busybox: Save shell history into /tmp

Enable the busybox feature to save shell command history.
(.apk size increase 0.5 kB)

To prevent flash wear,
* save history only at the exit from a shell session, and
* set /tmp as the default location for the history file. The history
  is kept on ramdisk until a reboot, when the history is then lost.

If the user wants to save history onto flash, he can change the location
definition in /etc/profile.d/busybox-history-file.sh

Signed-off-by: Hannu Nyman <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/17179
Signed-off-by: Hauke Mehrtens <[email protected]>

package/utils/busybox/Config-defaults.in

@@ -255,10 +255,10 @@ config BUSYBOX_DEFAULT_FEATURE_EDITING_HISTORY
 	default 256
 config BUSYBOX_DEFAULT_FEATURE_EDITING_SAVEHISTORY
 	bool
-	default n
+	default y
 config BUSYBOX_DEFAULT_FEATURE_EDITING_SAVE_ON_EXIT
 	bool
-	default n
+	default y
 config BUSYBOX_DEFAULT_FEATURE_REVERSE_SEARCH
 	bool
 	default n

package/utils/busybox/Makefile

@@ -6,7 +6,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=busybox
 PKG_VERSION:=1.37.0
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 PKG_FLAGS:=essential
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
@@ -143,6 +143,8 @@ define Package/busybox/install
 	$(INSTALL_DIR) $(1)/etc/init.d
 	$(INSTALL_DIR) $(1)/usr/sbin
 	$(CP) $(PKG_INSTALL_DIR)/* $(1)/
+	$(INSTALL_DIR) $(1)/etc/profile.d
+	$(INSTALL_BIN) ./files/busybox-history-file.sh $(1)/etc/profile.d
 ifneq ($(CONFIG_BUSYBOX_$(BUSYBOX_SYM)_FEATURE_SYSLOG)$(CONFIG_BUSYBOX_$(BUSYBOX_SYM)_FEATURE_SYSLOGD_CFG),)
 	touch $(1)/etc/syslog.conf
 endif

package/utils/busybox/files/busybox-history-file.sh

@@ -0,0 +1,2 @@
+export HISTFILE=/tmp/.busybox_ash_history
+