From d9fb53ddd63e61233a255565430a01df7f443709 Mon Sep 17 00:00:00 2001
From: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>
Date: Mon, 9 Mar 2020 17:18:43 -0400
Subject: [PATCH] texlive: reimplement fixHashes.sh in GNU Awk

The shell script doesn't work very well in non-GNU environments like
darwin. This provides an implementation that uses just a single GNU tool
- gawk, thus reduces number of points of failure.
---
 .../typesetting/tex/texlive/UPGRADING.md      |  5 ++--
 .../typesetting/tex/texlive/fixHashes.awk     | 24 +++++++++++++++++++
 .../typesetting/tex/texlive/fixHashes.sh      | 10 --------
 3 files changed, 26 insertions(+), 13 deletions(-)
 create mode 100755 pkgs/tools/typesetting/tex/texlive/fixHashes.awk
 delete mode 100755 pkgs/tools/typesetting/tex/texlive/fixHashes.sh

diff --git a/pkgs/tools/typesetting/tex/texlive/UPGRADING.md b/pkgs/tools/typesetting/tex/texlive/UPGRADING.md
index 3f37184e5d3..71c42917394 100644
--- a/pkgs/tools/typesetting/tex/texlive/UPGRADING.md
+++ b/pkgs/tools/typesetting/tex/texlive/UPGRADING.md
@@ -58,10 +58,9 @@ mv fixedHashes.nix fixedHashes-old.nix
 # start with empty fixedHashes
 echo '{}' > fixedHashes.nix
 
-nix-build ../../../../.. -Q --no-out-link -A texlive.scheme-full.pkgs | ./fixHashes.sh > ./fixedHashes-new.nix
+nix-build ../../../../.. -Q --no-out-link -A texlive.scheme-full.pkgs | ./fixHashes.awk > ./fixedHashes-new.nix
 
-# The script wrongly includes the nix store path to `biber`, which is a separate nixpkgs package
-grep -v -F '/nix/store/' fixedHashes-new.nix > fixedHashes.nix
+mv fixedHashes-new.nix fixedHashes.nix
 ```
 
 ### Commit changes
diff --git a/pkgs/tools/typesetting/tex/texlive/fixHashes.awk b/pkgs/tools/typesetting/tex/texlive/fixHashes.awk
new file mode 100755
index 00000000000..88ba0bc1528
--- /dev/null
+++ b/pkgs/tools/typesetting/tex/texlive/fixHashes.awk
@@ -0,0 +1,24 @@
+#!/usr/bin/env nix-shell
+#! nix-shell -i "gawk -f" -p gawk
+
+BEGIN {
+  print "{"
+}
+
+/-texlive-/ && !/\.bin/ {
+  if (match($0, /-texlive-([^\/]*)/, m) == 0) {
+    print "No match for \""$0"\"" > "/dev/stderr"
+    exit 1
+  }
+  cmd="nix-hash --type sha1 --base32 "$0
+  if (( cmd | getline hash ) <= 0) {
+    print "Error executing nix-hash" > "/dev/stderr"
+    exit 1
+  }
+  close(cmd)
+  printf("\"%s\"=\"%s\";\n", m[1], hash)
+}
+
+END {
+  print "}"
+}
diff --git a/pkgs/tools/typesetting/tex/texlive/fixHashes.sh b/pkgs/tools/typesetting/tex/texlive/fixHashes.sh
deleted file mode 100755
index 439660682e2..00000000000
--- a/pkgs/tools/typesetting/tex/texlive/fixHashes.sh
+++ /dev/null
@@ -1,10 +0,0 @@
-#!/bin/sh
-
-echo "{"
-grep -v -F '.bin-' | while read path; do
-    hash=`nix-hash --type sha1 --base32 "$path"`
-    echo -n "$path" | sed -E 's/[^-]*-texlive-(.*)/"\1"/'
-    echo "=\"$hash\";"
-done
-echo "}"
-