* [PATCH] kbuild: set EXIT trap before creating temporary directory
@ 2022-07-28 3:14 Masahiro Yamada
2022-08-02 17:52 ` Nick Desaulniers
2022-08-04 16:12 ` Nicolas Schier
0 siblings, 2 replies; 4+ messages in thread
From: Masahiro Yamada @ 2022-07-28 3:14 UTC (permalink / raw)
To: linux-kbuild
Cc: David Laight, Masahiro Yamada, Michal Marek, Nick Desaulniers,
linux-kernel
Swap the order of 'mkdir' and 'trap' just in case the subshell is
interrupted between 'mkdir' and 'trap' although the effect might be
subtle.
Please not this is not a perfect solution to avoid the left-over tmp
directory. There are more cases that miss to remove the tmp directory,
for example:
- When interrupted, dash does not invoke the EXIT trap (bash does)
- 'rm' command might be interrupted before removing the directory
I am not addressing all the cases since the tmp directory is harmless
after all.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---
scripts/Kconfig.include | 2 +-
scripts/Makefile.compiler | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
index c1f4222d223d..a0ccceb22cf8 100644
--- a/scripts/Kconfig.include
+++ b/scripts/Kconfig.include
@@ -25,7 +25,7 @@ failure = $(if-success,$(1),n,y)
# $(cc-option,<flag>)
# Return y if the compiler supports <flag>, n otherwise
-cc-option = $(success,mkdir .tmp_$$; trap "rm -rf .tmp_$$" EXIT; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$/tmp.o)
+cc-option = $(success,trap "rm -rf .tmp_$$" EXIT; mkdir .tmp_$$; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$/tmp.o)
# $(ld-option,<flag>)
# Return y if the linker supports <flag>, n otherwise
diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler
index 86ecd2ac874c..94d0d40cddb3 100644
--- a/scripts/Makefile.compiler
+++ b/scripts/Makefile.compiler
@@ -21,8 +21,8 @@ TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$
# automatically cleaned up.
try-run = $(shell set -e; \
TMP=$(TMPOUT)/tmp; \
- mkdir -p $(TMPOUT); \
trap "rm -rf $(TMPOUT)" EXIT; \
+ mkdir -p $(TMPOUT); \
if ($(1)) >/dev/null 2>&1; \
then echo "$(2)"; \
else echo "$(3)"; \
--
2.34.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] kbuild: set EXIT trap before creating temporary directory
2022-07-28 3:14 [PATCH] kbuild: set EXIT trap before creating temporary directory Masahiro Yamada
@ 2022-08-02 17:52 ` Nick Desaulniers
2022-08-04 16:12 ` Nicolas Schier
1 sibling, 0 replies; 4+ messages in thread
From: Nick Desaulniers @ 2022-08-02 17:52 UTC (permalink / raw)
To: Masahiro Yamada; +Cc: linux-kbuild, David Laight, Michal Marek, linux-kernel
On Wed, Jul 27, 2022 at 8:17 PM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> Swap the order of 'mkdir' and 'trap' just in case the subshell is
> interrupted between 'mkdir' and 'trap' although the effect might be
> subtle.
>
> Please not this is not a perfect solution to avoid the left-over tmp
> directory. There are more cases that miss to remove the tmp directory,
> for example:
>
> - When interrupted, dash does not invoke the EXIT trap (bash does)
>
> - 'rm' command might be interrupted before removing the directory
>
> I am not addressing all the cases since the tmp directory is harmless
> after all.
>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Thanks for the patch!
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
> ---
>
> scripts/Kconfig.include | 2 +-
> scripts/Makefile.compiler | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
> index c1f4222d223d..a0ccceb22cf8 100644
> --- a/scripts/Kconfig.include
> +++ b/scripts/Kconfig.include
> @@ -25,7 +25,7 @@ failure = $(if-success,$(1),n,y)
>
> # $(cc-option,<flag>)
> # Return y if the compiler supports <flag>, n otherwise
> -cc-option = $(success,mkdir .tmp_$$; trap "rm -rf .tmp_$$" EXIT; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$/tmp.o)
> +cc-option = $(success,trap "rm -rf .tmp_$$" EXIT; mkdir .tmp_$$; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$/tmp.o)
>
> # $(ld-option,<flag>)
> # Return y if the linker supports <flag>, n otherwise
> diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler
> index 86ecd2ac874c..94d0d40cddb3 100644
> --- a/scripts/Makefile.compiler
> +++ b/scripts/Makefile.compiler
> @@ -21,8 +21,8 @@ TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$
> # automatically cleaned up.
> try-run = $(shell set -e; \
> TMP=$(TMPOUT)/tmp; \
> - mkdir -p $(TMPOUT); \
> trap "rm -rf $(TMPOUT)" EXIT; \
> + mkdir -p $(TMPOUT); \
> if ($(1)) >/dev/null 2>&1; \
> then echo "$(2)"; \
> else echo "$(3)"; \
> --
> 2.34.1
>
--
Thanks,
~Nick Desaulniers
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] kbuild: set EXIT trap before creating temporary directory
2022-07-28 3:14 [PATCH] kbuild: set EXIT trap before creating temporary directory Masahiro Yamada
2022-08-02 17:52 ` Nick Desaulniers
@ 2022-08-04 16:12 ` Nicolas Schier
2022-08-07 1:16 ` Masahiro Yamada
1 sibling, 1 reply; 4+ messages in thread
From: Nicolas Schier @ 2022-08-04 16:12 UTC (permalink / raw)
To: Masahiro Yamada
Cc: linux-kbuild, David Laight, Michal Marek, Nick Desaulniers, linux-kernel
On Thu, Jul 28, 2022 at 12:14:33PM +0900, Masahiro Yamada wrote:
> Swap the order of 'mkdir' and 'trap' just in case the subshell is
> interrupted between 'mkdir' and 'trap' although the effect might be
> subtle.
>
> Please not this is not a perfect solution to avoid the left-over tmp
not -> note?
> directory. There are more cases that miss to remove the tmp directory,
> for example:
>
> - When interrupted, dash does not invoke the EXIT trap (bash does)
>
> - 'rm' command might be interrupted before removing the directory
>
> I am not addressing all the cases since the tmp directory is harmless
> after all.
>
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> ---
>
> scripts/Kconfig.include | 2 +-
> scripts/Makefile.compiler | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
Do you want to add the same for filechk macro in scripts/Kbuild.include?
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Kind regards,
Nicolas
>
> diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
> index c1f4222d223d..a0ccceb22cf8 100644
> --- a/scripts/Kconfig.include
> +++ b/scripts/Kconfig.include
> @@ -25,7 +25,7 @@ failure = $(if-success,$(1),n,y)
>
> # $(cc-option,<flag>)
> # Return y if the compiler supports <flag>, n otherwise
> -cc-option = $(success,mkdir .tmp_$$; trap "rm -rf .tmp_$$" EXIT; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$/tmp.o)
> +cc-option = $(success,trap "rm -rf .tmp_$$" EXIT; mkdir .tmp_$$; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$/tmp.o)
>
> # $(ld-option,<flag>)
> # Return y if the linker supports <flag>, n otherwise
> diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler
> index 86ecd2ac874c..94d0d40cddb3 100644
> --- a/scripts/Makefile.compiler
> +++ b/scripts/Makefile.compiler
> @@ -21,8 +21,8 @@ TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$
> # automatically cleaned up.
> try-run = $(shell set -e; \
> TMP=$(TMPOUT)/tmp; \
> - mkdir -p $(TMPOUT); \
> trap "rm -rf $(TMPOUT)" EXIT; \
> + mkdir -p $(TMPOUT); \
> if ($(1)) >/dev/null 2>&1; \
> then echo "$(2)"; \
> else echo "$(3)"; \
> --
> 2.34.1
--
epost|xmpp: nicolas@fjasle.eu irc://oftc.net/nsc
↳ gpg: 18ed 52db e34f 860e e9fb c82b 7d97 0932 55a0 ce7f
-- frykten for herren er opphav til kunnskap --
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] kbuild: set EXIT trap before creating temporary directory
2022-08-04 16:12 ` Nicolas Schier
@ 2022-08-07 1:16 ` Masahiro Yamada
0 siblings, 0 replies; 4+ messages in thread
From: Masahiro Yamada @ 2022-08-07 1:16 UTC (permalink / raw)
To: Nicolas Schier
Cc: Linux Kbuild mailing list, David Laight, Michal Marek,
Nick Desaulniers, Linux Kernel Mailing List
On Fri, Aug 5, 2022 at 1:13 AM Nicolas Schier <nicolas@fjasle.eu> wrote:
>
> On Thu, Jul 28, 2022 at 12:14:33PM +0900, Masahiro Yamada wrote:
> > Swap the order of 'mkdir' and 'trap' just in case the subshell is
> > interrupted between 'mkdir' and 'trap' although the effect might be
> > subtle.
> >
> > Please not this is not a perfect solution to avoid the left-over tmp
>
> not -> note?
Right.
It is a typo.
>
> > directory. There are more cases that miss to remove the tmp directory,
> > for example:
> >
> > - When interrupted, dash does not invoke the EXIT trap (bash does)
> >
> > - 'rm' command might be interrupted before removing the directory
> >
> > I am not addressing all the cases since the tmp directory is harmless
> > after all.
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> > ---
> >
> > scripts/Kconfig.include | 2 +-
> > scripts/Makefile.compiler | 2 +-
> > 2 files changed, 2 insertions(+), 2 deletions(-)
>
> Do you want to add the same for filechk macro in scripts/Kbuild.include?
No, I do not think so.
In filechk
mkdir -p $(dir $@);
this is a directory for the target.
So, the trap does not delete it.
Otherwise, all call-sites must create the directory manually.
$(timeconst-file): kernel/time/timeconst.bc FORCE
@mkdir -p $(dir $@)
$(call filechk,gentimeconst)
> Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
>
> Kind regards,
> Nicolas
>
> >
> > diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
> > index c1f4222d223d..a0ccceb22cf8 100644
> > --- a/scripts/Kconfig.include
> > +++ b/scripts/Kconfig.include
> > @@ -25,7 +25,7 @@ failure = $(if-success,$(1),n,y)
> >
> > # $(cc-option,<flag>)
> > # Return y if the compiler supports <flag>, n otherwise
> > -cc-option = $(success,mkdir .tmp_$$; trap "rm -rf .tmp_$$" EXIT; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$/tmp.o)
> > +cc-option = $(success,trap "rm -rf .tmp_$$" EXIT; mkdir .tmp_$$; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$/tmp.o)
> >
> > # $(ld-option,<flag>)
> > # Return y if the linker supports <flag>, n otherwise
> > diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler
> > index 86ecd2ac874c..94d0d40cddb3 100644
> > --- a/scripts/Makefile.compiler
> > +++ b/scripts/Makefile.compiler
> > @@ -21,8 +21,8 @@ TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$
> > # automatically cleaned up.
> > try-run = $(shell set -e; \
> > TMP=$(TMPOUT)/tmp; \
> > - mkdir -p $(TMPOUT); \
> > trap "rm -rf $(TMPOUT)" EXIT; \
> > + mkdir -p $(TMPOUT); \
> > if ($(1)) >/dev/null 2>&1; \
> > then echo "$(2)"; \
> > else echo "$(3)"; \
> > --
> > 2.34.1
>
> --
> epost|xmpp: nicolas@fjasle.eu irc://oftc.net/nsc
> ↳ gpg: 18ed 52db e34f 860e e9fb c82b 7d97 0932 55a0 ce7f
> -- frykten for herren er opphav til kunnskap --
--
Best Regards
Masahiro Yamada
^ permalink raw reply [flat|nested] 4+ messages in thread
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2022-07-28 3:14 [PATCH] kbuild: set EXIT trap before creating temporary directory Masahiro Yamada
2022-08-02 17:52 ` Nick Desaulniers
2022-08-04 16:12 ` Nicolas Schier
2022-08-07 1:16 ` Masahiro Yamada
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