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function unpack in 'raw' format

= NAME =
unpack - unpack the test program source

= SYNOPSIS =
unpack [nostrip]

= DESCRIPTION =
The unpack function is used during the build phase, to extract the source
into the build directory.  Before the function is called, Fuego changes
to the build directory.  Hence, unpack operates in the current directory.

Source may be specified either with a tarball name
or using 'gitrepo' and 'gitref' in the fuego_test.sh file.

The following extensions are supported:
 * gz, tgz - compressed with gzip
 * bz2 - compressed with bzip2
 * tar - uncompressed

This is normally called by the function ''pre_build'', but can be used
directly by the base test script.  (Although there are no examples of this that
I'm aware of.)

= EXAMPLES =

= ENVIRONMENT and ARGUMENTS =
Environment variables used:
 * $TESTDIR - has the directory name (not full path) for the test
   * this is the same as the full name of the test (eg 'Benchmark.cyclictest')
 * ${TESTNAME}_TARBALL - has the filename of the test program source
   * this comes from the definition of 'tarball' in the base test script
 * ${TESTNAME}_GITREPO - has the online git repository for the test program source
   * this comes from 'gitrepo' in the base test script
 * ${TESTNAME}_GITREF - has a commmit id, tag, or branch reference for the source
   * this comes from 'gitref' in the base test script
 * $TEST_HOME - path to the tests home directory in the Fuego system

Arguments:
 * $1 is optional and may have the word "nostrip" to indicate that leading path components won't be stripped

= RETURN =
Returns result of the 'tar' command, or the 'git checkout' command for the
source.

= SOURCE =
Located in ''scripts/functions.sh''

= SEE ALSO =
 * [[function_pre_build|pre_build]]




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