[BUG] tramp (2.5.3-pre HEAD/284851265423e875d6de963922f3deb536aa2882); tramp-repository-version/tramp-repository-branch variables cause git be invoked

[Lin Sun]

Hi,

The const variables tramp-repository-version/tramp-repository-branch will

be initialized with simply (request 'tramp), it chains request "trampver.el".

These two variables it initialized with invoking the `git' program. When

someone (request 'tramp) -> (request 'trampvar), it will cause the 'git'

be invoked twice.

For most of scenario, people don't use these two variables (except

report a tramp bug), always invoking the "git" on initialization is a

wast on performance.

And, it also will trigger an error message when "git" not in the PATH:

> Error running git rev-parse --abbrev-ref: (file-missing "Searching for

> program" "no such file or directory" "git")

No git invoking on the tramp-repository-version/tramp-repository-branch

initializing will help on performance and avoid the error message.

Please help fix this issue. Thanks