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Merge branch 'jc/sha1-name-object-peeler'

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There was no good way to ask "I have a random string that came from
outside world. I want to turn it into a 40-hex object name while
making sure such an object exists".  A new peeling suffix ^{object}
can be used for that purpose, together with "rev-parse --verify".

* jc/sha1-name-object-peeler:
  peel_onion(): teach $foo^{object} peeler
  peel_onion: disambiguate to favor tree-ish when we know we want a tree-ish
This commit is contained in:
Junio C Hamano 2013-04-03 09:34:53 -07:00
commit 1b7b22bfd0
2 changed files with 10 additions and 1 deletions
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5
Documentation/revisions.txt
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@ -116,6 +116,11 @@ some output processing may assume ref names in UTF-8.
object of that type is found or the object cannot be
dereferenced anymore (in which case, barf). '<rev>{caret}0'
is a short-hand for '<rev>{caret}\{commit\}'.
+
'rev{caret}\{object\}' can be used to make sure 'rev' names an
object that exists, without requiring 'rev' to be a tag, and
without dereferencing 'rev'; because a tag is already an object,
it does not have to be dereferenced even once to get to an object.
'<rev>{caret}\{\}', e.g. 'v0.99.8{caret}\{\}'::
A suffix '{caret}' followed by an empty brace pair

6
sha1_name.c
View File

@ -594,7 +594,7 @@ struct object *peel_to_type(const char *name, int namelen,
while (1) {
if (!o || (!o->parsed && !parse_object(o->sha1)))
return NULL;
if (o->type == expected_type)
if (expected_type == OBJ_ANY || o->type == expected_type)
return o;
if (o->type == OBJ_TAG)
o = ((struct tag*) o)->tagged;
@ -645,6 +645,8 @@ static int peel_onion(const char *name, int len, unsigned char *sha1)
expected_type = OBJ_TREE;
else if (!strncmp(blob_type, sp, 4) && sp[4] == '}')
expected_type = OBJ_BLOB;
else if (!prefixcmp(sp, "object}"))
expected_type = OBJ_ANY;
else if (sp[0] == '}')
expected_type = OBJ_NONE;
else if (sp[0] == '/')
@ -654,6 +656,8 @@ static int peel_onion(const char *name, int len, unsigned char *sha1)
if (expected_type == OBJ_COMMIT)
lookup_flags = GET_SHA1_COMMITTISH;
else if (expected_type == OBJ_TREE)
lookup_flags = GET_SHA1_TREEISH;
if (get_sha1_1(name, sp - name - 2, outer, lookup_flags))
return -1;