wifi restarting scripts

2 files changed, 76 insertions, 0 deletions

diff --git a/dot/local/bin/hard-restart-wifi b/dot/local/bin/hard-restart-wifi
new file mode 100755
index 0000000..78f7144
--- /dev/null
+++ b/dot/local/bin/hard-restart-wifi
@@ -0,0 +1,23 @@
+#!/bin/sh
+
+default_dev='wlan0=funston'
+
+die() { printf 'Error: %s\n' "$*" >&2; exit 1; }
+
+with_pwd_path()
+{
+    local PATH="$PATH":.
+    "$@"
+}
+
+[ $(id -u) = 0 ] || die "you are not root."
+
+restart=$(with_pwd_path which restart-linux-device) || die "command 'restart-linux-device' is not available."
+
+dev=${1:-$default_dev}
+rawdev=${dev%=*}
+
+[ "$VERBOSE" ] && set -x
+$restart $rawdev
+ifdown --force $rawdev # It's not clear to me why this is necessary, but it is.
+ifup $dev
diff --git a/dot/local/bin/restart-linux-device b/dot/local/bin/restart-linux-device
new file mode 100755
index 0000000..e1cd41f
--- /dev/null
+++ b/dot/local/bin/restart-linux-device
@@ -0,0 +1,53 @@
+#!/bin/bash
+
+# Thanks, ericwoud
+# https://ubuntuforums.org/showthread.php?t=2339439&page=2&p=13585921#post13585921
+
+warn() { printf 'Error: %s\n' "$*" >&2; }
+
+with_rescan_remove()
+{
+    local devname="$1" dev f hw_path rescan remove
+    shift
+
+    case "$devname" in
+        */*)
+            dev=/sys/class/$devname ;;
+        *)
+            for f in /sys/class/*/"$devname"; do
+                dev=$f
+                break
+            done
+            ;;
+    esac
+    [ "$dev" -a -d "$dev" ] || { warn "device not found: $devname"; return 1; }
+
+    hw_path=$(dirname $(dirname $(realpath "$(dirname "$dev")/$(readlink "$dev")")))
+
+    rescan=$(dirname "$hw_path")/rescan
+    remove="$hw_path"/remove
+
+    if [ ! -e "$rescan" -a -e "$hw_path"/../pci_bus ]; then
+        local p=$(dirname "$hw_path")/
+        rescan=$p/pci_bus/${p#*/pci}/rescan
+    fi
+
+    [ -e "$rescan" ] || { warn "sysfs special file not found: $rescan"; return 1; }
+    [ -e "$remove" ] || { warn "sysfs special file not found: $remove"; return 1; }
+
+    "$@" "$rescan" "$remove"
+}
+
+restart()
+{
+    local rescan="$1" remove="$2"
+    printf 1 > "$remove" || { warn "kernel remove failed"; return 2; }
+    printf 1 > "$rescan" || { warn "kernel rescan failed"; return 3; }
+
+    for ((i=0; i<100; ++i)); do
+        [ -e "$remove" ] && break
+        sleep 0.05
+    done
+}
+
+with_rescan_remove "$1" restart