Notes on portability, and on when #include <linux/blah> is appropriate.

[oweals/busybox.git] / examples / undeb

diff --git a/examples/undeb b/examples/undeb
index fa2bcb34c5ed7c2f9ec815601cdf9d39cd90c93d..37104e9d813e0990b11810b658541beb414548b5 100644 (file)
--- a/examples/undeb
+++ b/examples/undeb
@@ -1,15 +1,19 @@
 #!/bin/sh
 #
+# This should work with the GNU version of tar and gzip!
+# This should work with the bash or ash shell!
+# Requires the programs (ar, tar, gzip, and the pager more or less).
+#
 usage() {
 echo "Usage: undeb -c package.deb            <Print control file info>"
 echo "       undeb -l package.deb            <List contents of deb package>"
 echo "       undeb -x package.deb /foo/boo   <Extract deb package to this directory,"
-echo "                                        put . for current directory>"  
+echo "                                        put . for current directory>"
 exit
 }
 
 deb=$2
- 
+
 exist() {
 if [ "$deb" = "" ]; then
 usage
@@ -25,12 +29,12 @@ elif [ "$1" = "-l" ]; then
 exist
 type more >/dev/null 2>&1 && pager=more
 type less >/dev/null 2>&1 && pager=less
-trap "" 13
-(ar -p $deb control.tar.gz | gunzip -c | tar -x -O control ; echo -e "\nPress enter to scroll, q to Quit!\n" ; ar -p $deb data.tar.gz | gunzip -c | tar -t -v 2>/dev/null) | $pager 
+[ "$pager" = "" ] && echo "No pager found!" && exit
+(ar -p $deb control.tar.gz | tar -xzO *control ; echo -e "\nPress enter to scroll, q to Quit!\n" ; ar -p $deb data.tar.gz | tar -tzv) | $pager
 exit
 elif [ "$1" = "-c" ]; then
 exist
-ar -p $deb control.tar.gz | gunzip -c | tar -x -O control  
+ar -p $deb control.tar.gz | tar -xzO *control
 exit
 elif [ "$1" = "-x" ]; then
 exist
@@ -40,7 +44,7 @@ elif [ ! -d "$3" ]; then
 echo "No such directory $3!"
 exit
 fi
-ar -p $deb data.tar.gz | gunzip | (cd $3 ; tar -x -v -f -) || exit 
+ar -p $deb data.tar.gz | tar -xzvpf - -C $3 || exit
 echo
 echo "Extracted $deb to $3!"
 exit