Improved binary relocation: error checking and reporting (#7314)

Fixes #7237
Fixes #6404
Fixes #6418
Fixes #6369

Identify when binary relocation fails to remove all instances of the
source prefix (and report an error to the user unless they specify
-a to allow the old root to appear). This check occurs at two stages:
during "bincache create" all instances of the root are replaced with
a special placeholder string ("@@@@..."), and a failure occurs if the
root is detected at this point; when the binary package is extracted
there is a second check. This addresses #7237 and #6418.

This is intended to be compatible with previously-created binary
packages.

This also adds:

* Better error messages for "spack install --use-cache" (#6404)
* Faster relocation on Mac OS (using a single call to
  install_name_tool for all files rather than a call for each file)
* Clean up when "buildcache create" fails (addresses #6369)
* Explicit error message when the spack instance extracting the binary
  package uses a different install layout than the spack instance that
  created the binary package (since this is currently not supported)
* Remove the option to create unsigned binary packages with -y

0 files changed, 0 insertions, 0 deletions