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You may wish to use the new [[Metro/AutoSetup|autosetup]] script which uses a curses based menu and allows for quickly setting up and running builds base on your choices without requiring any manual steps. Please see the [[Metro AutoSetup]] page for more details.
== Arch and Subarch == <!--T:41-->
In the following example we are creating a pentium4 stage 3 compiled for x86-32bit binary compatibility. Pentium4 is a subarch of the x86-32bit architecture. Once you have metro installed you may find a full list of each subarch in your {{f|/var/git/meta-repo/kits/core-kit/profiles/funtoo-1.0/linux-gnu/arch/x86-32bit/subarch}} directory:
# ##i##ls /var/git/meta-repo/kits/core-kit/profiles/funtoo/1.0/linux-gnu/arch/x86-32bit/subarch/
amd64-k8+sse3_32 athlon-4 athlon-xp core2_32 i486 k6-2 pentium pentium2 pentiumpro
amd64-k8_32 athlon-mp atom_32 generic_32 i686 k6-3 pentium-m pentium3 prescott
athlon athlon-tbird btver1 geode k6 native_32 pentium-mmx pentium4 xen-pentium4+sse3
64-bit PC profiles can be found in the {{f|/var/git/meta-repo/kits/core-kit/profiles/funtoo/1.0/linux-gnu/arch/x86-64bit/subarch/}} directory:
# ##i##ls /var/git/meta-repo/kits/core-kit/profiles/funtoo/1.0/linux-gnu/arch/x86-64bit/subarch/
amd64-bulldozer amd64-k8+sse3 btver1_64 generic_64 intel64-nehalem native_64
amd64-jaguar amd64-piledriver core-avx-i intel64-broadwell intel64-sandybridge nocona
amd64-k10 amd64-steamroller core2_64 intel64-haswell intel64-silvermont opteron_64
amd64-k8 atom_64 corei7 intel64-ivybridge intel64-westmere xen-pentium4+sse3_64
= First stages build (local build) = <!--T:43-->
To get this all started, we need to bootstrap the process by downloading an initial seed stage3 to use for building and place it in its proper location in {{f|/home/mirror/funtoo}}, so that Metro can find it. We will also need to create some special &quot;control&quot; files in {{f|/home/mirror/funtoo}}, which will allow Metro to understand how it is supposed to proceed.
== Step 1: Set up pentium4 repository (local build) == <!--T:45-->
Assuming we're following the basic steps outlined in the previous section, and building {{f|funtoo-current}} build for the {{f|pentium4}}, using a generic {{f|pentium4}} stage3 as a seed stage, then here the first set of steps we'd perform:
# ##i##install -d /home/mirror/funtoo/funtoo-current/x86-32bit/pentium4
# ##i##install -d /home/mirror/funtoo/funtoo-current/snapshots
# ##i##cd /home/mirror/funtoo/funtoo-current/x86-32bit/pentium4
# ##i##install -d 2017-10-01
# ##i##cd 2017-10-01
# ##i##wget -c
# ##i##cd ..
# ##i##install -d .control/version
# ##i##echo "2017-10-01" > .control/version/stage3
# ##i##install -d .control/strategy
# ##i##echo local > .control/strategy/build
# ##i##echo stage3 > .control/strategy/seed
OK, let's review the steps above. First, we create the directory {{f|/home/mirror/funtoo/funtoo-current/x86-32bit/pentium4}}, which is where Metro will expect to find {{f|funtoo-current}} pentium4 builds -- it is configured to look here by default. Then we create a specially-named directory to house our seed x86 stage3. Again, by default, Metro expects the directory to be named this way. We enter this directory, and download our seed x86 stage3 from Note that the {{f|2017-10-01}} version stamp matches. Make sure that your directory name matches the stage3 name too. Everything has been set up to match Metro's default filesystem layout.
Next, we go back to the {{f|/home/mirror/metro/funtoo-current/x86-32bit/pentium4}} directory, and inside it, we create a {{f|.control}} directory. This directory and its subdirectories contain special files that Metro references to determine certain aspects of its behavior. The {{f|.control/version/stage3}} file is used by Metro to track the most recently-built stage3 for this particular build and subarch. Metro will automatically update this file with a new version stamp after it successfully builds a new stage3. But because Metro didn't actually ''build'' this stage3, we need to set up the {{f|.control/version/stage3}} file manually. This will allow Metro to find our downloaded stage3 when we set up our pentium4 build to use it as a seed. Also note that Metro will create a similar {{f|.control/version/stage1}} file after it successfully builds an pentium4 funtoo-current stage1.
We also set up {{f|.control/strategy/build}} and {{f|.control/strategy/seed}} files with values of {{f|local}} and {{f|stage3}} respectively. These files define the building strategy Metro will use when we build pentium4 funtoo-current stages. With a build strategy of {{f|local}}, Metro will source its seed stage from funtoo-current pentium4, the current directory. And with a seed strategy of {{f|stage3}}, Metro will use a stage3 as a seed, and use this seed to build a new stage1, stage2 and stage3.
== Step 2: Building the pentium4 stages == <!--T:51-->
Incidentally, if all you wanted to do at this point was to build a new pentium4 funtoo-current stage1/2/3 (plus openvz and vserver templates). You would begin the process by typing:
# ##i##cd /root/metro
# ##i##scripts/ funtoo-current x86-32bit pentium4
If you have a slow machine, it could take several hours to be completed because several "heavy" components like gcc or glibc have to be recompiled in each stage. Once a stage has been successfully completed, it is placed in the {{f|"${METRO_MIRROR}/funtoo-current/x32-bit/pentium4/YYYY-MM-DD"}} subdirectory, where {{f|YYYY-MM-DD}} is today's date at the time the {{f|}} script was started or the date you put on the command line.
= Building for another binary compatible architecture (remote build) = <!--T:55-->
As written above, Metro is able to perform '''remote build''' building different architecture stage3 from a binary compatible seeding stage3 (e.g. using a pentium4 stage3 to seed a <tt>Intel Core2 32bits</tt> stage3).
In the Metro terminology this is called a '''remote build''' (a stage 3 of a different, but binary compatible, architecture is used as a seed).
What's not compatible? You can't use a <tt>Sparc</tt> architecture to generate an <tt>x86</tt> or <tt>ARM</tt> based stage and vice-versa. If you use a 32bit stage then you don't want to seed a 64bit build from it. Be sure that you are using a stage from the same architecture that you are trying to seed. Check [ Funtoo-current FTP Mirror] for a stage that is from the same Architecture that you will be building.
{{Note|Often, one build (ie. funtoo-current) can be used as a seed for another build such as funtoo-stable. However, hardened builds require hardened stages as seeds in order for the build to complete successfully.}}
== Step 1: Set up Core_2 32bit repository == <!--T:59-->
In this example, we're going to use this pentium4 funtoo-current stage3 to seed a new Core_2 32bit funtoo-current build. To get that done, we need to set up the pentium4 build directory as follows:
# ##i## cd /home/mirror/funtoo/funtoo-current/x86-32bit
# ##i##install -d core2_32
# ##i##cd core2_32
# ##i##install -d .control/strategy
# ##i##echo remote > .control/strategy/build
# ##i##echo stage3 > .control/strategy/seed
# ##i##install -d .control/remote
# ##i##echo funtoo-current > .control/remote/build
# ##i##echo x86-32bit > .control/remote/arch_desc
# ##i##echo pentium4 > .control/remote/subarch
The steps we follow are similar to those we performed for a ''local build'' to set up our pentium4 directory for local build. However, note the differences. We didn't download a stage, because we are going to use the pentium4 stage to build a new Core_2 32bit stage. We also didn't create the <tt>.control/version/stage{1,3}</tt> files because Metro will create them for us after it successfully builds a new stage1 and stage3. We are still using a <tt>stage3</tt> seed strategy, but we've set the build strategy to <tt>remote</tt>, which means that we're going to use a seed stage that's not from this particular subdirectory. Where are we going to get it from? The <tt>.control/remote</tt> directory contains this information, and lets Metro know that it should look for its seed stage3 in the <tt>/home/mirror/funtoo/funtoo-current/x86-32bit/pentium4</tt> directory. Which one will it grab? You guessed it -- the most recently built ''stage3'' (since our seed strategy was set to <tt>stage3</tt>) that has the version stamp of <tt>2010-12-24</tt>, as recorded in <tt>/home/mirror/funtoo-current/x86-32bit/pentium4/.control/version/stage</tt>. Now you can see how all those control files come together to direct Metro to do the right thing.
{{Note|<code>arch_desc</code> should be set to one of: <code>x86-32bit</code>, <code>x86-64bit</code> or <code>pure64</code> for PC-compatible systems. You must use a 32-bit build as a seed for other 32-bit builds, and a 64-bit build as a seed for other 64-bit builds.}}
== Step 2: Building the Core_2 32bit stages == <!--T:64-->
Now, you could start building your new Core_2 32bit stage1/2/3 (plus openvz and vserver templates) by typing the following:
# ##i##/root/metro/scripts/ funtoo-current x86-32bit core2_32
In that case, the produced stages are placed in the <tt>/home/mirror/funtoo/funtoo-current/x32-bit/core2_32/YYYY-MM-DD</tt> subdirectory.
== Step 3: The Next Build == <!--T:68-->
At this point, you now have a new Core_2 32bit stage3, built using a "remote" pentium4 stage3. Once the first remote build completes successfully, metro will automatically change {{c|.control/strategy/build}} to be {{c|local}} instead of {{c|remote}}, so it will use the most recently-built Core_2 32bit stage3 as a seed for any new Core_2 32bit builds from now on.
= Build your own tailored stage3 = <!--T:70-->
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