "Retrieving: $url"
+        if [[ $(sw_vers -productName) == "Mac OS X" ]]; then
+            curl \
+                --output "$dlname" \
+                -# -L -C - \
+                "$url"
+        else
+            wget \
+                --progress=dot:giga \
+                --output-document="$dlname" \
+                --continue \
+                --retry-connrefused --waitretry=3 --timeout=30 \
+                "$url"
+        fi
+
+        "$SHA256CMD" $SHA256ARGS --check <<EOF
+$expectedhash  $dlname
+EOF
+
+        # Check the exit code of the shasum command:
+        CHECKSUM_RESULT=$?
+        if [ $CHECKSUM_RESULT -eq 0 ]; then
+            mv -v "$dlname" "$output"
+        else
+           echo "Failed to verify parameter checksums!"
+           exit 1
+        fi
+    fi
+}
+
+# Use flock to prevent parallel execution.
+function lock() {
+    local lockfile=/tmp/fetch_params.lock
+    if [[ "$OSTYPE" == "darwin"* ]]; then
+        if shlock -f ${lockfile} -p $$; then
+            return 0
+        else
+            return 1
+        fi
+    else
+        # create lock file
+        eval "exec 200>/$lockfile"
+        # acquire the lock
+        flock -n 200 \
+            && return 0 \
+            || return 1
+    fi
+}
+
+function exit_locked_error {
+    echo "Only one instance of fetch-params.sh can be run at a time." >&2
+    exit 1
+}
+
+function main() {
+
+    lock fetch-params.sh \
+    || exit_locked_error
+
+    cat <<EOF
+Zcash - fetch-params.sh
+
+This script will fetch the Zcash zkSNARK parameters and verify their
+integrity with sha256sum.
+
+If they already exist locally, it will exit now and do nothing else.
+EOF
+
+    # Now create PARAMS_DIR and insert a README if necessary:
+    if ! [ -d "$PARAMS_DIR" ]
+    then
+        mkdir -p "$PARAMS_DIR"
+        README_PATH="$PARAMS_DIR/README"
+        cat >> "$README_PATH" <<EOF
+This directory stores common Zcash zkSNARK parameters. Note that it is
+distinct from the daemon's -datadir argument because the parameters are
+large and may be shared across multiple distinct -datadir's such as when
+setting up test networks.
+EOF
+
+        # This may be the first time the user's run this script, so give
+        # them some info, especially about bandwidth usage:
+        cat <<EOF
+The parameters are currently just under 911MB in size, so plan accordingly
+for your bandwidth constraints. If the files are already present and
+have the correct sha256sum, no networking is used.
+
+Creating params directory. For details about this directory, see:
+$README_PATH
+
+EOF
+    fi
+
+    cd "$PARAMS_DIR"
+
+    fetch_params "$SPROUT_PKEY_URL" "$PARAMS_DIR/$SPROUT_PKEY_NAME" "8bc20a7f013b2b58970cddd2e7ea028975c88ae7ceb9259a5344a16bc2$
+    fetch_params "$SPROUT_VKEY_URL" "$PARAMS_DIR/$SPROUT_VKEY_NAME" "4bd498dae0aacfd8e98dc306338d017d9c08dd0918ead18172bd0aec2f$
+}
+
+main
+rm -f /tmp/fetch_params.lock
+
+if [ ! -f "$HOME/Library/Application Support/Zclassic/zclassic.conf" ]; then
+    echo "Creating zclassic.conf"
+    mkdir -p "$HOME/Library/Application Support/Zclassic/"
+    echo "rpcuser=zcashrpc" > ~/Library/Application\ Support/Zclassic/zclassic.conf
+    PASSWORD=$(cat /dev/urandom | env LC_CTYPE=C tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1)
+    echo "rpcpassword=$PASSWORD" >> "$HOME/Library/Application Support/Zclassic/zclassic.conf"
+    echo "Complete!"
+fi
+
+exit 0
+
+