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docker: fix ipfs version --commit #2734

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May 20, 2016
Merged

docker: fix ipfs version --commit #2734

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6b94fde
docker: fix CurrentCommit discovery
May 18, 2016
7145d30
docker: add test for ipfs version --commit
May 18, 2016
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4 changes: 2 additions & 2 deletions Dockerfile
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Expand Up @@ -53,8 +53,8 @@ RUN apk add --update musl go=$GO_VERSION git bash wget ca-certificates \
# We get the current commit using this hack,
# so that we don't have to copy all of .git/ into the build context.
# This saves us quite a bit of image size.
&& ref="$(cat .git/HEAD | cut -d' ' -f2)" \
&& commit="$(cat .git/$ref | head -c 7)" \
&& 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) \
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To get the current commit it's better to use git rev-parse --short HEAD and to get the current branch git symbolic-ref --short HEAD 2>/dev/null || echo "$commit" (where $commit is the current commit).

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Hey thanks for wighing in! -- do you happen to know if rev-parse and symbolic-ref work without an actual repo, i.e. with only .git/HEAD and .git/refs or something similar present? The idea with this hack is that we don't have to copy all of .git, and thus gain savings in image size.

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You need the following for rev-parse and symbolic-ref to work:

  • .git/HEAD
  • .git/refs/
  • .git/objects/ which can be empty

See: https://github.com/git/git/blob/master/setup.c#L266

So it might be a good idea to just mkdir .git/objects/ so that you can use git commands afterwards.

It could be also a good idea to copy .git/packed-refs if it exists in case the refs are packed.

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@jbenet jbenet Aug 26, 2016 •
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i think this is working right? did we want the improvements @chriscool proposed?

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Sorry, nevermind, already improved: 0eed330 👍

&& echo "ldflags=-X github.com/ipfs/go-ipfs/repo/config.CurrentCommit=$commit" \
# Build and install IPFS and entrypoint script
&& cd $SRC_PATH/cmd/ipfs \
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4 changes: 2 additions & 2 deletions test/Dockerfile
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Expand Up @@ -44,8 +44,8 @@ RUN apk add --update musl go=$GO_VERSION git bash wget ca-certificates \
COPY . $SRC_PATH

RUN cd $SRC_PATH \
&& ref="$(cat .git/HEAD | cut -d' ' -f2)" \
&& commit="$(cat .git/$ref | head -c 7)" \
&& 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) \
&& echo "ldflags=-X github.com/ipfs/go-ipfs/repo/config.CurrentCommit=$commit" \
&& cd $SRC_PATH/cmd/ipfs \
&& go build -ldflags "-X github.com/ipfs/go-ipfs/repo/config.CurrentCommit=$commit" \
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