From: Jeff King <peff@peff.net>
Date: Thu, 11 Apr 2013 05:42:07 GMT
Subject: Re: regression: "96b9e0e3 config: treat user and xdg config permission problems as errors" busted git-daemon
Message-ID: <20130411054207.GE27795@sigill.intra.peff.net>
In-Reply-To: <1365651583.19620.8.camel@marge.simpson.net>

On Thu, Apr 11, 2013 at 05:39:43AM +0200, Mike Galbraith wrote:

> >   ALLOWED_ENV="PATH HOME"
> >   HOME=/
> 
> I can work around it by changing the init script to use su - git -c "bla
> bla" to launch the thing, instead of using --user=git --group=daemon,
> but that's just a bandaid for the busted environment setup those
> switches were supposed to make happen, no?

Yeah, I think the bug here is that git-daemon should be setting $HOME
when it switches privileges with --user. Does this patch fix it for you?

diff --git a/daemon.c b/daemon.c
index 6aeddcb..a4451fd 100644
--- a/daemon.c
+++ b/daemon.c
@@ -1091,6 +1091,7 @@ static void drop_privileges(struct credentials *cred)
 	if (cred && (initgroups(cred->pass->pw_name, cred->gid) ||
 	    setgid (cred->gid) || setuid(cred->pass->pw_uid)))
 		die("cannot drop privileges");
+	setenv("HOME", cred->pass->pw_dir, 1);
 }
 
 static struct credentials *prepare_credentials(const char *user_name,

I guess that would technically break anybody who was trying to do
something clever with HOME (i.e., point it somewhere besides --user's
HOME where they had put some config files). But the obvious clever
thing would be to also set the user's passwd homedir to the same place.

-Peff