linuxhw-edid-fetcher: init at unstable-2023-05-08

pkgs/by-name/li/linuxhw-edid-fetcher/linuxhw-edid-fetch.sh

@@ -0,0 +1,96 @@
+#!/usr/bin/env bash
+set -eEuo pipefail
+test -z "${DEBUG:-}" || set -x
+# based on instructions provided in https://github.com/linuxhw/EDID/blob/98bc7d6e2c0eaad61346a8bf877b562fee16efc3/README.md
+
+usage() {
+    cat <<EOF >&2
+Usage:
+  ${BASH_SOURCE[0]} PG278Q 2014 >edid.bin
+  repo=/path/to/linuxhw/EDID ${BASH_SOURCE[0]} PG278Q 2014 >edid.bin
+
+verify the generated file:
+  edid-decode <edid.bin
+  parse-edid <edid.bin
+
+load the generated file:
+  cat edid.bin >/sys/kernel/debug/dri/0/DP-1/edid_override
+EOF
+}
+
+log() {
+    # shellcheck disable=SC2059
+    printf "${1}\n" "${@:2}" >&2
+}
+
+find_displays() {
+    local script=("BEGIN { IGNORECASE=1 } /${1}/")
+
+    for pattern in "${@:2}"; do
+        script+=('&&' "/${pattern}/")
+    done
+    cat "${repo}"/{Analog,Digital}Display.md | awk "${script[*]}"
+}
+
+to_edid() {
+    if ! test -e "$1"; then
+        log "EDID specification file $1 does not exist,"
+        log "it is most likely an error with https://github.com/linuxhw/EDID"
+        return 1
+    fi
+
+    log "Extracting $1..."
+
+    # https://github.com/linuxhw/EDID/blob/228fea5d89782402dd7f84a459df7f5248573b10/README.md#L42-L42
+    grep -E '^([a-f0-9]{32}|[a-f0-9 ]{47})$' <"$1" | tr -d '[:space:]' | xxd -r -p
+}
+
+extract_link() {
+    awk '{ gsub(/^.+]\(</, ""); gsub(/>).+/, ""); print }'
+}
+
+check_repo() {
+    test -d "$1" && test -f "$1/AnalogDisplay.md" && test -f "$1/DigitalDisplay.md"
+}
+
+main() {
+    if [[ $# == 0 ]]; then
+        usage
+        exit 1
+    fi
+
+    : "${repo:="$PWD"}"
+
+    if ! check_repo "$repo"; then
+        repo="${TMPDIR:-/tmp}/edid"
+        log "Not running inside 'https://github.com/linuxhw/EDID', downloading content to ${repo}"
+        if ! check_repo "$repo"; then
+            curl -L https://github.com/linuxhw/EDID/tarball/HEAD | tar -zx -C "${repo}" --strip-components=1
+        fi
+    fi
+
+    log "Using repository at ${repo}"
+
+    readarray -t lines < <(find_displays "${@}")
+    case "${#lines[@]}" in
+    0)
+        log "No matches, try broader patterns?"
+        exit 1
+        ;;
+    1)
+        log "Matched entries:"
+        log "> %s" "${lines[@]}"
+        log "Found exactly one pattern, continuing..."
+        ;;
+    *)
+        log "Matched entries:"
+        log "> %s" "${lines[@]}"
+        log "More than one match, make patterns more specific until there is only one left"
+        exit 2
+        ;;
+    esac
+
+    to_edid "${repo}/$(extract_link <<<"${lines[0]}")"
+}
+
+main "$@"

pkgs/by-name/li/linuxhw-edid-fetcher/package.nix

@@ -0,0 +1,66 @@
+{ lib
+, coreutils
+, curl
+, fetchFromGitHub
+, gawk
+, gnutar
+, stdenv
+, unixtools
+, writeShellApplication
+, nix-update-script
+, displays ? { }
+}:
+
+# Usage:
+#   let
+#     edids = linuxhw-edid-fetcher.override {
+#       displays.PG278Q_2014 = [ "PG278Q" "2560x1440" "2014" ];
+#     };
+#   in
+#     "${edids}/lib/firmware/edid/PG278Q_2014.bin";
+stdenv.mkDerivation rec {
+  pname = "linuxhw-edid-fetcher";
+  version = "unstable-2023-05-08";
+
+  src = fetchFromGitHub {
+    owner = "linuxhw";
+    repo = "EDID";
+    rev = "98bc7d6e2c0eaad61346a8bf877b562fee16efc3";
+    hash = "sha256-+Vz5GU2gGv4QlKO4A6BlKSETxE5GAcehKZL7SEbglGE=";
+  };
+
+  fetch = lib.getExe (writeShellApplication {
+    name = "linuxhw-edid-fetch";
+    runtimeInputs = [ gawk coreutils unixtools.xxd curl gnutar ];
+    text = ''
+      repo="''${repo:-"${src}"}"
+      ${builtins.readFile ./linuxhw-edid-fetch.sh}
+    '';
+  });
+
+  configurePhase = lib.pipe displays [
+    (lib.mapAttrsToList (name: patterns: ''
+      "$fetch" ${lib.escapeShellArgs patterns} > "${name}.bin"
+    ''))
+    (builtins.concatStringsSep "\n")
+  ];
+
+  installPhase = ''
+    mkdir -p "$out/bin"
+    ln -s "$fetch" "$out/bin/"
+    ${lib.optionalString (displays != { }) ''
+      install -D --mode=444 --target-directory="$out/lib/firmware/edid" *.bin
+    ''}
+  '';
+
+  passthru.updateScript = nix-update-script { extraArgs = [ "--version=branch=master" ]; };
+
+  meta = {
+    description = "Fetcher for EDID binaries from Linux Hardware Project's EDID repository";
+    homepage = "https://github.com/linuxhw/EDID";
+    license = lib.licenses.cc-by-40;
+    maintainers = with lib.maintainers; [ nazarewk ];
+    platforms = lib.platforms.all;
+    mainProgram = "linuxhw-edid-fetch";
+  };
+}