Continuous builds on Hydra

[Ludovic Courtès]

BTW, you might have seen that the Hydra build script does this:

    patchPhase =
      # Remove occurrences of /usr/bin/perl and /bin/bash.
      '' for i in                           \
            tests/nist-pkits/build-chain    \
            doc/scripts/sort2.pl            \
            doc/scripts/gdoc                \
            doc/doxygen/Doxyfile.orig       \
            doc/doxygen/Doxyfile.in
         do
           echo "patching \`/usr/bin/perl' in \`$i'..."
           sed -i "$i" -e's|/usr/bin/perl|${pkgs.perl}/bin/perl|g'
         done

         for i in "tests/"*"/"*
         do
           if grep -q /bin/bash "$i"
           then
             echo "patching \`/bin/bash' in \`$i'..."
             sed -i "$i" -e's|/bin/bash|/bin/sh|g'
           fi
         done
      '';

The Right Fix would be:

  - For /usr/bin/perl, use AC_PATH_PROG and substitute @PERL@ in those
    scripts.

  - For /bin/bash, it’s probably enough to use /bin/sh.

Thanks,
Ludo’.