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Document lineinfile regexp gotcha (#47912)

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You typically want the lineinfile module to operate in an indempotent way, similar to using "sed -i", so your regexp needs to match the line to edit both before and after the edit, otherwise on a second run the regexp will no longer match the original text line and you will end up with a second copy of the replacement line at the top/bottom of the file.
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jfpanisset 2018-11-01 07:38:45 -07:00 committed by Sam Doran
parent 23becece53
commit 1814af9f34
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lib/ansible/modules/files/lineinfile.py
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@ -48,6 +48,8 @@ options:
- If the regular expression is not matched, the line will be - If the regular expression is not matched, the line will be
added to the file in keeping with`insertbefore` or `insertafter` added to the file in keeping with`insertbefore` or `insertafter`
settings. settings.
- When modifying a line the regexp should typically match both the initial state of
the line as well as its state after replacement by C(line) to ensure idempotence.
- Uses Python regular expressions. See U(http://docs.python.org/2/library/re.html). - Uses Python regular expressions. See U(http://docs.python.org/2/library/re.html).
version_added: '1.7' version_added: '1.7'
state: state: