aur-getpkg

#!/bin/bash

## Copyright (c) 2017 Timothy Savannah All Rights Reserved
#       Licensed under terms of Apache 2.0 License

# aur-getpkg
#
#   Download the latest of a package's build files into the current directory.
#   
#   You probably want to run this in /usr/src/arch to go along with the rest of these
#    tools
#
if [ "$1" = "--help" ];
then
    cat -- >&2 <<EOT
Usage: aur-getpkg [pkgname]
  Downloads the latest snapshot of an AUR package into current directory

  You probably want to run this in /usr/src/arch, which is where pacman-utils expects you to
    checkout packages.

EOT
    exit 0;
fi

if [ $# -ne 1 ];
then
    echo "Only a single argument is supported. Loop this program if you need to do multiple packages." >&2
    echo "  Use --help for help." >&2
    exit 1;
fi

if ( echo "$1" | grep -q '/' ) || [ "$1" = ".." -o "$1" = "." ];
then
    echo "Cannot be a directory. Must be a package name." >&2
    exit 1;
fi

PKG_NAME="$1"

if [ -d "${PKG_NAME}" ];
then
    if [ -d "${PKG_NAME}.bak" ];
    then
        echo "${PKG_NAME} exists and ${PKG_NAME}.bak exists."
        x="z"
        while [ $x != "y" -a "$x" != "Y" -a "$x" != "n" -a "$x" != "N" ];
        do
            printf "%s" "Remove old backup? (y/n):"
            read x;
        done

        if [ "$x" = "n" -o "$x" = "N" ];
        then
            printf "%s\n" "Aborting based on user input." >&2
            exit 1;
        fi
        rm -Rf "${PKG_NAME}.bak"
        if [ $? -ne 0 ];
        then
           echo "Failed to remove '${PKG_NAME}.bak'" >&2
           exit 1;
        fi
    fi
    echo "Backing up ${PKG_NAME} to ${PKG_NAME}.bak..."
    mv "${PKG_NAME}" "${PKG_NAME}.bak"
    if [ $? -ne 0 ];
    then
        echo "Unable to move '${PKG_NAME}' to '${PKG_NAME}.bak" >&2
        exit 1;
    fi
fi


die() {
    echo "$@" >&2
    exit 1
}

TMP_NAME="$(mktemp --suffix=.tar.gz)"

URL="https://aur.archlinux.org/cgit/aur.git/snapshot/${PKG_NAME}.tar.gz"

# For some reason curl doesn't seem to work here, but wget does..
#curl -k https://aur.archlinux.org/cgit/aur.git/snapshot/pacman-utils-data.tar.gz
wget "${URL}" -O "${TMP_NAME}" || die "Failed to download '${URL}'"

tar -xzf "${TMP_NAME}" || die "Failed to extract archive"

rm -f "${TMP_NAME}"

echo "Checked out latest ${PKG_NAME} to `pwd`/${PKG_NAME}"