mmdebstrap/tests/taridshift-utility

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#!/bin/sh
set -eu
export LC_ALL=C.UTF-8
if [ ! -e /mmdebstrap-testenv ]; then
echo "this test modifies the system and should only be run inside a container" >&2
exit 1
fi
adduser --gecos user --disabled-password user
echo user:100000:65536 | cmp /etc/subuid -
echo user:100000:65536 | cmp /etc/subgid -
sysctl -w kernel.unprivileged_userns_clone=1
# include iputils-ping so that we can verify that taridshift does not remove
# extended attributes
# run through tarshift no-op to create a tarball that should be bit-by-bit
# identical to a round trip through "taridshift X" and "taridshift -X"
runuser -u user -- {{ CMD }} --mode=unshare --variant=apt --include=iputils-ping {{ DIST }} - {{ MIRROR }} \
| ./taridshift 0 > /tmp/debian-chroot.tar
# make sure that xattrs are set in the original tarball
mkdir /tmp/debian-chroot
tar --xattrs --xattrs-include='*' --directory /tmp/debian-chroot -xf /tmp/debian-chroot.tar ./bin/ping
echo "/tmp/debian-chroot/bin/ping cap_net_raw=ep" > /tmp/expected
getcap /tmp/debian-chroot/bin/ping | diff -u /tmp/expected -
rm /tmp/debian-chroot/bin/ping
rmdir /tmp/debian-chroot/bin
rmdir /tmp/debian-chroot
# shift the uid/gid forward by 100000 and backward by 100000
./taridshift 100000 < /tmp/debian-chroot.tar > /tmp/debian-chroot-shifted.tar
./taridshift -100000 < /tmp/debian-chroot-shifted.tar > /tmp/debian-chroot-shiftedback.tar
# the tarball before and after the roundtrip through taridshift should be bit
# by bit identical
cmp /tmp/debian-chroot.tar /tmp/debian-chroot-shiftedback.tar
# manually adjust uid/gid and compare "tar -t" output
tar --numeric-owner -tvf /tmp/debian-chroot.tar \
| sed 's# 100/0 # 100100/100000 #' \
| sed 's# 100/8 # 100100/100008 #' \
| sed 's# 0/0 # 100000/100000 #' \
| sed 's# 0/5 # 100000/100005 #' \
| sed 's# 0/8 # 100000/100008 #' \
| sed 's# 0/42 # 100000/100042 #' \
| sed 's# 0/43 # 100000/100043 #' \
| sed 's# 0/50 # 100000/100050 #' \
| sed 's/ \+/ /g' \
> /tmp/debian-chroot.txt
tar --numeric-owner -tvf /tmp/debian-chroot-shifted.tar \
| sed 's/ \+/ /g' \
| diff -u /tmp/debian-chroot.txt -
mkdir /tmp/debian-chroot
tar --xattrs --xattrs-include='*' --directory /tmp/debian-chroot -xf /tmp/debian-chroot-shifted.tar
echo "100000 100000" > /tmp/expected
stat --format="%u %g" /tmp/debian-chroot/bin/ping | diff -u /tmp/expected -
echo "/tmp/debian-chroot/bin/ping cap_net_raw=ep" > /tmp/expected
getcap /tmp/debian-chroot/bin/ping | diff -u /tmp/expected -
echo "0 0" > /tmp/expected
runuser -u user -- {{ CMD }} --unshare-helper /usr/sbin/chroot /tmp/debian-chroot stat --format="%u %g" /bin/ping \
| diff -u /tmp/expected -
echo "/bin/ping cap_net_raw=ep" > /tmp/expected
runuser -u user -- {{ CMD }} --unshare-helper /usr/sbin/chroot /tmp/debian-chroot getcap /bin/ping \
| diff -u /tmp/expected -
rm /tmp/debian-chroot.tar /tmp/debian-chroot-shifted.tar /tmp/debian-chroot.txt /tmp/debian-chroot-shiftedback.tar /tmp/expected
rm -r /tmp/debian-chroot