Connor Baker
50 lines
1.8 KiB
Bash
50 lines
1.8 KiB
Bash
# shellcheck shell=bash
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# getRunpathEntries
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# Append the runpath entries of the dynamically linked ELF file at path to the indexed array referenced by
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# outputArrRef.
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#
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# NOTE: This function does not check if path is a valid ELF file.
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#
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# Arguments:
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# - path: a path to an ELF file with a dynamic section
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# - outputArrRef: a reference to an indexed array (mutated only by appending)
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#
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# Returns 0 if the file is dynamically linked and the runpath was appended to the output array.
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# Returns 1 if patchelf fails (e.g., the ELF file is not dynamically linked, so patchelf fails to print the rpath).
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getRunpathEntries() {
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if (($# != 2)); then
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nixErrorLog "expected two arguments!"
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nixErrorLog "usage: getRunpathEntries path outputArrRef"
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exit 1
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fi
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local -r path="$1"
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local -rn outputArrRef="$2"
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if [[ ! -f $path ]]; then
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nixErrorLog "first argument path $path is not a file"
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exit 1
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elif ! isDeclaredArray "${!outputArrRef}"; then
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nixErrorLog "second argument outputArrRef must be a reference to an indexed array"
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exit 1
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fi
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# Declare runpath separately to avoid masking the return value of patchelf.
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local runpath
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# Files that are not dynamically linked cause patchelf to exit with a non-zero status and print to stderr.
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# If patchelf fails to print the rpath, we assume the file is not dynamically linked.
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runpath="$(patchelf --print-rpath "$path" 2>/dev/null)" || return 1
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# If the runpath is empty and we feed it to mapfile, it gives us a singleton array with an empty string.
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# We want to avoid that, so we check if the runpath is empty before trying to populate runpathEntries.
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local -a runpathEntries=()
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if [[ -n $runpath ]]; then
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mapfile -d ':' -t runpathEntries < <(echo -n "$runpath")
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fi
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outputArrRef+=("${runpathEntries[@]}")
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return 0
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}
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