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|
// file : UPGRADE.cli
// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
"
At this point we assume that you have the build2 toolchain installed and would
like to upgrade it to a newer version. We also expect that you have the
toolchain \c{bpkg} configuration in the \c{build2-toolchain-X.Y/} directory,
as produced by the bootstrap process. If you don't have the \c{bpkg}
configuration but do have the toolchain installed somehow (for example, using
your distribution's package manager), then you can create the configuration as
shown at the end. If you have neither, then you will need to go through the
bootstrap process.
There are two ways to upgrade: dirty (but quick) and staged (but more
involved). In the \i{dirty upgrade} we override the existing installation
without first uninstalling it. If some installed files no longer exist in the
new version, they will remain \"installed\" until cleaned up manually. Also,
with this approach we never get a chance to make sure the new build is
functional.
In the \i{staged upgrade} we first install a \c{-stage} build of the new
toolchain (similar to what we did during bootstrap), test it, uninstall the
old toolchain, install the new toolchain as \"final\", and finally uninstall
\c{-stage}.
We recommend that you use a dirty upgrade for bugfix-only releases (the same
\c{X.Y} (\c{MAJOR.MINOR}) version) and a staged upgrade otherwise. With
bugfix-only releases we guarantee not to alter the installation file set. Note
also that without periodic upgrades your version of the toolchain may become
too old to be able to upgrade itself. In this case you will have to fall back
onto the bootstrap process.
The dirty upgrade is fairly simple:
\
$ cd build2-toolchain-X.Y
$ bpkg fetch
$ bpkg build build2 bpkg
$ bpkg install build2 bpkg
\
You may also want to issue the \c{status} command after \c{fetch} to examine
which versions are available. By default \c{bpkg} will upgrade to the latest
available but you can override this by specifying the desired version
explicitly, for example:
\
$ bpkg status build2 bpkg
build2: configured 1.0.0; available 1.0.1 2.0.0
bpkg: configured 1.0.0; available 1.0.1 2.0.0
$ bpkg build build2/1.0.1 bpkg/1.0.1
\
The staged upgrade consists of several steps:
\dl|
\li|0. Check for Updates\n
There is no harm in running \c{bpkg fetch} in the existing configuration so
we can use it to determine if any updates are available, whether we can use
the simpler dirty upgrade, and, if not, the target \c{X.Y} (\c{MAJOR.MINOR})
version for the staged upgrade:
\
$ cd build2-toolchain-X.Y
$ bpkg fetch
$ bpkg status build2 bpkg
\
Let's say the new version is X.Z.
|
\li|\n1. Create New Configuration\n
First we make a copy of the old configuration. We will need the original later
to cleanly uninstall the old toolchain, and, maybe, to rollback the
installation if the new version doesn't work out.
\
$ cd ..
$ cp -rp build2-toolchain-X.Y build2-toolchain-X.Z
\
Or, using Windows command prompt:
\
> cd ..
> xcopy /s /q /i build2-toolchain-X.Y build2-toolchain-X.Z
\
|
\li|\n2. Build and Install as \c{-stage}\n
This step is similar to the dirty upgrade except we use the copied
configuration and install the toolchain with the \c{-stage} suffix:
\
$ cd build2-toolchain-X.Z
$ bpkg build build2 bpkg
$ bpkg install \
config.bin.suffix=-stage \
config.install.data_root=root/stage \
build2 bpkg
\
|
\li|\n3. Test Staged\n
Now you can test the new toolchain on your projects, etc. Remember to use the
\c{-stage}-suffixed binaries (\c{bpkg-stage} will automatically use
\c{b-stage}):
\
$ b-stage --version
$ bpkg-stage --version
\
|
\li|\n4. Uninstall Old, Install New\n
Once we are satisfied that the new toolchain works, we can uninstall the old
one and install the new one:
\
$ cd ../build2-toolchain-X.Y
$ bpkg uninstall build2 bpkg
$ cd ../build2-toolchain-X.Z
$ bpkg-stage install build2 bpkg
\
|
\li|\n5. Uninstall Staged\n
Finally, we clean up by removing the staged toolchain (hint: use the command
line history to find the corresponding \c{install} command and change it to
\c{uninstall}):
\
$ bpkg uninstall \
config.bin.suffix=-stage \
config.install.data_root=root/stage \
build2 bpkg
\
You can also remove the old configuration in \c{build2-toolchain-X.Y/} if you
think you no longer need it.
||
If you ever need to (re-)create the \c{bpkg} configuration for the toolchain
from scratch, it is fairly simple (you may need to adjust the compiler,
options, installation directory, etc; see the bootstrap steps for details):
For UNIX-like operating systems (GNU/Linux, Mac OS X, FreeBSD, etc):
\
$ bpkg-stage create \
cc \
config.cxx=g++ \
config.cc.coptions=-O3 \
config.bin.rpath=/usr/local/lib \
config.install.root=/usr/local \
config.install.sudo=sudo
\
For Windows with MSVC (from the Visual Studio command prompt):
\
> bpkg-stage create ^
cc ^
config.cxx=cl ^
\"config.cc.coptions=/O2 /Oi\" ^
config.install.root=C:\build2
\
For Windows with MinGW (from the command prompt):
\
> bpkg-stage create ^
cc ^
config.cxx=g++ ^
config.cc.coptions=-O3 ^
config.install.root=C:\build2
\
"
|
