Print a warning when using obsolete --print-installation-architecture

Packages should be switched to use --print-architecture. This option
will be removed sometime in the future.

Closes: #528171

README.feature-removal-schedule

@@ -85,6 +85,14 @@ Why:
  signatures for several years already. Supporting only GnuPG enables us to
  rely on some of its features.
 
+What: --print-installation-architecture (dpkg option)
+Status: obsolete
+When: 1.15.x
+Warning: program
+Why:
+ Obsoleted long time ago (2005-01-22). Remaining packages should switch to
+ use 'dpkg --print-architecture'.
+
 History of feature removals
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

debian/changelog

@@ -104,6 +104,8 @@ dpkg (1.15.1) UNRELEASED; urgency=low
   * Only print fatal errno string in start-stop-daemon if it was non-zero.
   * Print the valid values for the IO scheduler class in start-stop-daemon
     --help output.
+  * Print a warning when using obsolete '--print-installation-architecture'.
+    Closes: #528171
 
   [ Frank Lichtenheld ]
   * Dpkg::Version: Remove unnecessary function next_elem which just

src/enquiry.c

@@ -387,6 +387,14 @@ void printarch(const char *const *argv) {
   if (fflush(stdout)) werr("stdout");
 }
 
+void
+printinstarch(const char *const *argv)
+{
+  warning(_("obsolete option '--%s', please use '--%s' instead."),
+          "print-installation-architecture", "print-architecture");
+  printarch(argv);
+}
+
 void cmpversions(const char *const *argv) {
   struct relationinfo {
     const char *string;

src/main.c

@@ -423,7 +423,7 @@ static const struct cmdinfo cmdinfos[]= {
   ACTION( "assert-long-filenames",           0,  act_assertlongfilenames,  assertlongfilenames ),
   ACTION( "assert-multi-conrep",             0,  act_assertmulticonrep,    assertmulticonrep ),
   ACTION( "print-architecture",              0,  act_printarch,            printarch   ),
-  ACTION( "print-installation-architecture", 0,  act_printinstarch,        printarch   ),
+  ACTION( "print-installation-architecture", 0,  act_printinstarch,        printinstarch  ),
   ACTION( "predep-package",                  0,  act_predeppackage,        predeppackage   ),
   ACTION( "compare-versions",                0,  act_cmpversions,          cmpversions     ),
 /*