nixpkgs/pkgs/servers/mail/system-sendmail/default.nix

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{ stdenv, writeText }:
let script = writeText "script" ''
#!${stdenv.shell}
if command -v sendmail > /dev/null 2>&1 && [ "$(command -v sendmail)" != "{{MYPATH}}" ]; then
exec sendmail "$@"
elif [ -x /run/wrappers/bin/sendmail ]; then
exec /run/wrappers/bin/sendmail "$@"
elif [ -x /run/current-system/sw/bin/sendmail ]; then
exec /run/current-system/sw/bin/sendmail "$@"
else
echo "Unable to find system sendmail." >&2
exit 1
fi
''; in
stdenv.mkDerivation {
name = "system-sendmail-1.0";
src = script;
phases = [ "buildPhase" ];
buildPhase = ''
mkdir -p $out/bin
< $src sed "s#{{MYPATH}}#$out/bin/sendmail#" > $out/bin/sendmail
chmod +x $out/bin/sendmail
'';
meta = with stdenv.lib; {
description = ''
A sendmail wrapper that calls the system sendmail. Do not install as system-wide sendmail!
'';
platforms = platforms.unix;
maintainers = with maintainers; [ ekleog ];
};
}