p2v: log also environment on conversion server

Save the content of the environment on the conversion server, so it is
one additional help when debugging failed conversions.

p2v/conversion.c

@@ -1060,6 +1060,11 @@ generate_wrapper_script (struct config *config, const char *remote_dir,
   fprintf (fp, "rm -f $log\n");
   fprintf (fp, "\n");
 
+  fprintf (fp,
+           "# Log the environment where virt-v2v will run.\n");
+  fprintf (fp, "printenv > environment\n");
+  fprintf (fp, "\n");
+
   fprintf (fp,
            "# Run virt-v2v.  Send stdout back to virt-p2v.  Send stdout\n"
            "# and stderr (debugging info) to the log file.\n");

p2v/virt-p2v.pod

@@ -662,6 +662,12 @@ The dmesg output from the physical machine.  Useful for detecting
 problems such as missing device drivers or firmware on the virt-p2v
 ISO.
 
+=item F<environment>
+
+I<(before conversion)>
+
+The content of the environment where L<virt-v2v(1)> will run.
+
 =item F<lscpu>
 
 =item F<lspci>