[macOS] Update deploy script to use ssh/scp

CI/deploy.osx.sh

@@ -1,11 +1,26 @@
 #!/bin/sh
 
-cd build
+# This script expect the following environment variables to be set:
+# - OSX_DEPLOY_KEY: private SSH key, must be encoded like this before adding it to Travis secrets: https://github.com/travis-ci/travis-ci/issues/7715#issuecomment-433301692
+# - OSX_DEPLOY_HOST: string specifying SSH of the following format: ssh-user@ssh-host
+# - OSX_DEPLOY_PORT: SSH port, it can't be a part of the host string because scp doesn't accept hosts with ports
+# - OSX_DEPLOY_HOST_FINGERPRINT: fingerprint of the host, can be obtained by using ssh-keygen -F [host]:port & putting it in double quotes when adding to Travis secrets
 
-DATE=`date +'%d%m%Y'`
-SHORT_COMMIT=`git rev-parse --short ${TRAVIS_COMMIT}`
+SSH_KEY_PATH="$HOME/.ssh/openmw_deploy"
+REMOTE_PATH="\$HOME/nightly"
+
+echo "$OSX_DEPLOY_KEY" > "$SSH_KEY_PATH"
+chmod 600 "$SSH_KEY_PATH"
+echo "$OSX_DEPLOY_HOST_FINGERPRINT" >> "$HOME/.ssh/known_hosts"
+
+cd build || exit 1
+
+DATE=$(date +'%d%m%Y')
+SHORT_COMMIT=$(git rev-parse --short "${TRAVIS_COMMIT}")
 TARGET_FILENAME="OpenMW-${DATE}-${SHORT_COMMIT}.dmg"
 
-if ! curl --ssl -u $OSX_FTP_USER:$OSX_FTP_PASSWORD "${OSX_FTP_URL}" --silent | grep $SHORT_COMMIT > /dev/null; then
-    curl --ssl --ftp-create-dirs -T *.dmg -u $OSX_FTP_USER:$OSX_FTP_PASSWORD "${OSX_FTP_URL}${TARGET_FILENAME}"
+if ! ssh -p "$OSX_DEPLOY_PORT" -i "$SSH_KEY_PATH" "$OSX_DEPLOY_HOST" sh -c "ls \"$REMOTE_PATH\"" | grep "$SHORT_COMMIT" > /dev/null; then
+    scp -P "$OSX_DEPLOY_PORT" -i "$SSH_KEY_PATH" ./*.dmg "$OSX_DEPLOY_HOST:$REMOTE_PATH/$TARGET_FILENAME"
+else
+    echo "An existing nightly build for commit ${SHORT_COMMIT} has been found, skipping upload."
 fi