* Added support for shells without default variable support
* Added support for BusyBox installs that do not have `command` but has `which`
* Style fixes as suggested by reviewer
* Renamed `WHERE_IS` to `EXISTS` as suggested by review
* Removed expansion of `$LE_AUTO_SUDO` to `x` as the `-n` can check empty strings.
* Added `EXISTS` to debian bootstrap as suggested in review
On Debian 7 (and probably relative distro's) `aptitude show virtualenv` exits
with 0, since it is a virtual package. However, it doesn't have any installation
candidates, so filter on this case before trying to install `virtualenv` to
prevent installation-errors while bootstrapping.
NB, to make this clear:
(0)#: apt-cache show virtualenv
N: Can't select versions from package 'virtualenv' as it is purely virtual
N: No packages found
(0)#: echo $?
0
Furthermore, --quiet=0 is necessary, to be able to grep through `apt-cache`'s
output via a pipe. More details on
http://unix.stackexchange.com/questions/201869/why-isnt-apt-cache-policy-output-piped/202041#202041.
Notably, this also installs pip via the recommended `get-pip` route rather than
grabbing a whole new version over Homebrew; this allows the install to work with
OS X's built-in Python or with the python.org Python.
Otherwise, we sometimes end up using the system Python, for which we'd need to use sudo to install virtualenv. Brew complicates this by yelling at you if you do use sudo. So let's simplify things by always using the homebrew python, which is more up to date anyway.
This fixes an "OSError: [Errno 2] No such file or directory" on Fedora 23. Note that openssl-devel was not sufficient to install the openssl commandline tool.
The current manual-testing build of le-auto now crashes with #1548, but that should have been resolved when we upgraded the cryptography lib and so should go away when we build a new version.
Originally, I had it in mind to move letsencrypt-auto inside this dir. However, now we'd like to copy it or link it to the root level, where people are used to finding it (at least for awhile). Since it would be confusing to have a letsencrypt-auto and a letsencrypt_auto right next to each other, we rename this folder.
