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[gnuastro-commits] master 683bc57 5/5: Book: known issue in ImageMagick

From: Mohammad Akhlaghi
Subject: [gnuastro-commits] master 683bc57 5/5: Book: known issue in ImageMagick mentioned in bootstrapping section
Date: Sat, 12 Jun 2021 16:24:56 -0400 (EDT)

branch: master
commit 683bc572db6fb469caf1b92c6b2dfa7891a18916
Author: Mohammad Akhlaghi <>
Commit: Mohammad Akhlaghi <>

    Book: known issue in ImageMagick mentioned in bootstrapping section
    Until now, the issue with ImageMagick (which only occurs during
    bootstrapping Gnuastro) was only mentioned in the "Known issues"
    section. Since people will only confront this when bootstrapping, it is
    good to remind them that "Known issues" contains such problems also.
    With this commit, "Known issues" has been mentioned in the bootstrapping
    section (at the start, after saying that the standard GNU Build system may
    be used after bootstrapping and that known problems are mentioned there).
    Furthermore, this error will occur during the 'make' phase, not 'make
    check'. So it has been corrected and since it only happens during
    bootstrapping, a "(while bootstrapping)" has been added after the item.
 doc/gnuastro.texi | 39 +++++++++++++++++++++++++--------------
 1 file changed, 25 insertions(+), 14 deletions(-)

diff --git a/doc/gnuastro.texi b/doc/gnuastro.texi
index a896cbf..86fc00a 100644
--- a/doc/gnuastro.texi
+++ b/doc/gnuastro.texi
@@ -5792,6 +5792,9 @@ These automatically generated files are included in the 
distributed tar ball for
 However from the perspective of version control, they are just bloatware and 
sources of confusion (since they are not changed by Gnuastro developers).
 The process of automatically building and importing necessary files into the 
cloned directory is known as @emph{bootstrapping}.
+After bootstrapping is done you are ready to follow the default GNU build 
steps that you normally run on the tarball (@command{./configure && make} for 
example, described more in @ref{Quick start}).
+Some known issues with bootstrapping may occur during the process, to see how 
to fix them, please see @ref{Known issues}.
 All the instructions for an automatic bootstrapping are available in 
@file{bootstrap} and configured using @file{bootstrap.conf}.
 @file{bootstrap} and @file{COPYING} (which contains the software copyright 
notice) are the only files not written by Gnuastro developers but under version 
control to enable simple bootstrapping and legal information on usage 
immediately after cloning.
 @file{bootstrap.conf} is maintained by the GNU Portability Library (Gnulib) 
and this file is an identical copy, so do not make any changes in this file 
since it will be replaced when Gnulib releases an update.
@@ -5824,7 +5827,6 @@ $ cd $TOPGNUASTRO/gnuastro
 $ ./bootstrap --copy --gnulib-srcdir=$DEVDIR/gnulib
 @end example
 @cindex GNU Texinfo
 @cindex GNU Libtool
 @cindex GNU Autoconf
@@ -6753,19 +6755,6 @@ export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/usr/local/lib"
 You can also add more directories by using a colon `@code{:}' to separate them.
 See @ref{Installation directory} and @ref{Linking} to learn more on the 
@code{PATH} variables and dynamic linking respectively.
-@cindex Tests, error in converting images
-@command{$ make check}: @emph{There is an error with converting images} The 
error might be as follows:
-@code{convert: attempt to perform an operation not allowed by the security 
policy `gs' @ error/delegate.c/ExternalDelegateCommand/378.}
-This error is a known 
issue@footnote{@url{}} with 
@code{ImageMagick} security policies, which states:
-@code{imagemagick} uses Ghostscript for PDF, EPS, PS and XPS parsing.
-Because there have been multiple vulnerabilities with 
it is compiled without Ghostscript library.
-It would fall back to gs command instead, but that is, by default, disabled in 
@code{/etc/ImageMagick-7/policy.xml} with the following line:
-<policy domain="delegate" rights="none" pattern="gs" />
-@end example
 @cindex GPL Ghostscript
 @command{$ make check}: @emph{The tests relying on external programs (for 
example @file{} fail.)} This is probably due to the fact that the 
version number of the external programs is too old for the tests we have 
@@ -6788,6 +6777,28 @@ Therefore, to run successfully before and after 
installation, linking modificati
 @command{make install} does this internally, but a simple copy might give 
linking errors when you run it.
 If you need to copy the executables, you can do so after installation.
+@cindex Tests, error in converting images
+@command{$ make} (when bootstrapping): After you have bootstrapped Gnuastro 
from the version-controlled source, you may confront the following (or a 
similar) error when converting images (for more on bootrapping, see 
+@code{convert: attempt to perform an operation not allowed by the
+security policy `gs' @ error/delegate.c/ExternalDelegateCommand/378.}
+@end example
+This error is a known 
issue@footnote{@url{}} with 
@code{ImageMagick} security policies in some operating systems.
+In short, @code{imagemagick} uses Ghostscript for PDF, EPS, PS and XPS parsing.
+However, because some security vulnerabilities have been found in 
by default, ImageMagick may be compiled without Ghostscript library.
+In such cases, if allowed, ImageMagick will fall back to the external 
@command{gs} command instead of the library.
+But this may be disabled with the following (or a similar) lines in 
@code{/etc/ImageMagick-7/policy.xml} (anything related to PDF, PS, or 
+<policy domain="delegate" rights="none" pattern="gs" />
+<policy domain="module" rights="none" pattern="@{PS,PDF,XPS@}" />
+@end example
+To fix this problem, simply comment such lines (by placing a @code{<!--} 
before each statement/line and @code{-->} at the end of that statement/line).
 @end itemize

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