Re: [gentoo-alt] Gentoo Prefix On Ubuntu: Chown and Users

[Fabian Groffen]

Hi Ricardo,

Sorry, your email seems to have slipped through.  Some answers inline:

On 09-07-2018 23:48:00 -0400, Ricardo Grant wrote:
> Hello!
>
> The more I read about portage the more I like it, it has very nice features. I
> Decided to use prefix on Ubuntu 16.04. The bootstrap script successfully
> completed. I had to slightly modify my `bashrc`(default from Ubuntu)  since
> gentoo's `lesspipe` works differently, however `startprefix` works as intended.
> In the stage logs I see various `chown` failures. Like these:
>
> ```
>  chown failure ignored with unprivileged user:
>  *     chown -R root:0 ${D}${EPREFIX}/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0
>  *     /bin/chown: changing ownership of
> '${D}${EPREFIX}/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/libvtv.a': Operation not
> permitted
>  * /bin/chown: changing ownership of
> '${D}${EPREFIX}/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/libtsan_preinit.o':
> Operation not permitted
>
> ...
>
> ```
>
> It's interesting to note it uses Ubuntu's `chown`. I assume this fails because
> `sudo` would be required. Does this affect me on using prefix?

This should only be during bootstrap, not everything is there yet.
Finally, it will use $EPREFIX/bin/chown and also fail (and ignore).
This is because mainline Gentoo Linux assumes root access, and Prefix
does not.  Hence it is a warning and not an error.  It is safe to
ignore.

> Some other
> concerns:
>
> ```
>
> * Failed to set PT_PAX markings -r
> /home/ricardo/gentoo/tmp/var/tmp/portage/sys-devel/gcc-7.3.0-r3/image//home/ricardo/gentoo/tmp/usr/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1.
>  * Failed to set XATTR_PAX markings -r
> /home/ricardo/gentoo/tmp/var/tmp/portage/sys-devel/gcc-7.3.0-r3/image//home/ricardo/gentoo/tmp/usr/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1.
>  * Failed to set PT_PAX markings -r
> /home/ricardo/gentoo/tmp/var/tmp/portage/sys-devel/gcc-7.3.0-r3/image//home/ricardo/gentoo/tmp/usr/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1plus.
>  * Failed to set XATTR_PAX markings -r
> /home/ricardo/gentoo/tmp/var/tmp/portage/sys-devel/gcc-7.3.0-r3/image//home/ricardo/gentoo/tmp/usr/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/cc1plus
>
> ...
>
> ```
>
> I assume because `chown` fails?

No, pax-utils is probably not yet emerged at this point.  During the
bootstrap process, however, you can safely ignore this, as all packages
are re-installed in the last step.  These things get done properly by
then.

> I am also curious as to the philosophy of Gentoo Prefix. Do I always use a
> prefix sessions to work / use portage based packages? Is it possible for more
> cohesion with my system packages? It would be nice to open gui apps without
> launching them from the command line ( I assume that’s how you would do it).

The general idea is to "enter" the Prefix system and use everything from
there.  Reason why historically was because everything on the host
system sulks, but nowadays it is mostly because you just want the
specific versions as provided by Gentoo.  It is hard, if not impossible,
to maintain compatibility with host-provided packages.  In reality,
though you might find some things just work well when mixed.

Thanks,
Fabian

> Here is my `emerge --info` :
>
> ```
> Portage 2.3.41 (python 3.5.5-final-0,
> default/linux/amd64/17.0/no-multilib/prefix/kernel-3.2+, gcc-7.3.0,
> glibc-2.27-r5, 4.13.0-45-generic x86_64)
> =================================================================
> System uname:
> Linux-4.13.0-45-generic-x86_64-Intel-R-_Pentium-R-_CPU_4415U_@_2.30GHz-with-debian-stretch-sid
> KiB Mem:     3905956 total,    139788 free
> KiB Swap:    4059132 total,   3843540 free
> Timestamp of repository gentoo: Mon, 09 Jul 2018 01:30:01 +0000
> Head commit of repository gentoo: 1c5415775dabb4a420dcd040894c5f254ea034dd
> sh bash 4.4_p23
> ld GNU ld (Gentoo 2.30 p3) 2.30.0
> app-shells/bash:          4.4_p23::gentoo
> dev-lang/perl:            5.26.2::gentoo
> dev-lang/python:          2.7.15::gentoo, 3.5.5-r1::gentoo
> dev-util/pkgconfig:       0.29.2::gentoo
> sys-apps/baselayout:      2.6::gentoo
> sys-apps/sandbox:         2.13::gentoo
> sys-devel/autoconf:       2.69-r4::gentoo
> sys-devel/automake:       1.16.1-r1::gentoo
> sys-devel/binutils:       2.30-r3::gentoo
> sys-devel/gcc:            7.3.0-r3::gentoo
> sys-devel/gcc-config:     1.9.1::gentoo
> sys-devel/libtool:        2.4.6-r5::gentoo
> sys-devel/make:           4.2.1-r3::gentoo
> sys-kernel/linux-headers: 4.17::gentoo (virtual/os-headers)
> sys-libs/glibc:           2.27-r5::gentoo
> Repositories:
>
> gentoo
>     location: /home/ricardo/gentoo/usr/portage
>     sync-type: rsync
>     sync-uri: rsync://[1]rsync.gentoo.org/gentoo-portage
>     priority: -1000
>     sync-rsync-verify-max-age: 24
>     sync-rsync-verify-metamanifest: yes
>     sync-rsync-extra-opts:
>     sync-rsync-verify-jobs: 1
>
> ACCEPT_KEYWORDS="amd64 ~amd64"
> ACCEPT_LICENSE="* -@EULA"
> CBUILD="x86_64-pc-linux-gnu"
> CFLAGS="-O2 -pipe -O2 -pipe"
> CHOST="x86_64-pc-linux-gnu"
> CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt"
> CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/gconf
> /etc/sandbox.d /etc/terminfo /home/ricardo/gentoo/etc/gentoo-release"
> CXXFLAGS="-O2 -pipe -O2 -pipe"
> DISTDIR="/home/ricardo/gentoo/usr/portage/distfiles"
> ENV_UNSET="DBUS_SESSION_BUS_ADDRESS DISPLAY PERL5LIB PERL5OPT PERLPREFIX
> PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME
> XDG_DATA_HOME XDG_RUNTIME_DIR"
> FCFLAGS="-O2 -pipe"
> FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks
> ebuild-locks fixlafiles force-prefix merge-sync multilib-strict news
> parallel-fetch preserve-libs protect-owned sfperms strict unknown-features-warn
> unmerge-logs unmerge-orphans unprivileged"
> FFLAGS="-O2 -pipe"
> GENTOO_MIRRORS="[2]http://distfiles.gentoo.org"
> LDFLAGS="-Wl,-O1 -Wl,--as-needed"
> MAKEOPTS="-j3"
> PKGDIR="/home/ricardo/gentoo/usr/portage/packages"
> PORTAGE_CONFIGROOT="/home/ricardo/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="/home/ricardo/gentoo/var/tmp"
> USE="acl amd64 berkdb bzip2 cli crypt cxx dri fortran gdbm iconv ipv6 libtirpc
> modules ncurses nls nptl openmp pcre prefix readline seccomp ssl tcpd unicode
> zlib" ABI_X86="64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106
> cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m
> maestro3 trident usb-audio via82xx via82xx-modem ymfpci"
> APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias
> auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm
> authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache
> cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter
> file_cache filter headers include info log_config logio mem_cache mime
> mime_magic negotiation rewrite setenvif speling status unique_id userdir
> usertrack vhost_alias" CALLIGRA_FEATURES="karbon plan sheets stage words"
> COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog"
> CPU_FLAGS_X86="mmx mmxext sse sse2" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm
> earthmate evermore fv18 garmin garmintxt gpsclock isync itrax mtk3301 nmea ntrip
> navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2
> timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="libinput keyboard mouse"
> KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001
> mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console
> presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-6
> php7-0" POSTGRES_TARGETS="postgres9_5 postgres10"
> PYTHON_SINGLE_TARGET="python3_5" PYTHON_TARGETS="python2_7 python3_5"
> RUBY_TARGETS="ruby23" USERLAND="GNU" VIDEO_CARDS="amdgpu fbdev intel nouveau
> radeon radeonsi vesa dummy v4l" XTABLES_ADDONS="quota2 psd pknock lscan length2
> ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal
> rawnat logmark ipmark dhcpmac delude chaos account"
> Unset:  CC, CPPFLAGS, CTARGET, CXX, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG,
> LC_ALL, LINGUAS, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS,
> PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
> ```
>
> TIA
>
> -- Ricardo Grant
>
> Computer Science Student, Laurentian University
>
> P: 705 470 5386
>
> E: [3]rgrant@××××××××××.ca
>
>
>
>  References:
>    1. http://rsync.gentoo.org/gentoo-portage
>    2. http://distfiles.gentoo.org
>    3. mailto:rgrant@××××××××××.ca
>
> read_char: errno==EILSEQ; invalid byte sequence for UTF-8:
-- 
Fabian Groffen
Gentoo on a different level