This just discards existing entries from the index, which
can be useful if you are rewriting all entries with
"--index-info" or similar.
Signed-off-by: Jeff King <peff@xxxxxxxx>
---
I tried to make something like:
git update-index --from-scratch --index-info
work by avoiding reading all entries in the first place. However,
update-index actually processes its arguments sequentially, so we _must_
read the index before we start processing arguments. But because it's
sequential, a "clear" operation makes sense, since you clear, then add
new entries.
Documentation/git-update-index.txt | 3 +++
builtin/update-index.c | 10 ++++++++++
2 files changed, 13 insertions(+)
diff --git a/Documentation/git-update-index.txt b/Documentation/git-update-index.txt
index a3081f4..47f0ae6 100644
--- a/Documentation/git-update-index.txt
+++ b/Documentation/git-update-index.txt
@@ -71,6 +71,9 @@ OPTIONS
--cacheinfo <mode> <object> <path>::
Directly insert the specified info into the index.
+--clear::
+ Discard all existing entries from the index.
+
--index-info::
Read index information from stdin.
diff --git a/builtin/update-index.c b/builtin/update-index.c
index a6a23fa..559dfae 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -645,6 +645,13 @@ static int cacheinfo_callback(struct parse_opt_ctx_t *ctx,
return 0;
}
+static int clear_callback(const struct option *opt,
+ const char *arg, int unset)
+{
+ discard_cache();
+ return 0;
+}
+
static int stdin_cacheinfo_callback(struct parse_opt_ctx_t *ctx,
const struct option *opt, int unset)
{
@@ -774,6 +781,9 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
"add entries from standard input to the index",
PARSE_OPT_NONEG | PARSE_OPT_NOARG,
(parse_opt_cb *) stdin_cacheinfo_callback},
+ {OPTION_CALLBACK, 0, "clear", NULL, NULL,
+ "drop all index entries", PARSE_OPT_NONEG | PARSE_OPT_NOARG,
+ clear_callback},
{OPTION_LOWLEVEL_CALLBACK, 0, "unresolve", &has_errors, NULL,
"repopulate stages #2 and #3 for the listed paths",
PARSE_OPT_NONEG | PARSE_OPT_NOARG,
--
1.7.9.6.8.g992e5
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