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clone: fall back to copying when linking does not work

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We use heuristics to make a decent guess at when we can save time and
space by linking object files during a clone. Unfortunately checking the
device id isn't enough, as those would be the same during e.g. a bind-mount,
but the OS still does not allow us to link between mounts of the same
filesystem.

If we fail to perform the links, fall back to copying the contents into
a new file as a last attempt.
This commit is contained in:
Carlos Martín Nieto 2015-06-01 22:15:11 +02:00
parent be5fda7587
commit 1094073688
1 changed files with 15 additions and 2 deletions
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17
src/clone.c
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@ -532,8 +532,21 @@ static int clone_local_into(git_repository *repo, git_remote *remote, const git_
if (can_link(git_repository_path(src), git_repository_path(repo), link))
flags |= GIT_CPDIR_LINK_FILES;
if ((error = git_futils_cp_r(git_buf_cstr(&src_odb), git_buf_cstr(&dst_odb),
flags, GIT_OBJECT_DIR_MODE)) < 0)
error = git_futils_cp_r(git_buf_cstr(&src_odb), git_buf_cstr(&dst_odb),
flags, GIT_OBJECT_DIR_MODE);
/*
* can_link() doesn't catch all variations, so if we hit an
* error and did want to link, let's try again without trying
* to link.
*/
if (error < 0 && link) {
flags &= ~GIT_CPDIR_LINK_FILES;
error = git_futils_cp_r(git_buf_cstr(&src_odb), git_buf_cstr(&dst_odb),
flags, GIT_OBJECT_DIR_MODE);
}
if (error < 0)
goto cleanup;
git_buf_printf(&reflog_message, "clone: from %s", git_remote_url(remote));