Jeff King <peff@xxxxxxxx> writes:
> The write_entry() function switches on the mode of the entry
> we're going to write out. The cases for S_IFLNK and S_IFREG
> are lumped together. In earlier versions of the code, this
> made some sense. They have a shared preamble (which reads
> the blob content), a short type-specific body, and a shared
> conclusion (which writes out the file contents; always for
> S_IFREG and only sometimes for S_IFLNK).
>
> But over time this has grown to make less sense. The preamble
> now has conditional bits for each type, and the S_IFREG body
> has grown a lot more complicated. It's hard to follow the
> logic of which code is running for which mode.
Nicely done and looks correct. Thanks.
>
> Let's give each mode its own case arm. We will still share
> the conclusion code, which means we now jump to it with a
> goto. Ideally we'd pull that shared code into its own
> function, but it touches so much internal state in the
> write_entry() function that the end result is actually
> harder to follow than the goto.
>
> While we're here, we'll touch up a few bits of whitespace to
> make the beginning and endings of the cases easier to read.
>
> Signed-off-by: Jeff King <peff@xxxxxxxx>
> ---
> entry.c | 71 +++++++++++++++++++++++++++++++++++++----------------------------
> 1 file changed, 40 insertions(+), 31 deletions(-)
>
> diff --git a/entry.c b/entry.c
> index bec51e37a2..206363fd15 100644
> --- a/entry.c
> +++ b/entry.c
> @@ -260,13 +260,31 @@ static int write_entry(struct cache_entry *ce,
> }
>
> switch (ce_mode_s_ifmt) {
> - case S_IFREG:
> case S_IFLNK:
> + new = read_blob_entry(ce, &size);
> + if (!new)
> + return error("unable to read sha1 file of %s (%s)",
> + path, oid_to_hex(&ce->oid));
> +
> + /*
> + * We can't make a real symlink; write out a regular file entry
> + * with the symlink destination as its contents.
> + */
> + if (!has_symlinks || to_tempfile)
> + goto write_file_entry;
> +
> + ret = symlink(new, path);
> + free(new);
> + if (ret)
> + return error_errno("unable to create symlink %s", path);
> + break;
> +
> + case S_IFREG:
> /*
> * We do not send the blob in case of a retry, so do not
> * bother reading it at all.
> */
> - if (ce_mode_s_ifmt == S_IFREG && dco && dco->state == CE_RETRY) {
> + if (dco && dco->state == CE_RETRY) {
> new = NULL;
> size = 0;
> } else {
> @@ -276,42 +294,31 @@ static int write_entry(struct cache_entry *ce,
> path, oid_to_hex(&ce->oid));
> }
>
> - if (ce_mode_s_ifmt == S_IFLNK && has_symlinks && !to_tempfile) {
> - ret = symlink(new, path);
> - free(new);
> - if (ret)
> - return error_errno("unable to create symlink %s",
> - path);
> - break;
> - }
> -
> /*
> * Convert from git internal format to working tree format
> */
> - if (ce_mode_s_ifmt == S_IFREG) {
> - if (dco && dco->state != CE_NO_DELAY) {
> - ret = async_convert_to_working_tree(
> - ce->name, new, size, &buf, dco);
> - if (ret && string_list_has_string(&dco->paths, ce->name)) {
> - free(new);
> - goto delayed;
> - }
> - } else
> - ret = convert_to_working_tree(
> - ce->name, new, size, &buf);
> -
> - if (ret) {
> + if (dco && dco->state != CE_NO_DELAY) {
> + ret = async_convert_to_working_tree(ce->name, new,
> + size, &buf, dco);
> + if (ret && string_list_has_string(&dco->paths, ce->name)) {
> free(new);
> - new = strbuf_detach(&buf, &newsize);
> - size = newsize;
> + goto delayed;
> }
> - /*
> - * No "else" here as errors from convert are OK at this
> - * point. If the error would have been fatal (e.g.
> - * filter is required), then we would have died already.
> - */
> + } else
> + ret = convert_to_working_tree(ce->name, new, size, &buf);
> +
> + if (ret) {
> + free(new);
> + new = strbuf_detach(&buf, &newsize);
> + size = newsize;
> }
> + /*
> + * No "else" here as errors from convert are OK at this
> + * point. If the error would have been fatal (e.g.
> + * filter is required), then we would have died already.
> + */
>
> + write_file_entry:
> fd = open_output_fd(path, ce, to_tempfile);
> if (fd < 0) {
> free(new);
> @@ -326,6 +333,7 @@ static int write_entry(struct cache_entry *ce,
> if (wrote != size)
> return error("unable to write file %s", path);
> break;
> +
> case S_IFGITLINK:
> if (to_tempfile)
> return error("cannot create temporary submodule %s", path);
> @@ -337,6 +345,7 @@ static int write_entry(struct cache_entry *ce,
> NULL, oid_to_hex(&ce->oid),
> state->force ? SUBMODULE_MOVE_HEAD_FORCE : 0);
> break;
> +
> default:
> return error("unknown file mode for %s in index", path);
> }
