[PATCH v2 1/2] Allow deriving the current user's home directory via the HOME variable
Tue Oct 18 17:02:50 GMT 2022
On Sep 21 13:58, Johannes Schindelin wrote:
> Hi Corinna,
> sorry for the blast from the past, but I am renewing my efforts to
> upstream Git for Windows' patches that can be upstreamed.
> On Thu, 17 Dec 2015, Corinna Vinschen wrote:
Well, not even 7 years, so what? :)
> > On Dec 17 19:05, Johannes Schindelin wrote:
> > > + DWORD max = sizeof wbuf / sizeof *wbuf;
> > > + DWORD len = GetEnvironmentVariableW (key, wbuf, max);
> > This call to GetEnvironmentVariableW looks gratuitous to me. Why don't
> > you simply call getenv? It did the entire job already, it avoids the
> > requirement for a local buffer, and in case of $HOME it even did the
> > Win32->POSIX path conversion. If there's a really good reason for using
> > GetEnvironmentVariableW it begs at least for a longish comment.
> My only worry is that `getenv("HOME")` might receive a "Cygwin-ified"
> version of the value. That is, `getenv("HOME")` might return something
> like `/cygdrive/c/Users/corinna` when we expect it to return
> `C:\Users\corinna` instead.
Haha, yeah, that's exactly what it does. Look at environ.cc, search for
conv_envvars. There's a list of env vars which are converted
automatically. So getenv ("HOME") already does what you need, you just
have to adapt the code accordingly, i. e.
if ((home = getenv ("HOME")))
return strdup (home);
if (((home_drive = getenv ("HOMEDRIVE")
return (char *) cygwin_create_path (CCP_WIN_A_TO_POSIX, home);
However, on second thought, I wonder if the HOMEDRIVE/HOMEPATH/USERPROFILE
code is really required. AFAICS, it's just a duplication of the effort
already done in fetch_windows_home(), isn't it?
HOMEDRIVE/HOMEPATH are generated from the DB data returned in
USER_INFO_3 or via ldap anyway, and fetch_windows_home() also falls back
to fetching the user profile path, albeit from the registry.
That means, the results from the "env" method is equivalent to the
"windows" method, just after checking $HOME. That's a bit of a downer.
Assuming the "env" method would *only* check for $HOME, the user would
have the same result by simply setting nsswitch.conf accordingly:
home: env windows
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