How to set variable from git command output using windows cmd/batch

Question

I have trouble "forwarding" an output to a variable. I'm using Atlassian SourceTree with my GIT versioning. There I want to create a custom action, with which I can easily create a zip file of all modified files of one commit. The created file should have a formatted date of the commit time in the filename as update-<YYYYmmdd>T<hhMM>.zip.

My working batch-file so far (line numbers for later reference):

1:  setlocal enabledelayedexpansion
2:  set output=
3:  for /f "delims=" %%a in ('git diff-tree --no-commit-id --name-only -r %1^^') do ( set output=!output! "%%a" )
4:  set hours=
5:  git show -s --format=%%ci %1 > tmptmptmp & set /p hours= < tmptmptmp & del tmptmptmp
6:  set hours=%hours:~0,4%%hours:~5,2%%hours:~8,2%T%hours:~11,2%%hours:~14,2%
7:  git archive -o update-%hours%.zip HEAD %output%
8:  endlocal

I'm having trouble to rewrite line 5 (hours-line) to avoid creating a temporary file. If I do the same as in line 3 (output-line) like:

for /f "delims=" %%a in ('git show -s --format=%%ci %1^^') do ( set hours=!hours! "%%a" )

I get the following error:

fatal: ambiguous argument '%ci': unknown revision or path not in the working tree. Use '--' to separate paths from revisions, like this: git <command> [<revision>...] -- [<file>...]

I assume this has something to do with the needed %ci parameter (for formatting the output).

Can somebody help me with this?

try with %c.Not sure if in this case the % should be escaped. — npocmaka
– npocmaka, Commented Apr 22, 2015 at 16:48
But %c ist not a valid parameter for --format. git show -s --format=%ci <commit-id> returns an iso formatted (I know, not strict) date string of the commits timestamp. Your suggenstion only returns "%c" if used in git bash. — Seika85
– Seika85, Commented Apr 23, 2015 at 9:18

JosefZ · Accepted Answer · 2015-04-23 11:18:39Z

1

I do not know why do you add trailing ^ caret (a circumflex accent) over the same command used in line 5 git show -s --format=%%ci %1.

However, the = equals sign in --format=%%ci should be escaped as follows:

for /f "delims=" %%a in ('git show -s --format^=%%ci %1^^') do set hours=!hours! "%%a"

A proof sample:

==>type 29803777.bat

IF NOT [%1]==[] dir /B %1=
for /f "delims=" %%a in ('IF NOT [%1]==[] dir /B %1=') do @echo "%%a"
for /f "delims=" %%a in ('IF NOT [%1]^=^=[] dir /B %1^=') do @echo "%%a"

==>29803777.bat x

==>IF NOT [x] == [] dir /B x=
x.txt

==>for /F "delims=" %a in ('IF NOT [x] [] dir /B x ') do @echo "%a"
[] was unexpected at this time.

==>for /F "delims=" %a in ('IF NOT [x]==[] dir /B x=') do @echo "%a"
"x.txt"

==>

edited Apr 23, 2015 at 11:18

answered Apr 23, 2015 at 10:36

JosefZ

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