[MacPorts] #45354: gdk-pixbuf2 @2.31.1 Hidden dependency on shared-mime-info

[MacPorts]

#45354: gdk-pixbuf2 @2.31.1 Hidden dependency on shared-mime-info
--------------------------+----------------------
  Reporter:  bgilbert@…   |      Owner:  devans@…
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  gdk-pixbuf2  |
--------------------------+----------------------

Comment (by bgilbert@…):

 It turns out that `shared-mime-info` doesn't delete its cache files when
 it is uninstalled (filed as #45396), so removing it is not enough to get
 your system back to a pristine state.  That explains why GIO content
 sniffing is enabled during gdk-pixbuf builds: the builders have had
 `shared-mime-info` installed ''at some point in the past''.

 Here's a session demonstrating the problem:

 {{{
 $ port installed gdk-pixbuf2 shared-mime-info
 The following ports are currently installed:
   gdk-pixbuf2 @2.31.1_0+x11 (active)
   shared-mime-info @1.3_0 (active)
 $ wget -q https://www.macports.org/img/macports-logo-top.png
 $ cat gdk-pixbuf-open.c
 #include <stdio.h>
 #include <gdk-pixbuf/gdk-pixbuf.h>

 int main(int argc, char **argv) {
     GError *err = NULL;
     GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(argv[1], &err);
     if (pixbuf == NULL) {
         fprintf(stderr, "Failed: %s\n", err->message);
     } else {
         printf("OK\n");
     }
     return 0;
 }
 $ gcc -o gdk-pixbuf-open $(pkg-config --cflags --libs glib-2.0 gdk-
 pixbuf-2.0) gdk-pixbuf-open.c
 $ ./gdk-pixbuf-open macports-logo-top.png
 OK
 $ sudo port uninstall shared-mime-info
 --->  Deactivating shared-mime-info @1.3_0
 --->  Cleaning shared-mime-info
 --->  Uninstalling shared-mime-info @1.3_0
 --->  Cleaning shared-mime-info
 $ ./gdk-pixbuf-open macports-logo-top.png
 OK
 $ ls -d /opt/local/share/mime/* | grep -v packages | sudo xargs rm -r
 $ ./gdk-pixbuf-open macports-logo-top.png
 Failed: Couldn't recognize the image file format for file 'macports-logo-
 top.png'
 $ sudo port install shared-mime-info
 --->  Computing dependencies for shared-mime-info
 --->  Fetching archive for shared-mime-info
 --->  Attempting to fetch shared-mime-info-1.3_0.darwin_13.x86_64.tbz2
 from http://packages.macports.org/shared-mime-info
 --->  Attempting to fetch shared-mime-
 info-1.3_0.darwin_13.x86_64.tbz2.rmd160 from http://packages.macports.org
 /shared-mime-info
 --->  Installing shared-mime-info @1.3_0
 --->  Activating shared-mime-info @1.3_0
 --->  Cleaning shared-mime-info
 --->  Updating database of binaries
 --->  Scanning binaries for linking errors
 --->  No broken files found.
 $ ./gdk-pixbuf-open macports-logo-top.png
 OK
 }}}

 To summarize: GIO content sniffing is implicitly enabled in `gdk-pixbuf2`
 builds due to #45396, but doesn't actually return a useful result unless
 `shared-mime-info` (or its leftover cache files) is installed.  Neither
 the `gdk-pixbuf2` nor `glib2` packages depend on `shared-mime-info`.  As a
 result, a minimal install of `gdk-pixbuf2` refuses to load any images.

-- 
Ticket URL: <https://trac.macports.org/ticket/45354#comment:5>
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