The new environment variable, PASSWORD_STORE_PLATFORM_FILE is now used
for loading custom platform files while pass lives as
src/password-store.sh. After it is installed using 'make install', this
environment variable is no longer used, and either no platform file is
loaded (if the default platform is acceptable), or a hardcoded
also-installed platform file is referenced.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Based-on-work-by: Matthieu Weber <mweber@free.fr>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

According to Brandon Jones, all we need to do is adjust /dev/clipboard
from xclip. So we add a platform specific file to do so.
http://www.relaytheurgency.com/2014/04/pass-in-cygwin-relatively-simple.html



Suggested-by: Brandon Jones <jones.brandon.lee@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

This relies on a patched version of tree to work, unfortunately.
Hopefully upstream will accept our patch.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Matthew writes:

    If the initial decrypt fails then the rest of the line shouldn't
    continue, as it won't be a properly decrypted password being
    re-encrypted and written over the existing passfile.

    One solution to this would be to enable pipefail (set -o pipefail) -
    either just before, or at the start of this script.  This would
    cause the failure of any of the commands in a pipe to set the return
    status of the whole pipeline to non-zero (the last failed command's
    return code is used).

We take his suggestion with this patch. While we're at it, we take a
little bit extra care (though not too much extra care) to select a more
random intermediate password, in case folks have a strange habit of
using a dot-new extension on files.

Suggested-by: Matthew Richardson <m.richardson@ed.ac.uk>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>