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-rw-r--r--.gitignore1
-rw-r--r--doc.am3
-rw-r--r--doc/guix.texi27
-rw-r--r--doc/images/dmd-graph.dot75
-rw-r--r--guix/scripts/system.scm34
5 files changed, 133 insertions, 7 deletions
diff --git a/.gitignore b/.gitignore
index e3f2ac2c21..6e8bfaca95 100644
--- a/.gitignore
+++ b/.gitignore
@@ -132,3 +132,4 @@ GTAGS
/doc/images/service-graph.png
/doc/images/service-graph.eps
/doc/images/service-graph.pdf
+/doc/images/dmd-graph.png
diff --git a/doc.am b/doc.am
index 71a65ba0c4..1980cc870e 100644
--- a/doc.am
+++ b/doc.am
@@ -23,7 +23,8 @@ DOT_FILES = \
doc/images/bootstrap-graph.dot \
doc/images/coreutils-graph.dot \
doc/images/coreutils-bag-graph.dot \
- doc/images/service-graph.dot
+ doc/images/service-graph.dot \
+ doc/images/dmd-graph.dot
DOT_VECTOR_GRAPHICS = \
$(DOT_FILES:%.dot=%.eps) \
diff --git a/doc/guix.texi b/doc/guix.texi
index 0e0e507714..fd0adfd203 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -7004,6 +7004,12 @@ $ guix system extension-graph @var{file} | dot -Tpdf > services.pdf
produces a PDF file showing the extension relations among services.
+@anchor{system-dmd-graph}
+@item dmd-graph
+Emit in Dot/Graphviz format to standard output the @dfn{dependency
+graph} of dmd services of the operating system defined in @var{file}.
+@xref{dmd Services}, for more information and for an example graph.
+
@end table
@@ -7332,10 +7338,23 @@ setuid-root programs on the system (@pxref{Setuid Programs}).
The @code{(gnu services dmd)} provides a way to define services managed
by GNU@tie{}dmd, which is GuixSD initialization system---the first
process that is started when the system boots, aka. PID@tie{}1
-(@pxref{Introduction,,, dmd, GNU dmd Manual}). The
-@var{%dmd-root-service} represents PID@tie{}1, of type
-@var{dmd-root-service-type}; it can be extended by passing it lists of
-@code{<dmd-service>} objects.
+(@pxref{Introduction,,, dmd, GNU dmd Manual}).
+
+Services in dmd can depend on each other. For instance, the SSH daemon
+may need to be started after the syslog daemon has been started, which
+in turn can only happen once all the file systems have been mounted.
+The simple operating system defined earlier (@pxref{Using the
+Configuration System}) results in a service graph like this:
+
+@image{images/dmd-graph,,5in,Typical dmd service graph.}
+
+You can actually generate such a graph for any operating system
+definition using the @command{guix system dmd-graph} command
+(@pxref{system-dmd-graph, @command{guix system dmd-graph}}).
+
+The @var{%dmd-root-service} is a service object representing PID@tie{}1,
+of type @var{dmd-root-service-type}; it can be extended by passing it
+lists of @code{<dmd-service>} objects.
@deftp {Data Type} dmd-service
The data type representing a service managed by dmd.
diff --git a/doc/images/dmd-graph.dot b/doc/images/dmd-graph.dot
new file mode 100644
index 0000000000..220a2afca1
--- /dev/null
+++ b/doc/images/dmd-graph.dot
@@ -0,0 +1,75 @@
+digraph "Guix dmd-service" {
+ "user-file-systems" [label = "user-file-systems", shape = box, fontname = Helvetica];
+ "user-processes" -> "user-file-systems" [color = red];
+ "user-processes" [label = "user-processes", shape = box, fontname = Helvetica];
+ "nscd" -> "user-processes" [color = red];
+ "guix-daemon" -> "user-processes" [color = red];
+ "syslogd" -> "user-processes" [color = red];
+ "term-tty6" -> "user-processes" [color = red];
+ "term-tty5" -> "user-processes" [color = red];
+ "term-tty4" -> "user-processes" [color = red];
+ "term-tty3" -> "user-processes" [color = red];
+ "term-tty2" -> "user-processes" [color = red];
+ "term-tty1" -> "user-processes" [color = red];
+ "networking" -> "user-processes" [color = red];
+ "nscd" [label = "nscd", shape = box, fontname = Helvetica];
+ "guix-daemon" [label = "guix-daemon", shape = box, fontname = Helvetica];
+ "syslogd" [label = "syslogd", shape = box, fontname = Helvetica];
+ "ssh-daemon" -> "syslogd" [color = red];
+ "ssh-daemon" [label = "ssh-daemon", shape = box, fontname = Helvetica];
+ "term-tty6" [label = "term-tty6", shape = box, fontname = Helvetica];
+ "console-font-tty6" -> "term-tty6" [color = red];
+ "console-font-tty6" [label = "console-font-tty6", shape = box, fontname = Helvetica];
+ "term-tty5" [label = "term-tty5", shape = box, fontname = Helvetica];
+ "console-font-tty5" -> "term-tty5" [color = red];
+ "console-font-tty5" [label = "console-font-tty5", shape = box, fontname = Helvetica];
+ "term-tty4" [label = "term-tty4", shape = box, fontname = Helvetica];
+ "console-font-tty4" -> "term-tty4" [color = red];
+ "console-font-tty4" [label = "console-font-tty4", shape = box, fontname = Helvetica];
+ "term-tty3" [label = "term-tty3", shape = box, fontname = Helvetica];
+ "console-font-tty3" -> "term-tty3" [color = red];
+ "console-font-tty3" [label = "console-font-tty3", shape = box, fontname = Helvetica];
+ "term-tty2" [label = "term-tty2", shape = box, fontname = Helvetica];
+ "console-font-tty2" -> "term-tty2" [color = red];
+ "console-font-tty2" [label = "console-font-tty2", shape = box, fontname = Helvetica];
+ "term-tty1" [label = "term-tty1", shape = box, fontname = Helvetica];
+ "console-font-tty1" -> "term-tty1" [color = red];
+ "console-font-tty1" [label = "console-font-tty1", shape = box, fontname = Helvetica];
+ "networking" [label = "networking", shape = box, fontname = Helvetica];
+ "ssh-daemon" -> "networking" [color = red];
+ "root-file-system" [label = "root-file-system", shape = box, fontname = Helvetica];
+ "file-system-/run/user" -> "root-file-system" [color = red];
+ "file-system-/run/systemd" -> "root-file-system" [color = red];
+ "file-system-/gnu/store" -> "root-file-system" [color = red];
+ "file-system-/dev/shm" -> "root-file-system" [color = red];
+ "file-system-/dev/pts" -> "root-file-system" [color = red];
+ "user-processes" -> "root-file-system" [color = red];
+ "udev" -> "root-file-system" [color = red];
+ "file-system-/run/user" [label = "file-system-/run/user", shape = box, fontname = Helvetica];
+ "user-processes" -> "file-system-/run/user" [color = red];
+ "file-system-/run/systemd" [label = "file-system-/run/systemd", shape = box, fontname = Helvetica];
+ "user-processes" -> "file-system-/run/systemd" [color = red];
+ "file-system-/gnu/store" [label = "file-system-/gnu/store", shape = box, fontname = Helvetica];
+ "user-processes" -> "file-system-/gnu/store" [color = red];
+ "file-system-/dev/shm" [label = "file-system-/dev/shm", shape = box, fontname = Helvetica];
+ "user-processes" -> "file-system-/dev/shm" [color = red];
+ "file-system-/dev/pts" [label = "file-system-/dev/pts", shape = box, fontname = Helvetica];
+ "user-processes" -> "file-system-/dev/pts" [color = red];
+ "udev" [label = "udev", shape = box, fontname = Helvetica];
+ "term-tty6" -> "udev" [color = red];
+ "term-tty5" -> "udev" [color = red];
+ "term-tty4" -> "udev" [color = red];
+ "term-tty3" -> "udev" [color = red];
+ "term-tty2" -> "udev" [color = red];
+ "term-tty1" -> "udev" [color = red];
+ "networking" -> "udev" [color = red];
+ "host-name" [label = "host-name", shape = box, fontname = Helvetica];
+ "term-tty6" -> "host-name" [color = red];
+ "term-tty5" -> "host-name" [color = red];
+ "term-tty4" -> "host-name" [color = red];
+ "term-tty3" -> "host-name" [color = red];
+ "term-tty2" -> "host-name" [color = red];
+ "term-tty1" -> "host-name" [color = red];
+ "loopback" [label = "loopback", shape = box, fontname = Helvetica];
+
+}
diff --git a/guix/scripts/system.scm b/guix/scripts/system.scm
index 9160969b95..b5da57a9ce 100644
--- a/guix/scripts/system.scm
+++ b/guix/scripts/system.scm
@@ -36,6 +36,7 @@
#:use-module (gnu system vm)
#:use-module (gnu system grub)
#:use-module (gnu services)
+ #:use-module (gnu services dmd)
#:use-module (gnu packages grub)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-19)
@@ -282,7 +283,7 @@ it atomically, and then run OS's activation script."
;;;
-;;; Graph.
+;;; Graphs.
;;;
(define (service-node-label service)
@@ -311,6 +312,18 @@ list of services."
(label service-node-label)
(edges (lift1 (service-back-edges services) %store-monad))))
+(define (dmd-service-node-label service)
+ "Return a label for a node representing a <dmd-service>."
+ (string-join (map symbol->string (dmd-service-provision service))))
+
+(define (dmd-service-node-type services)
+ "Return a node type for SERVICES, a list of <dmd-service>."
+ (node-type
+ (name "dmd-service")
+ (description "the dependency graph of dmd services")
+ (identifier (lift1 dmd-service-node-label %store-monad))
+ (label dmd-service-node-label)
+ (edges (lift1 (dmd-service-back-edges services) %store-monad))))
;;;
@@ -410,6 +423,19 @@ building anything."
#:node-type (service-node-type services)
#:reverse-edges? #t)))
+(define (export-dmd-graph os port)
+ "Export the graph of dmd services of OS to PORT."
+ (let* ((services (operating-system-services os))
+ (pid1 (fold-services services
+ #:target-type dmd-root-service-type))
+ (dmds (service-parameters pid1)) ;the list of <dmd-service>
+ (sinks (filter (lambda (service)
+ (null? (dmd-service-requirement service)))
+ dmds)))
+ (export-graph sinks (current-output-port)
+ #:node-type (dmd-service-node-type dmds)
+ #:reverse-edges? #t)))
+
;;;
;;; Options.
@@ -435,6 +461,8 @@ Build the operating system declared in FILE according to ACTION.\n"))
init initialize a root file system to run GNU\n"))
(display (_ "\
extension-graph emit the service extension graph in Dot format\n"))
+ (display (_ "\
+ dmd-graph emit the graph of dmd services in Dot format\n"))
(show-build-options-help)
(display (_ "
@@ -543,7 +571,7 @@ Build the operating system declared in FILE according to ACTION.\n"))
(let ((action (string->symbol arg)))
(case action
((build vm vm-image disk-image reconfigure init
- extension-graph)
+ extension-graph dmd-graph)
(alist-cons 'action action result))
(else (leave (_ "~a: unknown action~%") action))))))
@@ -611,6 +639,8 @@ Build the operating system declared in FILE according to ACTION.\n"))
(case action
((extension-graph)
(export-extension-graph os (current-output-port)))
+ ((dmd-graph)
+ (export-dmd-graph os (current-output-port)))
(else
(perform-action action os
#:dry-run? dry?