Hi Josh, Johannes 'josch' Schauer a écrit le 27/10/2020 à 18:45 : > Package: libhdf5-openmpi-dev > Version: 1.10.6+repack-2 > Severity: wishlist > > Hi, > > when installing libhdf5-openmpi-dev in a chroot that doesn't have /proc > mounted, one will get the following error: > > Setting up libhdf5-openmpi-dev (1.10.6+repack-2) ... > /var/lib/dpkg/info/libhdf5-openmpi-dev.postinst: line 56: /dev/fd/63: No such > file or directory > dpkg: error processing package libhdf5-openmpi-dev (--configure): > installed libhdf5-openmpi-dev package post-installation script subprocess > returned error exit status 1 > > The problem is, that the postinst script uses the bash-feature to write: > > while read x; do ... done < <(cmd2 args ...) > > Fortunately, these instances can easily be rewritten as: > > cmd2 args | while read x; do ... done > > Please consider making this change.
Unfortunately it doesn't work this way. Consider this test script:
$ cat test.sh
#!/bin/bash
declare -A foo bar
while read var; do
foo["$var"]="$var"
done < <(seq 1 3)
seq 1 3 | while read var; do
bar["$var"]="$var"
done
echo "foo=${foo[@]}"
echo "bar=${bar[@]}"
$ ./test.sh
foo=3 2 1
bar=
Using a pipe makes variable assignments into the while loop inefficient.
That's why I had to use the process substitution syntax.
Any other idea?
Thanks,
_g.
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