Let the template spit out the backslashes

templates/tools/dockerfile/python_build_interop.sh.include

@@ -19,8 +19,8 @@ set -e
 mkdir -p /var/local/git
 git clone /var/local/jenkins/grpc /var/local/git/grpc
 # clone gRPC submodules, use data from locally cloned submodules where possible
-(cd /var/local/jenkins/grpc/ && git submodule foreach 'cd /var/local/git/grpc \
-&& git submodule update --init --reference /var/local/jenkins/grpc/${"${name}"} \
+(cd /var/local/jenkins/grpc/ && git submodule foreach 'cd /var/local/git/grpc ${"\\"}
+&& git submodule update --init --reference /var/local/jenkins/grpc/${"${name}"} ${"\\"}
 ${"${name}"}')
 
 # copy service account keys if available

tools/dockerfile/interoptest/grpc_interop_python/build_interop.sh

@@ -19,7 +19,9 @@ set -e
 mkdir -p /var/local/git
 git clone /var/local/jenkins/grpc /var/local/git/grpc
 # clone gRPC submodules, use data from locally cloned submodules where possible
-(cd /var/local/jenkins/grpc/ && git submodule foreach 'cd /var/local/git/grpc && git submodule update --init --reference /var/local/jenkins/grpc/${name} ${name}')
+(cd /var/local/jenkins/grpc/ && git submodule foreach 'cd /var/local/git/grpc \
+&& git submodule update --init --reference /var/local/jenkins/grpc/${name} \
+${name}')
 
 # copy service account keys if available
 cp -r /var/local/jenkins/service_account $HOME || true

tools/dockerfile/interoptest/grpc_interop_pythonasyncio/build_interop.sh

@@ -19,7 +19,9 @@ set -e
 mkdir -p /var/local/git
 git clone /var/local/jenkins/grpc /var/local/git/grpc
 # clone gRPC submodules, use data from locally cloned submodules where possible
-(cd /var/local/jenkins/grpc/ && git submodule foreach 'cd /var/local/git/grpc && git submodule update --init --reference /var/local/jenkins/grpc/${name} ${name}')
+(cd /var/local/jenkins/grpc/ && git submodule foreach 'cd /var/local/git/grpc \
+&& git submodule update --init --reference /var/local/jenkins/grpc/${name} \
+${name}')
 
 # copy service account keys if available
 cp -r /var/local/jenkins/service_account $HOME || true