cpio terminates prematurely if its output is piped through head:
using cpio-2.9-75.45
cpio -idv './usr/include/*' 'usr/include/*' <$a 2>&1
... fully unpacks the archive $a
cpio -idv './usr/include/*' 'usr/include/*' <$a 2>&1 | head
... unpacks apparently non-deterministically just some but not all files
of arcive $a
> find ./usr >files$i.lis
> ls -l files*.lis
-rw-r--r-- 1 elm users 884 9. Mai 10:54 files10.lis
-rw-r--r-- 1 elm users 884 9. Mai 10:54 files1.lis
-rw-r--r-- 1 elm users 3896 9. Mai 10:54 files2.lis
-rw-r--r-- 1 elm users 4933 9. Mai 10:54 files3.lis
-rw-r--r-- 1 elm users 5271 9. Mai 10:54 files4.lis
-rw-r--r-- 1 elm users 5370 9. Mai 10:54 files5.lis
-rw-r--r-- 1 elm users 6248 9. Mai 10:54 files6.lis
-rw-r--r-- 1 elm users 884 9. Mai 10:54 files7.lis
-rw-r--r-- 1 elm users 847 9. Mai 10:54 files8.lis
-rw-r--r-- 1 elm users 884 9. Mai 10:54 files9.lis
-rw-r--r-- 1 elm users 58170 9. Mai 10:54 files.lis
very strange!!
get the cpio:
wget_http://ftp.hosteurope.de/mirror/ftp.opensuse.org/discontinued/10.0/suse/x86_64/glibc-devel-2.3.5-40.x86_64.rpm
rpm2cpio_glibc-devel-2.3.5-40.x86_64.rpm_>glibc-devel-2.3.5-40.x86_64.cpio
attachement: full program creating files*.lis
In general a program should not be influenced by the fact how its
output is used (whether piped to head or outputted directly). Most
likely cpio just does not handle some error condition (output file
descriptor closed by other party). However then it is perhaps a bug of
head, because head should not disrupt its pipe antecessors by closing
its file descriptor prematurely.
Perhaps this is even a general kernel related issue occurring with the
usage of other coreutils as well, in the way that the other end of a
pipe should never panic if a consumer finishes (rather behave like
piping to /dev/zero on from the point where the filedesc is closed by
the consumer).
#!/bin/bash
unpack() {
echo "${braun}unpacking glibc-devel cpio ....${nv}"
cpio -idv './usr/include/*' 'usr/include/*' <glibc-devel-*.cpio
find ./usr >files.lis
for i in $(seq 10); do
rm -fr ./usr
for a in glibc-devel-*.cpio; do
echo "${braun} cpio -idv './usr/include/*' <$...@]}${grau}"
cpio -idv './usr/include/*' 'usr/include/*' <$a 2>&1 | head
# cpio | head: entpackt manchmal manche Dateien nicht
done
find ./usr >files$i.lis
cmp files$i.lis files.lis || echo -n "${rot}archive not correctly unpacked
in run #$i !!{nv}"
done
}
{
unpack
} 9>/dev/null
echo;echo
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