When reporting broken links between commits/trees/blobs, it would be
quite helpful at times if the user would be told how the object is
supposed to be reachable.
With the new --name-objects option, git-fsck will try to do exactly
that: name the objects in a way that shows how they are reachable.
For example, when some reflog got corrupted and a blob is missing that
should not be, the user might want to remove the corresponding reflog
entry. This option helps them find that entry: `git fsck` will now
report something like this:
broken link from tree b5eb6ff... (refs/stash@{<date>}~37:)
to blob ec5cf80...
Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
Documentation/git-fsck.txt | 9 ++++++++-
builtin/fsck.c | 42 ++++++++++++++++++++++++++++++++++++++----
fsck.c | 21 +++++++++++++++++----
t/t1450-fsck.sh | 22 ++++++++++++++++++++++
4 files changed, 85 insertions(+), 9 deletions(-)
diff --git a/Documentation/git-fsck.txt b/Documentation/git-fsck.txt
index 7fc68eb..b9f060e 100644
--- a/Documentation/git-fsck.txt
+++ b/Documentation/git-fsck.txt
@@ -11,7 +11,8 @@ SYNOPSIS
[verse]
'git fsck' [--tags] [--root] [--unreachable] [--cache] [--no-reflogs]
[--[no-]full] [--strict] [--verbose] [--lost-found]
- [--[no-]dangling] [--[no-]progress] [--connectivity-only] [<object>*]
+ [--[no-]dangling] [--[no-]progress] [--connectivity-only]
+ [--[no-]name-objects] [<object>*]
DESCRIPTION
-----------
@@ -82,6 +83,12 @@ index file, all SHA-1 references in `refs` namespace, and all reflogs
a blob, the contents are written into the file, rather than
its object name.
+--name-objects::
+ When displaying names of reachable objects, in addition to the
+ SHA-1 also display a name that describes *how* they are reachable,
+ compatible with linkgit:git-rev-parse[1], e.g.
+ `HEAD@{1234567890}~25^2:src/`.
+
--[no-]progress::
Progress status is reported on the standard error stream by
default when it is attached to a terminal, unless
diff --git a/builtin/fsck.c b/builtin/fsck.c
index 6c9d598..49680e9 100644
--- a/builtin/fsck.c
+++ b/builtin/fsck.c
@@ -13,6 +13,7 @@
#include "dir.h"
#include "progress.h"
#include "streaming.h"
+#include "decorate.h"
#define REACHABLE 0x0001
#define SEEN 0x0002
@@ -35,6 +36,7 @@ static int write_lost_and_found;
static int verbose;
static int show_progress = -1;
static int show_dangling = 1;
+static int name_objects = 0;
#define ERROR_OBJECT 01
#define ERROR_REACHABLE 02
#define ERROR_PACK 04
@@ -42,7 +44,16 @@ static int show_dangling = 1;
static const char *describe_object(struct object *obj)
{
- return oid_to_hex(&obj->oid);
+ static struct strbuf buf = STRBUF_INIT;
+ char *name = name_objects ?
+ lookup_decoration(fsck_walk_options.object_names, obj) : NULL;
+
+ strbuf_reset(&buf);
+ strbuf_addstr(&buf, oid_to_hex(&obj->oid));
+ if (name)
+ strbuf_addf(&buf, " (%s)", name);
+
+ return buf.buf;
}
static int fsck_config(const char *var, const char *value, void *cb)
@@ -378,13 +389,18 @@ static int fsck_obj_buffer(const unsigned char *sha1, enum object_type type,
static int default_refs;
-static void fsck_handle_reflog_sha1(const char *refname, unsigned char *sha1)
+static void fsck_handle_reflog_sha1(const char *refname, unsigned char *sha1,
+ unsigned long timestamp)
{
struct object *obj;
if (!is_null_sha1(sha1)) {
obj = lookup_object(sha1);
if (obj) {
+ if (timestamp && name_objects)
+ add_decoration(fsck_walk_options.object_names,
+ obj,
+ xstrfmt("%s@{%ld}", refname, timestamp));
obj->used = 1;
mark_object_reachable(obj);
} else {
@@ -404,8 +420,8 @@ static int fsck_handle_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
fprintf(stderr, "Checking reflog %s->%s\n",
sha1_to_hex(osha1), sha1_to_hex(nsha1));
- fsck_handle_reflog_sha1(refname, osha1);
- fsck_handle_reflog_sha1(refname, nsha1);
+ fsck_handle_reflog_sha1(refname, osha1, 0);
+ fsck_handle_reflog_sha1(refname, nsha1, timestamp);
return 0;
}
@@ -434,6 +450,9 @@ static int fsck_handle_ref(const char *refname, const struct object_id *oid,
}
default_refs++;
obj->used = 1;
+ if (name_objects)
+ add_decoration(fsck_walk_options.object_names,
+ obj, xstrdup(refname));
mark_object_reachable(obj);
return 0;
@@ -549,6 +568,9 @@ static int fsck_cache_tree(struct cache_tree *it)
return 1;
}
obj->used = 1;
+ if (name_objects)
+ add_decoration(fsck_walk_options.object_names,
+ obj, xstrdup(":"));
mark_object_reachable(obj);
if (obj->type != OBJ_TREE)
err |= objerror(obj, "non-tree in cache-tree");
@@ -577,6 +599,7 @@ static struct option fsck_opts[] = {
OPT_BOOL(0, "lost-found", &write_lost_and_found,
N_("write dangling objects in .git/lost-found")),
OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
+ OPT_BOOL(0, "name-objects", &name_objects, N_("show verbose names for reachable objects")),
OPT_END(),
};
@@ -606,6 +629,10 @@ int cmd_fsck(int argc, const char **argv, const char *prefix)
include_reflogs = 0;
}
+ if (name_objects)
+ fsck_walk_options.object_names =
+ xcalloc(1, sizeof(struct decoration));
+
git_config(fsck_config, NULL);
fsck_head_link();
@@ -661,6 +688,9 @@ int cmd_fsck(int argc, const char **argv, const char *prefix)
continue;
obj->used = 1;
+ if (name_objects)
+ add_decoration(fsck_walk_options.object_names,
+ obj, xstrdup(arg));
mark_object_reachable(obj);
heads++;
continue;
@@ -693,6 +723,10 @@ int cmd_fsck(int argc, const char **argv, const char *prefix)
continue;
obj = &blob->object;
obj->used = 1;
+ if (name_objects)
+ add_decoration(fsck_walk_options.object_names,
+ obj,
+ xstrfmt(":%s", active_cache[i]->name));
mark_object_reachable(obj);
}
if (active_cache_tree)
diff --git a/fsck.c b/fsck.c
index 828c5c6..c9cf3de 100644
--- a/fsck.c
+++ b/fsck.c
@@ -323,6 +323,19 @@ static void put_object_name(struct fsck_options *options, struct object *obj,
va_end(ap);
}
+static const char *describe_object(struct fsck_options *o, struct object *obj)
+{
+ static struct strbuf buf = STRBUF_INIT;
+ char *name;
+
+ strbuf_reset(&buf);
+ strbuf_addstr(&buf, oid_to_hex(&obj->oid));
+ if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
+ strbuf_addf(&buf, " (%s)", name);
+
+ return buf.buf;
+}
+
static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
{
struct tree_desc desc;
@@ -358,7 +371,7 @@ static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *op
}
else {
result = error("in tree %s: entry %s has bad mode %.6o",
- oid_to_hex(&tree->object.oid), entry.path, entry.mode);
+ describe_object(options, &tree->object), entry.path, entry.mode);
}
if (result < 0)
return result;
@@ -454,7 +467,7 @@ int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
case OBJ_TAG:
return fsck_walk_tag((struct tag *)obj, data, options);
default:
- error("Unknown object type for %s", oid_to_hex(&obj->oid));
+ error("Unknown object type for %s", describe_object(options, obj));
return -1;
}
}
@@ -901,9 +914,9 @@ int fsck_error_function(struct fsck_options *o,
struct object *obj, int msg_type, const char *message)
{
if (msg_type == FSCK_WARN) {
- warning("object %s: %s", oid_to_hex(&obj->oid), message);
+ warning("object %s: %s", describe_object(o, obj), message);
return 0;
}
- error("object %s: %s", oid_to_hex(&obj->oid), message);
+ error("object %s: %s", describe_object(o, obj), message);
return 1;
}
diff --git a/t/t1450-fsck.sh b/t/t1450-fsck.sh
index 7ee8ea0..8f52da2 100755
--- a/t/t1450-fsck.sh
+++ b/t/t1450-fsck.sh
@@ -523,4 +523,26 @@ test_expect_success 'fsck --connectivity-only' '
)
'
+remove_loose_object () {
+ sha1="$(git rev-parse "$1")" &&
+ remainder=${sha1#??} &&
+ firsttwo=${sha1%$remainder} &&
+ rm .git/objects/$firsttwo/$remainder
+}
+
+test_expect_success 'fsck --name-objects' '
+ rm -rf name-objects &&
+ git init name-objects &&
+ (
+ cd name-objects &&
+ test_commit julius caesar.t &&
+ test_commit augustus &&
+ test_commit caesar &&
+ remove_loose_object $(git rev-parse julius:caesar.t) &&
+ test_must_fail git fsck --name-objects >out &&
+ tree=$(git rev-parse --verify julius:) &&
+ grep "$tree (\(refs/heads/master\|HEAD\)@{[0-9]*}:" out
+ )
+'
+
test_done
--
2.9.0.281.g286a8d9
--
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