Changes between Version 18 and Version 19 of SummerOfCode


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Timestamp:
Mar 13, 2007, 12:19:27 AM (17 years ago)
Author:
pguyot (Paul Guyot)
Comment:

More details about task 3.

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  • SummerOfCode

    v18 v19  
    4444==== Task 3: Virtual "chroot" ====
    4545
    46 Building from the trace mode mechanism, create real "virtual chroot" environments for building ports, constraining what their configure scripts can see and validating that their explicit dependencies are correct and fully-formed.
     46MacPorts uses dynamic library injection code to control and monitor file system accesses of ports when they are compiled. This technique is used for the trace mode which is used to automatically figure out dependencies between ports. The proposed task consists in upgrading this mechanism to transform the trace mode (which ''reports'') into a virtual chroot environment which will contraint ports to be compiled in a controlled environment. For example, if a port does not mention a dependency on the jpeg port, the configure script, the compiler and the linker will not see jpeg port binaries, includes and libraries. This task could extend up to defining virtual ports based on software installed with traditional MacOS X packages (for which list of files are saved in /Library/Receipts/). Part of the challenge includes the design of an efficient communication channel between the dynamic library and the Tcl code and a complete study of possible holes in this virtual chroot environment.
    4747
    48 Classification: major task[[BR]]
     48Classification: challenging task[[BR]]
     49Programming languages: Tcl and C[[BR]]
    4950Potential mentor: pguyot
    5051