As package size changes are a continuous topic on the mailing list this
scripts helps developers to compare their local package modifications
against latest upstream.
The script downloads the latest package indexes based on env variables
or the `.config` file. The script compares the actual installed size
(data.tar.gz) or the IPK package size.
An example output is found below:
```
user@dawn:~/src/openwrt/openwrt$ ./scripts/size_compare.sh
Compare packages of ath79/tiny/mips_24kc:
dropbear busybox iw ubus
Checking configuration difference
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 554 100 554 0 0 336 0 0:00:01 0:00:01 --:--:-- 336
--- start config diff ---
--- /tmp/config.DDjwVh-LOCAL 2020-11-23 09:08:28.913203068 -1000
+++ /tmp/config.DDjwVh-UPSTREAM 2020-11-23 09:08:36.369240887 -1000
@@ -1,5 +1,9 @@
+CONFIG_ALL_KMODS=y
+CONFIG_ALL_NONSHARED=y
CONFIG_AUTOREBUILD=y
+CONFIG_AUTOREMOVE=y
--- 8< ---
CONFIG_BINARY_FOLDER=""
+CONFIG_BUILDBOT=y
+CONFIG_TARGET_ALL_PROFILES=y
CONFIG_TARGET_ROOTFS_DIR=""
CONFIG_USE_SSTRIP=y
CONFIG_USE_UCLIBCXX=y
--- end config diff ---
Checking installed size
Fetching latest package indexes...
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 80634 100 80634 0 0 33499 0 0:00:02 0:00:02 --:--:-- 33485
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 54082 100 54082 0 0 24252 0 0:00:02 0:00:02 --:--:-- 24252
Comparing package sizes...
Change Local Remote Package
+271 51386 51115 base-files
+123 705241 705118 bnx2-firmware
+86 17209 17123 fstools
+22 47989 47967 procd
+21 208311 208290 busybox
+19 67181 67162 netifd
```
I plan to integrate this script into the CI so we have a summary how
sizes change over different architectures.
Signed-off-by: Paul Spooren <mail@aparcar.org>
