glibc/SOURCES/glibc.req.in
2021-12-09 12:16:37 +00:00

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#!/bin/bash
# Auto-generating dependencies for glibc development snapshots.
#
# A glibc development snapshot (say version 2.33.9000) may define
# symbols in its under-development symbol version (GLIBC_2.34). RPM
# automatically derives RPM dependencies such as
# libc.so.6(GLIBC_2.34)(64bit) from that. While the GLIBC_2.34
# version is under development, these dependencies may be inaccurate
# and could be satisfied by glibc RPM package versions that lack the
# symbols because they were created from an earlier development
# snapshot that had some other GLIBC_2.34 symbols. Therefore, if the
# latest, under-development ELF symbol version is detected, this
# dependency generator adds an explicit RPM dependencies on the glibc
# packaging version against which an RPM package is built.
#
# This script runs for the glibc build itself. In this case, it may
# produce a >= dependency on the build-time glibc, but there will also
# be an (potentially indirect) = dependency, which takes precedence.
set -e
set -o pipefail
searching=true
# Pre-filter using eu-elfclassify, to skip kernel modules.
eu-elfclassify --loadable --file --stdin --print | while read path; do
# Assume that all dynamically linked objects depend on glibc in
# some way.
if $searching; then
# Undefined symbols within latest, under-development
# (changing) symbol versions trigger the versioned RPM
# dependency. Do not use "egrep -q" to keep reading from the
# pipe, avoiding a spurious EPIPE error in eu-readelf.
if eu-readelf -s "$path" \
| egrep '\sUNDEF\s.*@''@SYMVER@(\s|$)' >/dev/null
then
echo 'glibc >= @VERSION@-@RELEASE@'
# Stop searching after the first match, but keep reading from
# the pipe.
searching=false
fi
fi
done