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authorLibravatar Jeff King <peff@peff.net>2016-09-27 08:38:01 -0400
committerLibravatar Junio C Hamano <gitster@pobox.com>2016-09-27 10:29:56 -0700
commit5b33cb1fd733f581da07ae8afa7e9547eafd248e (patch)
tree439c5016deef9764172bca39e773ecaba2fec330
parentget_short_sha1: list ambiguous objects on error (diff)
downloadtgif-5b33cb1fd733f581da07ae8afa7e9547eafd248e.tar.xz
get_short_sha1: make default disambiguation configurable
When we find ambiguous short sha1s, we may get a disambiguation rule from our caller's context. But if we don't, we fall back to treating all sha1s the same, even though most projects will tend to refer only to commits by their short sha1s. This patch introduces a configuration option that lets the user pick a different fallback (e.g., only commits). It's possible that we may want to make this the default, but it's a good idea to start as a config option for two reasons: 1. It lets people experiment with this and see if it's a good idea (i.e., the "tend to" above is an assumption; we don't really know if this will break some obscure cases). 2. Even if we do flip the default, it gives people an escape hatch if it causes problems (you can sometimes override it by asking for "1234^{tree}", but not all combinations are possible). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--cache.h2
-rw-r--r--config.c3
-rw-r--r--sha1_name.c32
-rwxr-xr-xt/t1512-rev-parse-disambiguation.sh14
4 files changed, 51 insertions, 0 deletions
diff --git a/cache.h b/cache.h
index 7bd78ca282..f346c01708 100644
--- a/cache.h
+++ b/cache.h
@@ -1222,6 +1222,8 @@ extern int get_oid(const char *str, struct object_id *oid);
typedef int each_abbrev_fn(const unsigned char *sha1, void *);
extern int for_each_abbrev(const char *prefix, each_abbrev_fn, void *);
+extern int set_disambiguate_hint_config(const char *var, const char *value);
+
/*
* Try to read a SHA1 in hexadecimal format from the 40 characters
* starting at hex. Write the 20-byte result to sha1 in binary form.
diff --git a/config.c b/config.c
index 1e4b6178f7..83fdecb1bc 100644
--- a/config.c
+++ b/config.c
@@ -841,6 +841,9 @@ static int git_default_core_config(const char *var, const char *value)
return 0;
}
+ if (!strcmp(var, "core.disambiguate"))
+ return set_disambiguate_hint_config(var, value);
+
if (!strcmp(var, "core.loosecompression")) {
int level = git_config_int(var, value);
if (level == -1)
diff --git a/sha1_name.c b/sha1_name.c
index 0513f148f1..3b647fd7cf 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -283,6 +283,36 @@ static int disambiguate_blob_only(const unsigned char *sha1, void *cb_data_unuse
return kind == OBJ_BLOB;
}
+static disambiguate_hint_fn default_disambiguate_hint;
+
+int set_disambiguate_hint_config(const char *var, const char *value)
+{
+ static const struct {
+ const char *name;
+ disambiguate_hint_fn fn;
+ } hints[] = {
+ { "none", NULL },
+ { "commit", disambiguate_commit_only },
+ { "committish", disambiguate_committish_only },
+ { "tree", disambiguate_tree_only },
+ { "treeish", disambiguate_treeish_only },
+ { "blob", disambiguate_blob_only }
+ };
+ int i;
+
+ if (!value)
+ return config_error_nonbool(var);
+
+ for (i = 0; i < ARRAY_SIZE(hints); i++) {
+ if (!strcasecmp(value, hints[i].name)) {
+ default_disambiguate_hint = hints[i].fn;
+ return 0;
+ }
+ }
+
+ return error("unknown hint type for '%s': %s", var, value);
+}
+
static int init_object_disambiguation(const char *name, int len,
struct disambiguate_state *ds)
{
@@ -373,6 +403,8 @@ static int get_short_sha1(const char *name, int len, unsigned char *sha1,
ds.fn = disambiguate_treeish_only;
else if (flags & GET_SHA1_BLOB)
ds.fn = disambiguate_blob_only;
+ else
+ ds.fn = default_disambiguate_hint;
find_short_object_filename(&ds);
find_short_packed_object(&ds);
diff --git a/t/t1512-rev-parse-disambiguation.sh b/t/t1512-rev-parse-disambiguation.sh
index c5447ef877..7c659eb585 100755
--- a/t/t1512-rev-parse-disambiguation.sh
+++ b/t/t1512-rev-parse-disambiguation.sh
@@ -347,4 +347,18 @@ test_expect_success C_LOCALE_OUTPUT 'failed type-selector still shows hint' '
test_line_count = 3 hints
'
+test_expect_success 'core.disambiguate config can prefer types' '
+ # ambiguous between tree and tag
+ sha1=0000000000f &&
+ test_must_fail git rev-parse $sha1 &&
+ git rev-parse $sha1^{commit} &&
+ git -c core.disambiguate=committish rev-parse $sha1
+'
+
+test_expect_success 'core.disambiguate does not override context' '
+ # treeish ambiguous between tag and tree
+ test_must_fail \
+ git -c core.disambiguate=committish rev-parse $sha1^{tree}
+'
+
test_done