docker: simplify git ref resolution, thanks @chriscool #2754
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| # This saves us quite a bit of image size. | ||
| && ref=$(cat .git/HEAD | grep ref | cut -d' ' -f2) \ | ||
| && commit=$(if [ -z "$ref" ]; then cat .git/HEAD; else cat ".git/$ref"; fi | head -c 7) \ | ||
| && mkdir .git/objects && commit=$(git rev-parse HEAD | head -c 7) \ |
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Why don't you use git rev-parse --short HEAD instead of git rev-parse HEAD | head -c 7?
There is the following about --short in the git rev-parse documentation:
--short
--short=number
Instead of outputting the full SHA-1 values of object names try to abbreviate them to a shorter unique name. When no length is specified 7 is used. The minimum length is 4.
so it does the right thing by default. It prints a 7 character long name. (See: https://git-scm.com/docs/git-rev-parse/2.8.3)
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Great point, thanks! Changed to --short.
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License: MIT Signed-off-by: Lars Gierth <larsg@systemli.org>
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It looks great to me now! |
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git rev-parsesimply needed.git/packed-refsand an empty.git/objects/directory.