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If gitk is not available in the PATH, bisect ends up exiting with the shell's 127 error code, confusing the git wrapper into thinking that bisect is not a git command. We already fallback to git-log if there doesn't seem to be a graphical display available. We should do the same if gitk is not available in our PATH at all. This not only fixes the ugly error message, but is a much more sensible default than failing to show the user anything. Reported by Maxin John. Tested-by: Maxin B. John <maxin@maxinbjohn.info> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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