Monthly Archives: May 2020

Better flags for makepkg.conf Samsung Chromebook 2 XE503C32

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CFLAGS="-mcpu=cortex-a15.cortex-a7 -mfloat-abi=hard -mfpu=neon-vfpv4 -O2 -pipe -ffast-math -ftree-vectorize -mvectorize-with-neon-quad -fstack-protector --param=ssp-buffer-size=4"
CXXFLAGS="-mcpu=cortex-a15.cortex-a7 -mfloat-abi=hard -mfpu=neon-vfpv4 -O2 -pipe -ffast-math -ftree-vectorize -mvectorize-with-neon-quad -fstack-protector --param=ssp-buffer-size=4"
LDFLAGS="-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now"
#-- Make Flags: change this for DistCC/SMP systems
MAKEFLAGS="-j8"

Manually connect to wifi in a terminal

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Find wireless device

iwconfig

Bring it up

ip link set mlan0 up

Scan

iwlist mlan0 scan |less

Set up wpa_supplicant

wpa_passphrase ESSID PASSWORD > /etc/wpa_supplicant/my.conf

Connect

wpa_supplicant -Dwext -imlan0 -c/etc/wpa_supplicant/my.conf -B

If your lucky dhcpcd ! other set ip addr and route

dhcpcd mlan0

ip addr add 192.168.1.212/24 broadcast 192.168.1.255 dev mlan0
ip route add default via 192.168.1.1

echo "nameserver 1.1.1.1" > /etc/resolv.conf

manually bring up network on eth0

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ip link set eth0 up
ip addr add 192.168.1.100/24 broadcast 192.168.1.255 dev eth0
ip route add default via 192.168.1.1
echo "nameserver 1.1.1.1" > /etc/resolv.conf

Or

ifconfig eth0 up
ifconfig eth0 192.168.1.100 netmask 255.255.255.0 broadcast 192.168.1.255
route add default gw 192.168.1.1
echo "nameserver 1.1.1.1" > /etc/resolv.conf

Only console users are allowed to run the X server

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It used to be enough to create /etc/X11/Xwrapper.config with the following in it

allowed_users = anybody
needs_root_rights = no

That is no longer enough. So patch X.

Place this following in /etc/portage/patches/x11-base/xorg-server/console.diff
(version 1.20.8 tested but probably works on others ?)
If you’re not using Gentoo then you should be 😉
You’ll need to google how to patch and compile packages on your distro.

diff -Naur a/hw/xfree86/xorg-wrapper.c b/hw/xfree86/xorg-wrapper.c
--- a/hw/xfree86/xorg-wrapper.c	2020-03-29 21:21:15.000000000 +0100
+++ b/hw/xfree86/xorg-wrapper.c	2020-05-22 14:23:59.825069376 +0100
@@ -206,29 +206,6 @@
 
     parse_config(&allowed, &needs_root_rights);
 
-    /* For non root users check if they are allowed to run the X server */
-    if (getuid() != 0) {
-        switch (allowed) {
-        case ROOT_ONLY:
-            /* Already checked above */
-            fprintf(stderr, "%s: Only root is allowed to run the X server\n", argv[0]);
-            exit(1);
-            break;
-        case CONSOLE_ONLY:
-            /* Some of stdin / stdout / stderr maybe redirected to a file */
-            for (i = STDIN_FILENO; i <= STDERR_FILENO; i++) {
-                if (on_console(i))
-                    break;
-            }
-            if (i > STDERR_FILENO) {
-                fprintf(stderr, "%s: Only console users are allowed to run the X server\n", argv[0]);
-                exit(1);
-            }
-            break;
-        case ANYBODY:
-            break;
-        }
-    }
 
 #ifdef WITH_LIBDRM
     /* Detect if we need root rights, except when overriden by the config */

dkimproxy ignores user settings

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Very useful, but unmaintained, dkim email message signing program.
All the time I’ve been using it the sysvinit script to start it has been a mess and various workarounds are needed. With the refusal to accept a different location for private.key being particularly annoying.
At least on debian and ubuntu thisis the case.
Even though you are supposed to be able to override default settings in
/etc/dkimproxy/dkimproxy_out.conf it does not happen.
This is only for dkimproxy.out because that’s all I use but should be adaptable to dkimproxy.in

To do

Mask the sysvinit script. (even though there’s currently no service file for dkimproxy the below still works).

systemctl mask --now dkimproxy.service

Create /etc/systemd/system/dkimproxy-out.service

[Unit]
Description=dkimproxy.out slightly more sane
After=network.target

[Service]
Type=forking
User=dkimproxy
ExecStart=/usr/sbin/dkimproxy.out --conf_file=/etc/dkimproxy/dkimproxy_out.conf
ExecStop=/bin/kill -15 $MAINPID
Restart=always
RestartSec=3

[Install]
WantedBy=multi-user.target

Create (or edit) /etc/dkimproxy/dkimproxy_out.conf with options of your choosing which will now be honoured.

user	 			dkimproxy
group		 		dkimproxy
min_servers 		2
min_spare_servers 	1
listen    			127.0.0.1:10027
relay     			127.0.0.1:10028
domain    			xxxx.co.uk,bbbb.com
signature 			dkim
method				relaxed
keyfile 			/etc/dkimproxy/private.key
selector 			selector1
daemonize

Enable and start.

systemctl enable --now dkimproxy-out.service

rtorrent sequential download

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Patch libtorrent

diff --git a/src/download/chunk_selector.cc b/src/download/chunk_selector.cc
index 850fec0f..248a29f9 100644
--- a/src/download/chunk_selector.cc
+++ b/src/download/chunk_selector.cc
@@ -82,7 +82,7 @@ ChunkSelector::update_priorities() {
   m_sharedQueue.clear();
 
   if (m_position == invalid_chunk)
-    m_position = random() % size();
+    m_position = 0;
 
   advance_position();
 }
@@ -100,14 +100,6 @@ ChunkSelector::find(PeerChunks* pc, __UNUSED bool highPriority) {
   // set.
   rak::partial_queue* queue = pc->is_seeder() ? &m_sharedQueue : pc->download_cache();
 
-  // Randomize position on average every 16 chunks to prevent
-  // inefficient distribution with a slow seed and fast peers
-  // all arriving at the same position.
-  if ((random() & 63) == 0) {
-    m_position = random() % size();
-    queue->clear();
-  }
-
   if (queue->is_enabled()) {
 
     // First check the cached queue.

Libvirt – Auto resize does not work on most linux guests

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It is left to the DM to resize after being informed by libvirt there has been a change. Many don’t.
Poor design decision IMHO. 

xrandr --output Virtual-1 --auto

Will resize to the window size you have chosen. The Virtual-1 part might need adjusting. You can find out by using

xrandr

on it’s own. In the case of a Manjero VM I just installed

$ xrandr
Screen 0: minimum 320 x 200, current 1256 x 869, maximum 8192 x 8192
Virtual-1 connected primary 1256x869+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1256x869      59.98*+
   2560x1600     59.99    59.97  ....................................

So it’s Virtual-1.

Make a script and link it to a hotkey and it’s less of an annoyance.

Note: spice-vdagent may need to be installed and running for this to work ?