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Since upstream commit 89a86dcb0a3248606824de50f5c63f61cfe0369c (first release: 106) if cargo exists on PATH the Dracut configure script enables building dracut-cpio by default, and calls "cargo --version" to check if cargo works. This fails on the autobuilders: error: rustup could not choose a version of cargo to run, because one wasn't specified explicitly, and no default is configured. help: run 'rustup default stable' to download the latest stable release of Rust and set it as your default toolchain. dracut couldn't find cargo for dracut-cpio build The affected configs either don't have BR2_PACKAGE_HOST_RUSTC enabled, or build-time.log.gz shows host-rustc was not installed before the host-dracut build, so presumably the "cargo" that produces the rustup error is an external one already installed on the autobuilders. To fix this, enable dracut-cpio only if BR2_PACKAGE_HOST_RUSTC=y, and add a dependency on host-rustc in that case. According to the documentation [1, see "enhanced_cpio"] dracut-cpio is supposed to optimize archive creation for copy-on-write filesystems, so it should not matter much for Buildroot. The --disable-dracut-cpio option was added in upstream commit 4a4ab928a49e81e02104ec5466160664e59c3965 (same release). Fixes: https://autobuild.buildroot.org/results/5f557d708cce997e7f039f17e30640b02ba9180a/ Fixes: https://autobuild.buildroot.org/results/f04ca3c4598f62a7e87d84bc111eb8b161b34a70/ (and more) [1] https://dracut-ng.github.io/dracut/man/dracut.conf.5.html#_configuration_options Signed-off-by: Fiona Klute (Othermo GmbH) <fiona.klute@gmx.de> Signed-off-by: Julien Olivain <ju.o@free.fr>