35 lines
1.9 KiB
Bash
35 lines
1.9 KiB
Bash
# The real pg_config needs to be in the same path as the "postgres" binary
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# to return proper paths. However, we want it in the -dev output to prevent
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# cyclic references and to prevent blowing up the runtime closure. Thus, we
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# have wrapped -dev/bin/pg_config to fake its argv0 to be in the default
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# output. Unfortunately, pg_config tries to be smart and tries to find itself -
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# which will then fail with:
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# pg_config: could not find own program executable
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# To counter this, we're creating *this* fake pg_config script and put it into
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# the default output. The real pg_config is happy.
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# Some extensions, e.g. timescaledb, use the reverse logic and look for pg_config
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# in the same path as the "postgres" binary to support multi-version-installs.
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# Thus, they will end up calling this script during build, even though the real
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# pg_config would be available on PATH, provided by nativeBuildInputs. To help
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# this case, we're redirecting the call to pg_config to the one found in PATH,
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# iff we can be convinced that it belongs to our -dev output.
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# Avoid infinite recursion
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if [[ ! -v PG_CONFIG_CALLED ]]; then
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# compares "path of *this* script" with "path, which pg_config on PATH believes it is in"
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if [[ "$(readlink -f -- "$0")" == "$(PG_CONFIG_CALLED=1 pg_config --bindir)/pg_config" ]]; then
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# The pg_config in PATH returns the same bindir that we're actually called from.
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# This means that the pg_config in PATH is the one from "our" -dev output.
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# This happens when the -dev output has been put in native build
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# inputs and allows us to call the real pg_config without referencing
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# the -dev output itself.
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exec pg_config "$@"
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fi
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fi
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# This will happen in one of these cases:
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# - *this* script is the first on PATH
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# - np pg_config on PATH
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# - some other pg_config on PATH, not from our -dev output
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echo The real pg_config can be found in the -dev output.
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exit 1
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