On prefix installations, the c-ares library does its own name resolution (not using libc resolver) using hardcoded paths to system files outside of the prefix. In particular, it has hardcoded paths to /etc/nsswitch.conf, /etc/resolv.conf and /etc/hosts, ignoring the prefixed versions of these files like applications using the libc resolver do. This problem specifically affects net-misc/curl, and applications which use curl (such as git), as recent versions of curl have the "adns" flag enabled by default. Portage 3.0.38.1 (python 3.10.7-final-0, default/linux/amd64/17.0, gcc-12.2.0, glibc-2.36-r4, 3.10.0-1160.11.1.el7.x86_64 x86_64) ================================================================= System uname: Linux-3.10.0-1160.11.1.el7.x86_64-x86_64-Intel-R-_Core-TM-_i7-4790_CPU_@_3.60GHz-with-glibc2.36 KiB Mem: 16204164 total, 5284896 free KiB Swap: 32605180 total, 32595964 free Timestamp of repository gentoo: Thu, 13 Oct 2022 00:45:01 +0000 sh bash 5.1_p16-r2 ld GNU ld (Gentoo 2.38 p4) 2.38 ccache version 4.6.1 [enabled] app-misc/pax-utils: 1.3.5::gentoo app-shells/bash: 5.1_p16-r2::gentoo dev-lang/perl: 5.36.0::gentoo dev-lang/python: 2.7.18_p13::gentoo, 3.6.15-r1::gentoo, 3.7.12_p1-r1::gentoo, 3.8.13_p8::gentoo, 3.9.13::gentoo, 3.10.7::gentoo, 3.11.0_rc2::gentoo dev-lang/rust: 1.61.0-r1::gentoo dev-lang/rust-bin: 1.61.0::gentoo dev-util/ccache: 4.6.1::gentoo dev-util/cmake: 3.23.2::gentoo dev-util/meson: 0.63.2-r1::gentoo sys-apps/baselayout: 2.8::gentoo sys-apps/openrc: 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ACCEPT_LICENSE="@FREE" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -march=haswell -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/SCRATCH/gentoo/etc /etc /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/SCRATCH/gentoo/etc/env.d /SCRATCH/gentoo/etc/gentoo-release /etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c" CONFIG_SHELL="/SCRATCH/gentoo/bin/bash" CXXFLAGS="-O2 -march=haswell -pipe" DISTDIR="/SCRATCH/gentoo/var/cache/distfiles" EMERGE_DEFAULT_OPTS="--quiet-build --keep-going --autounmask=n --autounmask-write=n --dynamic-deps=n --unordered-display --verbose-conflicts --with-bdeps-auto=n" ENV_UNSET="CARGO_HOME DBUS_SESSION_BUS_ADDRESS DISPLAY GOBIN GOPATH PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR XDG_STATE_HOME" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs binpkg-multi-instance buildpkg-live ccache config-protect-if-modified distlocks ebuild-locks fixlafiles force-prefix ipc-sandbox merge-sync multilib-strict network-sandbox news parallel-fetch pid-sandbox preserve-libs protect-owned qa-unresolved-soname-deps sfperms strict unknown-features-warn unmerge-logs unmerge-orphans unprivileged xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://distfiles.gentoo.org" LANG="en_CA.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j5" PKGDIR="/SCRATCH/gentoo/var/cache/binpkgs" PORTAGE_CONFIGROOT="/SCRATCH/gentoo/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --exclude=/.git" PORTAGE_TMPDIR="/SCRATCH/gentoo/var/tmp" SHELL="/SCRATCH/gentoo/bin/zsh" USE="X acl amd64 bzip2 cli crypt cups 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F77FLAGS, FC, GCOV, GPROF, INSTALL_MASK, LC_ALL, LD, LEX, LFLAGS, LIBTOOL, LINGUAS, MAKE, MAKEFLAGS, NM, OBJCOPY, OBJDUMP, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, RANLIB, READELF, RUSTFLAGS, SIZE, STRINGS, STRIP, YACC, YFLAGS
Created attachment 823947 [details, diff] proposed fix This patch adjusts c-ares to respect sysconfdir setting and resolves the problem.
(In reply to Nick Bowler from comment #1) > Created attachment 823947 [details, diff] [details, diff] > proposed fix > > This patch adjusts c-ares to respect sysconfdir setting and resolves the > problem. Could you send the patch upstream?
Interestingly enough /etc/resolv.conf doesn't make much sense to grab from prefix. I think in RAP you could have nsswitch but also there I doubt you want to use it. Non-RAP certainly don't want these paths prefixed, else no resolving would be possible at all any more.
All normal prefixed applications using the prefix libc resolver are performing name resolution using the settings from prefixed /etc/nsswitch.conf, prefixed /etc/hosts, and prefixed /etc/resolv.conf. Only curl (via USE=adns / c-ares) is getting this different from every other application as it decides to bypass the libc resolver and use a completely different set of configuration files. Using prefixed configuration files is expected and desired behaviour, as I see it. I can easily symlink /prefix/etc/resolv.conf or whatever to the host system if this is needed (it is not). I can't direct /etc/resolv.conf back to the prefix.
You're describing RAP. I think we could add those symlinks you talk about to a base-package or something, but at this point noone would have those symlinks, so all non-RAP prefixes would be broken. The easiest is probably to apply this patch conditional for !prefix-guest. Nicer solution probably is to pull in some virtual that sets up symlinks or something for hosts that lack these.
