on Sat Jun 22 2013, John Keeping <john-AT-keeping.me.uk> wrote:
> On Fri, Jun 21, 2013 at 02:21:47AM -0700, Dave Abrahams wrote:
>> The docs for fast-import seem to imply that I can use "ls" to get the
>> SHA1 of a commit for which I have a mark:
>>
>> Reading from a named tree
>> The <dataref> can be a mark reference (:<idnum>) or the full 40-byte
>
>> SHA-1 of a Git tag, commit, or tree object, preexisting or waiting to
>> be written. The path is relative to the top level of the tree named by
>> <dataref>.
>>
>> 'ls' SP <dataref> SP <path> LF
>>
>> See filemodify above for a detailed description of <path>.
>>
>> Output uses the same format as git ls-tree <tree> -- <path>:
>>
>> <mode> SP ('blob' | 'tree' | 'commit') SP <dataref> HT <path> LF
>>
>> The <dataref> represents the blob, tree, or commit object at <path> and
>> ^^^^^^
>> can be used in later cat-blob, filemodify, or ls commands.
>>
>> but I can't get it to work. It's not entirely clear it's supposed to
>> work. What path would I pass? Passing an empty path simply causes git
>> to report "missing ".
>
> Which version of Git are you using?
,----[ git --version ]
| git version 1.8.3.1
`----
> I just tried this and get the error
> "fatal: Empty path component found in input",
I get that too.
> which seems to be from commit 178e1de (fast-import: don't allow 'ls'
> of path with empty components, 2012-03-09), which is included in Git
> 1.7.9.5.
Yes, that's at least part of the issue. I notice git-fast-import
rejects the root path "" for other commands, e.g. when used as the
source of a filecopy we get the same issue. I also note that the docs
don't make it clear that quoting the path is mandatory if it might turn
out to be empty.
> It seems to be slightly more complicated than that though, because after
> allowing empty trees I get the "missing" message for the root tree.
Yeah, I've tried to patch Git to solve this but ran into that problem
and gave up.
> This seems to be because its mode is 0 and not S_IFDIR.
Aha.
> With the patch below, things are working as I expect
Awesome; works for me, too!
> but I don't understand why the mode of the root is not set correctly
> at this point. Perhaps someone more familiar with fast-import will
> have some insight...
Yeah... there's no bug tracker for Git, right? So if nobody pays
attention to this thread, the problem will persist?
> -- >8 --
> diff --git a/fast-import.c b/fast-import.c
> index 23f625f..bcce651 100644
> --- a/fast-import.c
> +++ b/fast-import.c
> @@ -1626,6 +1626,15 @@ del_entry:
> return 1;
> }
>
> +static void copy_tree_entry(struct tree_entry *dst, struct tree_entry *src)
> +{
> + memcpy(dst, src, sizeof(*dst));
> + if (src->tree && is_null_sha1(src->versions[1].sha1))
> + dst->tree = dup_tree_content(src->tree);
> + else
> + dst->tree = NULL;
> +}
> +
> static int tree_content_get(
> struct tree_entry *root,
> const char *p,
> @@ -1651,11 +1660,7 @@ static int tree_content_get(
> e = t->entries[i];
> if (e->name->str_len == n && !strncmp_icase(p, e->name->str_dat, n)) {
> if (!slash1) {
> - memcpy(leaf, e, sizeof(*leaf));
> - if (e->tree && is_null_sha1(e->versions[1].sha1))
> - leaf->tree = dup_tree_content(e->tree);
> - else
> - leaf->tree = NULL;
> + copy_tree_entry(leaf, e);
> return 1;
> }
> if (!S_ISDIR(e->versions[1].mode))
> @@ -3065,7 +3070,11 @@ static void parse_ls(struct branch *b)
> die("Garbage after path in: %s", command_buf.buf);
> p = uq.buf;
> }
> - tree_content_get(root, p, &leaf);
> + if (!*p) {
> + copy_tree_entry(&leaf, root);
> + leaf.versions[1].mode = S_IFDIR;
> + } else
> + tree_content_get(root, p, &leaf);
> /*
> * A directory in preparation would have a sha1 of zero
> * until it is saved. Save, for simplicity.
--
Dave Abrahams
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