diff options
Diffstat (limited to 'cloudinit/sources/DataSourceOpenNebula.py')
| -rw-r--r-- | cloudinit/sources/DataSourceOpenNebula.py | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/cloudinit/sources/DataSourceOpenNebula.py b/cloudinit/sources/DataSourceOpenNebula.py index 1622a66e..a50b0c10 100644 --- a/cloudinit/sources/DataSourceOpenNebula.py +++ b/cloudinit/sources/DataSourceOpenNebula.py @@ -167,10 +167,24 @@ def read_context_disk_dir(source_dir): } if "context.sh" in found: - # let bash process the contextualization script; - # write out data in normalized output NAME=\$?'?VALUE'? - # TODO: don't trust context.sh! parse manually !!! try: + # Note: context.sh is a "shell" script with defined context + # variables, like: X="Y" . It's ready to use as a shell source + # e.g.: ". context.sh" and as a shell script it can also reference + # to already defined shell variables. So to have same context var. + # values as we can have in custom shell script, we use bash itself + # to read context.sh and dump variables in easily parsable way. + # + # normalized variables dump format (get by cmd "set"): + # 1. simple single word assignment ........ X=Y + # 2. multiword assignment ................. X='Y Z' + # 3. assignments with backslash escapes ... X=$'Y\nZ' + # + # how context variables are read: + # 1. list existing ("old") shell variables and store into $VARS + # 2. read context variables + # 3. use comm to filter "old" variables from all current + # variables and excl. few other vars with grep BASH_CMD='VARS=`set | sort -u `;' \ '. %s/context.sh;' \ 'comm -23 <(set | sort -u) <(echo "$VARS") | egrep -v "^(VARS|PIPESTATUS|_)="' |