Mercurial > hg
view contrib/Makefile.python @ 50316:87f0155d68aa stable
revlog: improve the robustness of the splitting process
The previous "in-place" splitting, preserving the splitting on transaction
failure had a couple of issue in case of transaction rollback:
- a race windows that could still lead to a crash and data loss
- it corrupted the `fncache`.
So instead, we use a new approach that we summarized as "we do a backup of the
inline revlog pre-split, and we restore this in case of failure".
To make readers live easier, we don't overwrite the inline index file until
transaction finalization. (once the transaction get into its finalization phase,
it is not expected to rollback, unless some crash happens).
To do so, we write the index of the split index in a temporary file that we use
until transaction finalization. We also keep a backup of the initial inline file
to be able to rollback the split if needed.
As a result, transaction rollback cancel the split and no longer corrupt
fncache. We also no longer have a small inconsistency windows where the
transaction could be unrecoverable.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Mon, 20 Mar 2023 11:52:17 +0100 |
parents | ae68418cc3a1 |
children |
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PYTHONVER=2.7.16 PYTHONNAME=python- PREFIX=$(HOME)/bin/prefix-$(PYTHONNAME)$(PYTHONVER) SYMLINKDIR=$(HOME)/bin help: @echo @echo 'Make a custom installation of a Python version' @echo @echo 'Common make parameters:' @echo ' PYTHONVER=... [$(PYTHONVER)]' @echo ' PREFIX=... [$(PREFIX)]' @echo ' SYMLINKDIR=... [$(SYMLINKDIR) creating $(PYTHONNAME)$(PYTHONVER)]' @echo @echo 'Common make targets:' @echo ' python - install Python $$PYTHONVER in $$PREFIX' @echo ' symlink - create a $$SYMLINKDIR/$(PYTHONNAME)$$PYTHONVER symlink' @echo @echo 'Example: create a temporary Python installation:' @echo ' $$ make -f Makefile.python python PYTHONVER=${PYTHONVER} PREFIX=/tmp/p27' @echo ' $$ /tmp/p27/bin/python -V' @echo ' Python 2.7' @echo @echo 'Some external libraries are required for building Python: zlib bzip2 openssl.' @echo 'Make sure their development packages are installed systemwide.' # fedora: yum install zlib-devel bzip2-devel openssl-devel # debian: apt-get install zlib1g-dev libbz2-dev libssl-dev @echo @echo 'To build a nice collection of interesting Python versions:' @echo ' $$ for v in 2.{6{,.1,.2,.9},7{,.8,.10}}; do' @echo ' make -f Makefile.python symlink PYTHONVER=$$v || break; done' @echo 'To run a Mercurial test on all these Python versions:' @echo ' $$ for py in `cd ~/bin && ls $(PYTHONNAME)2.*`; do' @echo ' echo $$py; $$py run-tests.py test-http.t; echo; done' @echo export LANGUAGE=C export LC_ALL=C python: $(PREFIX)/bin/python docutils printf 'import sys, zlib, bz2, docutils, ssl' | $(PREFIX)/bin/python PYTHON_SRCDIR=Python-$(PYTHONVER) PYTHON_SRCFILE=$(PYTHON_SRCDIR).tgz $(PREFIX)/bin/python: [ -f $(PYTHON_SRCFILE) ] || wget http://www.python.org/ftp/python/$(PYTHONVER)/$(PYTHON_SRCFILE) || curl -OL http://www.python.org/ftp/python/$(PYTHONVER)/$(PYTHON_SRCFILE) || [ -f $(PYTHON_SRCFILE) ] rm -rf $(PYTHON_SRCDIR) tar xf $(PYTHON_SRCFILE) # Debian/Ubuntu disables SSLv2,3 the hard way, disable it on old Pythons too -sed -i 's,self.*SSLv[23]_method(),0;//\0,g' $(PYTHON_SRCDIR)/Modules/_ssl.c # Find multiarch system libraries on Ubuntu and disable fortify error when setting argv LDFLAGS="-L/usr/lib/`dpkg-architecture -qDEB_HOST_MULTIARCH`"; \ BASECFLAGS=-U_FORTIFY_SOURCE; \ export LDFLAGS BASECFLAGS; \ cd $(PYTHON_SRCDIR) && ./configure --prefix=$(PREFIX) && make all SVNVERSION=pwd && make install printf 'import sys, zlib, bz2, ssl' | $(PREFIX)/bin/python rm -rf $(PYTHON_SRCDIR) DOCUTILSVER=0.12 DOCUTILS_SRCDIR=docutils-$(DOCUTILSVER) DOCUTILS_SRCFILE=$(DOCUTILS_SRCDIR).tar.gz docutils: $(PREFIX)/bin/python @$(PREFIX)/bin/python -c 'import docutils' || ( set -ex; \ [ -f $(DOCUTILS_SRCFILE) ] || wget http://downloads.sourceforge.net/project/docutils/docutils/$(DOCUTILSVER)/$(DOCUTILS_SRCFILE) || [ -f $(DOCUTILS_SRCFILE) ]; \ rm -rf $(DOCUTILS_SRCDIR); \ tar xf $(DOCUTILS_SRCFILE); \ cd $(DOCUTILS_SRCDIR) && $(PREFIX)/bin/python setup.py install --prefix=$(PREFIX); \ $(PREFIX)/bin/python -c 'import docutils'; \ rm -rf $(DOCUTILS_SRCDIR); ) symlink: python $(SYMLINKDIR) ln -sf $(PREFIX)/bin/python $(SYMLINKDIR)/$(PYTHONNAME)$(PYTHONVER) .PHONY: help python docutils symlink