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mkversion derives the version from git history, which a shallow clone lacks (the change count silently comes out as 0) and a tree without .git can't provide at all. If TS_VERSION_LONG is set, InfoFrom now takes the version from it plus TS_VERSION_GIT_HASH (and the EXTRA/DATE variants), runs no git, and derives everything else through the same mkOutput as the git path. The result's Long must reproduce the input exactly or InfoFrom errors. Updates tailscale/corp#44945 Change-Id: I9c1247ea5d1c6c52c823c2205447b5c7ee8e778c Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>