Add AUR helper script, README, conf, and LICENSE

LICENSE

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+MIT License
+
+Copyright (c) 2022 Stephen Seo
+
+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.

README.md

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+# Another AUR Helper (incomplete)
+
+AUR is the Arch User Repository, where anyone can upload a PKGBUILD and
+supplementary sources to allow others to build their own packages for use in the
+Arch Linux distribution.
+
+I made an incomplete AUR Helper in Python, and decided to put it in a public
+repository. It's messy, and it requires a significant amount of set-up, but it
+works for me. It always builds in a CHROOT, and it lets the user check the
+PKGBUILD (by default) prior to building. There is no automatic dependency
+management. That must be done in the config. An example config is provided.
+
+# Setting up the AUR Helper
+
+The AUR Helper requires several things:
+
+  - A CHROOT to build in
+  - A "checking GNUPG" directory that contains the GPG public keys that will be
+    checked when building the PKGBUILD
+  - A "singing GNUPG" directory that contains the GPG private key that will sign
+    the built packages and repository database.
+  - SUDO privileges to be able to use `makechrootpkg`
+
+## Dependencies
+
+The `devtools` package is required.
+
+The `python-packaging` and `python-toml` packages are required for the Python
+script to run.
+
+## Create the CHROOT
+
+Use `/usr/bin/mkarchroot` to create your CHROOT in a directory.
+
+    mkarchroot $HOME/mychroot base base-devel
+
+You must refer to the CHROOT as `$HOME/mychroot` if you used the same name as in
+the previous example.
+
+## Set up the GNUPG dirs
+
+### Checking GNUPG
+
+Just create the directory anywhere, and store it in the `config.toml`. You must
+manually add public keys to it if a package requires checking source files with
+GNUPG.
+
+    GNUPGHOME=$HOME/myCheckingGNUPGDir gpg --recv-keys A_DEV_KEYS_FINGERPRINT
+
+### Signing GNUPG
+
+You will need to set up a GPG public/private key pair. GNUPG always respects the
+`GNUPGHOME` environment variable as the `.gnupg` dir, so set the variable first,
+then set up your keys. The keys will be used to sign the packages you build and
+the custom repository that stores the package metadata.
+
+Set the `signing_gpg_key_fp` variable in the config to the output fingerprint
+from of:
+
+    GNUPGHOME=mySigningGNUPGDir gpg --fingerprint
+
+Note that you must remove the spaces between each part of the fingerprint, like
+in the example config.
+
+Keep note of the password you store for this GNUPG key, as you will enter it
+every time you use the Python script.
+
+## Set up the config dir
+
+See the `example_config.toml` for more configuration. It should be commented
+enough for figuring out how to use it.
+
+# Using the AUR Helper
+
+Typically, you will invoke:
+
+    ./update.py --config my_config.toml
+
+If you want to build in the CHROOT without updating the CHROOT, add the
+`--no-update` flag.
+
+If you want to check only specific packages in the list of packages in the
+config use something like `-p <package-name>`. You can use `-p <package_name>`
+multiple times if you want to check a handful of packages only.
+
+If you want to not skip a package marked with `skip_branch_up_to_date` in the
+config, then use `--no-skip <package-name>`, and the script will act as if
+`skip_branch_up_to_date` was not specified for the named package.
+
+When building, the script will not directly output to the terminal it is run in,
+but rather appends to log files in the log directory specified in the config. To
+see the output while building, you can use something like:
+
+    tail -f $MY_LOG_DIR/google-chrome_stdout_2022-06-02_05-27-49_UTC
+
+It may be helpful to periodically clear out the logs directory in between
+invocations of the AUR Helper script.
+
+It is recommended to use the script with a prepared config.

example_config.toml

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+########## MANDATORY VARIABLES
+custom_cache = "/home/custompkgs"
+chroot = "/home/stephen/Downloads/aur/chroot"
+pkg_dir = "/home/custompkgs"
+repo = "/home/custompkgs/custom.db.tar"
+dirs_dir = "/home/stephen/Downloads/aur"
+gpg_dir = "/home/stephen/Downloads/aur/checkingGPG"
+logs_dir = "/home/stephen/Downloads/aur/logs"
+signing_gpg_dir = "/home/stephen/Downloads/aur/signingGPG"
+signing_gpg_key_fp = "04D9E3A2880F6418EC4BA70EA0F3F8FAA2088E62"
+########## END OF MANDATORY VARIABLES
+
+# Each [[entry]] needs a "name".
+# it is expected that the name matches a repo's name at https://aur.archlinux.org/
+# For example, "aurutils" repo is fetched from https://aur.archlinux.org/aurutils.git
+#
+# It may be handy to specify "skip_branch_up_to_date" for packages that do not
+# build directly from a git repository (packages ending in "-git").
+# Packages with this setting will not prompt to check the PKGBUILD if the
+# .SRCINFO version is not newer than the current latest package in the custom
+# repo, and it will be skipped.
+#
+# For AUR dependencies, an "aur_deps" array needs to be specified.
+# AUR dependencies must appear before the package that depends on them in this
+# list. If building these dependencies for the first time, the dependent package
+# may fail checks until the dependencies are built and stored in the repo.
+#
+# There is support for "ccache" and "sccache".
+# Make a directory somewhere, then specify its path with the "ccache_dir"
+# or "sccache_dir" variables.
+# sccache supports the additional "sccache_cache_size" variable, which can be
+# set to a string such as "5G". If "sccache_cache_size' is not specified, then
+# "5G" is used.
+
+[[entry]]
+name = "arcanist-git"
+
+[[entry]]
+name = "aurutils"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "cef-minimal"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "cpufetch-git"
+
+[[entry]]
+name = "f3"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "flamegraph-git"
+
+[[entry]]
+name = "g810-led-git"
+
+[[entry]]
+name = "glfw-git"
+
+[[entry]]
+name = "gnome-icon-theme-symbolic"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "gnome-icon-theme"
+aur_deps = [
+    "gnome-icon-theme-symbolic"
+]
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "gnvim"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "perl-file-rename"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "icecat"
+aur_deps = [
+    "perl-file-rename"
+]
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "ion-git"
+
+[[entry]]
+name = "ly"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "nouveau-fw"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "ncurses5-compat-libs"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "opencl-amd"
+aur_deps = [
+    "ncurses5-compat-libs"
+]
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "epson-inkjet-printer-escpr"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "epson-inkjet-printer-escpr2"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "google-chrome"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "ifuse"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "libva-vdpau-driver-chromium"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "mate-screensaver-hacks"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "mcrcon"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "minecraft-launcher"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "mingw-w64-environment"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "mingw-w64-glm"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "mingw-w64-lua"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "mingw-w64-pkg-config"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "mingw-w64-cmake"
+aur_deps = [
+    "mingw-w64-pkg-config",
+    "mingw-w64-environment"
+]
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "mingw-w64-configure"
+aur_deps = [
+    "mingw-w64-pkg-config",
+    "mingw-w64-environment"
+]
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "mingw-w64-zlib"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "mingw-w64-libpng"
+aur_deps = [
+    "mingw-w64-pkg-config",
+    "mingw-w64-environment",
+    "mingw-w64-configure",
+    "mingw-w64-zlib"
+]
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "mingw-w64-make"
+aur_deps = [
+    "mingw-w64-environment"
+]
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "mingw-w64-libsodium"
+aur_deps = [
+    "mingw-w64-environment",
+    "mingw-w64-configure",
+    "mingw-w64-pkg-config"
+]
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "mingw-w64-glfw"
+aur_deps = [
+    "mingw-w64-pkg-config",
+    "mingw-w64-environment",
+    "mingw-w64-cmake"
+]
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "mingw-w64-raylib"
+aur_deps = [
+    "mingw-w64-pkg-config",
+    "mingw-w64-environment",
+    "mingw-w64-cmake",
+    "mingw-w64-glfw"
+]
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "mingw-w64-ldd"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "moonscript"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "nginx-mainline-mod-fancyindex"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "non-mixer-lv2-git"
+
+[[entry]]
+name = "obs-studio-git"
+aur_deps = [
+    "cef-minimal"
+]
+
+[[entry]]
+name = "obs-v4l2sink"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "pasystray-git"
+aur_deps = [
+    "gnome-icon-theme"
+]
+
+[[entry]]
+name = "pikaur"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "qjoypad"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "qt5-wayland-bugfixport-git"
+
+[[entry]]
+name = "quaternion"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "samsung-unified-driver"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "stdman"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "sunvox"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "wlroots-git"
+
+[[entry]]
+name = "swaybg-git"
+
+[[entry]]
+name = "sway-git"
+aur_deps = [
+    "wlroots-git",
+    "swaybg-git"
+]
+other_deps = [
+    "mesa"
+]
+
+[[entry]]
+name = "texlive-tikz-uml"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "ttf-clear-sans"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "umlet"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "ungoogled-chromium"
+ccache_dir = "/home/stephen/Downloads/aur/ccache_ungoogled_chromium"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "wev"
+skip_branch_up_to_date = true
+
+[[entry]]
+name = "wlhangul-git"