Identical to support in `git receive-pack for the config option
`receive.fsck.skiplist`, we now support ignoring given objects in
`git fsck` via `fsck.skiplist` altogether.

This is extremely handy in case of legacy repositories where it would
cause more pain to change incorrect objects than to live with them
(e.g. a duplicate 'author' line in an early commit object).

Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
---
 Documentation/config.txt |  7 +++++++
 builtin/fsck.c           | 10 ++++++++++
 2 files changed, 17 insertions(+)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 5f45115..5aba63a 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1261,6 +1261,13 @@ that setting `fsck.missingemail = ignore` will hide that 
issue.
 This feature is intended to support working with legacy repositories
 which cannot be repaired without disruptive changes.
 
+fsck.skipList::
+       The path to a sorted list of object names (i.e. one SHA-1 per
+       line) that are known to be broken in a non-fatal way and should
+       be ignored. This feature is useful when an established project
+       should be accepted despite early commits containing errors that
+       can be safely ignored such as invalid committer email addresses.
+
 gc.aggressiveDepth::
        The depth parameter used in the delta compression
        algorithm used by 'git gc --aggressive'.  This defaults
diff --git a/builtin/fsck.c b/builtin/fsck.c
index 75fcb5f..ce538ac 100644
--- a/builtin/fsck.c
+++ b/builtin/fsck.c
@@ -54,6 +54,16 @@ static int fsck_config(const char *var, const char *value, 
void *cb)
                return 0;
        }
 
+       if (strcmp(var, "fsck.skiplist") == 0) {
+               const char *path = is_absolute_path(value) ?
+                       value : git_path("%s", value);
+               struct strbuf sb = STRBUF_INIT;
+               strbuf_addf(&sb, "skiplist=%s", path);
+               fsck_set_msg_types(&fsck_obj_options, sb.buf);
+               strbuf_release(&sb);
+               return 0;
+       }
+
        return git_default_config(var, value, cb);
 }
 
-- 
2.3.1.windows.1.9.g8c01ab4


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