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authorBoris Kolpackov <boris@codesynthesis.com>2018-12-03 12:56:13 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2018-12-03 12:56:13 +0200
commitbd6b54e904485783cb0352483798609b6822ad91 (patch)
tree639e88d35c2d0d9fd2fe770a466b0d0bd08a0cd1 /pxeflatten
parent486b030b576df48d2600552a4a519454e49fb091 (diff)
Improve pxeflatten script to support combining multiple files
Diffstat (limited to 'pxeflatten')
-rwxr-xr-xpxeflatten43
1 files changed, 36 insertions, 7 deletions
diff --git a/pxeflatten b/pxeflatten
index cb80218..78a5c84 100755
--- a/pxeflatten
+++ b/pxeflatten
@@ -6,17 +6,22 @@
# must all be on a single line. There is no support even for line
# continuation. This makes managing complex configurations a pain.
#
-# To help with this situation, this script will take a milt-line file (or
+# To help with this situation, this script will take a milti-line file (or
# stdin if none is specified) and write flattened, single line output into
# stdout ignoring #-comments and blank lines while at it.
#
# If you have prepared your PXELINUX config file so that the 'append' clause
-# is the last line without a trailing newline (but with a trailing space),
+# is the last line without a trailing newline (and without a trailing space),
# then you can do:
#
# pxeflatten pxeconfig >>pxelinux.cfg/default
#
-usage="usage: $0 [<file>]"
+# Options:
+#
+# -n
+# Don't write trailing newline (useful for appending multiple configs).
+#
+usage="usage: $0 [-n] [<file>]"
owd="$(pwd)"
trap "{ cd '$owd'; exit 1; }" ERR
@@ -25,16 +30,40 @@ set -o errtrace # Trap in functions.
function info () { echo "$*" 1>&2; }
function error () { info "$*"; exit 1; }
+nl=true
+
+while [ "$#" -gt 0 ]; do
+ case "$1" in
+ -n)
+ nl=
+ shift
+ ;;
+ -*)
+ error "unknown option: $1"
+ ;;
+ --)
+ shift
+ break
+ ;;
+ *)
+ break
+ ;;
+ esac
+done
+
if [ -z "$1" ]; then
input="-"
else
input="$1"
fi
-s=
l=
while read l || [ -n "$l" ]; do
- echo -n "$s$l"
- s=" "
+ echo -n " $l"
done < <(sed -e '/^\s*#/d;/^\s*$/d;s/\s\s*/ /g' "$input")
-echo # Final newline.
+
+# Final newline.
+#
+if [ "$nl" ]; then
+ echo
+fi