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challenge: Return comparison reports instead of just discrepancies.
This makes it easier to distinguish between matches, mismatches, and the
various cases of inconclusive reports.
* guix/scripts/challenge.scm (<discrepancy>): Rename to...
(<comparison-report>): ... this. Add 'result' field.
(comparison-report): New macro.
(comparison-report-predicate, comparison-report-mismatch?)
(comparison-report-match?)
(comparison-report-inconclusive?): New procedures.
(discrepancies): Rename to...
(compare-contents): ... this. Change to return a list of
<comparison-report>. Remove calls to 'warning'.
(summarize-discrepancy): Rename to...
(summarize-report): ... this. Adjust to <comparison-report>.
(guix-challenge): Likewise.
* tests/challenge.scm ("no discrepancies")
("one discrepancy"): Adjust to new API.
("inconclusive: no substitutes")
("inconclusive: no local build"): New tests.
This commit is contained in:
Ludovic Courtès
parent
7988af9919
commit
4d8e95097e
2 changed files with 151 additions and 70 deletions
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@ -1,5 +1,5 @@
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2015, 2016 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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@ -37,12 +37,17 @@ (define-module (guix scripts challenge)
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#:use-module (ice-9 vlist)
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#:use-module (ice-9 format)
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#:use-module (web uri)
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#:export (discrepancies
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#:export (compare-contents
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discrepancy?
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discrepancy-item
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discrepancy-local-sha256
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discrepancy-narinfos
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comparison-report?
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comparison-report-item
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comparison-report-result
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comparison-report-local-sha256
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comparison-report-narinfos
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comparison-report-match?
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comparison-report-mismatch?
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comparison-report-inconclusive?
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guix-challenge))
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@ -61,13 +66,38 @@ (define-module (guix scripts challenge)
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(define ensure-store-item ;XXX: move to (guix ui)?
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(@@ (guix scripts size) ensure-store-item))
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;; Representation of a hash mismatch for ITEM.
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(define-record-type <discrepancy>
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(discrepancy item local-sha256 narinfos)
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discrepancy?
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(item discrepancy-item) ;string, /gnu/store/… item
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(local-sha256 discrepancy-local-sha256) ;bytevector | #f
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(narinfos discrepancy-narinfos)) ;list of <narinfo>
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;; Representation of a comparison report for ITEM.
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(define-record-type <comparison-report>
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(%comparison-report item result local-sha256 narinfos)
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comparison-report?
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(item comparison-report-item) ;string, /gnu/store/… item
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(result comparison-report-result) ;'match | 'mismatch | 'inconclusive
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(local-sha256 comparison-report-local-sha256) ;bytevector | #f
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(narinfos comparison-report-narinfos)) ;list of <narinfo>
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(define-syntax comparison-report
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;; Some sort of a an enum to make sure 'result' is correct.
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(syntax-rules (match mismatch inconclusive)
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((_ item 'match rest ...)
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(%comparison-report item 'match rest ...))
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((_ item 'mismatch rest ...)
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(%comparison-report item 'mismatch rest ...))
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((_ item 'inconclusive rest ...)
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(%comparison-report item 'inconclusive rest ...))))
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(define (comparison-report-predicate result)
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"Return a predicate that returns true when pass a REPORT that has RESULT."
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(lambda (report)
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(eq? (comparison-report-result report) result)))
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(define comparison-report-mismatch?
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(comparison-report-predicate 'mismatch))
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(define comparison-report-match?
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(comparison-report-predicate 'match))
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(define comparison-report-inconclusive?
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(comparison-report-predicate 'inconclusive))
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(define (locally-built? store item)
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"Return true if ITEM was built locally."
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@ -88,10 +118,10 @@ (define (query-locally-built-hash item)
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(define-syntax-rule (report args ...)
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(format (current-error-port) args ...))
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(define (discrepancies items servers)
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(define (compare-contents items servers)
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"Challenge the substitute servers whose URLs are listed in SERVERS by
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comparing the hash of the substitutes of ITEMS that they serve. Return the
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list of discrepancies.
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list of <comparison-report> objects.
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This procedure does not authenticate narinfos from SERVERS, nor does it verify
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that they are signed by an authorized public keys. The reason is that, by
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@ -100,11 +130,7 @@ (define (discrepancies items servers)
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(define (compare item reference)
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;; Return a procedure to compare the hash of ITEM with REFERENCE.
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(lambda (narinfo url)
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(if (not narinfo)
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(begin
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(warning (_ "~a: no substitute at '~a'~%")
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item url)
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#t)
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(or (not narinfo)
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(let ((value (narinfo-hash->sha256 (narinfo-hash narinfo))))
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(bytevector=? reference value)))))
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@ -116,9 +142,7 @@ (define (select-reference item narinfos urls)
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((url urls ...)
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(if (not first)
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(select-reference item narinfos urls)
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(narinfo-hash->sha256 (narinfo-hash first))))))
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(()
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(warning (_ "no substitutes for '~a'; cannot conclude~%") item))))
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(narinfo-hash->sha256 (narinfo-hash first))))))))
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(mlet* %store-monad ((local (mapm %store-monad
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query-locally-built-hash items))
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@ -130,42 +154,54 @@ (define (select-reference item narinfos urls)
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vhash))
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vlist-null
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remote)))
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(return (filter-map (lambda (item local)
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(let ((narinfos (vhash-fold* cons '() item narinfos)))
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(define reference
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(or local
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(begin
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(warning (_ "no local build for '~a'~%") item)
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(select-reference item narinfos servers))))
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(return (map (lambda (item local)
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(match (vhash-fold* cons '() item narinfos)
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(() ;no substitutes
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(comparison-report item 'inconclusive local '()))
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((narinfo)
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(if local
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(if ((compare item local) narinfo (first servers))
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(comparison-report item 'match
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local (list narinfo))
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(comparison-report item 'mismatch
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local (list narinfo)))
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(comparison-report item 'inconclusive
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local (list narinfo))))
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((narinfos ...)
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(let ((reference
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(or local (select-reference item narinfos
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servers))))
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(if (every (compare item reference) narinfos servers)
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(comparison-report item 'match
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local narinfos)
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(comparison-report item 'mismatch
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local narinfos))))))
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items
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local))))
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(if (every (compare item reference)
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narinfos servers)
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#f
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(discrepancy item local narinfos))))
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items
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local))))
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(define* (summarize-discrepancy discrepancy
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#:key (hash->string
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bytevector->nix-base32-string))
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"Write to the current error port a summary of DISCREPANCY, a <discrepancy>
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object that denotes a hash mismatch."
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(match discrepancy
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(($ <discrepancy> item local (narinfos ...))
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(define* (summarize-report comparison-report
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#:key (hash->string
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bytevector->nix-base32-string))
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"Write to the current error port a summary of REPORT, a <comparison-report>
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object."
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(match comparison-report
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(($ <comparison-report> item 'mismatch local (narinfos ...))
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(report (_ "~a contents differ:~%") item)
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(if local
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(report (_ " local hash: ~a~%") (hash->string local))
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(warning (_ "no local build for '~a'~%") item))
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(report (_ " no local build for '~a'~%") item))
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(for-each (lambda (narinfo)
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(if narinfo
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(report (_ " ~50a: ~a~%")
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(uri->string (narinfo-uri narinfo))
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(hash->string
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(narinfo-hash->sha256 (narinfo-hash narinfo))))
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(report (_ " ~50a: unavailable~%")
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(uri->string (narinfo-uri narinfo)))))
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narinfos))))
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(report (_ " ~50a: ~a~%")
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(uri->string (narinfo-uri narinfo))
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(hash->string
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(narinfo-hash->sha256 (narinfo-hash narinfo)))))
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narinfos))
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(($ <comparison-report> item 'inconclusive #f narinfos)
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(warning (_ "could not challenge '~a': no local build~%") item))
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(($ <comparison-report> item 'inconclusive locals ())
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(warning (_ "could not challenge '~a': no substitutes~%") item))
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(($ <comparison-report> item 'match)
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#t)))
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;;;
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@ -236,13 +272,14 @@ (define (guix-challenge . args)
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#:use-substitutes? #f)
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(run-with-store store
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(mlet* %store-monad ((items (mapm %store-monad
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ensure-store-item files))
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(issues (discrepancies items urls)))
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(for-each summarize-discrepancy issues)
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(unless (null? issues)
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(exit 2))
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(return (null? issues)))
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(mlet* %store-monad ((items (mapm %store-monad
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ensure-store-item files))
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(reports (compare-contents items urls)))
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(for-each summarize-report reports)
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(exit (cond ((any comparison-report-mismatch? reports) 2)
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((every comparison-report-match? reports) 0)
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(else 1))))
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#:system system))))))))
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;;; challenge.scm ends here
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@ -1,5 +1,5 @@
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2015 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2015, 2017 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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@ -69,8 +69,15 @@ (define-syntax with-derivation-narinfo*
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(built-derivations (list drv))
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(mlet %store-monad ((hash (query-path-hash* out)))
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(with-derivation-narinfo* drv (sha256 => hash)
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(>>= (discrepancies (list out) (%test-substitute-urls))
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(lift1 null? %store-monad))))))))
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(>>= (compare-contents (list out) (%test-substitute-urls))
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(match-lambda
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((report)
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(return
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(and (string=? out (comparison-report-item report))
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(bytevector=?
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(comparison-report-local-sha256 report)
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hash)
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(comparison-report-match? report))))))))))))
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(test-assertm "one discrepancy"
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(let ((text (random-text)))
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@ -90,20 +97,57 @@ (define-syntax with-derivation-narinfo*
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(modulo (+ b 1) 128))
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w)))
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(with-derivation-narinfo* drv (sha256 => wrong-hash)
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(>>= (discrepancies (list out) (%test-substitute-urls))
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(>>= (compare-contents (list out) (%test-substitute-urls))
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(match-lambda
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((discrepancy)
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((report)
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(return
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(and (string=? out (discrepancy-item discrepancy))
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(and (string=? out (comparison-report-item (pk report)))
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(eq? 'mismatch (comparison-report-result report))
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(bytevector=? hash
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(discrepancy-local-sha256
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discrepancy))
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(match (discrepancy-narinfos discrepancy)
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(comparison-report-local-sha256
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report))
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(match (comparison-report-narinfos report)
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((bad)
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(bytevector=? wrong-hash
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(narinfo-hash->sha256
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(narinfo-hash bad))))))))))))))))
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(test-assertm "inconclusive: no substitutes"
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(mlet* %store-monad ((drv (gexp->derivation "foo" #~(mkdir #$output)))
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(out -> (derivation->output-path drv))
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(_ (built-derivations (list drv)))
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(hash (query-path-hash* out)))
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(>>= (compare-contents (list out) (%test-substitute-urls))
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(match-lambda
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((report)
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(return
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(and (string=? out (comparison-report-item report))
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(comparison-report-inconclusive? report)
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(null? (comparison-report-narinfos report))
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(bytevector=? (comparison-report-local-sha256 report)
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hash))))))))
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(test-assertm "inconclusive: no local build"
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(let ((text (random-text)))
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(mlet* %store-monad ((drv (gexp->derivation "something"
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#~(list #$output #$text)))
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(out -> (derivation->output-path drv))
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(hash -> (sha256 #vu8())))
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(with-derivation-narinfo* drv (sha256 => hash)
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(>>= (compare-contents (list out) (%test-substitute-urls))
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(match-lambda
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((report)
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(return
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(and (string=? out (comparison-report-item report))
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(comparison-report-inconclusive? report)
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(not (comparison-report-local-sha256 report))
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(match (comparison-report-narinfos report)
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((narinfo)
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(bytevector=? (narinfo-hash->sha256
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(narinfo-hash narinfo))
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hash))))))))))))
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(test-end)
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;;; Local Variables:
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