optimization in git clone using --depth

optimize the git clone using --depth flag in term of size of clone
and also in term's of time taken to fetch the files and commit history
of whole repository .

More detail can be found at blog
https://www.atlassian.com/git/tutorials/big-repositories

Signed-off-by: Pratik Raj <rajpratik71@gmail.com>

benchmarks/workloads/absl/Dockerfile

@@ -16,9 +16,10 @@ RUN wget https://github.com/bazelbuild/bazel/releases/download/0.27.0/bazel-0.27
 RUN chmod +x bazel-0.27.0-installer-linux-x86_64.sh
 RUN ./bazel-0.27.0-installer-linux-x86_64.sh
 
-RUN git clone https://github.com/abseil/abseil-cpp.git
+RUN mkdir abseil-cpp && cd abseil-cpp \
+    && git init && git remote add origin https://github.com/abseil/abseil-cpp.git \
+    && git fetch --depth 1 origin 43ef2148c0936ebf7cb4be6b19927a9d9d145b8f && git checkout FETCH_HEAD
 WORKDIR abseil-cpp
-RUN git checkout 43ef2148c0936ebf7cb4be6b19927a9d9d145b8f
 RUN bazel clean
 ENV path "absl/base/..."
 CMD bazel build ${path} 2>&1

benchmarks/workloads/tensorflow/Dockerfile

@@ -2,7 +2,7 @@ FROM tensorflow/tensorflow:1.13.2
 
 RUN apt-get update \
     && apt-get install -y git
-RUN git clone https://github.com/aymericdamien/TensorFlow-Examples.git
+RUN git clone --depth 1 https://github.com/aymericdamien/TensorFlow-Examples.git
 RUN python -m pip install -U pip setuptools
 RUN python -m pip install matplotlib
 

images/packetdrill/Dockerfile

@@ -2,7 +2,7 @@ FROM ubuntu:bionic
 RUN apt-get update && apt-get install -y net-tools git iptables iputils-ping \
         netcat tcpdump jq tar bison flex make
 RUN hash -r
-RUN git clone --branch packetdrill-v2.0 \
+RUN git clone --depth 1 --branch packetdrill-v2.0 \
         https://github.com/google/packetdrill.git
 RUN cd packetdrill/gtests/net/packetdrill && ./configure && make
 CMD /bin/bash