How do I get the output from a call to GIT into a variable in a batch script?

Question

I have a git command to get the latest SHA of the current repo as follows:

git log --pretty=format:"%H" -n 1

I have a windows batch script I'd like to use this in as follows:

SET CURRENT_SHA=???

But I'm at a loss as to how to get the output from that call to git into the variable so that I can make use of it.

Edit

I've tried the following (which seems to be the general advice I've read here and elsewhere):

SETLOCAL ENABLEDELAYEDEXPANSION
FOR /F "tokens=* USEBACKQ" %%i IN (`git log --pretty=format:"%H" -n 1`) DO (SET CURRENT_SHA=%%i)
ECHO Current Sha: %CURRENT_SHA%

..but I get:

fatal: failed to stat 'format:i) ECHO Current Sha: 48bce83e800b96607afb2a387c4fcd7b0b0f037e

So presumably there's a problem with the quotes?

I think you need to double the percent to escape it for %H and then again because its in a batch file. — Duncan
– Duncan, Commented May 3, 2016 at 12:55

Jon Cage · Accepted Answer · 2016-05-03 13:24:40Z

7

I don't have a Windows system handy to test, but I think something along these lines:

FOR /F %i IN (`git log --pretty=format:"%%H" -n 1`) DO SET CURRENT_SHA=%i

Note that the "%H" needs to be escaped, but to use this line in a batch file you also need to double escape everything. You may also need to escape the double-quotes with ^. I think this ought to work:

SETLOCAL ENABLEDELAYEDEXPANSION
for /f "tokens=* USEBACKQ" %%a in (`git log --pretty^=format:"%%H" -n 1`) do (SET CURRENT_SHA=%%a)
ECHO Current Sha: %CURRENT_SHA%

But really, if you want to do shell programming in Windows just use Powershell and then you can do:

$CURRENT_SHA=git log --pretty=format:"%H" -n 1

edited May 3, 2016 at 13:24

Jon Cage

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answered May 3, 2016 at 12:34

Duncan

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1 Comment

Jon Cage Over a year ago

You sir, are a legend. I finally got it working with git log --pretty^=format:"%%H" -n 1 so it turns out it was the equals sign and a missing extra %

Dustin · Accepted Answer · 2024-06-05 16:06:35Z

0

Why not run:

git rev-parse --verify HEAD

answered Jun 5, 2024 at 16:06

Dustin

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