[Nexus 7 (2013) Android Development] GROGG88:
Or he may be referring to a manifest... You can see here: https://github.com/grogg/platform

I am never initializing the AOSP repo, but instead I am initializing my own manifest (default.xml). It is just a modified AOSP manifest that points to my github for multiple repos, and the rest are left as default AOSP repos. Any time I run a repo sync it pulls the following from my github instead of fetching them from android.googlesource.com:

<!-- grogg repos -->
<project path="build" name="platform_build" remote="grogg" revision="lollipop" >
<copyfile src="core/root.mk" dest="Makefile" />
</project>
<project path="device/asus/deb" name="platform_device_asus_deb" remote="grogg" revision="lollipop" />
<project path="device/asus/flo" name="platform_device_asus_flo" remote="grogg" revision="lollipop" />
<project path="device/asus/flo-kernel" name="platform_device_asus_flo-kernel" remote="grogg" revision="lollipop" />
<project path="device/asus/flo-kernel/kernel" name="platform_device_asus_flo-kernel_kernel" remote="grogg" revision="lollipop" />
<project path="device/lge/hammerhead" name="platform_device_lge_hammerhead" remote="grogg" revision="lollipop" />
<project path="device/lge/hammerhead-kernel" name="platform_device_lge_hammerhead-kernel" remote="grogg" revision="lollipop" />
<project path="device/lge/hammerhead-kernel/kernel" name="platform_device_lge_hammerhead-kernel_kernel" remote="grogg" revision="lollipop" />
<project path="external/busybox" name="platform_external_busybox" remote="grogg" revision="lollipop" />
<project path="external/libtruezip" name="platform_external_libtruezip" remote="grogg" revision="lollipop" />
<project path="frameworks/base" name="platform_frameworks_base" remote="grogg" revision="lollipop" />
<project path="packages/apps/Browser" name="platform_packages_apps_Browser" remote="grogg" revision="lollipop" />
<project path="packages/apps/CMFileManager" name="platform_packages_apps_CMFileManager" remote="grogg" revision="lollipop" />
<project path="packages/apps/DeskClock" name="platform_packages_apps_DeskClock" remote="grogg" revision="lollipop" />
<project path="packages/apps/Dialer" name="platform_packages_apps_Dialer" remote="grogg" revision="lollipop" />
<project path="packages/apps/Gallery2" name="platform_packages_apps_Gallery2" remote="grogg" revision="lollipop" />
<project path="packages/apps/Launcher2" name="platform_packages_apps_Launcher2" remote="grogg" revision="lollipop" />
<project path="packages/apps/Settings" name="platform_packages_apps_Settings" remote="grogg" revision="lollipop" />
<project path="packages/apps/ScreenRecorder" name="platform_packages_apps_ScreenRecorder" remote="grogg" revision="lollipop" />
<project path="packages/inputmethods/LatinIME" name="platform_packages_inputmethods_LatinIME" remote="grogg" revision="lollipop" />
<project path="packages/services/Telecomm" name="platform_packages_services_Telecomm" remote="grogg" revision="lollipop" />
<project path="packages/services/Telephony" name="platform_packages_services_Telephony" remote="grogg" revision="lollipop" />
<project path="system/core" name="platform_system_core" remote="grogg" revision="lollipop" />
<project path="vendor" name="platform_vendor" remote="grogg" revision="lollipop" />

The only downside is that I have to manually merge AOSP updates to those repos...