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 `$NIX_ATTRS_SH_FILE` points to a correct location, then use it.
Directly using `.attrs.sh` is problematic for `nix-shell(1)` usage
(see previous commit for more context), so prefer the environment
variable if possible.
* Otherwise, if `.attrs.sh` exists, then use it. See [1] for when this
can happen.
* If neither applies, it can be assumed that `__structuredAttrs` is
turned off and thus nothing needs to be done.
[1] It's possible that it doesn't exist at all - in case of Nix 2.3 or
it can point to a wrong location on older Nix versions with a bug in
`__structuredAttrs`.
23 lines
623 B
Bash
23 lines
623 B
Bash
if [ -e "$NIX_ATTRS_SH_FILE" ]; then . "$NIX_ATTRS_SH_FILE"; elif [ -f .attrs.sh ]; then . .attrs.sh; fi
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source $stdenv/setup
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tagtext=""
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tagflags=""
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# Darcs hashes are sha1 (120 bits, 40-character hex)
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if [[ "$rev" =~ [a-fA-F0-9]{40} ]]; then
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tagtext="(hash $rev)"
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tagflags="--to-hash=$rev"
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elif test -n "$rev"; then
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tagtext="(tag $rev)"
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tagflags="--tag=$rev"
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elif test -n "$context"; then
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tagtext="(context)"
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tagflags="--context=$context"
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fi
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echo "getting $url $partial ${tagtext} into $out"
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darcs get --lazy $tagflags "$url" "$out"
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# remove metadata, because it can change
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rm -rf "$out/_darcs"
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