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