git ls-remote --heads <repo-url>
git ls-remote user page .
For example, for git, the git git repo branches use
$git ls-remote --heads git://github.com/git/git.git 121f71f0da1bc9a4e1e96be2c3e683191a82a354 refs/heads/maint f623ca1cae600e97cb0b38131fdd33e4fb669cf8 refs/heads/master 8e148144574e6c6511b591286e44a677a260d760 refs/heads/next fcdb578342aeaf355c296026af08093b20aab9b4 refs/heads/pu 5321cb29c8f709669c5e4a04f502cd984623592c refs/heads/todo
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