• Duy Nguyen's avatar
    clone: fix up delay cloning conditions · 90498161
    Duy Nguyen authored
    6f48d39f (clone: delay cloning until after remote HEAD checking -
    2012-01-16) allows us to perform some checks on remote refs before the
    actual cloning happens. But not all transport types support
    this. Remote helper with "import" capability will not return complete
    ref information until fetch is performed and therefore the clone cannot
    be delayed.
    
    foreign_vcs field in struct remote was used to detect this kind of transport
    and save the result. This is a mistake because foreign_vcs is designed
    to override url-based transport detection. As a result, if the same
    "struct transport *" object is used on many different urls and one of
    them attached remote transport, the following urls will be mistakenly
    attached to the same transport. This fault is worked around by dad0b3d8
    (push: do not let configured foreign-vcs permanently clobbered -
    2012-01-23)
    
    To fix this, detect incomplete refs from transport_get_remote_refs()
    by SHA-1. Incomplete ones must have null SHA-1 (*). Then revert
    changes related to foreign_cvs field in 6f48d39f and dad0b3d8.
    
    A good thing from this change is that cloning smart http transport can
    also be delayed. Earlier it falls into the same category "remote
    transport, no delay".
    
    (*) Theoretically if one of the remote refs happens to have null SHA-1,
    it will trigger false alarm and the clone will not be delayed. But
    that chance may be too small for us to pay attention to.
    Signed-off-by: Duy Nguyen's avatarNguyễn Thái Ngọc Duy <pclouds@gmail.com>
    Signed-off-by: default avatarJunio C Hamano <gitster@pobox.com>
    90498161
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