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http://bugs.sourcemage.org/show_bug.cgi?id=15234

           Summary: BUILD_DIRECTORY inconsistent; PATCH
           Product: Sorcery
           Version: 1.14.x
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Unknown
        AssignedTo: sm-sorcery-bugs AT lists.ibiblio.org
        ReportedBy: eekee57 AT fastmail.fm


Any spell which relies on $SOURCE_DIRECTORY in INSTALL has a problem if
$INSTALL_ROOT is set. 

Reason for problem: $SOURCE_DIRECTORY is set in DETAILS as a subdirectory of
$BUILD_DIRECTORY. $BUILD_DIRECTORY is set in /etc/sorcery/config as a subdir 
of
$INSTALL_ROOT. Before INSTALL is run /etc/sorcery/config and DETAILS are
sourced with empty $INSTALL_ROOT. This is correct for many variables but not
for $BUILD_DIRECTORY which must remain consistent.

As an example of what can go wrong, zlib INSTALL has as it's first line:

cd $SOURCE_DIRECTORY.static &&

Now, I cast it with INSTALL_ROOT=/trees/baksys and I find zlib compiled where
I'd expect, /trees/baksys/usr/src/zlib-1.2.3.static exists. In INSTALL
$INSTALL_ROOT is unset and $BUILD_DIRECTORY and $SOURCE_DIRECTORY all re-set,
so cd $SOURCE_DIRECTORY.static cannot work. The actual error from cast:

Preparing to install zlib
castfs: checking sanity of <mnt-dir> and <stage-dir>
castfs: stagedir is okay!
/home/ethan/smgl/stable/archive-libs/zlib/INSTALL: line 1: cd:
/usr/src/zlib-1.2.3.static: No such file or directory
INSTALL failed!
 ! Problem Detected ! 


While it might be nice to automatically set $BUILD_DIRECTORY differently for
each $INSTALL_ROOT target, the requirement for consistancy and the
unavailability of $INSTALL_ROOT at certain times make this very difficult. 
It's
far easier to set $BUILD_DIRECTORY without reference to $INSTALL_ROOT. The
attached patch does this & also adds a warning comment.

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