[MacPorts] #39843: git-core: Make destroot re-runnable without cleaning if it previously failed

[MacPorts]

#39843: git-core: Make destroot re-runnable without cleaning if it previously
failed
-------------------------+-------------------------
 Reporter:  cal@…        |      Owner:  ciserlohn@…
     Type:  enhancement  |     Status:  new
 Priority:  Low          |  Milestone:
Component:  ports        |    Version:  2.1.99
 Keywords:               |       Port:  git-core
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 When git-core's destroot phase fails (due to circumstances not under
 control of the git-core Portfile, e.g. trace mode being enabled), it can
 not be re-run without failing, because of a number of copy operations that
 will fail if their target already exists.

 The attached patch fixes this.

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Ticket URL: <https://trac.macports.org/ticket/39843>
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