adding findlib

shell/findlib.sh

@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+#
+# Search for a named library linked in to an object (binary)
+#
+# Input: <name of library to find> - suffix will be stripped
+# Output: comma delimited (object,library,filematch)
+#
+# SPDX-License-Identifier: MIT
+
+# strip everything after the first .so (libfoo.so.1.2.3 -> libfoo)
+LIB="${1%%.so*}"
+if [[ -z "${LIB}" ]]; then
+  echo "Empty string, aborting."
+  exit 1
+else
+  # use STDOUT in case script output is being saved to a file
+  (>&2 echo -e "Search: ${LIB} (status: \"watch -n 10 kill -HUP $$\" in another terminal)")
+fi
+
+# we'll populate _CDIR and _COBJ in looping stanzas, this goes to STDERR
+_CDIR=""
+_COBJ=""
+function hupcstat() {
+  (>&2 echo "${_CDIR}: ${_COBJ}")
+}
+trap hupcstat SIGHUP
+
+# params: <name> <colon seperated dirs to search>
+# output: <object>,<linked name>,<found location>
+function searchlib() {
+  WHAT="${1}"
+  WHERE="${2}"
+  OLDIFS=${IFS}
+  IFS=:
+  # do not be tempted to quote the array, breaks IFS work later
+  for SEARCHDIR in ${WHERE}; do
+    if [[ -d "${SEARCHDIR}" && ! -h "${SEARCHDIR}" ]]; then
+      _CDIR="${SEARCHDIR}"
+      # this can beat up the system depending, use ionice to tame it
+      # rather than use '-printf "%p:"' to find we remove dupes first
+      # the -L follows symlinks, so with -type f and sort we weed out trash
+      # exclude kernel modules and firmware to reduce wasted time
+      OBJS=$(ionice -c 2 -n 4 find -L "${SEARCHDIR}" \
+             -not \( -path /lib/modules -prune \) \
+             -not \( -path /usr/lib/modules -prune \) \
+             -not \( -path /lib/firmware -prune \) \
+             -not \( -path /usr/lib/firmware -prune \) \
+             -type f | sort -u | tr '\n' ':')
+      for OBJ in ${OBJS}; do
+        # ldd "not a dynamic executable" is faster than using 'file'
+        _COBJ="${OBJ}"
+        ldd "${OBJ}" 2>/dev/null | grep -iF "${WHAT}" | \
+          awk '{print $1 "," $3}' | \
+          xargs -I '{}' printf "${OBJ},%s\n" '{}'
+      done
+    fi
+  done
+  IFS=${OLDIFS}
+}
+
+# Search for binaries in $PATH first
+searchlib "${LIB}" "${PATH}"
+
+# Search all well-known (depends on distro) library paths
+LDP="/lib:/usr/lib:/usr/local/lib:/lib32:/lib64:/usr/lib32:/usr/lib64:/usr/local/lib32:/usr/local/lib64:/lib/i386-linux-gnu:/lib/x86_64-linux-gnu:/usr/i686-linux-gnu/lib32:/usr/i686-linux-gnu/lib64:/usr/lib/i386-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/local/lib/i386-linux-gnu:/usr/local/lib/x86_64-linux-gnu:/usr/x86_64-linux-gnu/lib64:/opt:${LD_LIBRARY_PATH}"
+searchlib "${LIB}" "${LDP}"
+
+exit 0