[darcs-users] darcs patch: Check for bash before running shell tests. (and 3 more)

[E.Y.Kow at brighton.ac.uk]

Note: I tried to send the first three patches from the Windows box, but then
Internet Explorer asked me for my Microsoft Passport login, and then gave me a
login error page (although not a fancy one, just some ugly error codes).  Darcs
then told me it sent the patches succesfully.  I guess I should file a bug
report.

Also, the fourth (GPL) patch is just me consolidating the previous patches I
had sent, and the newer grants.

Thu Jun 12 15:55:09 BST 2008  Eric Kow <E.Y.Kow at brighton.ac.uk>
  * Check for bash before running shell tests.
  MSYS, for instance, does not provide bash by default.
  [note: or rather, only under the guise of sh.exe]

Fri Jun 13 08:02:13 BST 2008  Eric Kow <E.Y.Kow at brighton.ac.uk>
  * Fix a backup bug on case-insensitive file systems.
  
  Avoids this scenario.  The task: move foo to FOO and modify FOO
  1. FOO (foo) already exists, so I'll back it up
     (moves FOO [foo] to FOO.darcs-backup0)
  2. Now I can move foo to FOO
     foo no longer exists, but that's ok
     (nothing happens)
  3. Now I can FOO
     hey, where did FOO go?
     (crash!)

Fri Jun 13 08:09:18 BST 2008  Eric Kow <E.Y.Kow at brighton.ac.uk>
  * Add test for case-insensitive backup bug.

Fri Jun 13 08:27:49 BST 2008  Eric Kow <E.Y.Kow at brighton.ac.uk>
  * Exceptions to GPL granted as of 2008-06-13 morning.

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