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 |  8 ++++++++
 builtin/fsck.c           | 13 +++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index ed7f37f..69dda93 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1261,6 +1261,14 @@ 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.
+       Note: corrupt objects cannot be skipped with this setting.
+
 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 2d14298..7e3df20 100644
--- a/builtin/fsck.c
+++ b/builtin/fsck.c
@@ -49,6 +49,19 @@ static int show_dangling = 1;
 
 static int fsck_config(const char *var, const char *value, void *cb)
 {
+       if (strcmp(var, "fsck.skiplist") == 0) {
+               const char *path;
+               struct strbuf sb = STRBUF_INIT;
+
+               if (git_config_pathname(&path, var, value))
+                       return 1;
+               strbuf_addf(&sb, "skiplist=%s", path);
+               free((char *) path);
+               fsck_set_msg_types(&fsck_obj_options, sb.buf);
+               strbuf_release(&sb);
+               return 0;
+       }
+
        if (skip_prefix(var, "fsck.", &var)) {
                fsck_set_msg_type(&fsck_obj_options, var, value);
                return 0;
-- 
2.3.1.windows.1.9.g8c01ab4


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