GNU bug report logs - #18370
insert-file-contents: forbids also beg, end for non-regular (special) files

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Package: emacs; Severity: minor; Reported by: Ivan Shmakov <ivan@HIDDEN>; Keywords: moreinfo; Done: Lars Ingebrigtsen <larsi@HIDDEN>; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Juri Linkov <juri@HIDDEN>
Subject: Re: bug#18370: insert-file-contents: forbids also beg, end for
 non-regular (special) files
References: <87y4u4tp5a.fsf@HIDDEN> <874k1w6qlr.fsf@HIDDEN>
 <87r13vqsp0.fsf@HIDDEN> <86pmjeqqx0.fsf@HIDDEN>
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Date: Sun, 12 Jun 2022 12:19:16 +0200
In-Reply-To: <86pmjeqqx0.fsf@HIDDEN> (Juri Linkov's message of "Sun, 
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 Content preview: Juri Linkov <juri@HIDDEN> writes: > Maybe this is related
 to bug#9800, still unfixed after this change. I think it's somewhat unrelated
 -- the /proc files are "regular" files, they just tend to "grow" while reading.
 I think the solution sketched in that bug report sounds OK. 
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Juri Linkov <juri@HIDDEN> writes:

> Maybe this is related to bug#9800, still unfixed after this change.

I think it's somewhat unrelated -- the /proc files are "regular" files,
they just tend to "grow" while reading.  I think the solution sketched
in that bug report sounds OK.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#18370; Package emacs. Full text available.

Message received at 18370 <at> debbugs.gnu.org:


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From: Juri Linkov <juri@HIDDEN>
To: Lars Ingebrigtsen <larsi@HIDDEN>
Subject: Re: bug#18370: insert-file-contents: forbids also beg, end for
 non-regular (special) files
Organization: LINKOV.NET
References: <87y4u4tp5a.fsf@HIDDEN> <874k1w6qlr.fsf@HIDDEN>
 <87r13vqsp0.fsf@HIDDEN>
Date: Sun, 12 Jun 2022 10:11:07 +0300
In-Reply-To: <87r13vqsp0.fsf@HIDDEN> (Lars Ingebrigtsen's message of "Sat,
 11 Jun 2022 14:40:27 +0200")
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>> Simple test case:
>>
>> (insert-file-contents "/dev/urandom" nil nil 10)
>>
>> This still fails in Emacs 29, and it would indeed be nice if it worked.
>> I seem to remember this being discussed previously, and that...  er...
>> no, I can't really recall anything more than that.
>>
>> Does anybody see any good reasons why we shouldn't allow this?  If not,
>> I can take a stab at implementing it...
>
> There were no objections, so I've now added this to Emacs 29.

Maybe this is related to bug#9800, still unfixed after this change.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#18370; Package emacs. Full text available.
bug marked as fixed in version 29.1, send any further explanations to 18370 <at> debbugs.gnu.org and Ivan Shmakov <ivan@HIDDEN> Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Ivan Shmakov <ivan@HIDDEN>
Subject: Re: bug#18370: insert-file-contents: forbids also beg, end for
 non-regular (special) files 
References: <87y4u4tp5a.fsf@HIDDEN> <874k1w6qlr.fsf@HIDDEN>
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Date: Sat, 11 Jun 2022 14:40:27 +0200
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 Content preview: Lars Ingebrigtsen <larsi@HIDDEN> writes: > Simple test
 case:
 > > (insert-file-contents "/dev/urandom" nil nil 10) > > This still fails
 in Emacs 29, and it would indeed be nice if it worked. > I seem to remember
 this being discussed previousl [...] 
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Lars Ingebrigtsen <larsi@HIDDEN> writes:

> Simple test case:
>
> (insert-file-contents "/dev/urandom" nil nil 10)
>
> This still fails in Emacs 29, and it would indeed be nice if it worked.
> I seem to remember this being discussed previously, and that...  er...
> no, I can't really recall anything more than that.
>
> Does anybody see any good reasons why we shouldn't allow this?  If not,
> I can take a stab at implementing it...

There were no objections, so I've now added this to Emacs 29.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#18370; Package emacs. Full text available.
Added tag(s) moreinfo. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Ivan Shmakov <ivan@HIDDEN>
Subject: Re: bug#18370: insert-file-contents: forbids also beg, end for
 non-regular (special) files 
References: <87y4u4tp5a.fsf@HIDDEN>
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 Content preview:  Ivan Shmakov <ivan@HIDDEN> writes: > As currently implemented,
    insert-file-contents disallows not > only (as per (elisp.info) Reading from
    Files) the case of either > ‘visit’ or ‘replace’ arguments being
   non-nil, but also when [...] 
 
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Ivan Shmakov <ivan@HIDDEN> writes:

> 	As currently implemented, insert-file-contents disallows not
> 	only (as per (elisp.info) Reading from Files) the case of either
> 	=E2=80=98visit=E2=80=99 or =E2=80=98replace=E2=80=99 arguments being non=
-nil, but also when
> 	non-nil are either =E2=80=98beg=E2=80=99 or =E2=80=98end=E2=80=99 (or bo=
th):

[...]

> 	This, however, precludes the use of insert-file-contents not
> 	only on named pipes, but also on /dev/cdrom, /dev/random, and
> 	the like, =E2=80=93 for (and especially in the case of the latter) the
> 	=E2=80=98end=E2=80=99 argument gets rather essential here, as otherwise =
the
> 	function is likely to read much more than the caller will be
> 	able to handle at any single time.
>
> 	Instead, I=E2=80=99d suggest that =E2=80=98end=E2=80=99 is always allowe=
d, and =E2=80=98beg=E2=80=99 is
> 	allowed when the file in question is /seekable/, =E2=80=93 which, ISTR,
> 	is possible to check beforehand (lseek (fd, 0, SEEK_CUR) < 0?)
>
> 	From a glance over the code, this new behavior wouldn=E2=80=99t be all
> 	that hard to implement (some not_regular checks will have to be
> 	replaced with the ones against beg_offset, end_offset, etc.),
> 	but from what I read, =E2=80=93 it=E2=80=99s already going to be more th=
an I can
> 	test right now.  So no .diff this time, alas.

(I'm going through old bug reports that unfortunately weren't resolved
at the time.)

Simple test case:

(insert-file-contents "/dev/urandom" nil nil 10)

This still fails in Emacs 29, and it would indeed be nice if it worked.
I seem to remember this being discussed previously, and that...  er...
no, I can't really recall anything more than that.

Does anybody see any good reasons why we shouldn't allow this?  If not,
I can take a stab at implementing it...

--=20
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#18370; Package emacs. Full text available.

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From: Ivan Shmakov <ivan@HIDDEN>
To: submit <at> debbugs.gnu.org
Subject: insert-file-contents: forbids also beg,
 end for non-regular (special) files 
Date: Sun, 31 Aug 2014 19:50:09 +0000
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Package:  emacs
Severity: minor

	As currently implemented, insert-file-contents disallows not
	only (as per (elisp.info) Reading from Files) the case of either
	=E2=80=98visit=E2=80=99 or =E2=80=98replace=E2=80=99 arguments being non-n=
il, but also when
	non-nil are either =E2=80=98beg=E2=80=99 or =E2=80=98end=E2=80=99 (or both=
):

  3506	  /* This code will need to be changed in order to work on named
  3507	     pipes, and it's probably just not worth it.  So we should at
  3508	     least signal an error.  */
  3509	  if (!S_ISREG (st.st_mode))
  3510	    {
  3511	      not_regular =3D 1;
=E2=8B=AF
  3516	      if (! NILP (replace) || ! NILP (beg) || ! NILP (end))
  3517		xsignal2 (Qfile_error,
  3518			  build_string ("not a regular file"), orig_filename);
  3519	    }

	This, however, precludes the use of insert-file-contents not
	only on named pipes, but also on /dev/cdrom, /dev/random, and
	the like, =E2=80=93 for (and especially in the case of the latter) the
	=E2=80=98end=E2=80=99 argument gets rather essential here, as otherwise the
	function is likely to read much more than the caller will be
	able to handle at any single time.

	Instead, I=E2=80=99d suggest that =E2=80=98end=E2=80=99 is always allowed,=
 and =E2=80=98beg=E2=80=99 is
	allowed when the file in question is /seekable/, =E2=80=93 which, ISTR,
	is possible to check beforehand (lseek (fd, 0, SEEK_CUR) < 0?)

	From a glance over the code, this new behavior wouldn=E2=80=99t be all
	that hard to implement (some not_regular checks will have to be
	replaced with the ones against beg_offset, end_offset, etc.),
	but from what I read, =E2=80=93 it=E2=80=99s already going to be more than=
 I can
	test right now.  So no .diff this time, alas.

--=20
FSF associate member #7257  http://boycottsystemd.org/  =E2=80=A6 3013 B6A0=
 230E 334A
Acknowledgement sent to Ivan Shmakov <ivan@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#18370; Package emacs. Full text available.
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