This can be accomplished in one of two ways:
1) Pull the file from your device:cd /your/repo/path
adb pull /system/etc/build-manifest.xml .repo/manifests/cm-10.0.0.xml
OR
2) Extract /system/etc/build-manifest.xml from the ROM zip and place it manually.
等于这样你就有了这个版本CM build的manifests.xml。
Enabling the Manifest
Switch to this new manifest and enable it by typing:repo init -m cm-10.0.0.xml
repo sync
To go back to mainline:repo init -m default.xml
repo sync
-m就是使用本地文件，-u就是使用URL了。