tree 4581dc3493883f00abb0c3b61e3576edf1032197
parent efddd79512cc582675004bfdf7e66585198b38f9
author Sally, Gene <Gene.Sally@timesys.com> 1225288457 -0400
committer Sam Ravnborg <sam@ravnborg.org> 1228336323 +0100

kbuild: gen_init_cpio expands shell variables in file names

Modify gen_init_cpio so that lines that specify files can contain
what looks like a shell variable that's expanded during processing.

For example:

   file /sbin/kinit ${RFS_BASE}/usr/src/klibc/kinit/kinit 0755 0 0

given RFS_BASE is "/some/directory" in the environment

would be expanded to

   file /sbin/kinit /some/directory/usr/src/klibc/kinit/kinit 0755 0 0

If several environment variables appear in a line, they are all expanded
with processing happening from left to right.
Undefined variables expand to a null string.
Syntax errors stop processing, letting the existing error handling
show the user offending line.

This patch helps embedded folks who frequently create several
RFS directories and then switch between them as they're tuning
an initramfs.

Signed-off-by: gene.sally@timesys.com
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>