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offload: Reuse SSH session during 'transfer-and-offload'.

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* guix/scripts/offload.scm (remote-pipe): Replace 'machine' parameter
with 'session'.  Remove 'open-ssh-session' call.
(register-gc-root): Replace 'machine' with 'session'.  Use '
session-get' instead of 'build-machine-name'.
(remove-gc-roots, offload, send-files, retrieve-files): Likewise.
(transfer-and-offload): Add 'open-ssh-session' call.  Handle 'offload'
errors here.
(machine-load): Add call to 'open-ssh-session'.
This commit is contained in:
Ludovic Courtès 2016-11-02 12:00:47 +01:00
parent 21531add32
commit 9e76eed37f
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GPG key ID: 090B11993D9AEBB5
1 changed files with 43 additions and 41 deletions
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82
guix/scripts/offload.scm
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@ -197,9 +197,9 @@ (define (open-ssh-session machine)
session))
(define* (remote-pipe machine command
(define* (remote-pipe session command
#:key (quote? #t))
"Run COMMAND (a list) on MACHINE, and return an open input/output port,
"Run COMMAND (a list) on SESSION, and return an open input/output port,
which is also an SSH channel. When QUOTE? is true, perform shell-quotation of
all the elements of COMMAND."
(define (shell-quote str)
@ -209,9 +209,7 @@ (define (shell-quote str)
(lambda ()
(write str))))
;; TODO: Use (ssh popen) instead.
(let* ((session (open-ssh-session machine))
(channel (make-channel session)))
(let* ((channel (make-channel session)))
(channel-open-session channel)
(channel-request-exec channel
(string-join (if quote?
@ -312,8 +310,9 @@ (define %gc-root-file
;; File name of the temporary GC root we install.
(format #f "offload-~a-~a" (gethostname) (getpid)))
(define (register-gc-root file machine)
"Mark FILE, a store item, as a garbage collector root on MACHINE."
(define (register-gc-root file session)
"Mark FILE, a store item, as a garbage collector root in SESSION. Return
the exit status, zero on success."
(define script
`(begin
(use-modules (guix config))
@ -344,7 +343,7 @@ (define script
(unless (= EEXIST (system-error-errno args))
(apply throw args)))))))
(let ((pipe (remote-pipe machine
(let ((pipe (remote-pipe session
`("guile" "-c" ,(object->string script)))))
(read-string pipe)
(let ((status (channel-get-exit-status pipe)))
@ -353,10 +352,10 @@ (define script
;; Better be safe than sorry: if we ignore the error here, then FILE
;; may be GC'd just before we start using it.
(leave (_ "failed to register GC root for '~a' on '~a' (status: ~a)~%")
file (build-machine-name machine) status)))))
file (session-get session 'host) status)))))
(define (remove-gc-roots machine)
"Remove from MACHINE the GC roots previously installed with
(define (remove-gc-roots session)
"Remove in SESSION the GC roots previously installed with
'register-gc-root'."
(define script
`(begin
@ -377,24 +376,19 @@ (define script
(false-if-exception (delete-file file)))
roots)))))
(let ((pipe (remote-pipe machine
(let ((pipe (remote-pipe session
`("guile" "-c" ,(object->string script)))))
(read-string pipe)
(close-port pipe)))
(define* (offload drv machine
(define* (offload drv session
#:key print-build-trace? (max-silent-time 3600)
build-timeout (log-port (build-log-port)))
"Perform DRV on MACHINE, assuming DRV and its prerequisites are available
"Perform DRV in SESSION, assuming DRV and its prerequisites are available
there, and write the build log to LOG-PORT. Return the exit status."
(format (current-error-port) "offloading '~a' to '~a'...~%"
(derivation-file-name drv) (build-machine-name machine))
(format (current-error-port) "@ build-remote ~a ~a~%"
(derivation-file-name drv) (build-machine-name machine))
;; Normally DRV has already been protected from GC when it was transferred.
;; The '-r' flag below prevents the build result from being GC'd.
(let ((pipe (remote-pipe machine
(let ((pipe (remote-pipe session
`("guix" "build"
"-r" ,%gc-root-file
,(format #f "--max-silent-time=~a"
@ -432,23 +426,31 @@ (define* (transfer-and-offload drv machine
"Offload DRV to MACHINE. Prior to the actual offloading, transfer all of
INPUTS to MACHINE; if building DRV succeeds, retrieve all of OUTPUTS from
MACHINE."
(define session
(open-ssh-session machine))
(when (begin
(register-gc-root (derivation-file-name drv) machine)
(register-gc-root (derivation-file-name drv) session)
(send-files (cons (derivation-file-name drv) inputs)
machine))
(let ((status (offload drv machine
session))
(format (current-error-port) "offloading '~a' to '~a'...~%"
(derivation-file-name drv) (build-machine-name machine))
(format (current-error-port) "@ build-remote ~a ~a~%"
(derivation-file-name drv) (build-machine-name machine))
(let ((status (offload drv session
#:print-build-trace? print-build-trace?
#:max-silent-time max-silent-time
#:build-timeout build-timeout)))
(if (zero? status)
(begin
(retrieve-files outputs machine)
(remove-gc-roots machine)
(retrieve-files outputs session)
(remove-gc-roots session)
(format (current-error-port)
"done with offloaded '~a'~%"
(derivation-file-name drv)))
(begin
(remove-gc-roots machine)
(remove-gc-roots session)
(format (current-error-port)
"derivation '~a' offloaded to '~a' failed \
with exit code ~a~%"
@ -460,13 +462,13 @@ (define* (transfer-and-offload drv machine
;; interprets other non-zero codes as transient build failures.
(primitive-exit 100))))))
(define (send-files files machine)
"Send the subset of FILES that's missing to MACHINE's store. Return #t on
(define (send-files files session)
"Send the subset of FILES that's missing to SESSION's store. Return #t on
success, #f otherwise."
(define (missing-files files)
;; Return the subset of FILES not already on MACHINE. Use 'head' as a
;; Return the subset of FILES not already on SESSION. Use 'head' as a
;; hack to make sure the remote end stops reading when we're done.
(let* ((pipe (remote-pipe machine
(let* ((pipe (remote-pipe session
`("guix" "archive" "--missing")
#:quote? #f)))
(format pipe "~{~a~%~}" files)
@ -476,18 +478,17 @@ (define (missing-files files)
(with-store store
(guard (c ((nix-protocol-error? c)
(warning (_ "failed to export files for '~a': ~s~%")
(build-machine-name machine)
c)
(session-get session 'host) c)
#f))
;; Compute the subset of FILES missing on MACHINE, and send them in
;; Compute the subset of FILES missing on SESSION, and send them in
;; topologically sorted order so that they can actually be imported.
(let* ((files (missing-files (topologically-sorted store files)))
(pipe (remote-pipe machine
(pipe (remote-pipe session
'("guix" "archive" "--import")
#:quote? #f)))
(format #t (_ "sending ~a store files to '~a'...~%")
(length files) (build-machine-name machine))
(length files) (session-get session 'host))
(export-paths store files pipe)
(channel-send-eof pipe)
@ -497,12 +498,12 @@ (define (missing-files files)
(close pipe)
status)))))
(define (retrieve-files files machine)
"Retrieve FILES from MACHINE's store, and import them."
(define (retrieve-files files session)
"Retrieve FILES from SESSION's store, and import them."
(define host
(build-machine-name machine))
(session-get session 'host))
(let ((pipe (remote-pipe machine
(let ((pipe (remote-pipe session
`("guix" "archive" "--export" ,@files)
#:quote? #f)))
(and pipe
@ -538,7 +539,8 @@ (define (machine-matches? machine requirements)
(define (machine-load machine)
"Return the load of MACHINE, divided by the number of parallel builds
allowed on MACHINE."
(let* ((pipe (remote-pipe machine '("cat" "/proc/loadavg")))
(let* ((session (open-ssh-session machine))
(pipe (remote-pipe session '("cat" "/proc/loadavg")))
(line (read-line pipe)))
(close-port pipe)