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Suppose you don't have a testbuild directory containing any already built bundles. Now, start a build with make testbuild-android-armv7 to get an .apk. The result is a stalled build in the release project.

The reason for that is that

sha256sum $(ls -1 *.exe *.tar.xz *.dmg *.mar *.zip *.tar.gz | grep -v '\.incremental\.mar$' | sort) > sha256sums-unsigned-build.txt

evaluates to

sha256sum > sha256sums-unsigned-build.txt

which waits for input. We have not been hitting that so far as both in the alpha and the nightly case other bundles in the directory are available. And for the mobile case legacy/trac#25164 (moved) is about to fix this as well. However, we might want to be a bit more conservative and only execute sha256sum if we actually have an argument to pass. Otherwise this can lead to surprising results (like in this case).