docs/howto_SDK_git_cygwin.txt

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Subject: How to get the android source code using Cygwin and Git
Date:    2009/04/27



Table of content:
  1- Goals and Requirements
  2- Getting the code, the simple way
  3- SSH issues
  4- Advanced Tricks


-------------------------
1- Goals and Requirements
-------------------------

This document explains how to checkout the Android source from the git
repositories under Windows.

As stated in development/docs/howto_build_SDK.txt, one can't build the whole
Android source code under Windows. You can only build a the SDK tools for
Windows.

There are a number of caveats in checking out the code from Git under Windows. 
This document tries to explain them.

First you will need to meet the following requirements:
- You must have Cygwin installed.
  See http://www.cygwin.com/

- You must install Cyginw using the "Unix / Binary" mode.
  If you don't do that, git will fail to properly compute some SHA1 keys.

- You need the "git" and "curl" packages to checkout the code.
  If you plan to contribute, you might want to get "gitk" also.

  Note: if you want to build the SDK, check the howto_build_SDK.txt file
  for a list of extra required packages.


-----------------------------------
2- Getting the code, the simple way
-----------------------------------

Out of the box, "repo" and "git" will work just fine under Cygwin:

  $ repo init -u git://android.git.kernel.org/platform/manifest.git
  $ repo sync

And you're done. You can build as explained in howto_build_SDK.txt and ignore
the rest of this document.


-------------
3- SSH issues
-------------

If you maintain your own private repository using an SSH server, you might get
some "mux/ssh" errors. In this case try this:

  $ repo init -u ssh://my.private.ssh.repo/platform/manifest.git
  $ export GIT_SSH=ssh
  $ repo sync


------------------
4- Advanced Tricks
------------------

There are two remaining issues with the default repo/git options:

A- If you plan on contributing, you will notice that even after a fresh "repo
sync" some projects are marked as having modified files. This happens on the
"bionic" and the "external/iptables" project. The issue is that they have files
which have the same name yet differ only by their case-sensitivity. Since the
Windows filesystem is not case-sensitive, this confuses Git.

Solution: we can simply ignore these projects as they are not needed to build
the Windows SDK.

To do this you just need to create a file .repo/local_manifest.xml that
provides a list of projects to ignore:

<?xml version="1.0" encoding="UTF-8"?>
<manifest>
  <remove-project name="platform/bionic" />
  <remove-project name="platform/external/iptables" />
</manifest>


B- The other issue is that by default repo maintains around 100+ git projects. 
However most of these are not needed to build the Windows SDK. We can easily
reduce this list to around 70 projects, which will make your repo syncs a lot
faster.

Solution: Simply ignore all projects bionic, bootable/*, hardware/* and most
external projects. For external, we still need a handful of projects for the
SDK -- things like the emulator or sqlite can be quite useful :-)

Here's a script that takes care of all these details. It performs the repo
init, creates the appropriate local_manifest.xml and does a repo sync as
needed:

------------
#!/bin/bash

set -e  # fail on errors

URL=git://android.git.kernel.org/platform/manifest.git
BRANCH=donut

# repo init if there's no .repo directory
if [[ ! -d .repo ]]; then
    repo init -u $URL -b $BRANCH
fi

# create a local_manifest to exclude projects not useful to the Windows SDK
L=.repo/local_manifest.xml
if [[ ! -f $L ]]; then
    M=.repo/manifest.xml

    cat > $L <<EOF
<?xml version="1.0" encoding="UTF-8"?>
<manifest>
EOF

    for i in $(sed -sn '/external\/\(apache\|expat\|g\|libpng\|pr\|qemu\|sqlite\|tag\|zlib\)/d;/\(bionic\|bootable\|cts\|external\|hardware\).* name/s/^.*name="\([^"]\+\)".*/\1/p' $M) ; do
        echo "Ignore project $i"
        echo "  <remove-project name=\"$i\" />" >> $L
    done

    cat >> $L <<EOF2
</manifest>
EOF2
fi

[[ $URL != ${URL/ssh/} ]] && export GIT_SSH=ssh
repo sync
------------


Simply extract this to a "my_sync.sh" file and try the following:
  $ mkdir android_src
  $ cd android_src
  $ chmod +x mysync.sh
  $ ./mysync.sh


-end-