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revlog: skeleton support for version 2 revlogs...
revlog: skeleton support for version 2 revlogs There are a number of improvements we want to make to revlogs that will require a new version - version 2. It is unclear what the full set of improvements will be or when we'll be done with them. What I do know is that the process will likely take longer than a single release, will require input from various stakeholders to evaluate changes, and will have many contentious debates and bikeshedding. It is unrealistic to develop revlog version 2 up front: there are just too many uncertainties that we won't know until things are implemented and experiments are run. Some changes will also be invasive and prone to bit rot, so sitting on dozens of patches is not practical. This commit introduces skeleton support for version 2 revlogs in a way that is flexible and not bound by backwards compatibility concerns. An experimental repo requirement for denoting revlog v2 has been added. The requirement string has a sub-version component to it. This will allow us to declare multiple requirements in the course of developing revlog v2. Whenever we change the in-development revlog v2 format, we can tweak the string, creating a new requirement and locking out old clients. This will allow us to make as many backwards incompatible changes and experiments to revlog v2 as we want. In other words, we can land code and make meaningful progress towards revlog v2 while still maintaining extreme format flexibility up until the point we freeze the format and remove the experimental labels. To enable the new repo requirement, you must supply an experimental and undocumented config option. But not just any boolean flag will do: you need to explicitly use a value that no sane person should ever type. This is an additional guard against enabling revlog v2 on an installation it shouldn't be enabled on. The specific scenario I'm trying to prevent is say a user with a 4.4 client with a frozen format enabling the option but then downgrading to 4.3 and accidentally creating repos with an outdated and unsupported repo format. Requiring a "challenge" string should prevent this. Because the format is not yet finalized and I don't want to take any chances, revlog v2's version is currently 0xDEAD. I figure squatting on a value we're likely never to use as an actual revlog version to mean "internal testing only" is acceptable. And "dead" is easily recognized as something meaningful. There is a bunch of cleanup that is needed before work on revlog v2 begins in earnest. I plan on doing that work once this patch is accepted and we're comfortable with the idea of starting down this path.
Mathias De Maré - - Load All Authors

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dockerrpm
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Mads Kiilerich
dockerrpm: check that docker is running correctly before building
 r22438 #!/bin/bash -e
Matt Mackall
build: initial support for in-tree autobuilding recipes
 r21255
Augie Fackler
dockerlib: start extracting common functions for setting up docker...
 r24968 . $(dirname $0)/dockerlib.sh
Matt Mackall
build: initial support for in-tree autobuilding recipes
 r21255 BUILDDIR=$(dirname $0)
Augie Fackler
dockerlib: extract initcontainer() method...
 r24969 export ROOTDIR=$(cd $BUILDDIR/..; pwd)
Matt Mackall
build: initial support for in-tree autobuilding recipes
 r21255
Augie Fackler
dockerlib: start extracting common functions for setting up docker...
 r24968 checkdocker
Mads Kiilerich
dockerrpm: check that docker is running correctly before building
 r22438
Mads Kiilerich
dockerrpm: better handling of specification of docker name
 r22439 PLATFORM="$1"
Mads Kiilerich
docker: add CentOS 5...
 r22443 shift # extra params are passed to buildrpm
Mads Kiilerich
dockerrpm: better handling of specification of docker name
 r22439
Augie Fackler
dockerlib: extract initcontainer() method...
 r24969 initcontainer $PLATFORM
Mads Kiilerich
dockerrpm: run docker build process as the current user, not as root...
 r22440
Mads Kiilerich
dockerrpm: prepare source outside docker and just run rpmbuild inside docker...
 r22441 RPMBUILDDIR=$ROOTDIR/packages/$PLATFORM
Mads Kiilerich
docker: add CentOS 5...
 r22443 contrib/buildrpm --rpmbuilddir $RPMBUILDDIR --prepare $*
Mads Kiilerich
dockerrpm: prepare source outside docker and just run rpmbuild inside docker...
 r22441
DSHARED=/mnt/shared
$DOCKER run -u $DBUILDUSER --rm -v $RPMBUILDDIR:$DSHARED $CONTAINER \
rpmbuild --define "_topdir $DSHARED" -ba $DSHARED/SPECS/mercurial.spec --clean
Mads Kiilerich
dockerrpm: create a yum/dnf repo from the generated rpms...
 r22444
$DOCKER run -u $DBUILDUSER --rm -v $RPMBUILDDIR:$DSHARED $CONTAINER \
createrepo $DSHARED
cat << EOF > $RPMBUILDDIR/mercurial.repo
# Place this file in /etc/yum.repos.d/mercurial.repo
[mercurial]
Mads Kiilerich
buildrpm: fix use of invalid $PLATFORM in mercurial.repo
 r23124 name=Mercurial packages for $PLATFORM
Mads Kiilerich
dockerrpm: create a yum/dnf repo from the generated rpms...
 r22444 # baseurl=file://$RPMBUILDDIR/
Mads Kiilerich
buildrpm: fix use of invalid $PLATFORM in mercurial.repo
 r23124 baseurl=http://hg.example.com/build/$PLATFORM/
Mads Kiilerich
dockerrpm: create a yum/dnf repo from the generated rpms...
 r22444 skip_if_unavailable=True
gpgcheck=0
enabled=1
EOF
echo
echo "Build complete - results can be found in $RPMBUILDDIR"