dracut [PATCH] Parameter expansion occurs before command evaluation.

dracut [PATCH] Parameter expansion occurs before command evaluation.

[John Reiser]

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Bash shell expands all ${parameter} before evaluating a command.
For multiple declarations and assignments within the same 'local' command,
then new variables or new values that appear towards the left
do not affect parameter expansion towards the right.

-- 
John Reiser, jreiser-L8/tzxVKHrlWk0Htik3J/w@public.gmane.org

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From 507ad6f66fc66f868a9e5fdd3806e012c4022baa Mon Sep 17 00:00:00 2001
From: John Reiser <jreiser-L8/tzxVKHrlWk0Htik3J/w@public.gmane.org>
Date: Fri, 23 Sep 2011 07:37:43 -0700
Subject: [PATCH] Parameter expansion occurs before command evaluation.

${parameter} on the right is expanded before evaluating "local var=value"
on the left.

---
 dracut-functions |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/dracut-functions b/dracut-functions
index 5508809..c4f7f61 100755
--- a/dracut-functions
+++ b/dracut-functions
@@ -272,7 +272,7 @@ check_vol_slaves() {
 inst_dir() {
     [[ -e ${initdir}"$1" ]] && return 0  # already there
 
-    local _dir="$1" _part=${_dir%/*} _file
+    local _dir="$1" _part="${1%/*}" _file
     while [[ "$_part" != "${_part%/*}" ]] && ! [[ -e "${initdir}${_part}" ]]; do
         _dir="$_part $_dir"
         _part=${_part%/*}
-- 
1.7.6

Re: dracut [PATCH] Parameter expansion occurs before command evaluation.

[Harald Hoyer]

On 23.09.2011 17:02, John Reiser wrote:
> Bash shell expands all ${parameter} before evaluating a command.
> For multiple declarations and assignments within the same 'local' command,
> then new variables or new values that appear towards the left
> do not affect parameter expansion towards the right.
> 


pushed to temporary http://git.surfsite.org/dracut.git

Thanks!