GNU bug report logs - #58367
`package-install-file' rejects some .tar files (tentative patch)

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Package: emacs; Reported by: Richard Hopkins <emacs@HIDDEN>; Keywords: patch; dated Fri, 7 Oct 2022 21:17:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Date: Sat, 08 Oct 2022 14:55:35 +0100
From: Richard Hopkins <emacs@HIDDEN>
To: Lars Ingebrigtsen <larsi@HIDDEN>
Subject: Re: bug#58367: `package-install-file' rejects some .tar files
 (tentative patch)
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 <87pmf2saur.fsf@HIDDEN>
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Cc: 58367 <at> debbugs.gnu.org, Stefan Monnier <monnier@HIDDEN>
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I've found another difference regarding `package-install-file' and a
package with subdirectories that I can reproduce with the previously
attached files.  This is the difference between installing a directory
or installing a .tar file.  For example

M-: (package-install-file "ustar-withsub-0.1")
;; * installs but ignores subdirectory

M-: (package-install-file "ustar-withsub-0.1.tar")
;; * 28.2 - error
;; * with patch - installs and includes subdirectory

I believe sub directories should be allowed from this part of the docs
and the patch now allows for it as well as fixing the error.

     "...Files may also extract into subdirectories of the content
     directory. ..."
     
https://www.gnu.org/software/emacs/manual/html_node/elisp/Multi_002dfile-Packages.html

It would be to good to see if anyone can reproduce these as it looks
like more patches are needed to support sub directories?

1) for v7-withsub-0.1.tar so it looks at the top level for "-pkg.el"

2) include subdirectories when installing from a directory to match
functionality of installing from .tar.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#58367; Package emacs. Full text available.

Message received at 58367 <at> debbugs.gnu.org:


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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Richard Hopkins <emacs@HIDDEN>
Subject: Re: bug#58367: `package-install-file' rejects some .tar files
 (tentative patch)
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 Content preview: Richard Hopkins <emacs@HIDDEN> writes: >
 `package-install-file'
 signals an error for some .tar packages based > on their structure - both
 file layout and tar format. > > This is specific to the package routines
 for .tar files as Emacs can [...] 
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Richard Hopkins <emacs@HIDDEN> writes:

> `package-install-file' signals an error for some .tar packages based
> on their structure - both file layout and tar format.
>
> This is specific to the package routines for .tar files as Emacs can
> understand them fine, and can also install the packages if they have
> already been extracted.

Perhaps Stefan has some comments here; added to the CCs.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#58367; Package emacs. Full text available.
Added tag(s) patch. Request was from Stefan Kangas <stefankangas@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Subject: `package-install-file' rejects some .tar files (tentative patch)
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`package-install-file' signals an error for some .tar packages based
on their structure - both file layout and tar format.

This is specific to the package routines for .tar files as Emacs can
understand them fine, and can also install the packages if they have
already been extracted.

There's 2 different issues that cause this:

1) An old style .tar file (autoconf tar-v7, `tar cof ...`) vs a new
style file (autoconf tar-ustar, `tar cf ...`)

2) A package where all files are in a single directory vs having
child directories.  A package with child directories currently only
installs successfully if it's already extracted; the manual also says
they are allowed.

Combining these issues the current state of package installation using
.tar files is:

* ustar-nosub - error
* ustar-withsub - error
* v7-nosub - success
* v7-withsub - error

The main issue is how the package functions try to calculate the root
of the package directory and from there it can locate the "-pkg.el"
file etc.  From this we get two different errors:

1) Cannot handle a plain directory being first and missing a path
separator.  e.g. This happens for ustar files with or without a sub
directory.

$ tar tf ustar-nosub-0.1.tar
ustar-nosub-0.1
ustar-nosub-0.1/ustar-nosub.el
ustar-nosub-0.1/ustar-nosub-pkg.el

M-: (package-install-file "ustar-nosub-0.1.tar")
Debugger entered--Lisp error: (wrong-type-argument stringp nil)
   directory-file-name(nil)
   package--description-file(nil)
   package-tar-file-info()
   package-install-from-buffer()
   package-install-file("~/tmp/pkgtest/tars/ustar-nosub-0.1.tar")
   funcall-interactively(package-install-file 
"~/tmp/pkgtest/tars/ustar-nosub-0.1.tar")
   call-interactively(package-install-file record nil)
   command-execute(package-install-file record)
   execute-extended-command(nil "package-install-file" 
"package-install-file")
   funcall-interactively(execute-extended-command nil 
"package-install-file" "package-install-file")
   call-interactively(execute-extended-command nil nil)
   command-execute(execute-extended-command)

2) Looks for "-pkg.el" in a sub directory when it won't be there.
This happens for a v7 file but may also happen for a ustar if it
wasn't for error (1).

$ tar tf v7-withsub-0.1.tar
v7-withsub-0.1/v7-sub/foo.txt
v7-withsub-0.1/v7-withsub.el
v7-withsub-0.1/v7-withsub-pkg.el

M-: (package-install-file "tar tf v7-withsub-0.1.tar")
Debugger entered--Lisp error: (wrong-type-argument arrayp nil)
   tar--describe-as-link(nil)
   tar--check-descriptor(nil)
   tar-get-file-descriptor("v7-withsub-0.1/v7-sub/v7-sub-pkg.el")
   package-tar-file-info()
   package-install-from-buffer()
   package-install-file("~/tmp/pkgtest/tars/v7-withsub-0.1.tar")
   funcall-interactively(package-install-file 
"~/tmp/pkgtest/tars/v7-withsub-0.1.tar")
   call-interactively(package-install-file record nil)
   command-execute(package-install-file record)
   execute-extended-command(nil "package-install-file" 
"package-install-file")
   funcall-interactively(execute-extended-command nil 
"package-install-file" "package-install-file")
   call-interactively(execute-extended-command nil nil)
   command-execute(execute-extended-command)

For comparison the only .tar file that works is an old style v7 file
with all files in a single directory

$ tar tf v7-nosub-0.1.tar
v7-nosub-0.1/v7-nosub.el
v7-nosub-0.1/v7-nosub-pkg.el

M-: (package-install-file "v7-nosub-0.1.tar")
success

I've attached the example files to help you investigate.

There is also a proof of concept patch as it fixes ustar files with or
without sub directories, but it still fails on v7-withsub making the
new summary:

* ustar-nosub - success
* ustar-withsub - success
* v7-nosub - success
* v7-withsub - error

The modified functions were `package-untar-buffer' and
`package-tar-file-info'.

p.s. These results are from OpenBSD 7.1 with their `tar` and
Emacs 28.2 and master.

A related issue #13136 - 
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=13136
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Acknowledgement sent to Richard Hopkins <emacs@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#58367; Package emacs. Full text available.
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