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Mon, 05 Jul 2021 08:39:46 -0700 (PDT) From: Andrew Tropin Date: Mon, 05 Jul 2021 18:39:44 +0300 Message-ID: <87v95ohirj.fsf@trop.in> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: guix-patches@gnu.org List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-patches-bounces+larch=yhetil.org@gnu.org Sender: "Guix-patches" X-Migadu-Flow: FLOW_IN ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1625499615; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version: content-type:content-type:resent-cc:resent-from:resent-sender: resent-message-id:in-reply-to:in-reply-to:references:references: list-id:list-help:list-unsubscribe:list-subscribe:list-post: dkim-signature; bh=dwC+Awze15IQEGkGUnsJ1pi+Ep/p/mnsOcQsUpsvppE=; 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dkim=fail ("body hash did not verify") header.d=trop-in.20150623.gappssmtp.com header.s=20150623 header.b=ucVJhbYC; dmarc=none; spf=pass (aspmx1.migadu.com: domain of guix-patches-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=guix-patches-bounces@gnu.org X-Migadu-Queue-Id: 36A0E1B61A X-Spam-Score: -1.01 X-Migadu-Scanner: scn0.migadu.com X-TUID: 1mqOTC/DHoTn --=-=-= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Service allows to trigger actions during activation if file or directory specified by pattern is changed. =2D-- gnu/home-services.scm | 95 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 94 insertions(+), 1 deletion(-) diff --git a/gnu/home-services.scm b/gnu/home-services.scm index 44a7e68934..002a003d65 100644 =2D-- a/gnu/home-services.scm +++ b/gnu/home-services.scm @@ -37,7 +37,8 @@ home-environment-variables-service-type home-files-service-type home-run-on-first-login-service-type =2D home-activation-service-type) + home-activation-service-type + home-run-on-change-service-type) =20 #:re-export (service service-type @@ -326,3 +327,95 @@ directory. @command{activate} script automatically ca= lled during reconfiguration or generation switching. This service can be extended with one gexp, but many times, and all gexps must be idempotent."))) =20 + +;;; +;;; On-change. +;;; + +(define (compute-on-change-gexp eval-gexps? pattern-gexp-tuples) + #~(begin + (define (equal-regulars? file1 file2) + "Check if FILE1 and FILE2 are bit for bit identical." + (let* ((cmp-binary #$(file-append + (@@ (gnu packages base) diffutils) "/bin/cmp= ")) + (status (system* cmp-binary file1 file2))) + (=3D status 0))) + + (define (equal-symlinks? symlink1 symlink2) + "Check if SYMLINK1 and SYMLINK2 are pointing to the same target." + (string=3D? (readlink symlink1) (readlink symlink2))) + + (define (equal-directories? dir1 dir2) + "Check if DIR1 and DIR2 have the same content." + (define (ordinary-file file) + (not (or (string=3D? file ".") + (string=3D? file "..")))) + (let* ((files1 (scandir dir1 ordinary-file)) + (files2 (scandir dir2 ordinary-file))) + (if (equal? files1 files2) + (map (lambda (file) + (equal-files? + (string-append dir1 "/" file) + (string-append dir2 "/" file))) + files1) + #f))) + + (define (equal-files? file1 file2) + "Compares files, symlinks or directories of the same type." + (case (file-type file1) + ((directory) (equal-directories? file1 file2)) + ((symlink) (equal-symlinks? file1 file2)) + ((regular) (equal-regulars? file1 file2)) + (else + (display "The file type is unsupported by on-change service.\n") + #f))) + + (define (file-type file) + (stat:type (lstat file))) + + (define (something-changed? file1 file2) + (cond + ((and (not (file-exists? file1)) + (not (file-exists? file2))) #f) + ((or (not (file-exists? file1)) + (not (file-exists? file2))) #t) + + ((not (eq? (file-type file1) (file-type file2))) #t) + + (else + (not (equal-files? file1 file2))))) + + (define expressions-to-eval + (map + (lambda (x) + (let* ((file1 (string-append (getenv "GUIX_OLD_HOME") "/" (car = x))) + (file2 (string-append (getenv "GUIX_NEW_HOME") "/" (car = x))) + (_ (format #t "Comparing ~a and\n~10t~a..." file1 file2)) + (any-changes? (something-changed? file1 file2)) + (_ (format #t " done (~a)\n" + (if any-changes? "changed" "same")))) + (if any-changes? (cadr x) ""))) + '#$pattern-gexp-tuples)) + + (if #$eval-gexps? + (begin + (display "Evaling on-change gexps.\n\n") + (for-each primitive-eval expressions-to-eval) + (display "On-change gexps evaluation finished.\n\n")) + (display "\ +On-change gexps won't evaluated, disabled by service configuration.\n")))) + +(define home-run-on-change-service-type + (service-type (name 'home-run-on-change) + (extensions + (list (service-extension + home-activation-service-type + identity))) + (compose concatenate) + (extend compute-on-change-gexp) + (default-value #t) + (description "\ +G-expressions to run if the specified files have changed since the +last generation. The extension should be a list of lists where the +first element is the pattern for file or directory that expected to be +changed, and the second element is the G-expression to be evaluated."))) =2D-=20 2.32.0 --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQJDBAEBCgAtFiEEKEGaxlA4dEDH6S/6IgjSCVjB3rAFAmDjJ8APHGFuZHJld0B0 cm9wLmluAAoJECII0glYwd6waMIP/iftqlC/BHYKJZUXuGla6gqEyIZy495xHJGq ZPHSZaIcqnGjTx2A7J5+w6xTsDgnRzTAzXtJ+7Wx31sS3mk1noVSBDVxA7HGsFu4 KUP/gjjRxm9qsegRtWWrvHjDrRpmTfG460/HOvS5b80gVlr0o8A1UL/O7fElPqk9 rr0vbx18f/FB+m0EwiApk2g26ORrHEDL4YhIT+fvW3JxgGTCTVUF+T6DyiRa2wKa cIH6pVi2DFzNEIECfbi6adWkNNLgX/PY+shrQJZTVopDPRu0oND04wL/TZWvryfK BW9Gigi6Ma2iSj47qn1+RicUKNZi6NJgnv+jUBngSxhFDWfQBLJgMJKgGB6agNFW gLcwFTe6KHdgrOu2oiH9Cc4uhUQw+g3ddCR8mfkSvST/RafMWgOrptFWspHrLfMH F3uTMGlUJ76m+9sjdFkgI4vdvzWSX96M94ddkWFJFSG0KhRtqQ9kCf01MM7bRDFL QRtQ7zhgUOoAQlz5xSs5aTh+2FkGf0Xdd5itUP8IGXzYhtQLvm2/HhaRF035YoDu c4qWmvS5454VG152u1Bz/QsM95uxZSEPChqEIyquSFcyX5WUQHDVa2e6RoO1DmFY EBYy4XwnzCKaLpWvarC3z9E7SCYJIBkSqb4oV3OLtklHiADFSu8LD7UdYmK8vKFU JytNaSV7 =Zq/L -----END PGP SIGNATURE----- --=-=-=--