packaging: enable rust extensions on centos

Test on CentOS 7, repository with ~170000 tracked files,
    no untracked files:
10 runs with this enabled:
 -- Run  #0 time: 0.6519973278045654
 -- Run  #1 time: 0.6933724880218506
 -- Run  #2 time: 0.7512078285217285
 -- Run  #3 time: 0.7517638206481934
 -- Run  #4 time: 0.5966529846191406
 -- Run  #5 time: 0.5960886478424072
 -- Run  #6 time: 0.5940573215484619
 -- Run  #7 time: 0.5963726043701172
 -- Run  #8 time: 0.6048009395599365
 -- Run  #9 time: 0.603604793548584

10 runs without this enabled:
 -- Run  #0 time: 2.127584457397461
 -- Run  #1 time: 2.066192865371704
 -- Run  #2 time: 2.0831892490386963
 -- Run  #3 time: 2.077716588973999
 -- Run  #4 time: 2.07608962059021
 -- Run  #5 time: 2.072899341583252
 -- Run  #6 time: 2.094369888305664
 -- Run  #7 time: 2.067504644393921
 -- Run  #8 time: 2.069610834121704
 -- Run  #9 time: 2.0567898750305176

Differential Revision: https://phab.mercurial-scm.org/D9294

contrib/packaging/docker/centos7

@@ -1,17 +1,20 b''
 FROM centos:centos7
 
 RUN groupadd -g %GID% build && \
     useradd -u %UID% -g %GID% -s /bin/bash -d /build -m build
 
 RUN yum install -y epel-release
 RUN yum install -y \
 	gcc \
 	gettext \
 	make \
 	python3-devel \
 	python36-docutils \
 	rpm-build \
 	tar
 
 # For creating repo meta data
 RUN yum install -y createrepo
+
+# For rust extensions
+RUN yum install -y cargo

contrib/packaging/docker/centos8

@@ -1,15 +1,18 b''
 FROM centos:centos8
 
 RUN groupadd -g %GID% build && \
     useradd -u %UID% -g %GID% -s /bin/bash -d /build -m build
 
 RUN yum install -y \
 	gcc \
 	gettext \
 	make \
 	python3-devel \
 	python3-docutils \
 	rpm-build
 
 # For creating repo meta data
 RUN yum install -y createrepo
+
+# For rust extensions
+RUN yum install -y cargo

contrib/packaging/mercurial.spec

@@ -1,173 +1,173 b''
 %global emacs_lispdir %{_datadir}/emacs/site-lisp
 
 %define withpython %{nil}
 
 %global pythonexe python3
 %global pythondocutils python3-docutils
 
 %if "%{?withpython}"
 
 %global pythonver %{withpython}
 %global pythonname Python-%{withpython}
 %global docutilsname docutils-0.14
 %global docutilsmd5 c53768d63db3873b7d452833553469de
 %global pythonhg python-hg
 %global hgpyprefix /opt/%{pythonhg}
 # byte compilation will fail on some some Python /test/ files
 %global _python_bytecompile_errors_terminate_build 0
 
 %else
 
 %global pythonver %(%{pythonexe} -c 'import sys;print(".".join(map(str, sys.version_info[:2])))')
 
 %endif
 
 Summary: A fast, lightweight Source Control Management system
 Name: mercurial
 Version: snapshot
 Release: 0
 License: GPLv2+
 Group: Development/Tools
 URL: https://mercurial-scm.org/
 Source0: %{name}-%{version}-%{release}.tar.gz
 %if "%{?withpython}"
 Source1: %{pythonname}.tgz
 Source2: %{docutilsname}.tar.gz
 %endif
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
 
 BuildRequires: make, gcc, gettext
 %if "%{?withpython}"
 BuildRequires: readline-devel, openssl-devel, ncurses-devel, zlib-devel, bzip2-devel
 %else
 BuildRequires: %{pythonexe} >= %{pythonver}, %{pythonexe}-devel, %{pythondocutils}
 Requires: %{pythonexe} >= %{pythonver}
 %endif
 # The hgk extension uses the wish tcl interpreter, but we don't enforce it
 #Requires: tk
 
 %description
 Mercurial is a fast, lightweight source control management system designed
 for efficient handling of very large distributed projects.
 
 %prep
 
 %if "%{?withpython}"
 %setup -q -n mercurial-%{version}-%{release} -a1 -a2
 # despite the comments in cgi.py, we do this to prevent rpmdeps from picking /usr/local/bin/python up
 sed -i '1c#! /usr/bin/env %{pythonexe}' %{pythonname}/Lib/cgi.py
 %else
 %setup -q -n mercurial-%{version}-%{release}
 %endif
 
 %build
 
 export HGPYTHON3=1
 
 %if "%{?withpython}"
 
 PYPATH=$PWD/%{pythonname}
 cd $PYPATH
 ./configure --prefix=%{hgpyprefix}
 make all %{?_smp_mflags}
 cd -
 
 cd %{docutilsname}
 LD_LIBRARY_PATH=$PYPATH $PYPATH/python setup.py build
 cd -
 
 # verify Python environment
 LD_LIBRARY_PATH=$PYPATH PYTHONPATH=$PWD/%{docutilsname} $PYPATH/python -c 'import sys, zlib, bz2, ssl, curses, readline'
 
 # set environment for make
 export PATH=$PYPATH:$PATH
 export LD_LIBRARY_PATH=$PYPATH
 export CFLAGS="-L $PYPATH"
 export PYTHONPATH=$PWD/%{docutilsname}
 
 %endif
 
 make all PYTHON=%{pythonexe}
 make -C contrib/chg
 
 sed -i -e '1s|#!/usr/bin/env python$|#!/usr/bin/env %{pythonexe}|' contrib/hg-ssh
 
 %install
 rm -rf $RPM_BUILD_ROOT
 
 export HGPYTHON3=1
 
 %if "%{?withpython}"
 
 PYPATH=$PWD/%{pythonname}
 cd $PYPATH
 make install DESTDIR=$RPM_BUILD_ROOT
 # these .a are not necessary and they are readonly and strip fails - kill them!
 rm -f %{buildroot}%{hgpyprefix}/lib/{,python2.*/config}/libpython2.*.a
 cd -
 
 cd %{docutilsname}
 LD_LIBRARY_PATH=$PYPATH $PYPATH/python setup.py install --root="$RPM_BUILD_ROOT"
 cd -
 
-PATH=$PYPATH:$PATH LD_LIBRARY_PATH=$PYPATH make install PYTHON=%{pythonexe} DESTDIR=$RPM_BUILD_ROOT PREFIX=%{hgpyprefix} MANDIR=%{_mandir}
+PATH=$PYPATH:$PATH LD_LIBRARY_PATH=$PYPATH make install PYTHON=%{pythonexe} DESTDIR=$RPM_BUILD_ROOT PREFIX=%{hgpyprefix} MANDIR=%{_mandir} PURE="--rust"
 mkdir -p $RPM_BUILD_ROOT%{_bindir}
 ( cd $RPM_BUILD_ROOT%{_bindir}/ && ln -s ../..%{hgpyprefix}/bin/hg . )
 ( cd $RPM_BUILD_ROOT%{_bindir}/ && ln -s ../..%{hgpyprefix}/bin/python2.? %{pythonhg} )
 
 %else
 
-make install PYTHON=%{pythonexe} DESTDIR=$RPM_BUILD_ROOT PREFIX=%{_prefix} MANDIR=%{_mandir}
+make install PYTHON=%{pythonexe} DESTDIR=$RPM_BUILD_ROOT PREFIX=%{_prefix} MANDIR=%{_mandir} PURE="--rust"
 
 %endif
 
 install -m 755 contrib/chg/chg $RPM_BUILD_ROOT%{_bindir}/
 install -m 755 contrib/hgk $RPM_BUILD_ROOT%{_bindir}/
 install -m 755 contrib/hg-ssh $RPM_BUILD_ROOT%{_bindir}/
 
 bash_completion_dir=$RPM_BUILD_ROOT%{_sysconfdir}/bash_completion.d
 mkdir -p $bash_completion_dir
 install -m 644 contrib/bash_completion $bash_completion_dir/mercurial.sh
 
 zsh_completion_dir=$RPM_BUILD_ROOT%{_datadir}/zsh/site-functions
 mkdir -p $zsh_completion_dir
 install -m 644 contrib/zsh_completion $zsh_completion_dir/_mercurial
 
 mkdir -p $RPM_BUILD_ROOT%{emacs_lispdir}
 install -m 644 contrib/mercurial.el $RPM_BUILD_ROOT%{emacs_lispdir}/
 install -m 644 contrib/mq.el $RPM_BUILD_ROOT%{emacs_lispdir}/
 
 mkdir -p $RPM_BUILD_ROOT/%{_sysconfdir}/mercurial/hgrc.d
 
 %clean
 rm -rf $RPM_BUILD_ROOT
 
 %files
 %defattr(-,root,root,-)
 %doc CONTRIBUTORS COPYING doc/README doc/hg*.txt doc/hg*.html *.cgi contrib/*.fcgi contrib/*.wsgi
 %doc %attr(644,root,root) %{_mandir}/man?/hg*
 %doc %attr(644,root,root) contrib/*.svg
 %dir %{_datadir}/zsh/
 %dir %{_datadir}/zsh/site-functions/
 %{_datadir}/zsh/site-functions/_mercurial
 %dir %{_datadir}/emacs/site-lisp/
 %{_datadir}/emacs/site-lisp/mercurial.el
 %{_datadir}/emacs/site-lisp/mq.el
 %{_bindir}/hg
 %{_bindir}/chg
 %{_bindir}/hgk
 %{_bindir}/hg-ssh
 %dir %{_sysconfdir}/bash_completion.d/
 %config(noreplace) %{_sysconfdir}/bash_completion.d/mercurial.sh
 %dir %{_sysconfdir}/mercurial
 %dir %{_sysconfdir}/mercurial/hgrc.d
 %if "%{?withpython}"
 %{_bindir}/%{pythonhg}
 %{hgpyprefix}
 %else
 %{_libdir}/python%{pythonver}/site-packages/%{name}-*-py%{pythonver}.egg-info
 %{_libdir}/python%{pythonver}/site-packages/%{name}
 %{_libdir}/python%{pythonver}/site-packages/hgext
 %{_libdir}/python%{pythonver}/site-packages/hgext3rd
 %{_libdir}/python%{pythonver}/site-packages/hgdemandimport
 %endif