git log -S doesn't respect --no-textconv:

    $ echo '*.txt diff=wrong' > .gitattributes
    $ git -c diff.wrong.textconv='xxx' log --no-textconv -Sfoo
    error: cannot run xxx: No such file or directory
    fatal: unable to read files to diff

Signed-off-by: Simon Ruderich <si...@ruderich.org>
Reported-by: Matthieu Moy <matthieu....@grenoble-inp.fr>
---
On Thu, Apr 04, 2013 at 10:34:17AM +0200, Matthieu Moy wrote:
> Hi,
>
> It seems the command "git log --no-textconv -Sfoo" still runs the
> textconv filter (noticed because I have a broken textconv filter that
> lets "git log -S" error out).
>
> [snip]

Hello Matthieu,

This patch should fix it. All tests pass.

Regards
Simon

 diffcore-pickaxe.c     | 15 ++++++++++++---
 t/t4209-log-pickaxe.sh | 14 ++++++++++++++
 2 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/diffcore-pickaxe.c b/diffcore-pickaxe.c
index b097fa7..f814a52 100644
--- a/diffcore-pickaxe.c
+++ b/diffcore-pickaxe.c
@@ -78,7 +78,6 @@ static void fill_one(struct diff_filespec *one,
                     mmfile_t *mf, struct userdiff_driver **textconv)
 {
        if (DIFF_FILE_VALID(one)) {
-               *textconv = get_textconv(one);
                mf->size = fill_textconv(*textconv, one, &mf->ptr);
        } else {
                memset(mf, 0, sizeof(*mf));
@@ -97,6 +96,11 @@ static int diff_grep(struct diff_filepair *p, struct 
diff_options *o,
        if (diff_unmodified_pair(p))
                return 0;
 
+       if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
+               textconv_one = get_textconv(p->one);
+               textconv_two = get_textconv(p->two);
+       }
+
        fill_one(p->one, &mf1, &textconv_one);
        fill_one(p->two, &mf2, &textconv_two);
 
@@ -201,14 +205,19 @@ static unsigned int contains(mmfile_t *mf, struct 
diff_options *o,
 static int has_changes(struct diff_filepair *p, struct diff_options *o,
                       regex_t *regexp, kwset_t kws)
 {
-       struct userdiff_driver *textconv_one = get_textconv(p->one);
-       struct userdiff_driver *textconv_two = get_textconv(p->two);
+       struct userdiff_driver *textconv_one = NULL;
+       struct userdiff_driver *textconv_two = NULL;
        mmfile_t mf1, mf2;
        int ret;
 
        if (!o->pickaxe[0])
                return 0;
 
+       if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
+               textconv_one = get_textconv(p->one);
+               textconv_two = get_textconv(p->two);
+       }
+
        /*
         * If we have an unmodified pair, we know that the count will be the
         * same and don't even have to load the blobs. Unless textconv is in
diff --git a/t/t4209-log-pickaxe.sh b/t/t4209-log-pickaxe.sh
index eed7273..953cec8 100755
--- a/t/t4209-log-pickaxe.sh
+++ b/t/t4209-log-pickaxe.sh
@@ -116,4 +116,18 @@ test_expect_success 'log -S -i (nomatch)' '
        test_cmp expect actual
 '
 
+test_expect_success 'log -S --textconv (missing textconv tool)' '
+       echo "* diff=test" >.gitattributes &&
+       test_must_fail git -c diff.test.textconv=missing log -Sfoo &&
+       rm .gitattributes
+'
+
+test_expect_success 'log -S --no-textconv (missing textconv tool)' '
+       echo "* diff=test" >.gitattributes &&
+       git -c diff.test.textconv=missing log -Sfoo --no-textconv >actual &&
+       >expect &&
+       test_cmp expect actual &&
+       rm .gitattributes
+'
+
 test_done
-- 
1.8.2

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+ public key id: 0x92FEFDB7E44C32F9
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