From 26ed1a755966d20cb5f2cd8a77d55a981fe6e965 Mon Sep 17 00:00:00 2001 From: John Soo Date: Wed, 4 Nov 2020 07:51:52 -0800 Subject: [PATCH] processes: Optionally normalize recutils output. * guix/scripts/processes.scm: Add "normalize" flag --- doc/guix.texi | 26 ++++++++++ guix/scripts/processes.scm | 104 ++++++++++++++++++++++++++++++++----- 2 files changed, 118 insertions(+), 12 deletions(-) diff --git a/doc/guix.texi b/doc/guix.texi index 5e3e0435b4..ed54c26072 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -12691,6 +12691,32 @@ ClientPID: 19419 ClientCommand: cuirass --cache-directory /var/cache/cuirass @dots{} @end example +Additional options are listed below. + +@table @code +@item --normalize +Normalize the output records into record sets (@pxref{Record Sets,,, +recutils, GNU recutils manual}). Normalizing into record sets allows +joins across record types. + +@example +$ guix processes --normalize | \ + recsel \ + -j Session \ + -t ChildProcess \ + -p Session.PID,PID \ + -e 'Session.ClientCommand ~ build' +Session_PID: 4278 +PID: 4435 + +Session_PID: 4278 +PID: 4554 + +Session_PID: 4278 +PID: 4646 +@end example +@end table + @node System Configuration @chapter System Configuration diff --git a/guix/scripts/processes.scm b/guix/scripts/processes.scm index b4ca7b1687..6497cd5c2f 100644 --- a/guix/scripts/processes.scm +++ b/guix/scripts/processes.scm @@ -176,6 +176,9 @@ active sessions, and the master 'guix-daemon' process." (values (filter-map child-process->session children) master))) +(define (lock->record lock port) + (format port "LockHeld: ~a~%" lock)) + (define (daemon-session->recutils session port) "Display SESSION information in recutils format on PORT." (format port "SessionPID: ~a~%" @@ -184,8 +187,7 @@ active sessions, and the master 'guix-daemon' process." (process-id (daemon-session-client session))) (format port "ClientCommand:~{ ~a~}~%" (process-command (daemon-session-client session))) - (for-each (lambda (lock) - (format port "LockHeld: ~a~%" lock)) + (for-each (lambda (lock) (lock->record lock port)) (daemon-session-locks-held session)) (for-each (lambda (process) (format port "ChildProcess: ~a:~{ ~a~}~%" @@ -193,6 +195,81 @@ active sessions, and the master 'guix-daemon' process." (process-command process))) (daemon-session-children session))) +(define (format-single-record port) + "Display denormalized session information to PORT." + (for-each (lambda (session) + (daemon-session->recutils session port) + (newline port)) + (daemon-sessions))) + +(define session-rec-type + ;; Also includes ClientCommand and LockHeld but it doesn't seem to be + ;; possible to express a plain string field (the default) without further + ;; restrictions + "%rec: Session +%type: PID int +%type: ClientPID int +%key: PID") + +(define child-process-rec-type + ;; Also includes Command but it doesn't seem to be possible to + ;; express a plain string field (the default) without further restrictions + "%rec: ChildProcess +%type: Session rec Session +%type: PID int +%key: PID") + +(define (session-key->field session port) + "Display SESSION PID as field on PORT." + (format + port "Session: ~a" + (process-id (daemon-session-process session)))) + +(define (session-scalars->normalized-record session port) + "Display SESSION scalar fields to PORT in normalized form." + (format port "PID: ~a~%" + (process-id (daemon-session-process session))) + (format port "ClientPID: ~a~%" + (process-id (daemon-session-client session))) + (format port "ClientCommand:~{ ~a~}~%" + (process-command (daemon-session-client session)))) + +(define (child-process->normalized-record process port) + "Display PROCESS record on PORT in normalized form" + (format port "PID: ~a" (process-id process)) + (newline port) + (format port "Command:~{ ~a~}" (process-command process))) + +(define (format-normalized port) + (define sessions (daemon-sessions)) + + (format port session-rec-type) + (newline port) + (newline port) + (for-each + (lambda (session) + (session-scalars->normalized-record session port) + (for-each + (lambda (lock) (lock->record lock port)) + (daemon-session-locks-held session)) + (newline port)) + sessions) + + (format port child-process-rec-type) + (newline port) + (newline port) + (for-each + (lambda (session) + (for-each + (lambda (process) + (session-key->field session port) + (newline port) + (child-process->normalized-record process port) + (newline port) + (newline port)) + (daemon-session-children session))) + sessions)) + ;;; ;;; Options. @@ -205,7 +282,10 @@ active sessions, and the master 'guix-daemon' process." (exit 0))) (option '(#\V "version") #f #f (lambda args - (show-version-and-exit "guix processes"))))) + (show-version-and-exit "guix processes"))) + (option '("normalize") #f #f + (lambda (opt name arg result) + (alist-cons 'normalize #t result))))) (define (show-help) (display (G_ "Usage: guix processes @@ -216,8 +296,13 @@ List the current Guix sessions and their processes.")) (display (G_ " -V, --version display version information and exit")) (newline) + (display (G_ " + --normalize display results as normalized record sets")) + (newline) (show-bug-report-information)) +(define %default-options '()) + ;;; ;;; Entry point. @@ -227,17 +312,12 @@ List the current Guix sessions and their processes.")) (category plumbing) (synopsis "list currently running sessions") (define options - (args-fold* args %options - (lambda (opt name arg result) - (leave (G_ "~A: unrecognized option~%") name)) - cons - '())) + (parse-command-line args %options (list %default-options))) (with-paginated-output-port port - (for-each (lambda (session) - (daemon-session->recutils session port) - (newline port)) - (daemon-sessions)) + (match (assoc-ref options 'normalize) + (#t (format-normalized port)) + (_ (format-single-record port))) ;; Pass 'R' (instead of 'r') so 'less' correctly estimates line length. #:less-options "FRX")) -- 2.29.1