name : brp-mangle-shebangs #!/bin/bash # 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" # Large packages such as kernel can have thousands of executable files. # We take care to not fork/exec thousands of "file"s and "grep"s, # but run just two of them. # (Take care to exclude filenames which would mangle "file" output). find -executable -type f ! -path '*:*' ! -path $'*\n*' \ | file -N --mime-type -f - \ | grep -P ".+(?=: text/)" \ | { fail=0 while IFS= read -r line; do f=${line%%:*} # 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 "$exclude_files_from" && continue fi if ! read shebang_line < "$f"; then echo >&2 "*** WARNING: Cannot read the first line from $f, removing executable bit" ts=$(stat -c %y "$f") chmod -x "$f" touch -d "$ts" "$f" continue fi orig_shebang="${shebang_line#\#!}" if [ "$orig_shebang" = "$shebang_line" ]; then echo >&2 "*** WARNING: $f is executable but has no shebang, removing executable bit" ts=$(stat -c %y "$f") chmod -x "$f" touch -d "$ts" "$f" continue fi # Trim spaces while shebang="${orig_shebang// / }"; [ "$shebang" != "$orig_shebang" ]; do orig_shebang="$shebang" done # Treat "#! /path/to " as "#!/path/to" orig_shebang="${orig_shebang# }" shebang="$orig_shebang" if [ -z "$shebang" ]; then echo >&2 "*** WARNING: $f is executable but has empty shebang, removing executable bit" ts=$(stat -c %y "$f") chmod -x "$f" touch -d "$ts" "$f" continue fi if [ -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 (.+)$@\1\2@') # Replace python3 with the desired Python 3 shebang, # if passed as an non-empty environment variable PYTHON3 if [ -n "${PYTHON3:+x}" ]; then shebang=$(echo "$shebang" | sed -r -e "s@/usr/bin/python3(\s|$)@${PYTHON3}\1@") fi # 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 echo "mangling shebang in $path from $orig_shebang to #!$shebang" ts=$(stat -c %y "$f") sed -i -e "1c #!$shebang" "$f" touch -d "$ts" "$f" fi done exit $fail }