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?

Answer 1

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