git-gui: Revert "Don't modify CREDITS-FILE if it hasn't changed."

This reverts commit 92446ab.

Too many users have complained about the credits generator in
git-gui, so I'm backing the entire thing out.

Signed-off-by: Shawn O. Pearce <[email protected]>

CREDITS-GEN

@@ -20,8 +20,8 @@ tree_search ()
 generate_credits ()
 {
 	tip=$1 &&
-	rm -f "$2" &&
-	git shortlog -n -s $tip | sed 's/: .*$//' >"$2" || exit
+	rm -f $CF &&
+	git shortlog -n -s $tip | sed 's/: .*$//' >$CF || exit
 }
 
 # Always use the tarball credits file if found, just
@@ -36,36 +36,23 @@ generate_credits ()
 # that fact.
 #
 
-credits_tmp=/var/tmp/gitgui-credits-$$
-trap 'rm -f "$credits_tmp"' 0
-
-orig="$credits_tmp"
-
 if test -f credits
 then
-	orig=credits
+	rm -f $CF &&
+	cp credits $CF || exit
 elif prefix="$(git rev-parse --show-prefix 2>/dev/null)" &&
    test -n "$prefix" &&
    head=$(git rev-list --max-count=1 HEAD -- . 2>/dev/null) &&
    tree=$(git rev-parse --verify "HEAD:$prefix" 2>/dev/null) &&
    tip=$(tree_search $head $tree) &&
    test -n "$tip"
 then
-	generate_credits $tip "$orig" || exit
+	generate_credits $tip || exit
 elif tip="$(git rev-parse --verify HEAD 2>/dev/null)" &&
    test -n "$tip"
 then
-	generate_credits $tip "$orig" || exit
+	generate_credits $tip || exit
 else
 	echo "error: Cannot locate authorship information." >&2
 	exit 1
 fi
-
-if test -f "$orig" && cmp -s "$orig" "$CF"
-then
-	: noop
-else
-	rm -f "$CF" &&
-	cat "$orig" >"$CF"
-fi
-