Patchwork [1/1] make compression tests case-insensitive

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Submitter Tom Zanussi
Date Dec. 30, 2011, 1:29 a.m.
Message ID <>
Download mbox | patch
Permalink /patch/17815/
State Accepted
Commit fe48e55988a2208bb7a3a2cc2bc641c41dbd1cb0
Headers show


Tom Zanussi - Dec. 30, 2011, 1:29 a.m.
From: Tom Zanussi <>

In the script, the output of $COMPRESSION is tested for
certain lowercase strings such as 'xz' in order to determine the
decompression to use.  The problem is that the output strings tested
are from the output of 'file', which uses different cases in different
versions e.g. file-5.09 prints:

tmp/sysroots/x86_64-linux/usr/bin$ ./file xxx.tar.xz: XZ compressed data

while file-5.03 prints:

tmp/sysroots/x86_64-linux/usr/bin$ ./file xxx.tar.xz: xz compressed data

In the former, the XZ string causes xz compressed payloads to
incorrectly fall through to the catch-all lzma case.

Signed-off-by: Tom Zanussi <>
 scripts/ |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)


diff --git a/scripts/ b/scripts/
index 426fd77..5df8c0f 100755
--- a/scripts/
+++ b/scripts/
@@ -27,13 +27,13 @@  o=`expr $o + $hdrsize`
 EXTRACTOR="dd if=$pkg ibs=$o skip=1"
 COMPRESSION=`($EXTRACTOR |file -) 2>/dev/null`
-if echo $COMPRESSION |grep -q gzip; then
+if echo $COMPRESSION |grep -iq gzip; then
-elif echo $COMPRESSION |grep -q bzip2; then
+elif echo $COMPRESSION |grep -iq bzip2; then
-elif echo $COMPRESSION |grep -q xz; then
+elif echo $COMPRESSION |grep -iq xz; then
-elif echo $COMPRESSION |grep -q cpio; then
+elif echo $COMPRESSION |grep -iq cpio; then
 	# Most versions of file don't support LZMA, therefore we assume