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android: mention in README how to install CI apks on phone
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SomberNight
2 years ago
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contrib/android/Readme.md
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@ -137,3 +137,23 @@ $(cd apk2; find -type f -exec sha256sum '{}' \; > ./../sha256sum2) |
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diff sha256sum1 sha256sum2 > d |
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cat d |
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``` |
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### How to install apks built by the CI on my phone? |
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The CI (Cirrus) builds apks on most git commits. |
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See e.g. [here](https://github.com/spesmilo/electrum/runs/9272252577). |
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The task name should start with "Android build". |
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Click "View more details on Cirrus CI" to get to cirrus' website, and search for "Artifacts". |
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The apk is built in `debug` mode, and is signed using an ephemeral RSA key. |
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For tech demo purposes, you can directly install this apk on your phone. |
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However, if you already have electrum installed on your phone, Android's TOFU signing model |
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will not let you upgrade that to the CI apk due to mismatching signing keys. As the CI key |
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is ephemeral, it is not even possible to upgrade from an older CI apk to a newer CI apk. |
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However, it is possible to resign the apk manually with one's own key, using |
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e.g. [`apksigner`](https://developer.android.com/studio/command-line/apksigner), |
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mutating the apk in place, after which it should be possible to upgrade: |
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``` |
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apksigner sign --ks ~/wspace/electrum/contrib/android/android_debug.keystore Electrum-*-arm64-v8a-debug.apk |
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``` |
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