Hi, whe trying to fix dependency issues I uninstalled a few dev-python/ packages. One of the was dev-python/pyproject2setuppy . Later on I could not install some packages and the error message was not clear enough. Here is an example: >>> Emerging (1 of 8) dev-python/flit_core-3.6.0-r2::gentoo * Fetching files in the background. * To view fetch progress, run in another terminal: * tail -f /var/log/emerge-fetch.log * flit_core-3.6.0.tar.gz BLAKE2B SHA512 size ;-) ... [ ok ] >>> Unpacking source... >>> Unpacking flit_core-3.6.0.tar.gz to /var/tmp/portage/portage/dev-python/flit_core-3.6.0-r2/work >>> Source unpacked in /var/tmp/portage/portage/dev-python/flit_core-3.6.0-r2/work >>> Preparing source in /var/tmp/portage/portage/dev-python/flit_core-3.6.0-r2/work/flit_core-3.6.0 ... >>> Source prepared. >>> Configuring source in /var/tmp/portage/portage/dev-python/flit_core-3.6.0-r2/work/flit_core-3.6.0 ... >>> Source configured. >>> Compiling source in /var/tmp/portage/portage/dev-python/flit_core-3.6.0-r2/work/flit_core-3.6.0 ... * python3_8: running distutils-r1_run_phase distutils-r1_python_compile * ERROR: dev-python/flit_core-3.6.0-r2::gentoo failed (compile phase): * Unable to obtain build-backend from pyproject.toml * * Call stack: * ebuild.sh, line 127: Called src_compile * environment, line 3083: Called distutils-r1_src_compile * environment, line 1360: Called _distutils-r1_run_foreach_impl 'distutils-r1_python_compile' * environment, line 541: Called python_foreach_impl 'distutils-r1_run_phase' 'distutils-r1_python_compile' * environment, line 2762: Called multibuild_foreach_variant '_python_multibuild_wrapper' 'distutils-r1_run_phase' 'distutils-r1_python_compile' * environment, line 2303: Called _multibuild_run '_python_multibuild_wrapper' 'distutils-r1_run_phase' 'distutils-r1_python_compile' * environment, line 2301: Called _python_multibuild_wrapper 'distutils-r1_run_phase' 'distutils-r1_python_compile' * environment, line 861: Called distutils-r1_run_phase 'distutils-r1_python_compile' * environment, line 1348: Called distutils-r1_python_compile * environment, line 1129: Called die * The specific snippet of code: * [[ -z ${build_backend} ]] && die "Unable to obtain build-backend from pyproject.toml"; * * If you need support, post the output of `emerge --info '=dev-python/flit_core-3.6.0-r2::gentoo'`, * the complete build log and the output of `emerge -pqv '=dev-python/flit_core-3.6.0-r2::gentoo'`. * The complete build log is located at '/var/tmp/portage/portage/dev-python/flit_core-3.6.0-r2/temp/build.log'. * The ebuild environment file is located at '/var/tmp/portage/portage/dev-python/flit_core-3.6.0-r2/temp/environment'. * Working directory: '/var/tmp/portage/portage/dev-python/flit_core-3.6.0-r2/work/flit_core-3.6.0' * S: '/var/tmp/portage/portage/dev-python/flit_core-3.6.0-r2/work/flit_core-3.6.0' In short, after getting pyproject2setuppy installed back it disappeared. Please improve the error message. Second, add a dependency into a proper place.
You should never need to unmerge packages and doing so for dev-python/* may have unexpected consequences if things end up having unsatisfied deps.
But that is theory. Commonly I cannot update 'world' and not even 'system' due to dependency conflicts. As I am a dumb user I solve them sometimes by unmerging some things and emerging them back. For example sys-apps/kmod, sys-apps/util-linux, ... Probably stems from the fact I insist on python-2.7, openrc, vmware, I enabled pypy3 some time ago and which probably only complicates the dependency graph and now python-3.6 is gone too. Updating qt and perl was always a pain but now even upgrading python is a hell. That's my life since 2001 with Gentoo. The problem are not new packages and new deps, the problem are packages which got removed from the tree, especially basic languages and libs.
This is PEBKAC. flit_core-3.6.0-r2 doesn't require pp2sp. The PEP 517 build process requires tomli, and I guess that's what you were missing somehow. The dep is definitely there: cat /var/db/repos/gentoo/metadata/md5-cache/dev-python/flit_core-3.6.0-r2 BDEPEND=<...> dev-python/tomli[python_targets_pypy3(-)?,python_targets_python3_8(-)?,python_targets_python3_9(-)?,python_targets_python3_10(-)?]
(In reply to Martin Mokrejš from comment #2) > But that is theory. Commonly I cannot update 'world' and not even 'system' > due to dependency conflicts. As I am a dumb user I solve them sometimes by > unmerging some things and emerging them back. For example sys-apps/kmod, > sys-apps/util-linux, ... Probably stems from the fact I insist on > python-2.7, openrc, vmware, I enabled pypy3 some time ago and which probably > only complicates the dependency graph and now python-3.6 is gone too. > > Updating qt and perl was always a pain but now even upgrading python is a > hell. That's my life since 2001 with Gentoo. The problem are not new > packages and new deps, the problem are packages which got removed from the > tree, especially basic languages and libs. Please speak to us in our user support forums where we can assist with the correct way of doing things.
