find-debuginfo: Make sure files are writable before manipulating them

- Add 0005-writable.patch

Resolves: #RHEL-71661
debugedit 5.1 regression with read-only exe/lib files and gdb-add-index error reporting [rhel9]

0005-writable.patch

@@ -0,0 +1,89 @@
+commit 971a74d79b48a19ff1446642f39b3c5a8a7db238
+Author: Mark Wielaard <mark@klomp.org>
+Date:   Thu Nov 28 17:58:54 2024 +0100
+
+    find-debuginfo: Check files are writable before modifying them
+    
+    Since commit dfe1f7ff3 ("find-debuginfo.sh: Exit with real exit status
+    in parallel jobs") there is a check whether gdb-add-index worked
+    correctly and find-debuginfo would fail (even in parallel mode) if an
+    error occured.
+    
+    This turned out to show that gdb-add-index needs write permission to
+    add the gdb index to the file. This is also the case for a couple of
+    other things, like running objcopy --merge-notes. debugedit and
+    add_minidebug already made sure it had write permission.
+    
+    To make sure find-debuginfo doesn't (partially) fail extend the
+    writable check to include the gdb-add-index and objcopy --merge-notes
+    invocation.
+    
+    Signed-off-by: Mark Wielaard <mark@klomp.org>
+
+diff --git a/scripts/find-debuginfo.in b/scripts/find-debuginfo.in
+index a360bf0582dc..4e4ef5a64005 100755
+--- a/scripts/find-debuginfo.in
++++ b/scripts/find-debuginfo.in
+@@ -467,10 +467,22 @@
+     $strict && exit 2
+   fi
+ 
++  # debugedit makes sure to to get write permission to the file and
++  # restores original state after modifications. Other utilities
++  # might not.
++  f_writable="false"
++  if test -w "$f"; then f_writable="true"; fi
++
+   # Add .gdb_index if requested.
+   if $include_gdb_index; then
+     if type gdb-add-index >/dev/null 2>&1; then
++      if test "$f_writable" = "false"; then
++        chmod u+w "$f"
++      fi
+       gdb-add-index "$f"
++      if test "$f_writable" = "false"; then
++        chmod u-w "$f"
++      fi
+     else
+       echo >&2 "*** ERROR: GDB index requested, but no gdb-add-index installed"
+       exit 2
+@@ -497,7 +512,13 @@ do_file()
+ 
+   # Compress any annobin notes in the original binary.
+   # Ignore any errors, since older objcopy don't support --merge-notes.
++  if test "$f_writable" = "false"; then
++    chmod u+w "$f"
++  fi
+   objcopy --merge-notes "$f" 2>/dev/null || true
++  if test "$f_writable" = "false"; then
++    chmod u-w "$f"
++  fi
+ 
+   # A binary already copied into /usr/lib/debug doesn't get stripped,
+   # just has its file names collected and adjusted.
+@@ -507,7 +528,7 @@ do_file()
+   esac
+ 
+   mkdir -p "${debugdn}"
+-  if test -w "$f"; then
++  if test "$f_writable" = "true"; then
+     strip_to_debug "${debugfn}" "$f"
+   else
+     chmod u+w "$f"
+@@ -529,7 +550,15 @@ do_file()
+       application/x-executable*) skip_mini=false ;;
+       application/x-pie-executable*) skip_mini=false ;;
+     esac
+-    $skip_mini || add_minidebug "${debugfn}" "$f"
++    if test "$skip_mini" = "true"; then
++      if test "$f_writable" = "false"; then
++        chmod u+w "$f"
++      fi
++      add_minidebug "${debugfn}" "$f"
++      if test "$f_writable" = "false"; then
++        chmod u-w "$f"
++      fi
++    fi
+   fi
+ 
+   echo "./${f#$RPM_BUILD_ROOT}" >> "$ELFBINSFILE"

debugedit.spec

@@ -1,6 +1,6 @@
 Name: debugedit
 Version: 5.0
-Release: 6%{?dist}
+Release: 7%{?dist}
 Summary: Tools for debuginfo creation
 License: GPLv3+ and GPLv2+ and LGPLv2+
 URL: https://sourceware.org/debugedit/
@@ -43,6 +43,7 @@ Patch2: 0002-scripts-find-debuginfo.in-Add-q-quiet.patch
 Patch3: 0001-debugedit-Add-support-for-.debug_str_offsets-DW_FORM.patch
 Patch4: 0003-elf_strptr.patch
 Patch5: 0004-compress.patch
+Patch6: 0005-writable.patch
 
 %description
 The debugedit project provides programs and scripts for creating
@@ -86,6 +87,9 @@ make check %{?_smp_mflags}
 %{_mandir}/man1/find-debuginfo.1*
 
 %changelog
+* Fri Mar 21 2025 Mark Wielaard <mjw@redhat.com> - 5.0-7
+- Add 0005-writable.patch
+
 * Fri Mar 21 2025 Mark Wielaard <mjw@redhat.com> - 5.0-6
 - Add 0003-elf_strptr.patch
 - Add 0004-compress.patch