commit 93ba3ca3b6e60ca4f80b7377573cc31f3d679284
author Lei YU <yulei.sh@bytedance.com> Thu Apr 30 14:26:29 2020 +0800
committer Lei YU <mine260309@gmail.com> Tue Jun 16 02:15:42 2020 +0000
tree cacbe1f4d084b8354181f7cb08428773c5c45e6f
parent f54a98e2bee8735152ecef4570bc0d38fcba0b2e

build-setup: Use global config to set git proxy

The git-proxy was set as local config, so it only applies for the
openbmc tree.
To make use of the proxy for all the git downloads, make it as global
config, and use the full path instead of adding the directory to the
PATH, because the PATH is not propagated to all stages of the Yocto
build process.

Also set http.proxy as well.

In case there are multiple jobs started simultaneously (e.g. a matrix
configuration project), use flock to protect the race of writing to the
configure files.

Be noted that it sets the .gitconfig in ${HOME}. So if ${HOME} is
shared between different projects it will affect other projects.
But the script already sets ~/.subversion/servers, so this change just
follows the solution.

It's suggested to use a separated ${HOME} for projects that require
proxy.

Tested: Without this change, qemu-native failed to build during fetching
        the git submodules in places, that it got below error

            error: RPC failed; curl 56 GnuTLS recv error (-54): Error in the
            pull function.

        With this change, it builds fine.

Signed-off-by: Lei YU <yulei.sh@bytedance.com>
Change-Id: Ic12e403d5babd8954748db533ce568fcd7c31f0d