Hi,

g...@jeffhostetler.com wrote:

> Signed-off-by: Jeff Hostetler <jeffh...@microsoft.com>
> ---
>  builtin/fsck.c  |  1 +
>  cache.h         |  2 ++
>  read-cache.c    |  7 +++++++
>  t/t1450-fsck.sh | 11 +++++++++++
>  4 files changed, 21 insertions(+)

Yay!  I love this version.

> --- a/builtin/fsck.c
> +++ b/builtin/fsck.c
> @@ -771,6 +771,7 @@ int cmd_fsck(int argc, const char **argv, const char 
> *prefix)
>       }
>  
>       if (keep_cache_objects) {
> +             force_verify_index_checksum = 1;

nit: now that there isn't a config this is overriding, this isn't
"force_verify" so much as "verify".

[...]
> +++ b/t/t1450-fsck.sh
> @@ -689,4 +689,15 @@ test_expect_success 'bogus head does not fallback to all 
> heads' '
>       ! grep $blob out
>  '
>  
> +test_expect_success PERL 'detect corrupt index file in fsck' '
> +     cp .git/index .git/index.backup &&
> +     echo zzzzzzzz >zzzzzzzz &&
> +     git add zzzzzzzz &&
> +     perl -pi -e "s/zzzzzzzz/yyyyyyyy/" .git/index &&
> +     test_must_fail git fsck --cache &&
> +     rm .git/index &&
> +     mv .git/index.backup .git/index &&
> +     rm zzzzzzzz
> +'

This is great.

optional: you can do the cleanup commands in test_when_finished to
make sure they happen even if the test fails.

Tests don't seem to use "perl -pi" anywhere else.  This instance could
be simplified by using sed.

With whatever subset of the changes below look good,
Reviewed-by: Jonathan Nieder <jrnie...@gmail.com>

diff --git i/builtin/fsck.c w/builtin/fsck.c
index 92324e130c..b5e13a4556 100644
--- i/builtin/fsck.c
+++ w/builtin/fsck.c
@@ -771,7 +771,7 @@ int cmd_fsck(int argc, const char **argv, const char 
*prefix)
        }
 
        if (keep_cache_objects) {
-               force_verify_index_checksum = 1;
+               verify_index_checksum = 1;
                read_cache();
                for (i = 0; i < active_nr; i++) {
                        unsigned int mode;
diff --git i/cache.h w/cache.h
index 48b47083d3..9834d71f28 100644
--- i/cache.h
+++ w/cache.h
@@ -706,7 +706,7 @@ extern void update_index_if_able(struct index_state *, 
struct lock_file *);
 extern int hold_locked_index(struct lock_file *, int);
 extern void set_alternate_index_output(const char *);
 
-extern int force_verify_index_checksum;
+extern int verify_index_checksum;
 
 /* Environment bits from configuration mechanism */
 extern int trust_executable_bit;
diff --git i/read-cache.c w/read-cache.c
index 13326464d4..008b335844 100644
--- i/read-cache.c
+++ w/read-cache.c
@@ -1372,7 +1372,7 @@ struct ondisk_cache_entry_extended {
                            ondisk_cache_entry_size(ce_namelen(ce)))
 
 /* Allow fsck to force verification of the index checksum. */
-int force_verify_index_checksum;
+int verify_index_checksum;
 
 static int verify_hdr(struct cache_header *hdr, unsigned long size)
 {
@@ -1386,7 +1386,7 @@ static int verify_hdr(struct cache_header *hdr, unsigned 
long size)
        if (hdr_version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < hdr_version)
                return error("bad index version %d", hdr_version);
 
-       if (!force_verify_index_checksum)
+       if (!verify_index_checksum)
                return 0;
 
        git_SHA1_Init(&c);
diff --git i/t/t1450-fsck.sh w/t/t1450-fsck.sh
index 86757ffa52..e69b32f219 100755
--- i/t/t1450-fsck.sh
+++ w/t/t1450-fsck.sh
@@ -689,15 +689,15 @@ test_expect_success 'bogus head does not fallback to all 
heads' '
        ! grep $blob out
 '
 
-test_expect_success PERL 'detect corrupt index file in fsck' '
+test_expect_success 'detect corrupt index file in fsck' '
        cp .git/index .git/index.backup &&
+       test_when_finished "mv .git/index.backup .git/index" &&
        echo zzzzzzzz >zzzzzzzz &&
+       test_when_finished "rm zzzzzzzz" &&
        git add zzzzzzzz &&
-       perl -pi -e "s/zzzzzzzz/yyyyyyyy/" .git/index &&
-       test_must_fail git fsck --cache &&
-       rm .git/index &&
-       mv .git/index.backup .git/index &&
-       rm zzzzzzzz
+       sed -e "s/zzzzzzzz/yyyyyyyy/" .git/index >.git/index+ &&
+       mv .git/index+ .git/index &&
+       test_must_fail git fsck --cache
 '
 
 test_done

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