From owner-dev-commits-src-branches@freebsd.org Fri Jan 15 14:27:03 2021 Return-Path: Delivered-To: dev-commits-src-branches@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 4F96C4E71E4; Fri, 15 Jan 2021 14:27:03 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4DHNmQ6nRBz51LP; Fri, 15 Jan 2021 14:27:02 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 605A21D9E0; Fri, 15 Jan 2021 14:27:01 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 10FER18k013790; Fri, 15 Jan 2021 14:27:01 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 10FER1KJ013789; Fri, 15 Jan 2021 14:27:01 GMT (envelope-from git) Date: Fri, 15 Jan 2021 14:27:01 GMT Message-Id: <202101151427.10FER1KJ013789@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Ed Maste Subject: git: 23b5fa56a182 - stable/12 - cmp: fix -s (silent) when used with skip offsets MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: emaste X-Git-Repository: src X-Git-Refname: refs/heads/stable/12 X-Git-Reftype: branch X-Git-Commit: 23b5fa56a182574fef416caeb55e6c735087e411 Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-branches@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commits to the stable branches of the FreeBSD src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 Jan 2021 14:27:04 -0000 The branch stable/12 has been updated by emaste: URL: https://cgit.FreeBSD.org/src/commit/?id=23b5fa56a182574fef416caeb55e6c735087e411 commit 23b5fa56a182574fef416caeb55e6c735087e411 Author: Ed Maste AuthorDate: 2021-01-11 00:02:56 +0000 Commit: Ed Maste CommitDate: 2021-01-15 14:25:36 +0000 cmp: fix -s (silent) when used with skip offsets -s causes cmp to print nothing for differing files, for use when only the exit status is of interest. -z compares the file size first, for regular files, and fails the comparison early if they do not match. Prior to this change -s implied -z as an optimization, but this is not valid when file offsets are specified. Now, enable the -z optimization for -s only if both skip arguments are not provided / 0. Note that using -z with differing skip values will currently always fail. We may want to compare size1 - skip1 with size2 - skip2 instaead, and in any case the man page should be clarified. PR: 252542 Fixes: 3e6902efc802ab57fc4e9bf798f2d271b152e7f9 Reported by: William Ahern Reviewed by: markj Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D28071 (cherry picked from commit 80445b7a3f738e0b0a33ee7a11905a275346a6de) --- usr.bin/cmp/cmp.c | 4 +++- usr.bin/cmp/tests/cmp_test2.sh | 14 ++++++++++++++ 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/usr.bin/cmp/cmp.c b/usr.bin/cmp/cmp.c index c762f1346abf..47f9b671985c 100644 --- a/usr.bin/cmp/cmp.c +++ b/usr.bin/cmp/cmp.c @@ -92,7 +92,6 @@ main(int argc, char *argv[]) break; case 's': /* silent run */ sflag = true; - zflag = true; break; case 'x': /* hex output */ lflag = true; @@ -149,6 +148,9 @@ main(int argc, char *argv[]) skip1 = argc > 2 ? strtol(argv[2], NULL, 0) : 0; skip2 = argc == 4 ? strtol(argv[3], NULL, 0) : 0; + if (sflag && skip1 == 0 && skip2 == 0) + zflag = true; + if (fd1 == -1) { if (fd2 == -1) { c_link(file1, skip1, file2, skip2); diff --git a/usr.bin/cmp/tests/cmp_test2.sh b/usr.bin/cmp/tests/cmp_test2.sh index 2b0d66382d36..7f9801fc92bd 100755 --- a/usr.bin/cmp/tests/cmp_test2.sh +++ b/usr.bin/cmp/tests/cmp_test2.sh @@ -62,8 +62,22 @@ symlink_body() { atf_check -s not-exit:0 -o ignore -e ignore cmp -h a.lnk adup.lnk } +atf_test_case pr252542 +pr252542_head() +{ + atf_set "descr" "Test cmp(1) -s with file offset skips" +} +pr252542_body() +{ + echo -n '1234567890' > a + echo -n 'abc567890' > b + atf_check -s exit:0 cmp -s a b 4 3 + atf_check -s exit:1 -o ignore cmp -z a b 4 3 +} + atf_init_test_cases() { atf_add_test_case special atf_add_test_case symlink + atf_add_test_case pr252542 }