shell: fix script's comm field if ENABLE_FEATURE_PREFER_APPLETS=y

function                                             old     new   delta
re_execed_comm                                         -      46     +46
main                                                  72      86     +14
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/0 up/down: 60/0)               Total: 60 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/ash_test/ash-comm/comm.right

@@ -0,0 +1,6 @@
+./SCRIPT.sh:
+  /proc/N/comm: SCRIPT.sh
+exec ./SCRIPT.sh:
+  /proc/N/comm: SCRIPT.sh
+sh ./SCRIPT.sh:
+  /proc/N/comm: ash

shell/ash_test/ash-comm/comm.tests

@@ -0,0 +1,20 @@
+{
+echo "#!$THIS_SH"
+echo 'procdir=/proc/$$'
+#echo 'echo "  /proc/N/exe:  $(basename $(readlink $procdir/exe))"'
+echo 'echo "  /proc/N/comm: $(cat $procdir/comm)"'
+} >SCRIPT.sh
+chmod 755 SCRIPT.sh
+
+# comm field was wrong if CONFIG_FEATURE_PREFER_APPLETS=y
+echo './SCRIPT.sh:'
+./SCRIPT.sh
+
+# comm field was wrong if CONFIG_FEATURE_PREFER_APPLETS=y
+echo 'exec ./SCRIPT.sh:'
+(exec ./SCRIPT.sh)
+
+echo 'sh ./SCRIPT.sh:'
+$THIS_SH ./SCRIPT.sh
+
+rm SCRIPT.sh

shell/hush_test/hush-comm/comm.right

@@ -0,0 +1,6 @@
+./SCRIPT.sh:
+  /proc/N/comm: SCRIPT.sh
+exec ./SCRIPT.sh:
+  /proc/N/comm: SCRIPT.sh
+sh ./SCRIPT.sh:
+  /proc/N/comm: hush

shell/hush_test/hush-comm/comm.tests

@@ -0,0 +1,20 @@
+{
+echo "#!$THIS_SH"
+echo 'procdir=/proc/$$'
+#echo 'echo "  /proc/N/exe:  $(basename $(readlink $procdir/exe))"'
+echo 'echo "  /proc/N/comm: $(cat $procdir/comm)"'
+} >SCRIPT.sh
+chmod 755 SCRIPT.sh
+
+# comm field was wrong if CONFIG_FEATURE_PREFER_APPLETS=y
+echo './SCRIPT.sh:'
+./SCRIPT.sh
+
+# comm field was wrong if CONFIG_FEATURE_PREFER_APPLETS=y
+echo 'exec ./SCRIPT.sh:'
+(exec ./SCRIPT.sh)
+
+echo 'sh ./SCRIPT.sh:'
+$THIS_SH ./SCRIPT.sh
+
+rm SCRIPT.sh