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#!/bin/sh
set -e
# extracts a tarball's contents to the output directory.
# if the tarball contains just one directory, extract those contents
#
# we can rewrite this script in c eventually, if we want
if [ -z "$1" -o -z "$2" ]; then
echo "Usage: $0 <tarball> <output_directory>" >&2
exit 1
fi
tarball="$1"
target="$2"
is_one_directory() {
if [ $(echo $1 | wc -l) -ne 1 ]; then
return 1
fi
case "$1" in
*/) return 0 ;;
*) return 1 ;;
esac
}
# get top level paths in tarball
tlps=$(tar -tf "$tarball" | grep -E '^(./)?[^/]+/?$')
if is_one_directory "$tlps"; then
# if only one top level directory, extract it and rename it
tar xf "$tarball"
mv "$tlps" "$target"
else
# if a bunch of files or directories, extract them in a directory
mkdir $target
tar xf "$tarball" -C "$target"
fi
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