Saturday, September 12, 2009

Up, Up, and Away

Let's say you are in a subdirectory, and there's a Makefile in a parent directory. How do you run make? You climb back up to the parent directory and type "make", or use "make -C parent_dir". In either case, you have to know what the parent dir is. Here are a pair of scripts that do that for you.

The findup script's job is to find a file in a parent directory. It prints the directory name if found, else it exits with status 1.

#! /bin/sh
# usage: findup file [file...]
# Finds any of the files in the current directory or any directory above and
# prints the directory name. If no such directory is found (we hit the root
# directory), exit 1. Note: will not find files in the '/' directory.


while [ `pwd` != '/' ] ; do
    for f in $* ; do
        if [ -f $f ] ; then
            echo `pwd`
            exit 0
    # Keep swimming...keep swimming...swimming, swimming, swimming...
    cd ..

# No parent directory
exit 1

The makeup script uses findup.

#! /bin/sh
# usage: makeup [args...]
# Finds the first makefile in the current directory or any directory above and
# then runs make, passing on any args given to this script.
# Relies on the "findup" command, which is found in this directory.

mfdir=`findup makefile Makefile`
if [ -z "$mfdir" ] ; then
    echo no makefile found
    exit 1

# We've found a makefile. Use the -C flag to tell make to run from the
# directory where we found the makefile. We do this so that error messages
# produced during the make process are relative to the current directory. I
# think.
make -C $mfdir $*

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