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An investigation go/git-repo-shallow shows a number of problems when doing a shallow git fetch/clone. This change introduces an environment variable REPO_ALLOW_SHALLOW. When this environment variable is set to 1 during a repo init or repo sync all shallow git fetch commands are replaced with partial fetch commands. Any shallow repository needing update is unshallowed. This behavior continues until a subsequent repo sync command is run with REPO_ALLOW_SHALLOW set to 1. Bug: b/274340522 Change-Id: I1c3188270629359e52449788897d9d4988ebf280 Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/374754 Reviewed-by: Josip Sokcevic <sokcevic@google.com> Tested-by: Jason Chang <jasonnc@google.com>