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872d8fc5c9
The flockit library and tool exists solely because rsync doesn't have file locking. It's not used like a normal library; you don't link against it, and you don't have to patch your source code to use it. It's inserted between your program and its libraries by use of LD_PRELOAD. For example: $ env LD_PRELOAD=$(nix-build -A pkgs.flockit)/lib/libflockit.so FLOCKIT_FILE_PREFIX=test rsync SRC DEST Besides the library a handy executable is provided which can simplify the above to: $ $(nix-build -A pkgs.flockit)/bin/flockit test rsync SRC DEST Also see the following blog post: https://www.swiftstack.com/blog/2012/08/15/old-school-monkeypatching/
52 lines
1.6 KiB
Nix
52 lines
1.6 KiB
Nix
{ stdenv, fetchFromGitHub }:
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stdenv.mkDerivation rec {
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name = "flockit-${version}";
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version = "2012-08-11";
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src = fetchFromGitHub {
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owner = "smerritt";
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repo = "flockit";
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rev = "5c2b2092f8edcc8e3e2eb6ef66c968675dbfa686";
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sha256 = "0vajck9q2677gpn9a4flkyz7mw69ql1647cjwqh834nrcr2b5164";
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};
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installPhase = ''
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mkdir -p $out/lib $out/bin
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cp ./libflockit.so $out/lib
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(cat <<EOI
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#!/bin/sh
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env LD_PRELOAD="$out/lib/libflockit.so" FLOCKIT_FILE_PREFIX=\$1 \''${@:2}
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EOI
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) > $out/bin/flockit
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chmod +x $out/bin/flockit
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'';
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meta = with stdenv.lib; {
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description = "LD_PRELOAD shim to add file locking to programs that don't do it (I'm looking at you, rsync!)";
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longDescription = ''
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This library and tool exists solely because rsync doesn't have file locking.
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It's not used like a normal library; you don't link against it, and you
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don't have to patch your source code to use it. It's inserted between your
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program and its libraries by use of LD_PRELOAD.
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For example:
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$ env LD_PRELOAD=$(nix-build -A pkgs.flockit)/lib/libflockit.so FLOCKIT_FILE_PREFIX=test rsync SRC DEST
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Besides the library a handy executable is provided which can simplify the above to:
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$ $(nix-build -A pkgs.flockit)/bin/flockit test rsync SRC DEST
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Also see the following blog post:
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https://www.swiftstack.com/blog/2012/08/15/old-school-monkeypatching/
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'';
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homepage = https://github.com/smerritt/flockit;
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license = licenses.asl20;
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platforms = platforms.linux;
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maintainers = [ maintainers.basvandijk ];
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};
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}
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