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I was editing my fstab and somehow [spooky music] deleted it. As you can imagine this has caused some problems and I have searched online for the shape of the default file to no avail.

Can someone with a working setup just run cat /etc/fstab and post the results please? I understand I will have to change the UUIDs.

I'm on Raspberry Pi 3, running Raspbian following the standard tutorial.

Maybe someone could also include the pi-2 setup for completeness..

2 Answers 2

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I have a Raspberry Pi 3.

cat /etc/fstab

proc            /proc           proc    defaults          0 0
PARTUUID=232c31bf-01  /boot           vfat    defaults 0       2
PARTUUID=232c31bf-02  /               ext4    defaults,noatime 0       1
# a swapfile is not a swap partition, no line here
#   use  dphys-swapfile swap[on|off]  for that
5
  • Note that the PARTUUID needs to be adjusted, unless the OP used exactly the same image as you did. Commented Dec 23, 2021 at 20:51
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    @DmitryGrigoryev Exactly. The OP acknowledged this when he said: "I understand I will have to change the UUIDs," in his post.
    – Sanders
    Commented Dec 24, 2021 at 18:58
  • @Sanders If I'm not mistaken, he added this line to his post after my comment. You kinda make it sound like I didn't read the question well enough. Commented Dec 26, 2021 at 0:10
  • @DmitryGrigoryev I did not know he added that line after the fact. I just self-educated myself how to check what was edited. Please accept my apology for sounding disrespectable - that was not my intent as I was completely agreeing with you.
    – Sanders
    Commented Dec 26, 2021 at 1:06
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    No, I did not add that line after your post Dmitry. I knew I had to change the IDs. Sanders was right, I acknowledged it. And you didn't read the question well enough.
    – Wapiti
    Commented Dec 27, 2021 at 18:46
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There is no "standard" - generally PARTUUID depends on the specific image installed. (It can also be changed - which I do routinely.)

I use the following code to verify images, as it often gets confused restoring from backups.

#! /bin/sh
# 2021-02-10

#   Check consistency of Disk identifier in cmdline.txt /etc/fstab

# Determine Disk identifier
DISKID=$(sudo fdisk -l /dev/mmcblk0 | awk '/Disk identifier/ {print $3};' | sed 's/0x//')

# Use sed to delete all BEFORE PARTUUID= and all AFTER -0  in /boot/cmdline.txt
ROOTPART=$(sed -e 's/^.*PARTUUID=//' -e 's/-0.*$'// /boot/cmdline.txt)
echo "Disk ID\t\t"$DISKID
echo "root PARTUUID\t"$ROOTPART

# find first PARTUUID ext4 in /etc/fstab
EXISTFSTABPART=$(awk '/PARTUUID.*ext4/ {print $1; exit};' /etc/fstab | sed -e 's/^.*PARTUUID=//' -e 's/-0.*$'//)

echo "Existing fstab\t"$EXISTFSTABPART

if [ $DISKID = $EXISTFSTABPART ]; then
    echo "Looks OK!"
# else
fi

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