When DISTDIR is a read-only NFS share (as described under skiprocheck in make.conf(5)) and a package specifies multiple possible URIs for a file, portage fails unless the first URI it tries works. wget produces a zero-size file on failure and portage tries to unlink that file, which of course fails when the mount is read-only. I am not sure why this unlink is necessary, as wget is perfectly happy to overwrite files. Either portage should not try to unlink files in read-only directories, failure to do so should be made nonfatal, or there should be another make.conf variable to specify a command to use for unlinking. >>> Downloading 'http://dev.gentoo.org/~nirbheek/mozilla/patchsets/firefox-28.0-patches-0.1.tar.xz' --2014-03-22 18:56:05-- http://dev.gentoo.org/~nirbheek/mozilla/patchsets/firefox-28.0-patches-0.1.tar.xz Resolving dev.gentoo.org... 140.211.166.183 Connecting to dev.gentoo.org|140.211.166.183|:80... connected. HTTP request sent, awaiting response... 404 Not Found 2014-03-22 18:56:05 ERROR 404: Not Found. >>> Deleting distfile with size 0 (smaller than PORTAGE_FETCH_RESUME_MIN_SIZE) Traceback (most recent call last): File "/usr/lib/portage/pym/portage/util/_async/ForkProcess.py", line 45, in _spawn rval = self._run() File "/usr/lib/portage/pym/_emerge/EbuildFetcher.py", line 172, in _run allow_missing_digests=allow_missing): File "/usr/lib/portage/pym/portage/package/ebuild/fetch.py", line 959, in fetch os.unlink(myfile_path) File "/usr/lib/portage/pym/portage/__init__.py", line 259, in __call__ rval = self._func(*wrapped_args, **wrapped_kwargs) OSError: [Errno 30] Read-only file system: '/usr/portage/distfiles/firefox-28.0-patches-0.1.tar.xz' * Fetch failed for 'www-client/firefox-28.0', Log file: * '/mnt/build/log/www-client:firefox-28.0:20140322-225603.log.gz' $ emerge --info Portage 2.2.8-r1 (default/linux/arm/13.0/armv7a, gcc-4.7.3, glibc-2.17, 2.6.31.14.26-efikamx armv7l) ================================================================= System uname: Linux-2.6.31.14.26-efikamx-armv7l-ARMv7_Processor_rev_5_-v7l-with-gentoo-2.2 KiB Mem: 465852 total, 129788 free KiB Swap: 2659520 total, 2659520 free Timestamp of tree: Sat, 22 Mar 2014 06:45:01 +0000 ld GNU ld (GNU Binutils) 2.23.2 distcc 3.1 armv7a-hardfloat-linux-gnueabi [disabled] app-shells/bash: 4.2_p45 dev-lang/python: 2.7.5-r3, 3.3.3 dev-util/cmake: 2.8.11.2 dev-util/pkgconfig: 0.28 sys-apps/baselayout: 2.2 sys-apps/openrc: 0.12.4 sys-apps/sandbox: 2.6-r1 sys-devel/autoconf: 2.13, 2.69 sys-devel/automake: 1.13.4 sys-devel/binutils: 2.23.2 sys-devel/gcc: 4.7.3-r1 sys-devel/gcc-config: 1.7.3 sys-devel/libtool: 2.4.2 sys-devel/make: 3.82-r4 sys-kernel/linux-headers: 3.9 (virtual/os-headers) sys-libs/glibc: 2.17 Repositories: gentoo ACCEPT_KEYWORDS="arm" ACCEPT_LICENSE="@FREE" CBUILD="armv7a-hardfloat-linux-gnueabi" CFLAGS="-O2 -pipe -mcpu=cortex-a8 -mfpu=vfpv3 -mfloat-abi=hard" CHOST="armv7a-hardfloat-linux-gnueabi" CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /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" CXXFLAGS="-O2 -pipe -mcpu=cortex-a8 -mfpu=vfpv3 -mfloat-abi=hard" DISTDIR="/usr/portage/distfiles" EMERGE_DEFAULT_OPTS="--ask" FCFLAGS="-O2 -pipe -march=armv7-a" FEATURES="assume-digests binpkg-logs clean-logs compress-build-logs config-protect-if-modified ebuild-locks fixlafiles merge-sync news preserve-libs protect-owned sandbox sfperms skiprocheck strict unknown-features-warn unmerge-orphans userfetch userpriv usersandbox usersync" FFLAGS="-O2 -pipe -march=armv7-a" GENTOO_MIRRORS="http://gentoo.netnitco.net http://mirror.mcs.anl.gov/pub/gentoo/ http://mirror.csclub.uwaterloo.ca/gentoo-distfiles/ http://mirror.datapipe.net/gentoo ftp://mirror.datapipe.net/gentoo" LANG="POSIX" LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,--hash-style=gnu -Wl,--no-keep-memory,--reduce-memory-overheads" MAKEOPTS="-j2" PKGDIR="/mnt/build/packages" PORTAGE_CONFIGROOT="/" 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" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="" SYNC="rsync://rsync.namerica.gentoo.org/gentoo-portage" USE="X acl arm berkdb bindist bzip2 cairo cli cracklib crypt cxx dri emacs fortran gdbm gtk iconv jpeg latex modules ncurses neon nptl openmp pam pcre png readline session ssl system-sqlite tcpd truetype unicode zlib" 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="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="evdev" 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="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_3" RUBY_TARGETS="ruby19 ruby20" USERLAND="GNU" VIDEO_CARDS="fbdev modesetting" 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: CPPFLAGS, CTARGET, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON