CXX-2990 Fix Debian Package Build on Evergreen (#1119)

.evergreen/debian_package_build.sh

@@ -21,10 +21,15 @@ if [ ! -z "${DEB_BUILD_PROFILES}" ]; then
 fi
 
 if [ "${IS_PATCH}" = "true" ]; then
-  git diff HEAD -- . ':!debian' > ../upstream.patch
-  git diff HEAD -- debian > ../debian.patch
+  git diff HEAD > ../upstream.patch
   git clean -fdx
   git reset --hard HEAD
+  git remote add upstream https://github.com/mongodb/mongo-cxx-driver
+  git fetch upstream
+  CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
+  git checkout upstream/debian/unstable
+  git checkout ${CURRENT_BRANCH}
+  git checkout upstream/debian/unstable -- ./debian/
   if [ -s ../upstream.patch ]; then
     [ -d debian/patches ] || mkdir debian/patches
     mv ../upstream.patch debian/patches/
@@ -33,26 +38,21 @@ if [ "${IS_PATCH}" = "true" ]; then
     git commit -m 'Evergreen patch build - upstream changes'
     git log -n1 -p
   fi
-  if [ -s ../debian.patch ]; then
-    git apply --index ../debian.patch
-    git commit -m 'Evergreen patch build - Debian packaging changes'
-    git log -n1 -p
-  fi
 fi
 if [ "${DEB_BUILD_PROFILES#*pkg.mongo-cxx-driver.mnmlstc}" != "${DEB_BUILD_PROFILES}" ]; then
-   MNMLSTC_DEPS="git ca-certificates"
    MNMLSTC_INCLUDE="-I/usr/include/bsoncxx/v_noabi/bsoncxx/third_party/mnmlstc "
 fi
 
+export CURRENT_BRANCH="$(git rev-parse --abbrev-ref HEAD)"
 
 cd ..
 
 git clone https://salsa.debian.org/installer-team/debootstrap.git debootstrap.git
 export DEBOOTSTRAP_DIR=`pwd`/debootstrap.git
-sudo -E ./debootstrap.git/debootstrap unstable ./unstable-chroot/ http://cdn-aws.deb.debian.org/debian
+sudo -E ./debootstrap.git/debootstrap --variant=buildd unstable ./unstable-chroot/ http://cdn-aws.deb.debian.org/debian
 cp -a mongo-cxx-driver ./unstable-chroot/tmp/
 sudo DEB_BUILD_PROFILES="${DEB_BUILD_PROFILES}" chroot ./unstable-chroot /bin/bash -c "
-  (apt-get install -y build-essential git-buildpackage fakeroot debhelper pkg-config cmake curl ca-certificates libboost-dev libsasl2-dev libutf8proc-dev doxygen ${MNMLSTC_DEPS} && \
+  (apt-get install -y ca-certificates cmake debhelper doxygen git libboost-dev libsasl2-dev libsnappy-dev libssl-dev libutf8proc-dev pkgconf zlib1g-dev build-essential curl fakeroot furo git-buildpackage python3-sphinx python3-sphinx-design && \
   mkdir /tmp/mongo-c-driver && \
   curl -o deb.tar.gz -L https://s3.amazonaws.com/mciuploads/mongo-c-driver/master/mongo-c-driver-debian-packages-latest.tar.gz && \
   tar zxvf deb.tar.gz && \
@@ -63,7 +63,13 @@ sudo DEB_BUILD_PROFILES="${DEB_BUILD_PROFILES}" chroot ./unstable-chroot /bin/ba
   git reset --hard HEAD && \
   python3 etc/calc_release_version.py > build/VERSION_CURRENT && \
   git add --force build/VERSION_CURRENT && \
-  git commit build/VERSION_CURRENT -m 'Set current version' && \
+  git remote remove upstream || true && \
+  git remote add upstream https://github.com/mongodb/mongo-cxx-driver && \
+  git fetch upstream && \
+  git checkout upstream/debian/unstable && \
+  git checkout ${CURRENT_BRANCH} && \
+  git checkout upstream/debian/unstable -- ./debian/ && \
+  git commit -m 'fetch debian directory from the debian/unstable branch' && \
   LANG=C /bin/bash -x ./debian/build_snapshot.sh && \
   debc ../*.changes && \
   dpkg -i ../*.deb && \