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author | Boris Kolpackov <boris@codesynthesis.com> | 2017-08-09 10:12:30 +0200 |
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committer | Boris Kolpackov <boris@codesynthesis.com> | 2017-08-09 10:12:30 +0200 |
commit | 90a5772d2466e6443b6fa632b3cb979e4346d22a (patch) | |
tree | 1d583108a094ebffd04e43817c5c3440a58e1878 | |
parent | 2fd87d0c656fb1806b33ef3fcec7e8c7f52779a4 (diff) |
Add pxelinux configuration flattening script
-rwxr-xr-x | pxeflatten | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/pxeflatten b/pxeflatten new file mode 100755 index 0000000..cb80218 --- /dev/null +++ b/pxeflatten @@ -0,0 +1,40 @@ +#! /usr/bin/env bash + +# Flatten a multi-line PXELINUX config file ignoring comments/blank lines. +# +# The text that appears after the 'append' clause in PXELINUX config files +# 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 +# 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), +# then you can do: +# +# pxeflatten pxeconfig >>pxelinux.cfg/default +# +usage="usage: $0 [<file>]" + +owd="$(pwd)" +trap "{ cd '$owd'; exit 1; }" ERR +set -o errtrace # Trap in functions. + +function info () { echo "$*" 1>&2; } +function error () { info "$*"; exit 1; } + +if [ -z "$1" ]; then + input="-" +else + input="$1" +fi + +s= +l= +while read l || [ -n "$l" ]; do + echo -n "$s$l" + s=" " +done < <(sed -e '/^\s*#/d;/^\s*$/d;s/\s\s*/ /g' "$input") +echo # Final newline. |