From a69ccd115238357c706383bc49db5c6ff33a5f4a Mon Sep 17 00:00:00 2001
From: Thierry Vignaud <thierry.vignaud@gmail.com>
Date: Mon, 24 Sep 2018 11:36:47 +0200
Subject: add __brp_mangle_shebangs from FC in order to:

- fix /bin -> /usr/bin
- resolve "env foobar" -> "foobar"

install it in /usr/lib/rpm/redhat to make clear from where it comes
---
 brp-mangle-shebangs | 142 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100755 brp-mangle-shebangs

(limited to 'brp-mangle-shebangs')

diff --git a/brp-mangle-shebangs b/brp-mangle-shebangs
new file mode 100755
index 0000000..67a1a7d
--- /dev/null
+++ b/brp-mangle-shebangs
@@ -0,0 +1,142 @@
+#!/bin/bash -eu
+
+# If using normal root, avoid changing anything.
+if [ -z "$RPM_BUILD_ROOT" -o "$RPM_BUILD_ROOT" = "/" ]; then
+  exit 0
+fi
+
+exclude_files=""
+exclude_files_from=""
+exclude_shebangs=""
+exclude_shebangs_from=""
+
+usage() {
+  local verbose=$1 && shift
+  local outfile=$1 && shift
+  local status=$1 && shift
+
+  (
+    echo 'usage: brp-mangle-shebangs [--files <regexp>] [--files-from <file>] [--shebangs <regexp>] [--shebangs-from <file>]'
+    if [ "${verbose}" == "yes" ]; then
+      echo '  --files: extended regexp of files to ignore'
+      echo '  --files-from: file containing a list of extended regexps of files to ignore'
+      echo '  --shebangs: extended regexp of shebangs to ignore'
+      echo '  --shebangs-from: file containing a list of extended regexps of shebangs to ignore'
+    fi
+  ) >>${outfile}
+  exit ${status}
+}
+
+while [ $# -gt 0 ] ; do
+  case "$1" in
+    --files)
+      exclude_files="${2}"
+      shift
+      ;;
+    --files=*)
+      exclude_files="${1##--files=}"
+      ;;
+    --files-from)
+      exclude_files_from="${2}"
+      shift
+      ;;
+    --files-from=*)
+      exclude_files_from="${1##--files-from=}"
+      ;;
+    --shebangs)
+      exclude_shebangs="${2}"
+      shift
+      ;;
+    --shebangs=*)
+      exclude_shebangs="${1##--shebangs=}"
+      ;;
+    --shebangs-from)
+      exclude_shebangs_from="${2}"
+      shift
+      ;;
+    --shebangs-from=*)
+      exclude_shebangs_from="${1##--shebangs-from=}"
+      ;;
+    --help|--usage|"-?"|-h)
+      usage yes /dev/stdout 0
+      ;;
+    *)
+      echo "Unknown option \"${1}\"" 1>&2
+      usage no /dev/stderr 1
+      ;;
+  esac
+  shift
+done
+
+cd "$RPM_BUILD_ROOT"
+
+trim() {
+  printf '%s' "$*"
+}
+
+fail=0
+while IFS= read -r -d $'\0' f; do
+  file -N --mime-type "$f" | grep -q -P ".+(?=: text/)" || continue
+
+  # Remove the dot
+  path="${f#.}"
+
+  if [ -n "$exclude_files" ]; then
+    echo "$path" | grep -q -E "$exclude_files" && continue
+  fi
+  if [ -n "$exclude_files_from" ]; then
+    echo "$path" | grep -q -E -f "$exclude_files_from" && continue
+  fi
+
+  ts=$(stat -c %y "$f")
+
+  read shebang_line < "$f" || :
+  orig_shebang=$(trim $(echo "$shebang_line" | grep -Po "#!\K.*" || echo))
+  shebang="$orig_shebang"
+  if [ -n "$exclude_shebangs" ]; then
+    echo "$shebang" | grep -q -E "$exclude_shebangs" && continue
+  fi
+  if [ -n "$exclude_shebangs_from" ]; then
+    echo "$shebang" | grep -q -E -f "$exclude_shebangs_from" && continue
+  fi
+
+  if [ -z "$shebang" ]; then
+    echo >&2 "*** WARNING: $f is executable but has empty or no shebang, removing executable bit"
+    chmod -x "$f"
+    touch -d "$ts" "$f"
+    continue
+  elif [ -n "${shebang##/*}" ]; then
+    echo >&2 "*** ERROR: $f has shebang which doesn't start with '/' ($shebang)"
+    fail=1
+    continue
+  fi
+
+  if ! { echo "$shebang" | grep -q -P "^/(?:usr/)?(?:bin|sbin)/"; }; then
+    continue
+  fi
+
+  # Replace "special" env shebang:
+  # /whatsoever/env /whatever/foo → /whatever/foo
+  shebang=$(echo "$shebang" | sed -r -e 's@^(.+)/env /(.+)$@/\2@')
+  # /whatsoever/env foo → /whatsoever/foo
+  shebang=$(echo "$shebang" | sed -r -e 's@^(.+/)env (.+)$@\1\2@')
+
+  # If the shebang now starts with /bin, change it to /usr/bin
+  # https://bugzilla.redhat.com/show_bug.cgi?id=1581757
+  shebang=$(echo "$shebang" | sed -r -e 's@^/bin/@/usr/bin/@')
+
+  # Replace ambiguous python with python2
+  py_shebang=$(echo "$shebang" | sed -r -e 's@/usr/bin/python(\s|$)@/usr/bin/python2\1@')
+
+  if [ "$shebang" != "$py_shebang" ]; then
+    echo >&2 "*** ERROR: ambiguous python shebang in $path: #!$orig_shebang. Change it to python3 (or python2) explicitly."
+    fail=1
+  elif [ "#!$shebang" != "#!$orig_shebang" ]; then
+    sed -i -e "1c #!$shebang" "$f"
+    echo "mangling shebang in $path from $orig_shebang to #!$shebang"
+  fi
+
+  touch -d "$ts" "$f"
+done < <(find -executable -type f -print0)
+
+exit $fail
-- 
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