Do not check the release list if a Terraform is already installed (fixes

 #395)

Today, tfenv checks the Terraform release list when running
`tfenv install`, even if the requested Terraform is already
installed. This fixes an issue where a script containing
`tfenv install` becomes inoperable even if Terraform is installed,
but releases.hashicorp.com is down.

See #395 for more information.

libexec/tfenv-install

@@ -73,15 +73,15 @@ declare regex="${resolved##*\:}";
 
 log 'debug' "Processing install for version ${version}, using regex ${regex}";
 
-remote_version="$(tfenv-list-remote | grep -e "${regex}" | head -n 1)";
-[ -n "${remote_version}" ] && version="${remote_version}" || log 'error' "No versions matching '${requested:-$version}' found in remote";
-
 dst_path="${TFENV_CONFIG_DIR}/versions/${version}";
 if [ -f "${dst_path}/terraform" ]; then
   echo "Terraform v${version} is already installed";
   exit 0;
 fi;
 
+remote_version="$(tfenv-list-remote | grep -e "${regex}" | head -n 1)";
+[ -n "${remote_version}" ] && version="${remote_version}" || log 'error' "No versions matching '${requested:-$version}' found in remote";
+
 case "$(uname -s)" in
   Darwin*)
     kernel="darwin";