prune unreachable code paths

revise man-page discussion of --install-root

doc/prt-get.8

@@ -565,9 +565,18 @@ reading/writing (so <dir>/var/lib/pkg/db must exist), and where the pkg.tar.?z
 archives get unpacked, but the relevant prt-get.conf and ports tree are those 
 on the parent filesystem. Therefore it is not necessary for <dir> to contain 
 its own copy of the ports tree (unless 'runscripts yes' is desired, as
-explained above). However, if <dir>/etc/pkgadd.conf exists and is different
+explained above). But each \fBpkgmk(8)\fP process will take place on the parent
-from /etc/pkgadd.conf, then install or update commands might behave
+filesystem, inspecting \fIthe parent filesystem\fP's environment for
-unexpectedly. In order to preserve the \fBpkgadd.conf(5)\fP settings from the
+information about installed ports and available shared libraries. The
+\fBpkgmk(8)\fP process might therefore draw the wrong conclusions about what
+functionality should be enabled for an installation to <dir>. If the parent
+filesystem is more richly populated than <dir>, with respect to installed
+packages, then the built package might exhibit breakage when \fBpkgadd\fP
+unpacks it into <dir>.
+
+When setting --install-root=<dir>, install or update commands might behave
+unexpectedly if <dir>/etc/pkgadd.conf exists and is different from
+/etc/pkgadd.conf . In order to preserve the \fBpkgadd.conf(5)\fP settings from
 host system, append the option --aargs='-c /etc/pkgadd.conf' to your \fBprt\-get
 install\fP command, or just copy the desired directives into
 <dir>/etc/pkgadd.conf .
@@ -730,15 +739,23 @@ currently-installed ports, but are needed now by the newer versions of
 these ports. The output of this command is sorted by dependencies, therefore
 suitable for piping to \fBxargs prt\-get install\fP.
 
+.TP
+.B prt\-get isinst $(prt\-get quickdep i3) | awk '/not installed/ { print $2 }' | xargs prt\-get depinst \-\-softdeps \-\-test
+(inspired by a troubleshooting session with hestia) Assemble a set of install
+targets needed to build the i3 window manager; sort the list, respecting both
+hard and soft dependencies; then print how the installation would proceed. The
+awk filter in the middle is needed to prevent the command from failing with the
+error message "already installed".
+
 .TP
 .B prt\-get printf \(dq%p\et%u\en\(dq | grep myrepo | cut -f 2
 Print the upstream URL for each port in the collection \(dqmyrepo\(dq, 
 perhaps as the first step in keeping your personal overlay up to date.
 
 .TP
-.B prt\-get printf \(dq%M\et%n\en\(dq | grep ^Tim | wc -l
+.B prt\-get printf \(dq%M\et%n\en\(dq | grep -c -i ^unmaintained
-Count how many ports our most-overworked core team member claims 
+Count how many ports are marked unmaintained (and hence at risk of being dropped
-responsibility for.
+from the repos by the time you next run 'ports -u').
 
 .TP 
 .B comm -13 <(prt\-get depends firefox-bin |tail -n +2 |sort) <(prt\-get depends firefox |tail -n +2 |sort)

src/installtransaction.h

@@ -52,9 +52,7 @@ public:
         SUCCESS,             /*!< yeah, success */
         NO_PACKAGE_GIVEN,    /*!< no package given to install */
         PACKAGE_NOT_FOUND,   /*!< package not found */
-        PKGMK_EXEC_ERROR,    /*!< can't execute pkgmk */
         PKGMK_FAILURE,       /*!< error while pkgmk */
-        PKGADD_EXEC_ERROR,   /*!< can't execute pkgadd */
         PKGDEST_ERROR,       /*!< can't change to PKGDEST */
         PKGADD_FAILURE,      /*!< error while pkgadd */
         CYCLIC_DEPEND,       /*!< cyclic dependencies found */

src/prtget.cpp

@@ -595,21 +595,12 @@ void PrtGet::executeTransaction( InstallTransaction& transaction ) {
 	    case InstallTransaction::PACKAGE_NOT_FOUND:
 	    	cout << m_appName << ": package(s) not found" << endl;
 	    	break;
-	    case InstallTransaction::PKGMK_EXEC_ERROR:
-	    	cout << m_appName << " couldn't excecute pkgmk "
-		    << "(or alternative command). "
-		    << "Make sure it's installed properly" << endl;
-	    	break;
 	    case InstallTransaction::PKGMK_FAILURE:
 	    	cout << m_appName << ": error while building " << endl;
 	    	break;
 	    case InstallTransaction::NO_PACKAGE_GIVEN:
 	    	cout << m_appName << ": no package specified " << endl;
 	    	break;
-	    case InstallTransaction::PKGADD_EXEC_ERROR:
-	    	cout << m_appName << " couldn't excecute pkgadd. "
-	    	<< "Make sure it's installed properly" << endl;
-	    	break;
 	    case InstallTransaction::PKGDEST_ERROR:
 	    	cout << m_appName << ": error changing to PKGDEST directory  "
 	    	<< m_config->packageDir() << endl;