Don't clobber local changes to libs when running setup

Summary:
When developing or having local fixes to various libraries, running
libs/setup.sh would delete all of those changes. This is now changed, so
that libs/cleanup.sh isn't run at the start. In addition to that, all of
the libraries cloned from git will stash local changes and reapply them
after checking out the desired commit. Conflicting changes should cause
an error and stop the script from continuing.

Reviewers: dgleich, mferencevic

Reviewed By: dgleich

Subscribers: pullbot

Differential Revision: https://phabricator.memgraph.io/D1009

libs/setup.sh

@@ -5,106 +5,115 @@
 working_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 cd ${working_dir}
 
-# Cleanup existing dependencies.
+# Clones a git repository and optionally cherry picks additional commits. The
-./cleanup.sh
+# function will try to preserve any local changes in the repo.
+# clone GIT_REPO DIR_NAME CHECKOUT_ID [CHERRY_PICK_ID]...
+clone () {
+  local git_repo=$1
+  local dir_name=$2
+  local checkout_id=$3
+  shift 3
+  # Clone if there's no repo.
+  if [[ ! -d "$dir_name" ]]; then
+    git clone "$git_repo" "$dir_name"
+  fi
+  pushd "$dir_name"
+  # Just fetch new commits from remote repository. Don't merge/pull them in, so
+  # that we don't clobber local modifications.
+  git fetch
+  # Check whether we have any local changes which need to be preserved.
+  local local_changes=true
+  if git diff --no-ext-diff --quiet && git diff --no-ext-diff --cached --quiet; then
+    local_changes=false
+  fi
+  # Stash regardless of local_changes, so that a user gets a message on stdout.
+  git stash
+  # Checkout the primary commit (there's no need to pull/merge).
+  git checkout $checkout_id
+  # Apply any optional cherry pick fixes.
+  while [[ $# -ne 0 ]]; do
+    local cherry_pick_id=$1
+    shift
+    git cherry-pick -n $cherry_pick_id
+  done
+  # Reapply any local changes.
+  if [[ $local_changes == true ]]; then
+    git stash pop
+  fi
+  popd
+}
 
 # antlr
 antlr_generator_filename="antlr-4.6-complete.jar"
 # wget -O ${antlr_generator_filename} http://www.antlr.org/download/${antlr_generator_filename}
 wget -nv -O ${antlr_generator_filename} http://deps.memgraph.io/${antlr_generator_filename}
 # git clone https://github.com/antlr/antlr4.git
-git clone git://deps.memgraph.io/antlr4.git
 antlr4_tag="aacd2a2c95816d8dc1c05814051d631bfec4cf3e" # v4.6
-cd antlr4
+clone git://deps.memgraph.io/antlr4.git antlr4 $antlr4_tag
-git checkout ${antlr4_tag}
-cd ..
 
 # cppitertools
 # Use our fork that uses experimental/optional instead of unique_ptr in
 # DerefHolder. Once we move memgraph to c++17 we can use cpp17 branch from
 # original repo.
 # git clone https://github.com/memgraph/cppitertools.git
-git clone git://deps.memgraph.io/cppitertools.git
-cd cppitertools
 cppitertools_tag="4231e0bc6fba2737b2a7a8a1576cf06186b0de6a" # experimental_optional 17 Aug 2017
-git checkout ${cppitertools_tag}
+clone git://deps.memgraph.io/cppitertools.git cppitertools $cppitertools_tag
-cd ..
 
 # fmt
 # git clone https://github.com/fmtlib/fmt.git
-git clone git://deps.memgraph.io/fmt.git
 fmt_tag="7fa8f8fa48b0903deab5bb42e6760477173ac485" # v3.0.1
 # Commit which fixes an issue when compiling with C++14 and higher.
 fmt_cxx14_fix="b9aaa507fc49680d037fd84c043f747a395bce04"
-cd fmt
+clone git://deps.memgraph.io/fmt.git fmt $fmt_tag $fmt_cxx14_fix
-git checkout ${fmt_tag}
-git cherry-pick -n ${fmt_cxx14_fix}
-cd ..
 
 # rapidcheck
 # git clone https://github.com/emil-e/rapidcheck.git
-git clone git://deps.memgraph.io/rapidcheck.git
 rapidcheck_tag="853e14f0f4313a9eb3c71e24848373e7b843dfd1" # Jun 23, 2017
-cd rapidcheck
+clone git://deps.memgraph.io/rapidcheck.git rapidcheck $rapidcheck_tag
-git checkout ${rapidcheck_tag}
-cd ..
 
 # google benchmark
 # git clone https://github.com/google/benchmark.git
-git clone git://deps.memgraph.io/benchmark.git
 benchmark_tag="4f8bfeae470950ef005327973f15b0044eceaceb" # v1.1.0
-cd benchmark
+clone git://deps.memgraph.io/benchmark.git benchmark $benchmark_tag
-git checkout ${benchmark_tag}
-cd ..
 
 # google test
 # git clone https://github.com/google/googletest.git
-git clone git://deps.memgraph.io/googletest.git
 googletest_tag="ec44c6c1675c25b9827aacd08c02433cccde7780" # v1.8.0
-cd googletest
+clone git://deps.memgraph.io/googletest.git googletest $googletest_tag
-git checkout ${googletest_tag}
-cd ..
 
 # google logging
 # git clone https://github.com/memgraph/glog.git
-git clone git://deps.memgraph.io/glog.git
 glog_tag="042a21657e79784226babab8b942f7bd0949635f" # custom version (v0.3.5+)
-cd glog
+clone git://deps.memgraph.io/glog.git glog $glog_tag
-git checkout ${glog_tag}
-cd ..
 
 # lcov-to-coberatura-xml
 # git clone https://github.com/eriwen/lcov-to-cobertura-xml.git
-git clone git://deps.memgraph.io/lcov-to-cobertura-xml.git
 lcov_to_xml_tag="59584761cb5da4687693faec05bf3e2b74e9dde9" # Dec 6, 2016
-cd lcov-to-cobertura-xml
+clone git://deps.memgraph.io/lcov-to-cobertura-xml.git lcov-to-cobertura-xml $lcov_to_xml_tag
-git checkout ${lcov_to_xml_tag}
-cd ..
 
 # google flags
 # git clone https://github.com/memgraph/gflags.git
-git clone git://deps.memgraph.io/gflags.git
 gflags_tag="b37ceb03a0e56c9f15ce80409438a555f8a67b7c" # custom version (May 6, 2017)
-cd gflags
+clone git://deps.memgraph.io/gflags.git gflags $gflags_tag
-git checkout ${gflags_tag}
-cd ..
 
 # neo4j
 wget -nv http://deps.memgraph.io/neo4j-community-3.2.3-unix.tar.gz -O neo4j.tar.gz
 tar -xzf neo4j.tar.gz
+rm -rf neo4j
 mv neo4j-community-3.2.3 neo4j
 rm neo4j.tar.gz
 
 # postgresql
 wget -nv http://deps.memgraph.io/postgresql-9.6.5-1-linux-x64-binaries.tar.gz -O postgres.tar.gz
 tar -xzf postgres.tar.gz
+rm -rf postgresql
 mv pgsql postgresql
 rm postgres.tar.gz
 
 # nlohmann json
 # We wget header instead of cloning repo since repo is huge (lots of test data).
 # We use head on Sep 1, 2017 instead of last release since it was long time ago.
-mkdir json
+mkdir -p json
 cd json
 # wget "https://raw.githubusercontent.com/nlohmann/json/91e003285312167ad8365f387438ea371b465a7e/src/json.hpp"
 wget -nv http://deps.memgraph.io/json.hpp
@@ -112,15 +121,9 @@ cd ..
 
 # ltalloc
 # git clone https://github.com/r-lyeh/ltalloc.git
-git clone git://deps.memgraph.io/ltalloc.git
 ltalloc_tag="43b51c14857111f993f277c46151fdfac91525a2" # Nov 16, 2017
-cd ltalloc
+clone git://deps.memgraph.io/ltalloc.git ltalloc $ltalloc_tag
-git checkout ${ltalloc_tag}
-cd ..
 
 # cereal
 #git clone https://github.com/USCiLab/cereal.git
-git clone git://deps.memgraph.io/cereal.git
+clone git://deps.memgraph.io/cereal.git cereal v1.2.2
-cd cereal
-git checkout v1.2.2
-cd ..