Revised windows init2 #21
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Although it's not clear that this note is at all necessary - if the user specifies a CLI option, who cares?
Previously, --git-location was treated as a default answer for the Git menu. Fix this and validate either --git-location argument or the git-location opamrc field as referring to a directory which contains Git.
Rather than filtering git out of the package list, instead add it when required.
Make the ~cygbin parameter to the various executable identification functions optional. The parameter is renamed to search_in_first with a slightly revised semantics - if cygcheck.exe is not found in the directory, then PATH is still searched. This has a key benefit early on in opam init, as it allows cygbin to be set for an internal Cygwin installation which has not yet happened, but still permits curl (et al) to be used from PATH (e.g. when running opam init from an MSYS2 shell). Where before ~cygbin implied that cygcheck _must_ be used from the directory, the new parameter effectively prepends an additional directory to PATH.
Previously, MSYS2 required os-distribution to be overridden in global-variables. Now, as with Cygwin, it is inferred in the same way from cygcheck. In this commit, opam init still sets os-distribution, however, if it is manually removed from the root config file, previously `opam var os-distribution` would return `win32` but now returns `msys2`. Additionally, sys_pkg_manager_cmd is handled in the same way for MSYS2 as for Cygwin, allowing MSYS2 to be automatically added in the same way as Cygwin.
Single argument function with a non-base type.
Includes more checks and also returns the kind of installation which was found.
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