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Mon, 19 Aug 2024 16:04:23 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 413h3pbb7h-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 19 Aug 2024 16:04:23 +0000 Received: from phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 47JG3Fet014254; Mon, 19 Aug 2024 16:04:22 GMT Received: from localhost.localdomain (dhcp-10-175-39-147.vpn.oracle.com [10.175.39.147]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTP id 413h3pb9w5-10; Mon, 19 Aug 2024 16:04:22 +0000 From: Vegard Nossum To: Masahiro Yamada , linux-kbuild@vger.kernel.org Cc: Nathan Chancellor , Nicolas Schier , Michael Ellerman , Morten Linderud , Haelwenn Monnier , Jann Horn , Kees Cook , James Bottomley , Theodore Ts'o , linux-hardening@vger.kernel.org, Vegard Nossum Subject: [RFC PATCH 09/11] kbuild: simplify commands in --dry-run mode Date: Mon, 19 Aug 2024 18:03:06 +0200 Message-Id: <20240819160309.2218114-10-vegard.nossum@oracle.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240819160309.2218114-1-vegard.nossum@oracle.com> References: <20240819160309.2218114-1-vegard.nossum@oracle.com> Precedence: bulk X-Mailing-List: linux-kbuild@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-08-19_13,2024-08-19_03,2024-05-17_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 suspectscore=0 adultscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 malwarescore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2407110000 definitions=main-2408190107 X-Proofpoint-ORIG-GUID: 2S5DyqFBWt4B_J4K_yjFpmQjqe900A57 X-Proofpoint-GUID: 2S5DyqFBWt4B_J4K_yjFpmQjqe900A57 - $filechk is used to check if a file is up to date. - $cmd includes logic for echoing commands and deleting intermediate files on interrupt. Skip all of that in --dry-run mode and just execute the command. - $cmd_and_savecmd executes the command and echoes it into ..cmd. - $if_changed_dep executes the command if any dependencies have changed. - $cmd_and_fixdep executes the command and updates ..cmd. Skip all of that in --dry-run mode and just execute the command. Signed-off-by: Vegard Nossum --- scripts/Kbuild.include | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include index ed8a7493524b2..a1ef3b1828bb3 100644 --- a/scripts/Kbuild.include +++ b/scripts/Kbuild.include @@ -94,6 +94,7 @@ kecho := $($(quiet)kecho) # - If no file exist it is created # - If the content differ the new file is used # - If they are equal no change, and no timestamp update +ifndef dry_run define filechk $(check-FORCE) $(Q)set -e; \ @@ -105,6 +106,14 @@ define filechk mv -f $(tmp-target) $@; \ fi endef +else +# simplify and write the output directly if we're just printing +# the commands +define filechk + mkdir -p $(dir $@) + { $(filechk_$(1)); } > $@ +endef +endif ### # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= @@ -149,8 +158,13 @@ delete-on-interrupt = \ $(foreach sig, HUP INT QUIT TERM PIPE, \ trap 'rm -f $@; trap - $(sig); kill -s $(sig) $$$$' $(sig);)) +ifndef dry_run # print and execute commands cmd = @$(if $(cmd_$(1)),set -e; $($(quiet)log_print) $(delete-on-interrupt) $(cmd_$(1)),:) +else +# just execute (...which will actually "just print" with make -n) +cmd = @$(if $(cmd_$(1)),$(cmd_$(1)),) +endif ### # if_changed - execute command if any prerequisite is newer than @@ -196,17 +210,30 @@ if-changed-cond = $(newer-prereqs)$(cmd-check)$(check-FORCE) # Execute command if command has changed or prerequisite(s) are updated. if_changed = $(if $(if-changed-cond),$(cmd_and_savecmd),@:) +ifndef dry_run cmd_and_savecmd = \ $(cmd); \ printf '%s\n' 'savedcmd_$@ := $(make-cmd)' > $(dot-target).cmd +else +cmd_and_savecmd = $(cmd) +endif +ifndef dry_run # Execute the command and also postprocess generated .d dependencies file. if_changed_dep = $(if $(if-changed-cond),$(cmd_and_fixdep),@:) +else +# Just execute the command directly +if_changed_dep = $(cmd) +endif +ifndef dry_run cmd_and_fixdep = \ $(cmd); \ scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\ rm -f $(depfile) +else +cmd_and_fixdep = $(cmd) +endif # Usage: $(call if_changed_rule,foo) # Will check if $(cmd_foo) or any of the prerequisites changed,