On 2023-02-25, at 20:17:34 +0200, Adrian Bunk wrote: > Package: ebtables > Version: 2.0.11-5 > Severity: serious > > ... > Setting up ebtables (2.0.11-5) ... > update-alternatives: using /usr/sbin/ebtables-legacy to provide > /usr/sbin/ebtables (ebtables) in auto mode > update-alternatives: error: cannot stat file '/usr/sbin/ebtables': Too many > levels of symbolic links > dpkg: error processing package ebtables (--configure): > ... > > > This is due to (with merged /usr): > lrwxrwxrwx 1 root root 18 Apr 6 2022 /sbin/ebtables -> /usr/sbin/ebtables > lrwxrwxrwx 1 root root 26 Apr 6 2022 /sbin/ebtables-restore -> > /usr/sbin/ebtables-restore > lrwxrwxrwx 1 root root 23 Apr 6 2022 /sbin/ebtables-save -> > /usr/sbin/ebtables-save > > > Adding "set -x" in /var/lib/dpkg/info/ebtables.postinst shows: > ... > + LIST=ebtables ebtables-save ebtables-restore > + [ -e /sbin/ebtables ] > + [ -e /sbin/ebtables-save ] > + [ -e /sbin/ebtables-restore ] > + [ configure = configure ] > ... > > Using -h instead of -e works: > ... > + LIST=ebtables ebtables-save ebtables-restore > + [ -h /sbin/ebtables ] > + readlink /sbin/ebtables > + [ /usr/sbin/ebtables = /usr/sbin/ebtables ] > + rm /sbin/ebtables > + [ -h /sbin/ebtables-save ] > + readlink /sbin/ebtables-save > + [ /usr/sbin/ebtables-save = /usr/sbin/ebtables-save ] > + rm /sbin/ebtables-save > + [ -h /sbin/ebtables-restore ] > + readlink /sbin/ebtables-restore > + [ /usr/sbin/ebtables-restore = /usr/sbin/ebtables-restore ] > + rm /sbin/ebtables-restore > + [ configure = configure ] > ...
Thanks for the report. I've no objection to changing the `-e` test to `-h`, but I should like to understand what is going wrong, and I haven't been able to reproduce it. I believe that the postinst `-e` tests ought only to fail if the sym-links are broken. In conjunction with the fact that update-alternatives was complaining about not being able to stat /usr/sbin/ebtables, this suggests to me that the failing tests are symptomatic of another underlying problem. Given that the postinst script was trying and failing to remove existing sym-links, I take it that you already had ebtables installed and were upgrading to 2.0.11-5. Here's what I see in after initially installing ebtables (2.0.11-4+b1) in a Bullseye chroot without merged /usr: $ ls -l /etc/alternatives/ebtables* /sbin/ebtables* /usr/sbin/ebtables* lrwxrwxrwx 1 root root 25 Feb 26 09:14 /etc/alternatives/ebtables -> /usr/sbin/ebtables-legacy* lrwxrwxrwx 1 root root 33 Feb 26 09:14 /etc/alternatives/ebtables-restore -> /usr/sbin/ebtables-legacy-restore* lrwxrwxrwx 1 root root 30 Feb 26 09:14 /etc/alternatives/ebtables-save -> /usr/sbin/ebtables-legacy-save* lrwxrwxrwx 1 root root 18 Feb 26 09:14 /sbin/ebtables -> /usr/sbin/ebtables* lrwxrwxrwx 1 root root 26 Feb 26 09:14 /sbin/ebtables-restore -> /usr/sbin/ebtables-restore* lrwxrwxrwx 1 root root 23 Feb 26 09:14 /sbin/ebtables-save -> /usr/sbin/ebtables-save* lrwxrwxrwx 1 root root 26 Feb 26 09:14 /usr/sbin/ebtables -> /etc/alternatives/ebtables* -rwxr-xr-x 1 root root 14600 Jun 6 2020 /usr/sbin/ebtables-legacy* -rwxr-xr-x 1 root root 14784 Jun 6 2020 /usr/sbin/ebtables-legacy-restore* -rwxr-xr-x 1 root root 1677 Jun 6 2020 /usr/sbin/ebtables-legacy-save* lrwxrwxrwx 1 root root 34 Feb 26 09:14 /usr/sbin/ebtables-restore -> /etc/alternatives/ebtables-restore* lrwxrwxrwx 1 root root 31 Feb 26 09:14 /usr/sbin/ebtables-save -> /etc/alternatives/ebtables-save* -rwxr-xr-x 1 root root 14800 Jun 6 2020 /usr/sbin/ebtablesd* -rwxr-xr-x 1 root root 14672 Jun 6 2020 /usr/sbin/ebtablesu* This includes the three sym-links from /sbin to /usr/sbin you list above and they resolve correctly. For example: * /sbin/ebtables -> /usr/sbin/ebtables * /usr/sbin/ebtables -> /etc/alternatives/ebtables * /etc/alternatives/ebtables -> /usr/sbin/ebtables-legacy With merged /usr (whether by creating the chroot with `debootstrap --merged-usr`, installing the usrmerge package before installing ebtables, or installing usrmerge after ebtables), I see the following: $ ls -l /etc/alternatives/ebtables* /sbin /sbin/ebtables* /usr/sbin/ebtables* lrwxrwxrwx 1 root root 25 Feb 26 09:14 /etc/alternatives/ebtables -> /usr/sbin/ebtables-legacy* lrwxrwxrwx 1 root root 33 Feb 26 09:14 /etc/alternatives/ebtables-restore -> /usr/sbin/ebtables-legacy-restore* lrwxrwxrwx 1 root root 30 Feb 26 09:14 /etc/alternatives/ebtables-save -> /usr/sbin/ebtables-legacy-save* lrwxrwxrwx 1 root root 8 Feb 26 09:17 /sbin -> usr/sbin/ lrwxrwxrwx 1 root root 26 Feb 26 09:14 /sbin/ebtables -> /etc/alternatives/ebtables* -rwxr-xr-x 1 root root 14600 Jun 6 2020 /sbin/ebtables-legacy* -rwxr-xr-x 1 root root 14784 Jun 6 2020 /sbin/ebtables-legacy-restore* -rwxr-xr-x 1 root root 1677 Jun 6 2020 /sbin/ebtables-legacy-save* lrwxrwxrwx 1 root root 34 Feb 26 09:14 /sbin/ebtables-restore -> /etc/alternatives/ebtables-restore* lrwxrwxrwx 1 root root 31 Feb 26 09:14 /sbin/ebtables-save -> /etc/alternatives/ebtables-save* -rwxr-xr-x 1 root root 14800 Jun 6 2020 /sbin/ebtablesd* -rwxr-xr-x 1 root root 14672 Jun 6 2020 /sbin/ebtablesu* lrwxrwxrwx 1 root root 26 Feb 26 09:14 /usr/sbin/ebtables -> /etc/alternatives/ebtables* -rwxr-xr-x 1 root root 14600 Jun 6 2020 /usr/sbin/ebtables-legacy* -rwxr-xr-x 1 root root 14784 Jun 6 2020 /usr/sbin/ebtables-legacy-restore* -rwxr-xr-x 1 root root 1677 Jun 6 2020 /usr/sbin/ebtables-legacy-save* lrwxrwxrwx 1 root root 34 Feb 26 09:14 /usr/sbin/ebtables-restore -> /etc/alternatives/ebtables-restore* lrwxrwxrwx 1 root root 31 Feb 26 09:14 /usr/sbin/ebtables-save -> /etc/alternatives/ebtables-save* -rwxr-xr-x 1 root root 14800 Jun 6 2020 /usr/sbin/ebtablesd* -rwxr-xr-x 1 root root 14672 Jun 6 2020 /usr/sbin/ebtablesu* The three sym-links no longer exist, of course, because /sbin is itself a symlink, so instead we have: * /sbin/ebtables -> /etc/alternatives/ebtables * /etc/alternatives/ebtables -> /usr/sbin/ebtables-legacy and: * /usr/sbin/ebtables -> /etc/alternatives/ebtables * /etc/alternatives/ebtables -> /usr/sbin/ebtables-legacy which again resolve correctly. When I upgrade to Bookworm, everything is still correct: $ ls -l /etc/alternatives/ebtables* /sbin /sbin/ebtables* /usr/sbin/ebtables* lrwxrwxrwx 1 root root 25 Feb 26 09:52 /etc/alternatives/ebtables -> /usr/sbin/ebtables-legacy* lrwxrwxrwx 1 root root 33 Feb 26 09:52 /etc/alternatives/ebtables-restore -> /usr/sbin/ebtables-legacy-restore* lrwxrwxrwx 1 root root 30 Feb 26 09:52 /etc/alternatives/ebtables-save -> /usr/sbin/ebtables-legacy-save* lrwxrwxrwx 1 root root 8 Feb 26 09:54 /sbin -> usr/sbin/ lrwxrwxrwx 1 root root 26 Feb 26 09:52 /sbin/ebtables -> /etc/alternatives/ebtables* -rwxr-xr-x 1 root root 14680 Apr 6 2022 /sbin/ebtables-legacy* -rwxr-xr-x 1 root root 14872 Apr 6 2022 /sbin/ebtables-legacy-restore* -rwxr-xr-x 1 root root 1677 Apr 6 2022 /sbin/ebtables-legacy-save* lrwxrwxrwx 1 root root 34 Feb 26 09:52 /sbin/ebtables-restore -> /etc/alternatives/ebtables-restore* lrwxrwxrwx 1 root root 31 Feb 26 09:52 /sbin/ebtables-save -> /etc/alternatives/ebtables-save* -rwxr-xr-x 1 root root 14880 Apr 6 2022 /sbin/ebtablesd* -rwxr-xr-x 1 root root 14752 Apr 6 2022 /sbin/ebtablesu* lrwxrwxrwx 1 root root 26 Feb 26 09:52 /usr/sbin/ebtables -> /etc/alternatives/ebtables* -rwxr-xr-x 1 root root 14680 Apr 6 2022 /usr/sbin/ebtables-legacy* -rwxr-xr-x 1 root root 14872 Apr 6 2022 /usr/sbin/ebtables-legacy-restore* -rwxr-xr-x 1 root root 1677 Apr 6 2022 /usr/sbin/ebtables-legacy-save* lrwxrwxrwx 1 root root 34 Feb 26 09:52 /usr/sbin/ebtables-restore -> /etc/alternatives/ebtables-restore* lrwxrwxrwx 1 root root 31 Feb 26 09:52 /usr/sbin/ebtables-save -> /etc/alternatives/ebtables-save* -rwxr-xr-x 1 root root 14880 Apr 6 2022 /usr/sbin/ebtablesd* -rwxr-xr-x 1 root root 14752 Apr 6 2022 /usr/sbin/ebtablesu* I've also tried a number of other permutations (upgrading from Bullseye to Bookworm without merged /usr, starting from Buster), and they all worked too. J.
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