pyenv-binary-save: record direct system dependencies

plugins/pyenv-binary/libexec/pyenv-binary-save

@@ -92,12 +92,16 @@ fi
 if [ "$os" = "Linux" ]; then
   libc="$(getconf GNU_LIBC_VERSION 2>/dev/null || true)"
 fi
+if [ "$os" != "Darwin" ] && ! LC_ALL=C readelf --version >/dev/null 2>&1; then
+  echo "pyenv-binary: need readelf to inspect shared libraries" >&2
+  exit 1
+fi
 
 # List the external shared libraries the install links against: those that
 # resolve outside its own prefix, so they must already exist on the target.
 # The interpreter plus every bundled shared object are inspected.
 system_deps() {
-  local f
+  local f needed
   {
     for f in "${prefix}"/bin/python*; do
       [ -e "$f" ] && printf '%s\n' "$f"
@@ -111,8 +115,15 @@ system_deps() {
       otool -L "$f" 2>/dev/null | tail -n +2 | awk -v pfx="${prefix}/" \
         '$1 !~ /^@/ && substr($1, 1, length(pfx)) != pfx { print $1 }'
     else
-      ldd "$f" 2>/dev/null | awk -v pfx="${prefix}/" \
-        '$2 == "=>" && $3 ~ /^\// && substr($3, 1, length(pfx)) != pfx { print $1 }'
+      needed="$(LC_ALL=C readelf -dW "$f" 2>/dev/null | awk \
+        '$2 == "(NEEDED)" || $2 == "NEEDED" { sub(/^.*\[/, ""); sub(/\].*$/, ""); print }' | tr '\n' ' ')"
+      LC_ALL=C ldd "$f" 2>/dev/null | awk -v needed="$needed" -v pfx="${prefix}/" '
+        BEGIN {
+          split(needed, deps, " ")
+          for (i in deps) direct[deps[i]] = 1
+        }
+        $1 in direct && $2 == "=>" && $3 ~ /^\// && substr($3, 1, length(pfx)) != pfx { print $1 }
+      '
     fi
   done | sort -u
 }

plugins/pyenv-binary/test/package.bats

@@ -10,6 +10,7 @@ stub_build_environment() {
   create_stub pyenv-latest 'while (($#)); do case "$1" in -f|-k);; *)break;; esac; shift; done; echo "$*"'
   create_stub uname 'case "$1" in -s) echo Linux;; -m) echo x86_64;; esac'
   create_stub getconf 'echo "glibc 2.17"'
+  create_stub readelf true
 }
 
 @test "-v|--verbose runs pyenv install verbosely" {

plugins/pyenv-binary/test/save.bats

@@ -2,6 +2,10 @@
 
 load test_helper
 
+_setup() {
+  create_path_executable readelf "exit 0"
+}
+
 create_version() {
   mkdir -p "${PYENV_ROOT}/versions/$1/bin"
 }
@@ -79,7 +83,15 @@ platform() {
   assert_line "archive=3.12.7-$(platform).tar.gz"
 }
 
-@test "records only the libraries ldd resolves outside the prefix" {
+@test "fails when readelf is not available" {
+  create_version "3.12.7"
+
+  PATH="$(path_without readelf)" run pyenv-binary-save "3.12.7" "${BATS_TEST_TMPDIR}/dist"
+  assert_failure "pyenv-binary: need readelf to inspect shared libraries"
+  assert [ ! -e "${BATS_TEST_TMPDIR}/dist/3.12.7-$(platform).tar.gz" ]
+}
+
+@test "records only direct libraries resolved outside the prefix" {
   create_version "3.12.7"
   touch "${PYENV_ROOT}/versions/3.12.7/bin/python3.12"
   create_path_executable uname <<'STUB'
@@ -97,13 +109,18 @@ cat <<EOF
 	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f4a3b800000)
 	/lib64/ld-linux-x86-64.so.2 (0x00007f4a3c200000)
 EOF
+STUB
+  create_path_executable readelf <<'STUB'
+cat <<EOF
+ 0x0000000000000001 (NEEDED)             Shared library: [libpython3.12.so.1.0]
+ 0x0000000000000001 (NEEDED)             Shared library: [libm.so.6]
+EOF
 STUB
 
   run pyenv-binary-save "3.12.7" "${BATS_TEST_TMPDIR}/dist"
   assert_success
   run grep '^dep=' "${BATS_TEST_TMPDIR}/dist/"*.meta
-  assert_output "dep=libc.so.6
-dep=libm.so.6"
+  assert_output "dep=libm.so.6"
 }
 
 @test "records only the libraries otool resolves outside the prefix" {