Add error checking to libsodium build

res/libsodium/buildlibsodium.sh

@@ -1,33 +1,45 @@
 #!/bin/bash
 # Copyright 2019-2021 The Hush developers
 # Released under the GPLv3
+VERSION=1.0.18
 
 # First thing to do is see if libsodium.a exists in the res folder. If it does, then there's nothing to do
 if [ -f res/libsodium.a ]; then
-    echo "libsodium is already built! Nothing to do"
+    echo "libsodium $VERSION is already built! Nothing to do"
     exit 0
 fi
 
-echo "Building libsodium"
+echo "Building libsodium $VERSION"
 
 # Go into the lib sodium directory
 cd res/libsodium
 if [ ! -f libsodium-1.0.18.tar.gz ]; then
-    echo "Downloading libsodium"
+    echo "Downloading libsodium $VERSION"
     curl -LO https://github.com/MyHush/libsodium/releases/download/1.0.18/libsodium-1.0.18.tar.gz
 fi
 
-# TODO: check libsodium downloaded correctly
+if [ ! -f libsodium-1.0.18.tar.gz ]; then
+    echo "Unable to download libsodium $VERSION !!! Aborting"
+    exit 1
+fi
 
 if [ ! -d libsodium-1.0.18 ]; then
-    echo "Unpacking libsodium"
+    echo "Unpacking libsodium $VERSION"
     tar xf libsodium-1.0.18.tar.gz
 fi
 
+if [ ! -d libsodium-1.0.18 ]; then
+    echo "Unable to unpack libsodium $VERSION !!! Aborting"
+    exit 1
+fi
+
 # Now build it
 cd libsodium-1.0.18
+echo "Configuring libsodium $VERSION"
 LIBS="" ./configure
 make clean
+
+echo "Compiling libsodium $VERSION"
 if [[ "$OSTYPE" == "darwin"* ]]; then
     make CFLAGS="-mmacosx-version-min=10.11" CPPFLAGS="-mmacosx-version-min=10.11" -j4
 else
@@ -35,5 +47,10 @@ else
 fi
 cd ..
 
+if [ ! -e libsodium-1.0.18/src/libsodium/.libs/libsodium.a ]; then
+    echo "Unable to compile libsodium $VERSION !!! Aborting"
+    exit 1
+fi
+
 # copy the library to the parents's res/ folder
 cp libsodium-1.0.18/src/libsodium/.libs/libsodium.a ../