Package: mmdebstrap
Version: 0.7.5-2.2
Severity: minor
mmdebstrap's approx_disk_usage calls File::Find find(), which
for some reason cares about the permissions of $PWD.
This is the case even when writing the .ext2 somewhere else.
bash5$ mkdir /tmp/a
bash5$ cd /tmp/a
bash5$ mmdebstrap sid /tmp/b.ext2 --quiet
copying from tar archive -
copying from tar archive -
bash5$ ls -lh /tmp/b.ext2
-rw-r--r-- 1 twb twb 306M 2022-02-16 16:11 /tmp/b.ext2
bash5$ chmod 0700 .
bash5$ pwd
/tmp/a
bash5$ mmdebstrap sid /tmp/b.ext2 --quiet
copying from tar archive -
Can't cd to /tmp/a: Permission denied
Use of uninitialized value $numblocks in chomp at /usr/bin/mmdebstrap line
5607.
Use of uninitialized value $numblocks in numeric le (<=) at
/usr/bin/mmdebstrap line 5636.
Use of uninitialized value $numblocks in concatenation (.) or string at
/usr/bin/mmdebstrap line 5637.
bash5$ ls -lh /tmp/b.ext2
-rw-r--r-- 1 twb twb 0 2022-02-16 16:12 /tmp/b.ext2
It looks like File::Find has a "no_chdir" argument.
Maybe you just need to pass that?
https://sources.debian.org/src/perl/5.34.0-3/ext/File-Find/lib/File/Find.pm/#L282
https://sources.debian.org/src/perl/5.34.0-3/ext/File-Find/lib/File/Find.pm/#L273
I guess this is happening because approx_disk_usage runs inside an unshare(2)'d
context.
So the other option might be to shuffle things around so it runs with full
privileged.
But that is probably deeply painful and messy.
I would be happy with just having an earlier error message (i.e. before apt),
like
if (!$options->{dryrun} && $format eq 'ext2')
if( <$PWD is not at least 0555> )
die "ext2 output needs world-read/execute permissions on $PWD";
-- System Information:
Debian Release: 11.2
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500,
'proposed-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 5.14.0-0.bpo.2-amd64 (SMP w/8 CPU threads)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE,
TAINT_UNSIGNED_MODULE
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages mmdebstrap depends on:
ii apt 2.2.4
ii perl 5.32.1-4+deb11u2
ii python3 3.9.2-3
Versions of packages mmdebstrap recommends:
ii arch-test 0.17-1
ii fakechroot 2.19-3.3
ii fakeroot 1.25.3-1.1
ii gpg 2.2.27-2
ii libdistro-info-perl 1.0
ii mount 2.36.1-8+deb11u1
ii uidmap 1:4.8.1-1
Versions of packages mmdebstrap suggests:
ii apt [apt-transport-https] 2.2.4
pn apt-transport-tor <none>
pn apt-utils <none>
ii binfmt-support 2.2.1-1
ii ca-certificates 20210119
ii debootstrap 1.0.123
ii distro-info-data 0.51+deb11u1
ii dpkg-dev 1.20.9
ii perl-doc 5.32.1-4+deb11u2
pn proot <none>
ii qemu-user 1:5.2+dfsg-11+deb11u1
ii qemu-user-static 1:5.2+dfsg-11+deb11u1
ii squashfs-tools-ng 1.0.4-1
-- no debconf information
