Date: Tue, 22 Sep 2020 15:44:51 -0600 From: Warner Losh <imp@bsdimp.com> To: Kyle Evans <kevans@freebsd.org> Cc: Alan Somers <asomers@freebsd.org>, Mateusz Guzik <mjguzik@gmail.com>, src-committers <src-committers@freebsd.org>, svn-src-all <svn-src-all@freebsd.org>, svn-src-head <svn-src-head@freebsd.org> Subject: Re: svn commit: r365643 - head/bin/cp Message-ID: <CANCZdfrfOrFAkcRWbhQSW9qgyJ6JFyMrgMqrN=YS7eKoT1FmEA@mail.gmail.com> In-Reply-To: <CACNAnaH-L%2Bw=SJW1Cw1M63LQi19d%2Bf_8Sv%2BdYUTyE%2BjYQU6nbA@mail.gmail.com> References: <202009112049.08BKnavL032212@repo.freebsd.org> <CACNAnaGXCt=PezNX-5KU7xTk%2By-um37p8sk1c1KUEc4ywDQ5uQ@mail.gmail.com> <CAOtMX2gtCmyRrhUVia6Arc_PCbgoasG61Xwt=cUaDd1Q1Gtw8g@mail.gmail.com> <CAGudoHEoF3T=hD7-tSNzz0--xKB3LwbjZQH1Xtxujq19hdm2vg@mail.gmail.com> <CAOtMX2i9v73ydzCNz-ZWEZvTot68%2BoT7c0UBE4soOMOcRjBiyA@mail.gmail.com> <CACNAnaGO2FJeKOPXJZ3-etyQf03hvk-kuqj75hKCpg3JQD54=g@mail.gmail.com> <CAOtMX2geGiny1rDMKE7v94R33gb0NcpcJ9k%2B3TrHzsdc5DC8hQ@mail.gmail.com> <CACNAnaGDULoCpp7Rh%2B9mSfC-=uSXiHWOPh9_STpy2yA%2BtSk85A@mail.gmail.com> <CAOtMX2iPqRh6P3JSX3V0erEAzaeN1g4jCAyhTz5O3__ffsBtkA@mail.gmail.com> <CANCZdfqx%2BOboQFZ4xzCeOdNahPkNP3X8yeMD6uVSwHvv2=cinA@mail.gmail.com> <CACNAnaH-L%2Bw=SJW1Cw1M63LQi19d%2Bf_8Sv%2BdYUTyE%2BjYQU6nbA@mail.gmail.com>
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On Tue, Sep 22, 2020 at 3:42 PM Kyle Evans <kevans@freebsd.org> wrote: > cp is already fixed, people are still feeling the fallout of being > within those revisions and needing to bootstrap their own cp. We can > reduce the number of components these invocations rely on trivially to > shell built-in mechanics, why not do so? > Fair point. I just bristle at putting workarounds in for valid /bin/sh syntax because we opposed for a few days. so long as it's an unconditional clearing of the file to be zero length, I'm OK with that. Warner > On Tue, Sep 22, 2020 at 4:40 PM Warner Losh <imp@bsdimp.com> wrote: > > > > So why do we need a workaround at all? cp /dev/null has been fixed, and > that's way more important to get right. > > > > I don't want to paper-over issues with this at all, though if we use the > host's (now broken) cp, I suppose that might be OK in the short term. If > that's the case, then maybe this is OK. > > > > Otherwise, I'd strongly prefer we fix cp. > > > > Warner > > > > On Tue, Sep 22, 2020 at 3:31 PM Alan Somers <asomers@freebsd.org> wrote: > >> > >> +1. > >> > >> On Tue, Sep 22, 2020 at 3:27 PM Kyle Evans <kevans@freebsd.org> wrote: > >>> > >>> I'm running a build at the suggestion of mjg to confirm there aren't > >>> any others hiding that can be converted, and I will commit after I've > >>> verified that this is it. > >>> > >>> On Tue, Sep 22, 2020 at 4:02 PM Alan Somers <asomers@freebsd.org> > wrote: > >>> > > >>> > LGTM. > >>> > > >>> > On Tue, Sep 22, 2020 at 2:59 PM Kyle Evans <kevans@freebsd.org> > wrote: > >>> >> > >>> >> Perhaps: > >>> >> > >>> >> diff --git a/stand/i386/zfsboot/Makefile > b/stand/i386/zfsboot/Makefile > >>> >> index ff315abc0ef..7e362b43a39 100644 > >>> >> --- a/stand/i386/zfsboot/Makefile > >>> >> +++ b/stand/i386/zfsboot/Makefile > >>> >> @@ -81,7 +81,7 @@ zfsboot.ld: zfsboot.ldr zfsboot.bin ${BTXKERN} > >>> >> -o ${.TARGET} -P 1 zfsboot.bin > >>> >> > >>> >> zfsboot.ldr: > >>> >> - cp /dev/null ${.TARGET} > >>> >> + :> ${.TARGET} > >>> >> > >>> >> zfsboot.bin: zfsboot.out > >>> >> ${OBJCOPY} -S -O binary zfsboot.out ${.TARGET} > >>> >> diff --git a/stand/libsa/Makefile b/stand/libsa/Makefile > >>> >> index effece9e01b..63cd46a9c54 100644 > >>> >> --- a/stand/libsa/Makefile > >>> >> +++ b/stand/libsa/Makefile > >>> >> @@ -122,7 +122,7 @@ beforedepend: > >>> >> ln -sf ${SRCTOP}/include/arpa/inet.h arpa/inet.h; \ > >>> >> ln -sf ${SRCTOP}/include/arpa/tftp.h arpa/tftp.h; \ > >>> >> for i in _time.h _strings.h _string.h; do \ > >>> >> - [ -f xlocale/$$i ] || cp /dev/null xlocale/$$i; \ > >>> >> + [ -f xlocale/$$i ] || :> xlocale/$$i; \ > >>> >> done; \ > >>> >> for i in ${STAND_H_INC}; do \ > >>> >> ln -sf ${SASRC}/stand.h $$i; \ > >>> >> > >>> >> > >>> >> On Tue, Sep 22, 2020 at 3:58 PM Alan Somers <asomers@freebsd.org> > wrote: > >>> >> > > >>> >> > Looks like two places in stand. Is there any reason why > Mateusz's suggestion wouldn't work? > >>> >> > > >>> >> > > rg -g Makefile 'cp.*/dev/null' > >>> >> > stand/libsa/Makefile > >>> >> > 125: [ -f xlocale/$$i ] || cp /dev/null xlocale/$$i; \ > >>> >> > > >>> >> > stand/i386/zfsboot/Makefile > >>> >> > 82: cp /dev/null ${.TARGET} > >>> >> > > >>> >> > On Tue, Sep 22, 2020 at 2:54 PM Mateusz Guzik <mjguzik@gmail.com> > wrote: > >>> >> >> > >>> >> >> Can we instead add a workaround to the build tree? > >>> >> >> > >>> >> >> Where is cp /dev/null coming from anyway? Perhaps this can be > patched > >>> >> >> to touch the target file. > >>> >> >> > >>> >> >> On 9/22/20, Alan Somers <asomers@freebsd.org> wrote: > >>> >> >> > On Tue, Sep 22, 2020 at 2:48 PM Kyle Evans <kevans@freebsd.org> > wrote: > >>> >> >> > > >>> >> >> >> On Fri, Sep 11, 2020 at 3:49 PM Alan Somers < > asomers@freebsd.org> wrote: > >>> >> >> >> > > >>> >> >> >> > Author: asomers > >>> >> >> >> > Date: Fri Sep 11 20:49:36 2020 > >>> >> >> >> > New Revision: 365643 > >>> >> >> >> > URL: https://svnweb.freebsd.org/changeset/base/365643 > >>> >> >> >> > > >>> >> >> >> > Log: > >>> >> >> >> > cp: fall back to read/write if copy_file_range fails > >>> >> >> >> > > >>> >> >> >> > Even though copy_file_range has a file-system agnostic > version, it > >>> >> >> >> still > >>> >> >> >> > fails on devfs (perhaps because the file descriptor is > non-seekable?) > >>> >> >> >> In > >>> >> >> >> > that case, fallback to old-fashioned read/write. Fixes > >>> >> >> >> > "cp /dev/null /tmp/null" > >>> >> >> >> > > >>> >> >> >> > >>> >> >> >> Hi, > >>> >> >> >> > >>> >> >> >> Any objection to adding a quick UPDATING entry for this? I'm > seeing > >>> >> >> >> occasional reports of this breakage as recent as today on IRC > from > >>> >> >> >> folks that were a little bit thrown off by this because it > throws up > >>> >> >> >> fairly far into the build and looks like a stand build > regression > >>> >> >> >> instead of a cp regression. > >>> >> >> >> > >>> >> >> >> Thanks, > >>> >> >> >> > >>> >> >> >> Kyle Evans > >>> >> >> >> > >>> >> >> > > >>> >> >> > No objection. Can you suggest the proper wording? > >>> >> >> > _______________________________________________ > >>> >> >> > svn-src-all@freebsd.org mailing list > >>> >> >> > https://lists.freebsd.org/mailman/listinfo/svn-src-all > >>> >> >> > To unsubscribe, send any mail to " > svn-src-all-unsubscribe@freebsd.org" > >>> >> >> > > >>> >> >> > >>> >> >> > >>> >> >> -- > >>> >> >> Mateusz Guzik <mjguzik gmail.com> >
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