Using the abbreviated version of the Github commit sha in current version of CircleCI

Build Environment
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1

Is there a working way to get a shortened version of the commit sha when using $CIRCLE_SHA1? I’m attempting to change our Slack notifications to include the sha but the full 40 character sha is a bit obnoxious - the goal is to have it look similar to the Slack GIthub app’s notifications that include the abbreviated sha and a link to the commit.

2

Hey @asnider93

BASH substrings are useful for this

${str:position:length}

Example:

❯ SHA=$(git rev-parse HEAD)
❯ SHORTSHA="${SHA:0:7}"
❯ echo $SHORTSHA
0b18930
3

It is important to note that if you need the “official” short commit hash, its length may vary, depending on what git requires to guarantee its uniqueness. so git rev-parse --short is the thing to use if you care about consistency with other tools (unless they’re also hard-coding it).