From 7d6125beb3b0b624eafb8979b23d6f35fd23bcf9 Mon Sep 17 00:00:00 2001
From: Vince Buffalo <vsbuffalo@gmail.com>
Date: Thu, 7 Sep 2023 13:39:34 -0700
Subject: [PATCH] more features of easy install

---
 easy_install.sh | 36 ++++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/easy_install.sh b/easy_install.sh
index 96ccbc2..1614f11 100644
--- a/easy_install.sh
+++ b/easy_install.sh
@@ -1,9 +1,37 @@
 #!/bin/sh
 
-# first install rust
-echo "Installing Rust first..."
-curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
 
-# next install SciDataFlow
+if ! command -v rustc &> /dev/null; then
+
+   # expected MD5 of Rust
+   expected_md5="9457a47bb675d495b53d2ebbb757f63d"
+   
+   # temp installer file
+   temp_file=$(mktemp)
+   
+   # download Rust installer
+   curl --proto '=https' --tlsv1.2 -sSf -o "$temp_file" https://sh.rustup.rs
+   
+   # calculate the MD5 hash of the downloaded file
+   calculated_md5=$(md5sum "$temp_file" | awk '{ print $1 }')
+   
+   # verify MD5 hash
+   if [ "$expected_md5" != "$calculated_md5" ]; then
+       echo "MD5 verification of Rust installer failed! This is likely a version change.\nPlease report, and install manually from:\nhttps://www.rust-lang.org/learn/get-started"
+       rm "$temp_file"
+       exit 1
+   else
+       echo "MD5 verified. Installing Rust..."
+       sh "$temp_file"
+   fi
+   
+   # remove the temporary file
+   rm "$temp_file"
+else
+    echo "Rust is already installed."
+fi
+   
+# install SciDataFlow
 echo "Now installing SciDataFlow..."
 cargo install scidataflow
+