[Bug 2561] ssh-keygen -A does not recreate broken zero-sized host keys

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2561

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
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   Attachment #2804|0                           |1
        is obsolete|                            |
   Attachment #2805|                            |ok?(dtucker at zip.com.au)
              Flags|                            |

--- Comment #3 from Damien Miller <djm at mindrot.org> ---
Created attachment 2805
  --> https://bugzilla.mindrot.org/attachment.cgi?id=2805&action=edit
overwrite zero-length key files, move keys into place atomically

Darren correctly points out that the previous diff could clobber valid
keys under some circumstances.

This diff is much less aggressive: it only overwrites zero-length
private keys, and uses rename() to atomically move finished private
keys into position so there should be fewer circumstances under which
it leaves partial keys at valid keys path names.

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