diff options
Diffstat (limited to 'build-aux/move-if-change')
| -rwxr-xr-x | build-aux/move-if-change | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/build-aux/move-if-change b/build-aux/move-if-change index a891ca51f0..e7ba25e312 100755 --- a/build-aux/move-if-change +++ b/build-aux/move-if-change @@ -2,7 +2,7 @@ # Like mv $1 $2, but if the files are the same, just delete $1. # Status is zero if successful, nonzero otherwise. -VERSION='2007-09-28 23:10'; # UTC +VERSION='2011-01-28 20:09'; # UTC # The definition above must lie within the first 8 lines in order # for the Emacs time-stamp write hook (at end) to update it. # If you change this file with Emacs, please let the write hook @@ -32,15 +32,18 @@ If SOURCE is different than DEST, then move it to DEST; else remove SOURCE. --help display this help and exit --version output version information and exit +The variable CMPPROG can be used to specify an alternative to \`cmp'. + Report bugs to <bug-gnulib@gnu.org>." version=`expr "$VERSION" : '\([^ ]*\)'` version="move-if-change (gnulib) $version -Copyright (C) 2007 Free Software Foundation, Inc. +Copyright (C) 2011 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law." +cmpprog=${CMPPROG-cmp} for arg do @@ -60,12 +63,15 @@ do esac done -test $# = 2 || { echo "$0: $usage" >&2; exit 1; } +test $# -eq 2 || { echo "$0: $usage" >&2; exit 1; } -if test -r "$2" && cmp -s -- "$1" "$2"; then +if test -r "$2" && $cmpprog -- "$1" "$2" >/dev/null; then rm -f -- "$1" else - mv -f -- "$1" "$2" + if mv -f -- "$1" "$2"; then :; else + # Ignore failure due to a concurrent move-if-change. + test -r "$2" && $cmpprog -- "$1" "$2" >/dev/null && rm -f -- "$1" + fi fi ## Local Variables: |