scancode

#!/bin/bash
#
# Copyright (c) 2017 nexB Inc. http://www.nexb.com/ - All rights reserved.
#

# A minimal shell wrapper to the CLI entry point fo ScanCode


###################################################################################
# from https://raw.githubusercontent.com/mkropat/sh-realpath/58c03982cfd8accbcf0c4426a4adf0f120a8b2bb/realpath.sh
# realpath emulation for portability on *nix
# this allow running scancode from aribtrary locations and from symlinks
#
# Copyright (c) 2014 Michael Kropat
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

realpath() {
    canonicalize_path "$(resolve_symlinks "$1")"
}

resolve_symlinks() {
    _resolve_symlinks "$1"
}

_resolve_symlinks() {
    _assert_no_path_cycles "$@" || return

    local dir_context path
    path=$(readlink -- "$1")
    if [ $? -eq 0 ]; then
        dir_context=$(dirname -- "$1")
        _resolve_symlinks "$(_prepend_dir_context_if_necessary "$dir_context" "$path")" "$@"
    else
        printf '%s\n' "$1"
    fi
}

_prepend_dir_context_if_necessary() {
    if [ "$1" = . ]; then
        printf '%s\n' "$2"
    else
        _prepend_path_if_relative "$1" "$2"
    fi
}

_prepend_path_if_relative() {
    case "$2" in
        /* ) printf '%s\n' "$2" ;;
         * ) printf '%s\n' "$1/$2" ;;
    esac
}

_assert_no_path_cycles() {
    local target path

    target=$1
    shift

    for path in "$@"; do
        if [ "$path" = "$target" ]; then
            return 1
        fi
    done
}

canonicalize_path() {
    if [ -d "$1" ]; then
        _canonicalize_dir_path "$1"
    else
        _canonicalize_file_path "$1"
    fi
}

_canonicalize_dir_path() {
    (cd "$1" 2>/dev/null && pwd -P)
}

_canonicalize_file_path() {
    local dir file
    dir=$(dirname -- "$1")
    file=$(basename -- "$1")
    (cd "$dir" 2>/dev/null && printf '%s/%s\n' "$(pwd -P)" "$file")
}

###################################################################################
# Now run scancode proper

SCANCODE_BIN="$( realpath "${BASH_SOURCE[0]}" )"
SCANCODE_ROOT_DIR="$( cd "$( dirname "${SCANCODE_BIN}" )" && pwd )"

SCANCODE_CONFIG_DIR="etc/conf"

GIT_STATUS=$(git -C "$SCANCODE_ROOT_DIR" status --porcelain 2> /dev/null)
if [ $? -eq 0 ]; then
    # This is a Git working tree, check whether it is clean.
    if [ -z "$GIT_STATUS" ]; then
        # This is a clean working tree, check whether configure has been run
        # before for this commit.
        GIT_COMMIT_CONFIGURED=$(cat "$SCANCODE_ROOT_DIR/SCANCODE_GIT_MODE" 2> /dev/null)
        GIT_COMMIT_HEAD=$(git -C "$SCANCODE_ROOT_DIR" rev-parse HEAD)
        if [ "$GIT_COMMIT_CONFIGURED" != "$GIT_COMMIT_HEAD" ]; then
            echo "* (Re-)Configuring ScanCode because Git commits have changed..."
            CONFIGURE_QUIET=1 $SCANCODE_ROOT_DIR/configure $SCANCODE_CONFIG_DIR
        fi
        echo $GIT_COMMIT_HEAD > "$SCANCODE_ROOT_DIR/SCANCODE_GIT_MODE"
    else
        echo "* (Re-)Configuring ScanCode because Git working tree is not clean..."
        CONFIGURE_QUIET=1 $SCANCODE_ROOT_DIR/configure $SCANCODE_CONFIG_DIR
    fi
else
    rm -f "$SCANCODE_ROOT_DIR/SCANCODE_GIT_MODE"
fi

SCANCODE_CONFIGURED_PYTHON=$SCANCODE_ROOT_DIR/bin/python
if [ ! -f "$SCANCODE_CONFIGURED_PYTHON" ]; then
    echo "* Configuring ScanCode for first use..."
    CONFIGURE_QUIET=1 $SCANCODE_ROOT_DIR/configure $SCANCODE_CONFIG_DIR
fi

$SCANCODE_ROOT_DIR/bin/scancode "$@"