im using DWM (Tiling Window Manager) with dwmblocks for the statusbar on my laptop. i have 3 usb ports on this laptop. im using this script to detect and show a block(icon) on the statusbar when i connect a usb drive.
if [[ "$(dmesg -S | tail | grep "usb-storage")" =~ "USB Mass Storage device detected" ]]; then
icon=" 🎙️ "
else
icon=""
fi
printf "%s%s\\n" "$icon"
but this script is not good enough. when i connect 1 usb it gives this
[ 151.134547] usb-storage 1-2:1.0: USB Mass Storage device detected
[ 151.138129] scsi host2: usb-storage 1-2:1.0
[ 152.157810] scsi 2:0:0:0: Direct-Access MBIL SSM Moser Baer Disk 8.07 PQ: 0 ANSI: 4
[ 152.158051] sd 2:0:0:0: Attached scsi generic sg2 type 0
[ 152.158711] sd 2:0:0:0: [sdb] 31027200 512-byte logical blocks: (15.9 GB/14.8 GiB)
[ 152.159381] sd 2:0:0:0: [sdb] Write Protect is off
[ 152.159387] sd 2:0:0:0: [sdb] Mode Sense: 23 00 00 00
[ 152.160066] sd 2:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[ 152.924036] sdb: sdb1 sdb2 sdb3
[ 152.926370] sd 2:0:0:0: [sdb] Attached SCSI removable disk
when i connect another usb at the same time it gives this
[ 364.948449] scsi host3: usb-storage 1-1:1.0
[ 366.206529] scsi 3:0:0:0: Direct-Access SRT USB 1100 PQ: 0 ANSI: 4
[ 366.206834] sd 3:0:0:0: Attached scsi generic sg3 type 0
[ 366.207126] sd 3:0:0:0: [sdc] 15818752 512-byte logical blocks: (8.10 GB/7.54 GiB)
[ 366.207629] sd 3:0:0:0: [sdc] Write Protect is off
[ 366.207631] sd 3:0:0:0: [sdc] Mode Sense: 43 00 00 00
[ 366.208117] sd 3:0:0:0: [sdc] No Caching mode page found
[ 366.208119] sd 3:0:0:0: [sdc] Assuming drive cache: write through
[ 366.237610] sdc: sdc1
[ 366.239332] sd 3:0:0:0: [sdc] Attached SCSI removable disk
which doesn't have usb-storage to grep so the icon disappears even though i have 2 usb connected.
when i connect a usb portable 2.5" hdd it gives this ( i extended tail range to -n 15 )
[ 659.426376] usb 1-3: Product: USB 3.0 Device
[ 659.426377] usb 1-3: Manufacturer: USB 3.0 Device
[ 659.426379] usb 1-3: SerialNumber: 00000000B032
[ 659.433060] scsi host4: uas
[ 659.433839] scsi 4:0:0:0: Direct-Access WDC WD10 SPZX-00Z10T0 0117 PQ: 0 ANSI: 6
[ 659.435213] sd 4:0:0:0: Attached scsi generic sg4 type 0
[ 659.435840] sd 4:0:0:0: [sdd] 1953525168 512-byte logical blocks: (1.00 TB/932 GiB)
[ 659.435842] sd 4:0:0:0: [sdd] 4096-byte physical blocks
[ 659.436038] sd 4:0:0:0: [sdd] Write Protect is off
[ 659.436041] sd 4:0:0:0: [sdd] Mode Sense: 53 00 10 08
[ 659.436349] sd 4:0:0:0: [sdd] Disabling FUA
[ 659.436351] sd 4:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 659.436476] sd 4:0:0:0: [sdd] Optimal transfer size 33553920 bytes not a multiple of physical block size (4096 bytes)
[ 659.578561] sdd: sdd1
[ 659.580012] sd 4:0:0:0: [sdd] Attached SCSI disk
usb hdd doesn't even have a usb-storage to grep.
also when 1 of the flash drive was connected and i rebooted the icon didn't show because the dmesg tail was about my wifi being connected and networkmanager.
any idea's for improving this script, as this is not reliable.
I found the solution to this on linuxquestions.org.
Solution -
#!/bin/bash
if [[ "$(udisksctl dump|awk -F':\n' -vRS= '/[ \t]*HintAuto:[ \t]*true/&&/\.Filesystem:/{print "found"}')" != "" ]]; then
icon=" "
else
icon=""
fi
printf "%s%s\\n" "$icon"