8bc5104a6e
When specifying the `builder` attribute in `stdenv.mkDerivation`, this
will be effectively transformed into
builtins.derivation {
builder = stdenv.shell;
args = [ "-e" builder ];
}
This also means that `default-builder.sh` is never sourced and as a
result it's not guaranteed that `$NIX_ATTRS_SH_FILE` is set to a correct
location[1].
Also, we need to source `.attrs.sh` to source `$stdenv`. So, the
following is done now:
* If `$NIX_ATTRS_SH_FILE` points to a correct location, then use it.
Directly using `.attrs.sh` is problematic for `nix-shell(1)` usage
(see previous commit for more context), so prefer the environment
variable if possible.
* Otherwise, if `.attrs.sh` exists, then use it. See [1] for when this
can happen.
* If neither applies, it can be assumed that `__structuredAttrs` is
turned off and thus nothing needs to be done.
[1] It's possible that it doesn't exist at all - in case of Nix 2.3 or
it can point to a wrong location on older Nix versions with a bug in
`__structuredAttrs`.
28 lines
1.2 KiB
Bash
28 lines
1.2 KiB
Bash
if [ -e "$NIX_ATTRS_SH_FILE" ]; then . "$NIX_ATTRS_SH_FILE"; elif [ -f .attrs.sh ]; then . .attrs.sh; fi
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source "${stdenv}/setup"
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echo "exporting ${repository}/${imageName} (tag: ${tag}) into ${out}"
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mkdir -p "${out}"
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cat <<EOF > "${out}/compositeImage.sh"
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#! ${bash}/bin/bash
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#
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# Create a tar archive of a docker image's layers, docker image config
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# json, manifest.json, and repositories json; this streams directly to
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# stdout and is intended to be used in concert with docker load, i.e:
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#
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# ${out}/compositeImage.sh | docker load
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# The first character follow the 's' command for sed becomes the
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# delimiter sed will use; this makes the transformation regex easy to
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# read. We feed tar a file listing the files we want in the archive,
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# because the paths are absolute and docker load wants them flattened in
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# the archive, we need to transform all of the paths going in by
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# stripping everything *including* the last solidus so that we end up
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# with the basename of the path.
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${gnutar}/bin/tar \
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--transform='s=.*/==' \
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--transform="s=.*-manifest.json=manifest.json=" \
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--transform="s=.*-repositories=repositories=" \
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-c "${manifest}" "${repositories}" -T "${imageFileStorePaths}"
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EOF
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chmod +x "${out}/compositeImage.sh"
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