Here is the problem, you need to merge some works from “stable” branch in “repo1″ to your current “master” branch. Below are the steps you do.
First of all, add a remote repository

git remote add foo git@example.com:foo/repo1.git

then download objects and refs from that newly added remote repository

git fetch foo

now checkout the branch which will you merge

git checkout --track -b stable foo/stable

swith to “stable” branch and check that everything is good to go

git checkout stable

then you move back to your current directory