merge(third_party/git): Merge squashed git subtree at v2.23.0

Merge commit '1b593e1ea4' as 'third_party/git'

third_party/git/ci/install-dependencies.sh

@@ -0,0 +1,74 @@
+#!/usr/bin/env bash
+#
+# Install dependencies required to build and test Git on Linux and macOS
+#
+
+. ${0%/*}/lib.sh
+
+P4WHENCE=http://filehost.perforce.com/perforce/r$LINUX_P4_VERSION
+LFSWHENCE=https://github.com/github/git-lfs/releases/download/v$LINUX_GIT_LFS_VERSION
+
+case "$jobname" in
+linux-clang|linux-gcc)
+	sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
+	sudo apt-get -q update
+	sudo apt-get -q -y install language-pack-is libsvn-perl apache2
+	case "$jobname" in
+	linux-gcc)
+		sudo apt-get -q -y install gcc-8
+		;;
+	esac
+
+	mkdir --parents "$P4_PATH"
+	pushd "$P4_PATH"
+		wget --quiet "$P4WHENCE/bin.linux26x86_64/p4d"
+		wget --quiet "$P4WHENCE/bin.linux26x86_64/p4"
+		chmod u+x p4d
+		chmod u+x p4
+	popd
+	mkdir --parents "$GIT_LFS_PATH"
+	pushd "$GIT_LFS_PATH"
+		wget --quiet "$LFSWHENCE/git-lfs-linux-amd64-$LINUX_GIT_LFS_VERSION.tar.gz"
+		tar --extract --gunzip --file "git-lfs-linux-amd64-$LINUX_GIT_LFS_VERSION.tar.gz"
+		cp git-lfs-$LINUX_GIT_LFS_VERSION/git-lfs .
+	popd
+	;;
+osx-clang|osx-gcc)
+	export HOMEBREW_NO_AUTO_UPDATE=1 HOMEBREW_NO_INSTALL_CLEANUP=1
+	# Uncomment this if you want to run perf tests:
+	# brew install gnu-time
+	test -z "$BREW_INSTALL_PACKAGES" ||
+	brew install $BREW_INSTALL_PACKAGES
+	brew link --force gettext
+	brew install caskroom/cask/perforce
+	case "$jobname" in
+	osx-gcc)
+		brew link gcc@8
+		;;
+	esac
+	;;
+StaticAnalysis)
+	sudo apt-get -q update
+	sudo apt-get -q -y install coccinelle
+	;;
+Documentation)
+	sudo apt-get -q update
+	sudo apt-get -q -y install asciidoc xmlto
+
+	test -n "$ALREADY_HAVE_ASCIIDOCTOR" ||
+	gem install --version 1.5.8 asciidoctor
+	;;
+esac
+
+if type p4d >/dev/null && type p4 >/dev/null
+then
+	echo "$(tput setaf 6)Perforce Server Version$(tput sgr0)"
+	p4d -V | grep Rev.
+	echo "$(tput setaf 6)Perforce Client Version$(tput sgr0)"
+	p4 -V | grep Rev.
+fi
+if type git-lfs >/dev/null
+then
+	echo "$(tput setaf 6)Git-LFS Version$(tput sgr0)"
+	git-lfs version
+fi