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I am having a problem building the telnet server daemon on my Gentoo
box:

whoami
root
emerge netkit-telnetd
>>> Unpacking source...
>>> Unpacking netkit-telnet-0.17.tar.gz to
/local/var/tmp/portage/net-misc/netkit-telnetd-0.17-r6/work
>>> Unpacking netkit-telnet_0.17-28.diff.gz to
/local/var/tmp/portage/net-misc/netkit-telnetd-0.17-r6/work
* Applying netkit-telnet_0.17-28.diff ... [ ok ]
* Applying netkit-telnetd-0.17-cflags-gnu_source.patch ... [ ok ]
>>> Source unpacked.
>>> Compiling source in
/local/var/tmp/portage/net-misc/netkit-telnetd-0.17-r6/work/netkit-telnet-0.17
....
/usr/portage/net-misc/netkit-telnetd/netkit-telnetd-0.17-r6.ebuild:
../configure:
/bin/sh: bad interpreter: Permission denied
*
* ERROR: net-misc/netkit-telnetd-0.17-r6 failed.
* Call stack:
* ebuild.sh, line 1695: Called dyn_compile
* ebuild.sh, line 1033: Called qa_call
'src_compile'
* ebuild.sh, line 44: Called src_compile
* netkit-telnetd-0.17-r6.ebuild, line 44: Called die
* The specific snippet of code:
* e--./configure --prefix=/usr || die
* The die message:
* (no error message)
*
* If you need support, post the topmost build error, and the call stack
if relevant.
* A complete build log is located at
'/local/var/tmp/portage/net-misc/netkit-telnetd-0.17-r6/temp/build.log'.
*

Hmmm, what the hell is going on. I am concerned about the error:
/bin/sh: bad interpreter: Permission denied

I am root, and the drive is local. Why do I have this error?

whoami
root
ls -l /bin/sh
lrwxrwxrwx 1 root root 4 Nov 1 22:47 /bin/sh -> bash
ls -l /bin/bash
-rwxr-xr-x 1 root root 651148 Nov 1 22:46 /bin/bash
whoami
root
/bin/sh
sh-3.2# whoami
root
sh-3.2# exit
whoami
root

Thanks in advance to anyone who can help.

Mark.

--
Mark Hobley,
393 Quinton Road West,
Quinton, BIRMINGHAM.
B32 1QE.

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On Sunday 20 Jan 2008 21:08 in article
<79oc65-n2b.ln1@neptune.markhobley.yi.org> of alt.os.linux.gentoo, Mark
Hobley(markhobley@hotpop.donottypethisbit.com) wrote:

[snip]
> /bin/sh: bad interpreter: Permission denied

This sometimes arises when your shell is being loaded from a physical
filesystem that has been mounted, implicitly or explicitly,
with "noexec" in its mount options. Since the name is "/bin/sh", this
would indicate a chroot jail on a noexec filesystem.

There could be other reasons too, but since Portage uses chroot, the
above one sticks out in my mind.
- --
Regards

Dave [RLU#314465]
================================================== ====
dwnoon@spamtrap.ntlworld.com (David W Noon)
Remove spam trap to reply via e-mail.
================================================== ====

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David W Noon <dwnoon@spamtrap.ntlworld.com> wrote:

> Since the name is "/bin/sh", this would indicate a chroot jail on a noexec
> filesystem.

You might be on to something there. I don't know portage that well. I am
a new user of Gentoo, but on my system /tmp, /home, and /var are all
symlinks to subdirectories of /local, which is a noexec filesystem.

That is odd though, because I have managed to emerge other packages on
the same system without any problems, although I am in the early stages of
deployment.

I wonder what is different about telnetd that causes it to error, but
other packages like tree and less build ok. Why didn't they use a
chroot?

Where does portage build the chroot and can I change this?

I'm wondering what to do about the chroot now. I don't really want to
remove the noexec, unless I have to, but at the same time, I don't want
to move the chroot to /usr.

I need to somehow maintain access to the local binaries, rather than
have them copying to a chroot jail. I might be able to do some sort of
loop mount for this, but I haven't tested that.

Another alternative may be to loop mount the chrooted /bin directory,
this time permitting exec on the loop mount, but I have not tested this.

Is there some configuration changes that I can make to portage for that?
or can I switch the chroot off, and possibly use fakeroot instead?

(I'll obvious need to be root to install, but I could do this manually.)

Mark.

--
Mark Hobley,
393 Quinton Road West,
Quinton, BIRMINGHAM.
B32 1QE.

Mark Hobley <markhobley@hotpop.donottypethisbit.com> wrote:
> David W Noon <dwnoon@spamtrap.ntlworld.com> wrote:
>
>> Since the name is "/bin/sh", this would indicate a chroot jail on a noexec
>> filesystem.
>
> You might be on to something there. I don't know portage that well. I am
> a new user of Gentoo, but on my system /tmp, /home, and /var are all
> symlinks to subdirectories of /local, which is a noexec filesystem.

It must have been this. I remounted /local with execute permissions, and
the package build completed normally.

Cheers,

Mark.

--
Mark Hobley,
393 Quinton Road West,
Quinton, BIRMINGHAM.
B32 1QE.