77 lines
2.4 KiB
Markdown
77 lines
2.4 KiB
Markdown
[[!meta title="Find e-mail adresses of people in git log output"]]
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## Motivation
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Some days ago I've replaced **cronwrapper**, a script to monitor output of
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cron scripts with the replacement **cwrap** in local.ch's puppet configuration.
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If the script prints on stdout, **cwrap** does not raise an error by default,
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which **cronwrapper** did.
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To notify every user of the change, I want to send an email to every
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ex-**cronwrapper** user.
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## Solution
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The configuration is stored in a subversion repo, which I locally sync using
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**git svn**. Thus I can use **git log -p** to see all changes.
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A typical line of interest looks like this:
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- command => '/usr/local/bin/cronwrapper.sh EMAIL@EXAMPLE.COM "[mob][low][dev03-sth][front] description" /usr/bin/php /some/script',
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Thanks to git, grep, sed, awk, there is a pretty simple solution
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(not the most beautiful) to this problem. First of all, get all patches:
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git log -p
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Then find all removal entries of cronwrapper:
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grep ^- | grep cronwrapper
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But only those containing an e-mail address:
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grep '@'
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And filter out the e-mail address:
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sed 's/.* \(.*@.*\)/\1/' | awk '{ print $1 }'
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Replace all quotes and backslash quotes:
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sed -e 's/\\"//g' -e 's/"//g' -e "s/'//g"
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The problem now is that some e-mail adresses are indeed multiple e-mail adresses
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(abc@example.com;def@example.com) and some e-mail adresses are lower, some upper case.
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Breaking up the concatenated addresses can be done use awk easily:
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awk '{ gsub(";", "\n"); print $0 }'
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Transforming all addresses to lower case can be done using the fine utility **tr**:
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tr '[A-Z]' '[a-z]'
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Filter out all duplicates:
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sort | uniq
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The result is a list of e-mail addresses. Making them usable for copy & paste
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into webmail of exchange needs another filter to convert **\n** to **;**, but
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add one **\n** at the end:
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awk 'ORS=";" { print $0 } END { ORS="\n"; print "" }'
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So in the end, the complete chanin looks like this:
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git log -p | grep ^- | grep cronwrapper | \
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grep '@' | sed 's/.* \(.*@.*\)/\1/' | awk '{ print $1 }' | \
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sed -e 's/\\"//g' -e 's/"//g' -e "s/'//g" | \
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tr '[A-Z]' '[a-z]' | \
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awk '{ gsub(";", "\n"); print $0 }' | \
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sort | uniq | \
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awk 'ORS=";" { print $0 } END { ORS="\n"; print "" }'
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For me, this is a nice demonstration of the power of shell, unix tools and filtering via pipes.
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[[!tag config sysadmin localch unix]]
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