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Do not unconditionally read standard input

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mmdebstrap used to attempt reading stdin if it was not a tty. This leads
to unexpected behaviour when mmdebstrap is used through ssh without a
pseudo-terminal allocated like so:

    $ ssh remote mmdebstrap unstable /output/dir http://mirror

This will stall forever, waiting for data on standard input. Or
consider:

    $ ssh remote << END
    > somecommand
    > mmdebstrap unstable /output/dir http://mirror
    > othercommand
    END

This will make mmdebstrap read "othercommand" and everything that
follows as a sources.list entry. To prevent this unexpected behaviour,
the following ways to use mmdebstrap will not be supported anymore:

    $ mmdebstrap unstable /output/dir < sources.list
    $ mmdebstrap unstable /output/dir http://mirror < sources.list

Instead, one must now explicitly pass "-" if one wants mmdebstrap to
read from stdin:

    $ mmdebstrap unstable /output/dir - < sources.list
    $ mmdebstrap unstable /output/dir http://mirror - < sources.list
This commit is contained in:
Johannes 'josch' Schauer 2019-08-28 00:53:04 +02:00
parent 1219a65723
commit a921e32e6c
Signed by untrusted user: josch
GPG key ID: F2CBA5C78FBD83E1
2 changed files with 24 additions and 42 deletions
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5
coverage.sh
View file

@ -550,12 +550,13 @@ else
./run_null.sh
fi
print_header "mode=$defaultmode,variant=apt: no mirror but data on stdin"
print_header "mode=$defaultmode,variant=apt: automatic mirror from suite"
cat << END > shared/test.sh
#!/bin/sh
set -eu
export LC_ALL=C.UTF-8
echo "deb $mirror $DEFAULT_DIST main" | $CMD --mode=$defaultmode --variant=apt $DEFAULT_DIST /tmp/debian-chroot.tar
echo "127.0.0.1 deb.debian.org" >> /etc/hosts
$CMD --mode=$defaultmode --variant=apt $DEFAULT_DIST /tmp/debian-chroot.tar
tar -tf /tmp/debian-chroot.tar | sort | diff -u tar1.txt -
rm /tmp/debian-chroot.tar
END

61
mmdebstrap
View file

@ -1998,23 +1998,17 @@ sub main() {
}
my $sourceslist = '';
my $stdindata = '';
# make sure that we only attempt to read from STDIN if it's *not*
# connected to the terminal (because we don't expect the user to type
# the sources.list file
if (! -t STDIN) {
info "Reading sources.list from standard input...";
$stdindata = do { local $/; <STDIN> };
}
if (! defined $suite) {
# If no suite was specified, then the whole sources.list has to
# come from standard input
$sourceslist .= $stdindata;
info "Reading sources.list from standard input...";
$sourceslist = do { local $/; <STDIN> };
} else {
if (scalar @ARGV > 0) {
for my $arg (@ARGV) {
if ($arg eq '-') {
$sourceslist .= $stdindata;
info "Reading sources.list from standard input...";
$sourceslist .= do { local $/; <STDIN> };
} elsif ($arg =~ /^deb(-src)? /) {
$sourceslist .= "$arg\n";
} elsif ($arg =~ /:\/\//) {
@ -2029,15 +2023,6 @@ sub main() {
error "invalid mirror: $arg";
}
}
# if there was no explicit '-' mirror listed and something was
# read on standard input, then just append it to the end
if (none { $_ eq '-' } @ARGV) {
# if nothing was read on standard input then nothing will
# be appended
$sourceslist .= $stdindata;
}
} elsif ($stdindata ne '') {
$sourceslist .= $stdindata;
} else {
# FIXME: change default mirror depending on $suite
# (for derivatives)
@ -2465,27 +2450,23 @@ section B<DEBOOTSTRAP>). In contrast to debootstrap it uses apt to resolve
dependencies and is thus able to use more than one mirror and resolve more
complex dependencies.
If no I<MIRROR> option is provided, L<http://deb.debian.org/debian> is used,
except if data was given on standard input in which case the lines read from
there are used as the content of the chroot's sources.list file. If I<SUITE>
is a stable release name and no I<MIRROR> is specified, then mirrors for
updates and security are automatically added. If a I<MIRROR> option starts
with "deb " or "deb-src " then it is used as a one-line-style format entry for
apt's sources.list inside the chroot. If a I<MIRROR> option contains a "://"
then it is interpreted as a mirror URI and the apt line inside the chroot is
assembled as "deb [arch=A] B C D" where A is the host's native architecture, B
is the I<MIRROR>, C is the given I<SUITE> and D is the components given via
B<--components> (defaults to "main"). If a I<MIRROR> option happens to be an
existing file, then its contents are pasted into the chroot's sources.list.
This can be used to supply a deb822 style sources.list. If I<MIRROR> is C<->
then standard input is pasted into the chroot's sources.list. If there was
data on standard input but no C<-> mirror was listed, the lines read from
standard input will be appended to the end of the chroot's sources.list. More
than one mirror can be specified and are appended to the chroot's sources.list
in the given order. If any mirror contains a https URI, then the packages
apt-transport-https and ca-certificates will be installed inside the chroot.
If any mirror contains a tor+xxx URI, then the apt-transport-tor package will
be installed inside the chroot.
If no I<MIRROR> option is provided, L<http://deb.debian.org/debian> is used.
If I<SUITE> is a stable release name and no I<MIRROR> is specified, then
mirrors for updates and security are automatically added. If a I<MIRROR>
option starts with "deb " or "deb-src " then it is used as a one-line-style
format entry for apt's sources.list inside the chroot. If a I<MIRROR> option
contains a "://" then it is interpreted as a mirror URI and the apt line
inside the chroot is assembled as "deb [arch=A] B C D" where A is the host's
native architecture, B is the I<MIRROR>, C is the given I<SUITE> and D is the
components given via B<--components> (defaults to "main"). If a I<MIRROR>
option happens to be an existing file, then its contents are pasted into the
chroot's sources.list. This can be used to supply a deb822 style
sources.list. If I<MIRROR> is C<-> then standard input is pasted into the
chroot's sources.list. More than one mirror can be specified and are appended
to the chroot's sources.list in the given order. If any mirror contains a
https URI, then the packages apt-transport-https and ca-certificates will be
installed inside the chroot. If any mirror contains a tor+xxx URI, then the
apt-transport-tor package will be installed inside the chroot.
The optional I<TARGET> argument can either be the path to a directory, the
path to a tarball filename or C<->. If I<TARGET> ends with C<.tar>, or with