Add support for GIT_ONE_FILESYSTEM
This patch makes git pay attention to the GIT_ONE_FILESYSTEM environment variable. When that variable is set, git will stop searching for a GIT_DIR when it attempts to cross a filesystem boundary. When working in an environment with too many automount points to make maintaining a GIT_CEILING_DIRECTORIES list enjoyable, GIT_ONE_FILESYSTEM gives the option of turning all such attempts off with one setting. Signed-off-by: NLars R. Damerow <lars@pixar.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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