Hi All,

Following is the script to copy all libraries of a certain command to make my chroot environment.

For example:

./cplb.sh /bin/ls will copy all the libraries of ls command (i.e., the files listed by "ldd /bin/ls" command )

cplb.sh

CHROOT='/var/chroot'
mkdir $CHROOT

for i in $( ldd $* |cut -d " " -f3 |sort |uniq)
do
cp --parents $i $CHROOT
done

echo "Chroot jail is ready. To access it execute: chroot $CHROOT"

Now, when i run ./cplb.sh /bin/ls it works like a charm. But when i run it for multiple commands at the same time, for example..

./cplb.sh /bin/{ls,cat}

it throws an error saying

cannot stat : '/bin/ls:' file or dir not found
cannot stat : '/bin/cat:' file or dir not found

I can see a colon after the command, i.e., /bin/ls: and that colon causes the error. Now, where does it come from and how to resolve this, so that I can run the script for multiple commands at the same time.

Thanks in advance.

Cheers,
Gokul

Linux poses a real challenge for those with a taste for late-night hacking (and/or conversations with God)

This is what the output of ldd /bin/ls /bin/cat might look like:

/bin/ls:
linux-vdso.so.1 (0x00007fffd25df000)
libcap.so.2 => /usr/lib/libcap.so.2 (0x00007f28f8d09000)
libacl.so.1 => /usr/lib/libacl.so.1 (0x00007f28f8b00000)
libc.so.6 => /usr/lib/libc.so.6 (0x00007f28f8753000)
libattr.so.1 => /usr/lib/libattr.so.1 (0x00007f28f854e000)
/lib64/ld-linux-x86-64.so.2 (0x00007f28f8f0d000)
/bin/cat:
linux-vdso.so.1 (0x00007ffff9dfe000)
libc.so.6 => /usr/lib/libc.so.6 (0x00007fc44208a000)
/lib64/ld-linux-x86-64.so.2 (0x00007fc442437000)

Tried the following instead:

ldd "$@" | cut -d' ' -f3 | sort -u | grep -v ':$' |
while read i
do
cp --parents $i $CHROOT
done

Above, we use grep to remove the /bin/ls: and /bin/cat: lines.

The piping-to-loop style is a bit more idiomatic. sort usually has a -u option to remove duplicates. It's generally preferable to use "$@" instead of $* as that will expand to filenames with spaces and special characters correctly.

Would be great if someone could help me with the following question.....

The script copies the libraries alone, whereas it doesn't copies the command itself. I mean, if i run the following command..
./cplb.sh /bin/ls -- here it copies the libraries of ls, whereas it doesn't copy the command /bin/ls. I tried adding few lines to the actual script, the output of which is not as expected. Can you please tell me what should be added to the existing script so that it copies the command also. Thanks in advance.

Probably just add
PS please use [CODE][/CODE] around code.

Finally i got that right. Thanks.

ldd "$@" | cut -d' ' -f3 | sort -u | grep -v ':$' |
while read i
do
cp --parents "$i" "$CHROOT"
done
cp --parents "$@" "$CHROOT"