daemontools: add manpages from Debian

Using software, whose documentation is only available online is not
always convenient. This package has only online docuemntation and
upstream provides no manpages.

This commit extends the package by manpages prepared by Debian
developers. The manpages are added to a separate output. Listing of
the outputs of this package now looks like this:

    result
    └── bin
        ├── envdir
        ├── envuidgid
        ├── fghack
        ├── multilog
        ├── pgrphack
        ├── readproctitle
        ├── setlock
        ├── setuidgid
        ├── softlimit
        ├── supervise
        ├── svc
        ├── svok
        ├── svscan
        ├── svscanboot
        ├── svstat
        ├── tai64n
        └── tai64nlocal
    result-man
    └── share
        ├── doc
        │   └── daemontools
        │       └── README.man
        └── man
            └── man8
                ├── envdir.8.gz
                ├── envuidgid.8.gz
                ├── fghack.8.gz
                ├── multilog.8.gz
                ├── pgrphack.8.gz
                ├── readproctitle.8.gz
                ├── setlock.8.gz
                ├── setuidgid.8.gz
                ├── softlimit.8.gz
                ├── supervise.8.gz
                ├── svc.8.gz
                ├── svok.8.gz
                ├── svscan.8.gz
                ├── svscanboot.8.gz
                ├── svstat.8.gz
                ├── tai64n.8.gz
                └── tai64nlocal.8.gz

1 files changed, 18 insertions, 1 deletions

diff --git a/pkgs/tools/admin/daemontools/default.nix b/pkgs/tools/admin/daemontools/default.nix
index ad12234bf27b5..f827b1c71a0e9 100644
--- a/pkgs/tools/admin/daemontools/default.nix
+++ b/pkgs/tools/admin/daemontools/default.nix
@@ -1,5 +1,11 @@
-{ fetchurl, bash, glibc, lib, stdenv }:
+{ fetchurl, bash, glibc, lib, stdenv, installShellFiles }:
 
+let
+  man-pages = fetchurl {
+    url = "https://salsa.debian.org/debian/daemontools/-/archive/debian/1%250.76-8/daemontools-debian-1%250.76-8.tar.gz?path=debian/daemontools-man";
+    sha256 = "sha256-om5r1ddUx1uObp9LR+SwCLLtm+rRuLoq28OLbhWhdzU=";
+  };
+in
 stdenv.mkDerivation rec {
   pname = "daemontools";
   version = "0.76";
@@ -11,6 +17,10 @@ stdenv.mkDerivation rec {
 
   patches = [ ./fix-nix-usernamespace-build.patch ];
 
+  outputs = [ "out" "man" ];
+
+  nativeBuildInputs = [ installShellFiles ];
+
   configurePhase = ''
     cd daemontools-${version}
 
@@ -32,8 +42,15 @@ stdenv.mkDerivation rec {
     for cmd in $(cat package/commands); do
       install -Dm755 "command/$cmd" "$out/bin/$cmd"
     done
+
+    tar -xz --strip-components=2 -f ${man-pages}
+    installManPage daemontools-man/*.8
+    install -v -Dm644 daemontools-man/README $man/share/doc/daemontools/README.man
   '';
 
+  # Keep README.man in the man output (see _multioutDocs())
+  outputDoc = "man";
+
   meta = {
     license = lib.licenses.publicDomain;
     homepage = "https://cr.yp.to/daemontools.html";