wiki:pmagrath

Version 10 (modified by pmagrath@…, 12 years ago) (diff)

Link to thread jberry recommended to me.

Paul Magrath

  • IRC Nick: pmagrath
  • E-Mail: pmagrath AT macports.org

I'm a student of Computer Science at Trinity College Dublin and one of the Google Summer of Code 2008 participants working on improving MacPorts.

My GSoC mentor is Rainer Müller.

I'm available in #macports on FreeNode as pmagrath.

branches/gsoc08-privileges

Summary

To implement facility to reduce need to execute MacPorts as root.

The Plan

The proposal is to implement a number of improvements to the MacPorts code base in order to reduce the need to execute MacPorts with root privileges.

Reduce need for actions to run as root

MacPorts operations which do not explicitly need root privileges will be re-coded so that they will run with normal user privileges. Examples would include fetching, extracting and building the port.

Pretty much done. fetch, checksum, extract, patch, configure and build should now work fine. Operations are executed in ~/.macports/opt/.

Portfile Format

The portfile format shall be extended with an additional attribute to mark those ports that can not be installed without root privileges, such as those requiring StartupItems.

Privilege Escaltion

I would feel that the best behavior for if MacPorts is requested to perform a privileged operation for a port, if it currently has no privileged access would be for the user to be given the choice of elevating privileges (by evoking sudo), installing in a fakeroot or aborting. The complications are that there is currently no way of knowing whether a port needs privileges, creating a fakeroot mechanism, cleanly elevating and de-elevating privileges.

MacPorts Group

It would be a good idea to create an additional group macports which users are allowed to run any port command. So /opt/local would be owned by the group macports with g+rw. (Gentoo's portage does something like this.)

This will allow users who are members of the new macports group to have full write permissions to /opt and its subfolders, and hence to install ports which only affect that hierarchy to install those ports without requiring root privileges.

I have added a "make group" command to the Makefile and a "--with-shared-directory" switch to the configure script. Running "make group" will create a macports group with the gid of 441. "--with-shared-directory" will let let the group specified by "--with-install-group" have full read write access to the /opt/local hierarchy.

Privilege Dropping

Examine how we could drop root privileges for building. So we still run port using sudo, but for the actual building root privileges are dropped and the configure/build phase runs with the privileges of the current user only (or of some new unprivileged macports user?). Of course this needs investigation how the permissions inside the workpath need to be set to accomplish this.

Most actions are now performed using user privileges, up to and including the destroot stage. For install, the original root privileges are recovered and the install takes place as per usual. To the user, this is seamless and the only difference is that the build files get put in ~/.macports/opt rather than /opt. The user account to use when privileges are dropped can be set in macports.conf post-install or with the --with-macports-user=USER option on the ./configure switch. The default value is the user who installs MacPorts.

Install MacPorts in your home directory easily

Modify some of the configure scripts. Currently, if you want to install a MacPorts tree into your home, you need to configure it like this manually:

./configure \ --prefix=~/macports \ --with-install-user=foo \ --with-install-group=foo \ --with-tclpackage=~/Library/Tcl

It'd be great if this could be done with one switch only. For example:

./configure \ --prefix=~/macports \ --without-root-privileges

This will allow users to install packages into their own ~/.macports/opt instead of /opt when non root users wish to install ports for their own use only.

Done. A switch called "--with-no-root-privileges" has been added. Note that --prefix is a built in Autoconf macro that requires an absolute path. As such an example would be "./configure --prefix=/Users/{your-user-name-here}/.macports --with-no-root-privileges"

Goals

1) Implementation of the improvements outlined above.
2) Ability to easily install common packages without root privileges.
3) (Stretch) Easy use of MacPorts without root user account activation.

Related Resources

http://thread.gmane.org/gmane.os.opendarwin.darwinports/16973/focus=17026

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