Richard Kettlewell ewxrjk
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/ gist:cbaf528e526cf9d6017d
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August 29, 2015 14:19
Bizarre /dev/tty behavior on GNU HUrd
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| araminta:~$ ssh heceptor -t ls -l /dev/tty | |
| crw--w---- 1 richard tty 0, 0 Jul 14 2012 /dev/tty | |
| Connection to heceptor closed. | |
| araminta:~$ ssh heceptor 'echo /dev/tt?' | |
| /dev/tty | |
| araminta:~$ ssh heceptor ls -l /dev/tty | |
| ls: cannot access /dev/tty: No such device or address | |
| araminta:~$ ssh heceptor uname -a | |
| GNU heceptor 0.3 GNU-Mach 1.3.99-486/Hurd-0.3 i686-AT386 GNU |
ewxrjk
/ gist:c3f80a16d61c35678301
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August 29, 2015 14:20
clang -fsanitize=address breaks initial stream orientation
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| richard@deodand:~/junk$ cat t.c | |
| #include <stdio.h> | |
| #include <wchar.h> | |
| int main(void) { | |
| FILE *fp = fopen("/dev/null", "r"); | |
| return printf("initial orientation: %d\n", fwide(fp, 0)); | |
| } | |
| richard@deodand:~/junk$ clang-3.6 -fsanitize=address -o t t.c | |
| richard@deodand:~/junk$ ./t |
ewxrjk
/ gist:6c532651533403dd31c3
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August 29, 2015 14:20
Debian sid unprivileged container setup
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| Install required packages: | |
| # apt-get install uidmap lxc | |
| # ..and cgmanager? or not? Who can say? | |
| Enable unshare: | |
| # echo 'kernel.unprivileged_userns_clone = 1' >> /etc/sysctl.d/local.conf | |
| # sysctl --system | |
| Check /etc/subuid and /etc/subgid and add ranges if missing, e.g.: | |
| # usermod -v 886432-951967 richard |
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| Mirroring to /space/mirrors/debian from http://ftp.uk.debian.org/debian/ | |
| Arches: amd64,i386 | |
| Dists: jessie,jessie-updates,jessie-backports,stretch,stretch-updates,sid | |
| Sections: main,contrib,non-free,main/debian-installer | |
| Including source. | |
| Pdiff mode: use | |
| Will clean up after mirroring. | |
| Attempting to get lock ... | |
| Updating remote trace files (using rsync) ... |
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| From: root@... | |
| To: root@... | |
| Subject: Cron <root@...> test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily ) | |
| Date: Tue, 26 May 2015 02:28:06 +0100 | |
| /etc/cron.daily/logrotate: | |
| 2015/05/26 02:26:51| WARNING: (B) '127.0.0.1' is a subnetwork of (A) '127.0.0.1' | |
| 2015/05/26 02:26:51| WARNING: because of this '127.0.0.1' is ignored to keep splay tree searching predictable | |
| 2015/05/26 02:26:51| WARNING: You should probably remove '127.0.0.1' from the ACL named 'localhost' | |
| 2015/05/26 02:26:51| WARNING: (B) '127.0.0.1' is a subnetwork of (A) '127.0.0.1' |
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| $ dig mx va | |
| ; <<>> DiG 9.9.5-9-Debian <<>> mx va | |
| ;; global options: +cmd | |
| ;; Got answer: | |
| ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 18186 | |
| ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 6, ADDITIONAL: 16 | |
| ;; OPT PSEUDOSECTION: | |
| ; EDNS: version: 0, flags:; udp: 4096 |
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| udplog.c: In function ‘main’: | |
| udplog.c:72:5: error: assuming signed overflow does not occur when assuming that (X + c) >= X is always true [-Werror=strict-overflow] | |
| int main(int argc, char **argv) { | |
| ^ | |
| udplog.c:72:5: error: assuming signed overflow does not occur when assuming that (X + c) >= X is always true [-Werror=strict-overflow] | |
| cc1: all warnings being treated as errors |
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| $ type g++-5 | |
| g++-5 is /usr/bin/g++-5 | |
| $ g++-5 --version | |
| g++-5 (Debian 5.2.1-23) 5.2.1 20151028 | |
| Copyright (C) 2015 Free Software Foundation, Inc. | |
| This is free software; see the source for copying conditions. There is NO | |
| warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
| $ dpkg -l g++-5 libstdc++-5-dev | |
| Desired=Unknown/Install/Remove/Purge/Hold |
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| $ cat 4096.py | |
| import pyprimes | |
| p=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|
ewxrjk
/ gist:ba9a3c970273132bc46300478480537a
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August 21, 2016 09:35
lxc guest can reach router but not host
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| tcpdump on host showing that container (.19) can each other hosts (e.g. .1) but does not get a response to host address (.18) | |
| rjk@araminta:~$ really tcpdump -npi vethE23AI6: host 172.17.207.19 | |
| tcpdump: verbose output suppressed, use -v or -vv for full protocol decode | |
| listening on vethE23AI6:, link-type EN10MB (Ethernet), capture size 262144 bytes | |
| 10:29:25.994201 IP 172.17.207.19.48716 > 172.17.207.1.53: 64233+ A? mirror.anjou.terraraq.org.uk. (46) | |
| 10:29:25.994243 IP 172.17.207.19.48716 > 172.17.207.1.53: 58575+ AAAA? mirror.anjou.terraraq.org.uk. (46) | |
| 10:29:25.994947 IP 172.17.207.1.53 > 172.17.207.19.48716: 64233* 1/3/2 A 172.17.207.18 (169) | |
| 10:29:25.995129 IP 172.17.207.1.53 > 172.17.207.19.48716: 58575* 0/1/0 (98) | |
| 10:29:25.995240 IP 172.17.207.19.58774 > 172.17.207.18.80: Flags [S], seq 4164822563, win 29200, options [mss 1460,sackOK,TS val 13201837 ecr 0,nop,wscale 7], length 0 |
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