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| author | Ludovic Courtès <ludo@gnu.org> | 2016-11-23 11:04:28 +0100 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2016-11-23 21:13:18 +0100 |
| commit | f25c9ebc805565ae517c87c6b904bde0661bee46 (patch) | |
| tree | 0edc2d782aa6818d4e0f67d89724fe5db6bf073f | |
| parent | 1c9f78eca1f7e169562abaaa882fd94d845208af (diff) | |
| download | guix-f25c9ebc805565ae517c87c6b904bde0661bee46.tar.gz guix-f25c9ebc805565ae517c87c6b904bde0661bee46.zip | |
marionette: Delay synchronization with the host's REPL.
* gnu/build/marionette.scm (<marionette>)[marionette-repl]: Rename to...
[%marionette-repl]: ... this.
(marionette-repl): New macro.
(make-marionette): Wrap last 'read' call into 'delay', making the last
argument to 'marionette' a promise of a port.
(marionette-eval): Use 'force' in 'match' clause.
| -rw-r--r-- | gnu/build/marionette.scm | 35 |
1 files changed, 23 insertions, 12 deletions
diff --git a/gnu/build/marionette.scm b/gnu/build/marionette.scm index d36e1c8d09..70b737fc57 100644 --- a/gnu/build/marionette.scm +++ b/gnu/build/marionette.scm @@ -45,7 +45,10 @@ (command marionette-command) ;list of strings (pid marionette-pid) ;integer (monitor marionette-monitor) ;port - (repl marionette-repl)) ;port + (repl %marionette-repl)) ;promise of a port + +(define-syntax-rule (marionette-repl marionette) + (force (%marionette-repl marionette))) (define* (wait-for-monitor-prompt port #:key (quiet? #t)) "Read from PORT until we have seen all of QEMU's monitor prompt. When @@ -131,21 +134,29 @@ QEMU monitor and to the guest's backdoor REPL." (close-port monitor) (wait-for-monitor-prompt monitor-conn) (display "read QEMU monitor prompt\n") - (match (accept* repl) - ((repl-conn . addr) - (display "connected to guest REPL\n") - (close-port repl) - (match (read repl-conn) - ('ready - (alarm 0) - (display "marionette is ready\n") - (marionette (append command extra-options) pid - monitor-conn repl-conn))))))))))) + + (marionette (append command extra-options) pid + monitor-conn + + ;; The following 'accept' call connects immediately, but + ;; we don't know whether the guest has connected until + ;; we actually receive the 'ready' message. + (match (accept* repl) + ((repl-conn . addr) + (display "connected to guest REPL\n") + (close-port repl) + ;; Delay reception of the 'ready' message so that the + ;; caller can already send monitor commands. + (delay + (match (read repl-conn) + ('ready + (display "marionette is ready\n") + repl-conn)))))))))))) (define (marionette-eval exp marionette) "Evaluate EXP in MARIONETTE's backdoor REPL. Return the result." (match marionette - (($ <marionette> command pid monitor repl) + (($ <marionette> command pid monitor (= force repl)) (write exp repl) (newline repl) (read repl)))) |