36 lines
1022 B
Bash
36 lines
1022 B
Bash
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#!/bin/sh
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# Register the identity shim in /etc/ld.so.preload (NAROS.md §2.3).
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#
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# Idempotent, and additive rather than authoritative: the file is rewritten preserving any
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# other entries, so this package never owns unrelated preloads. The write goes through a
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# temp file + rename because /etc/ld.so.preload is read by the loader on EVERY exec — a
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# partially written list would be observed by whatever runs during the write.
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set -e
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LIB=/usr/lib/naros/libnaros-uname.so
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PRELOAD=/etc/ld.so.preload
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TMP="$PRELOAD.naros-tmp"
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case "$1" in
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configure)
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# Belt and braces: never point the loader at a library that is not on disk.
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if [ ! -f "$LIB" ]; then
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echo "naros-identity: $LIB missing, not registering preload" >&2
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exit 0
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fi
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if [ -f "$PRELOAD" ] && grep -qxF "$LIB" "$PRELOAD"; then
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exit 0
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fi
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if [ -f "$PRELOAD" ]; then
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cat "$PRELOAD" > "$TMP"
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else
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: > "$TMP"
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fi
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echo "$LIB" >> "$TMP"
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chmod 0644 "$TMP"
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mv "$TMP" "$PRELOAD"
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;;
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esac
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exit 0
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