谭俊浩 [off-list ref] writes:

On 17/03/2016 01:24, Junio C Hamano wrote:

quoted

Using ~/.git-credential-cache/credential-cache.sock would not help
at all for existing users, but ~/.git-credential-cache/socket would
interoperate well with users with existing versions of Git, no?

quoted

quoted

Just being curious, and wanting to see the reasoning behind the
design decision the patch series makes in the log message of one of
these patches.

I guess it is better to use /tmp or such instead of $HOME/.* so that
the users home directory won't be flooded by sockets.

The "fallback" being discussed is to see if $XDG can be used (and
use it if so), otherwise see if ~/.git-credential-cache/socket can
be used (and use it if so), otherwise die with a message (see
credential-cache.c).  The order of the falling back may want to be
the other way around, but in either case, the definition of "can be
used" includes "is there already a directory in which we can create
a socket?".

The existing versions have used ~/.git-credential-cache/socket as
the default socket path, so it is reasonable to expect that users
that are already using the feature already have the directory there.

So I do not think there is any "flooded" involved; if the directory
is already there, we can use it to create and use a single socket.
It's not like we'd be creating many random new directories in ~/.