Stamp

Sign git commit-id on ios app icon when build phase.

Setup

First, to use stamp, you have to install imagemagick and ghostscript command to your mac:

brew install imagemagick ghostscript

Then, download stamp binary:

wget https://github.com/ainoya/stamp/releases/download/v0.1.0/stamp -O /usr/local/bin/stamp && chmod +x /usr/local/bin/stamp

How to use

USAGE:
   Stamp [global options] command [command options] [arguments...]

GLOBAL OPTIONS:
   --in                 File path of source icon
   --out                File path of output image

For example:

stamp --in YourAppRepository/icon-60@2x-origin.png --out assets/icon-60@2x.png

If you want to add git commit-id to your app icon with stamp, add below script run script section in "Build phase" of Xcode:

export PATH=$PATH:/usr/local/bin

for orig in $(find ${SRCROOT} -name '*-origin.png'); do
    OUTPUT_PATH=$(echo ${orig} | sed "s/-origin//")
stamp --in ${orig} --out ${OUTPUT_PATH}
done

In this case, you have to locate your original app icon as named *-origin.png. this script strip -origin prefix and use it as generated icon name.

for Example, if you name original icon as icon-60@2x-origin.png, Generated file will be named icon-60@2x.png, then you need to set icon-60@2x.png instead of icon-60@2x-origin.png in your App icon assets before.

Reference

• Overlaying application version on top of your icon - Krzysztof Zabłocki