scripts/gen_build_files.sh

   1 #!/bin/sh
   2
   3 # Note: was using sed OPTS CMD -- FILES
   4 # but users complain that many sed implementations
   5 # are misinterpreting --.
   6
   7 export LC_ALL=C
   8
   9 test $# -ge 2 || { echo "Syntax: $0 SRCTREE OBJTREE"; exit 1; }
  10
  11 # cd to objtree
  12 cd -- "$2" || { echo "Syntax: $0 SRCTREE OBJTREE"; exit 1; }
  13 # In separate objtree build, include/ might not exist yet
  14 mkdir include 2>/dev/null
  15
  16 srctree="$1"
  17
  18 status() { printf '  %-8s%s\n' "$1" "$2"; }
  19 gen() { status "GEN" "$@"; }
  20 chk() { status "CHK" "$@"; }
  21
  22 # scripts in the 'embed' directory are treated as fake applets
  23 custom_scripts()
  24 {
  25         custom_loc="$1"
  26         if [ -d "$custom_loc" ]
  27         then
  28                 for i in $(cd "$custom_loc"; ls * 2>/dev/null)
  29                 do
  30                         printf "IF_FEATURE_SH_EMBEDDED_SCRIPTS(APPLET_SCRIPTED(%s, scripted, BB_DIR_USR_BIN, BB_SUID_DROP, scripted))\n" $i;
  31                 done
  32         fi
  33 }
  34
  35 generate()
  36 {
  37         # NB: data to be inserted at INSERT line is coming on stdin
  38         src="$1"
  39         dst="$2"
  40         header="$3"
  41         loc="$4"
  42         #chk "${dst}"
  43         {
  44                 # Need to use printf: different shells have inconsistent
  45                 # rules re handling of "\n" in echo params.
  46                 printf "%s\n" "${header}"
  47                 # print everything up to INSERT line
  48                 sed -n '/^INSERT$/ q; p' "${src}"
  49                 # copy stdin to stdout
  50                 cat
  51                 if [ -n "$loc" ]
  52                 then
  53                         custom_scripts "$loc"
  54                 fi
  55                 # print everything after INSERT line
  56                 sed -n '/^INSERT$/ {
  57                 :l
  58                     n
  59                     p
  60                     bl
  61                 }' "${src}"
  62         } >"${dst}.tmp"
  63         if ! cmp -s "${dst}" "${dst}.tmp"; then
  64                 gen "${dst}"
  65                 mv "${dst}.tmp" "${dst}"
  66         else
  67                 rm -f "${dst}.tmp"
  68         fi
  69 }
  70
  71 # (Re)generate include/applets.h
  72 sed -n 's@^//applet:@@p' "$srctree"/*/*.c "$srctree"/*/*/*.c \
  73 | generate \
  74         "$srctree/include/applets.src.h" \
  75         "include/applets.h" \
  76         "/* DO NOT EDIT. This file is generated from applets.src.h */" \
  77         "$srctree/embed"
  78
  79 # (Re)generate include/usage.h
  80 # We add line continuation backslash after each line,
  81 # and insert empty line before each line which doesn't start
  82 # with space or tab
  83 TAB="$(printf '\tX')"
  84 TAB="${TAB%X}"
  85 LF="$(printf '\nX')"
  86 LF="${LF%X}"
  87 sed -n -e 's@^//usage:\([ '"$TAB"'].*\)$@\1 \\@p' \
  88        -e 's@^//usage:\([^ '"$TAB"'].*\)$@\'"$LF"'\1 \\@p' \
  89         "$srctree"/*/*.c "$srctree"/*/*/*.c \
  90 | generate \
  91         "$srctree/include/usage.src.h" \
  92         "include/usage.h" \
  93         "/* DO NOT EDIT. This file is generated from usage.src.h */"
  94
  95 # (Re)generate */Kbuild and */Config.in
  96 # We skip .dotdirs - makes git/svn/etc users happier
  97 { cd -- "$srctree" && find . -type d ! '(' -name '.?*' -prune ')'; } \
  98 | while read -r d; do
  99         d="${d#./}"
 100
 101         src="$srctree/$d/Kbuild.src"
 102         dst="$d/Kbuild"
 103         if test -f "$src"; then
 104                 mkdir -p -- "$d" 2>/dev/null
 105
 106                 sed -n 's@^//kbuild:@@p' "$srctree/$d"/*.c \
 107                 | generate \
 108                         "${src}" "${dst}" \
 109                         "# DO NOT EDIT. This file is generated from Kbuild.src"
 110         fi
 111
 112         src="$srctree/$d/Config.src"
 113         dst="$d/Config.in"
 114         if test -f "$src"; then
 115                 mkdir -p -- "$d" 2>/dev/null
 116
 117                 sed -n 's@^//config:@@p' "$srctree/$d"/*.c \
 118                 | generate \
 119                         "${src}" "${dst}" \
 120                         "# DO NOT EDIT. This file is generated from Config.src"
 121         fi
 122 done
 123
 124 # Last read failed. This is normal. Don't exit with its error code:
 125 exit 0