Maintainers or third party testers may want to know the exact base tree
the patch series applies to. Teach git format-patch a '--base' option to
record the base tree info and append this information at the end of the
_first_ message (either the cover letter or the first patch in the series).
Helped-by: Junio C Hamano <gits...@pobox.com>
Helped-by: Wu Fengguang <fengguang...@intel.com>
Signed-off-by: Xiaolong Ye <xiaolong...@intel.com>
---
Documentation/git-format-patch.txt | 25 +++++++++++
builtin/log.c | 89 ++++++++++++++++++++++++++++++++++++++
2 files changed, 114 insertions(+)
diff --git a/Documentation/git-format-patch.txt
b/Documentation/git-format-patch.txt
index 6821441..067d562 100644
--- a/Documentation/git-format-patch.txt
+++ b/Documentation/git-format-patch.txt
@@ -265,6 +265,31 @@ you can use `--suffix=-patch` to get
`0001-description-of-my-change-patch`.
Output an all-zero hash in each patch's From header instead
of the hash of the commit.
+--base=<commit>::
+ Record the base tree information to identify the whole tree
+ the patch series applies to. For example, the patch submitter
+ has a commit history of this shape:
+
+ ---P---X---Y---Z---A---B---C
+
+ where "P" is the well-known public commit (e.g. one in Linus's tree),
+ "X", "Y", "Z" are prerequisite patches in flight, and "A", "B", "C"
+ are the work being sent out, the submitter could say "git format-patch
+ --base=P -3 C" (or variants thereof, e.g. with "--cover" or using
+ "Z..C" instead of "-3 C" to specify the range), and the identifiers
+ for P, X, Y, Z are appended at the end of the _first_ message (either
+ the cover letter or the first patch in the series).
+
+ For non-linear topology, such as
+
+ ---P---X---A---M---C
+ \ /
+ Y---Z---B
+
+ the submitter could also use "git format-patch --base=P -3 C" to
generate
+ patches for A, B and C, and the identifiers for P, X, Y, Z are appended
+ at the end of the _first_ message.
+
--root::
Treat the revision argument as a <revision range>, even if it
is just a single commit (that would normally be treated as a
diff --git a/builtin/log.c b/builtin/log.c
index 0d738d6..03cbab0 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -1185,6 +1185,82 @@ static int from_callback(const struct option *opt, const
char *arg, int unset)
return 0;
}
+struct base_tree_info {
+ struct object_id base_commit;
+ int nr_patch_id, alloc_patch_id;
+ struct object_id *patch_id;
+};
+
+static void prepare_bases(struct base_tree_info *bases,
+ const char *base_commit,
+ struct commit **list,
+ int total)
+{
+ struct commit *base = NULL, *commit;
+ struct rev_info revs;
+ struct diff_options diffopt;
+ struct object_id *patch_id;
+ unsigned char sha1[20];
+ int i;
+
+ diff_setup(&diffopt);
+ DIFF_OPT_SET(&diffopt, RECURSIVE);
+ diff_setup_done(&diffopt);
+
+ base = lookup_commit_reference_by_name(base_commit);
+ if (!base)
+ die(_("Unknown commit %s"), base_commit);
+ oidcpy(&bases->base_commit, &base->object.oid);
+
+ init_revisions(&revs, NULL);
+ revs.max_parents = 1;
+ base->object.flags |= UNINTERESTING;
+ add_pending_object(&revs, &base->object, "base");
+ for (i = 0; i < total; i++) {
+ list[i]->object.flags |= 0;
+ add_pending_object(&revs, &list[i]->object, "rev_list");
+ list[i]->util = (void *)1;
+ }
+
+ if (prepare_revision_walk(&revs))
+ die(_("revision walk setup failed"));
+ /*
+ * Traverse the prerequisite commits list,
+ * get the patch ids and stuff them in bases structure.
+ */
+ while ((commit = get_revision(&revs)) != NULL) {
+ if (commit->util)
+ continue;
+ if (commit_patch_id(commit, &diffopt, sha1))
+ die(_("cannot get patch id"));
+ ALLOC_GROW(bases->patch_id, bases->nr_patch_id + 1,
bases->alloc_patch_id);
+ patch_id = bases->patch_id + bases->nr_patch_id;
+ hashcpy(patch_id->hash, sha1);
+ bases->nr_patch_id++;
+ }
+}
+
+static void print_bases(struct base_tree_info *bases)
+{
+ int i;
+
+ /* Only do this once, either for the cover or for the first one */
+ if (is_null_oid(&bases->base_commit))
+ return;
+
+ /* Show the base commit */
+ printf("base-commit: %s\n", oid_to_hex(&bases->base_commit));
+
+ /* Show the prerequisite patches */
+ for (i = 0; i < bases->nr_patch_id; i++)
+ printf("prerequisite-patch-id: %s\n",
oid_to_hex(&bases->patch_id[i]));
+
+ free(bases->patch_id);
+ bases->nr_patch_id = 0;
+ bases->alloc_patch_id = 0;
+ oidclr(&bases->base_commit);
+}
+
int cmd_format_patch(int argc, const char **argv, const char *prefix)
{
struct commit *commit;
@@ -1209,6 +1285,9 @@ int cmd_format_patch(int argc, const char **argv, const
char *prefix)
int reroll_count = -1;
char *branch_name = NULL;
char *from = NULL;
+ char *base_commit = NULL;
+ struct base_tree_info bases;
+
const struct option builtin_format_patch_options[] = {
{ OPTION_CALLBACK, 'n', "numbered", &numbered, NULL,
N_("use [PATCH n/m] even with a single patch"),
@@ -1271,6 +1350,8 @@ int cmd_format_patch(int argc, const char **argv, const
char *prefix)
PARSE_OPT_OPTARG, thread_callback },
OPT_STRING(0, "signature", &signature, N_("signature"),
N_("add a signature")),
+ OPT_STRING(0, "base", &base_commit, N_("base-commit"),
+ N_("add prerequisite tree info to the patch
series")),
OPT_FILENAME(0, "signature-file", &signature_file,
N_("add a signature from a file")),
OPT__QUIET(&quiet, N_("don't print the patch filenames")),
@@ -1507,6 +1588,12 @@ int cmd_format_patch(int argc, const char **argv, const
char *prefix)
signature = strbuf_detach(&buf, NULL);
}
+ if (base_commit) {
+ memset(&bases, 0, sizeof(bases));
+ reset_revision_walk();
+ prepare_bases(&bases, base_commit, list, nr);
+ }
+
if (in_reply_to || thread || cover_letter)
rev.ref_message_ids = xcalloc(1, sizeof(struct string_list));
if (in_reply_to) {
@@ -1520,6 +1607,7 @@ int cmd_format_patch(int argc, const char **argv, const
char *prefix)
gen_message_id(&rev, "cover");
make_cover_letter(&rev, use_stdout,
origin, nr, list, branch_name, quiet);
+ print_bases(&bases);
total++;
start_number--;
}
@@ -1585,6 +1673,7 @@ int cmd_format_patch(int argc, const char **argv, const
char *prefix)
rev.mime_boundary);
else
print_signature();
+ print_bases(&bases);
}
if (!use_stdout)
fclose(stdout);
--
2.8.0.4.gcb5a9af
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