From Get docs
git-update-server-info - Update auxiliary info file to help dumb servers
A dumb server that does not do on-the-fly pack generations must have some auxiliary information files in $GIT_DIR/info and $GIT_OBJECT_DIRECTORY/info directories to help clients discover what references and packs the server has. This command generates such auxiliary files.
Currently the command updates the following files. Please see gitrepository-layout for description of what they are for:
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Licensed under the MIT License.