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-rw-r--r--Documentation/git-format-patch.txt54
-rw-r--r--builtin/log.c139
-rwxr-xr-xt/t4014-format-patch.sh47
3 files changed, 240 insertions, 0 deletions
diff --git a/Documentation/git-format-patch.txt b/Documentation/git-format-patch.txt
index 6821441..1d790f1 100644
--- a/Documentation/git-format-patch.txt
+++ b/Documentation/git-format-patch.txt
@@ -265,6 +265,11 @@ 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 state the
+ patch series applies to. See the BASE TREE INFORMATION section
+ below for details.
+
--root::
Treat the revision argument as a <revision range>, even if it
is just a single commit (that would normally be treated as a
@@ -520,6 +525,55 @@ This should help you to submit patches inline using KMail.
5. Back in the compose window: add whatever other text you wish to the
message, complete the addressing and subject fields, and press send.
+BASE TREE INFORMATION
+---------------------
+
+The base tree information block is used for maintainers or third party
+testers to know the exact state the patch series applies to. It consists
+of the 'base commit', which is a well-known commit that is part of the
+stable part of the project history everybody else works off of, and zero
+or more 'prerequisite patches', which are well-known patches in flight
+that is not yet part of the 'base commit' that need to be applied on top
+of 'base commit' in topological order before the patches can be applied.
+
+The 'base commit' is shown as "base-commit: " followed by the 40-hex of
+the commit object name. A 'prerequisite patch' is shown as
+"prerequisite-patch-id: " followed by the 40-hex 'patch id', which can
+be obtained by passing the patch through the `git patch-id --stable`
+command.
+
+Imagine that on top of the public commit P, you applied well-known
+patches X, Y and Z from somebody else, and then built your three-patch
+series A, B, C, the history would be like:
+
+................................................
+---P---X---Y---Z---A---B---C
+................................................
+
+With `git format-patch --base=P -3 C` (or variants thereof, e.g. with
+`--cover-letter` of using `Z..C` instead of `-3 C` to specify the
+range), the base tree information block is shown at the end of the
+first message the command outputs (either the first patch, or the
+cover letter), like this:
+
+------------
+base-commit: P
+prerequisite-patch-id: X
+prerequisite-patch-id: Y
+prerequisite-patch-id: Z
+------------
+
+For non-linear topology, such as
+
+................................................
+---P---X---A---M---C
+ \ /
+ Y---Z---B
+................................................
+
+You can 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.
EXAMPLES
--------
diff --git a/builtin/log.c b/builtin/log.c
index 0d738d6..c9ee333 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -1185,6 +1185,131 @@ 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 struct commit *get_base_commit(const char *base_commit,
+ struct commit **list,
+ int total)
+{
+ struct commit *base = NULL;
+ struct commit **rev;
+ int i = 0, rev_nr = 0;
+
+ base = lookup_commit_reference_by_name(base_commit);
+ if (!base)
+ die(_("Unknown commit %s"), base_commit);
+
+ ALLOC_ARRAY(rev, total);
+ for (i = 0; i < total; i++)
+ rev[i] = list[i];
+
+ rev_nr = total;
+ /*
+ * Get merge base through pair-wise computations
+ * and store it in rev[0].
+ */
+ while (rev_nr > 1) {
+ for (i = 0; i < rev_nr / 2; i++) {
+ struct commit_list *merge_base;
+ merge_base = get_merge_bases(rev[2 * i], rev[2 * i + 1]);
+ if (!merge_base || merge_base->next)
+ die(_("Failed to find exact merge base"));
+
+ rev[i] = merge_base->item;
+ }
+
+ if (rev_nr % 2)
+ rev[i] = rev[2 * i];
+ rev_nr = (rev_nr + 1) / 2;
+ }
+
+ if (!in_merge_bases(base, rev[0]))
+ die(_("base commit should be the ancestor of revision list"));
+
+ for (i = 0; i < total; i++) {
+ if (base == list[i])
+ die(_("base commit shouldn't be in revision list"));
+ }
+
+ free(rev);
+ return base;
+}
+
+static void prepare_bases(struct base_tree_info *bases,
+ struct commit *base,
+ struct commit **list,
+ int total)
+{
+ struct commit *commit;
+ struct rev_info revs;
+ struct diff_options diffopt;
+ int i;
+
+ if (!base)
+ return;
+
+ diff_setup(&diffopt);
+ DIFF_OPT_SET(&diffopt, RECURSIVE);
+ diff_setup_done(&diffopt);
+
+ oidcpy(&bases->base_commit, &base->object.oid);
+
+ init_revisions(&revs, NULL);
+ revs.max_parents = 1;
+ revs.topo_order = 1;
+ for (i = 0; i < total; i++) {
+ list[i]->object.flags &= ~UNINTERESTING;
+ add_pending_object(&revs, &list[i]->object, "rev_list");
+ list[i]->util = (void *)1;
+ }
+ base->object.flags |= UNINTERESTING;
+ add_pending_object(&revs, &base->object, "base");
+
+ if (prepare_revision_walk(&revs))
+ die(_("revision walk setup failed"));
+ /*
+ * Traverse the commits list, get prerequisite patch ids
+ * and stuff them in bases structure.
+ */
+ while ((commit = get_revision(&revs)) != NULL) {
+ unsigned char sha1[20];
+ struct object_id *patch_id;
+ 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 = bases->nr_patch_id - 1; i >= 0; 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 +1334,9 @@ 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 +1399,8 @@ 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 +1637,13 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
signature = strbuf_detach(&buf, NULL);
}
+ memset(&bases, 0, sizeof(bases));
+ if (base_commit) {
+ struct commit *base = get_base_commit(base_commit, list, nr);
+ reset_revision_walk();
+ prepare_bases(&bases, base, 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 +1657,7 @@ 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 +1723,7 @@ 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);
diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index 3b99434..edf07ee 100755
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -1460,4 +1460,51 @@ test_expect_success 'format-patch -o overrides format.outputDirectory' '
test_path_is_dir patchset
'
+test_expect_success 'format-patch --base' '
+ git checkout side &&
+ git format-patch --stdout --base=HEAD~3 -1 >patch &&
+ grep "^base-commit:" patch >actual &&
+ grep "^prerequisite-patch-id:" patch >>actual &&
+ echo "base-commit: $(git rev-parse HEAD~3)" >expected &&
+ echo "prerequisite-patch-id: $(git show --patch HEAD~2 | git patch-id --stable | awk "{print \$1}")" >>expected &&
+ echo "prerequisite-patch-id: $(git show --patch HEAD~1 | git patch-id --stable | awk "{print \$1}")" >>expected &&
+ test_cmp expected actual
+'
+
+test_expect_success 'format-patch --base errors out when base commit is in revision list' '
+ test_must_fail git format-patch --base=HEAD -2 &&
+ test_must_fail git format-patch --base=HEAD~1 -2 &&
+ git format-patch --stdout --base=HEAD~2 -2 >patch &&
+ grep "^base-commit:" patch >actual &&
+ echo "base-commit: $(git rev-parse HEAD~2)" >expected &&
+ test_cmp expected actual
+'
+
+test_expect_success 'format-patch --base errors out when base commit is not ancestor of revision list' '
+ # For history as below:
+ #
+ # ---Q---P---Z---Y---*---X
+ # \ /
+ # ------------W
+ #
+ # If "format-patch Z..X" is given, P and Z can not be specified as the base commit
+ git checkout -b topic1 master &&
+ git rev-parse HEAD >commit-id-base &&
+ test_commit P &&
+ git rev-parse HEAD >commit-id-P &&
+ test_commit Z &&
+ git rev-parse HEAD >commit-id-Z &&
+ test_commit Y &&
+ git checkout -b topic2 master &&
+ test_commit W &&
+ git merge topic1 &&
+ test_commit X &&
+ test_must_fail git format-patch --base=$(cat commit-id-P) -3 &&
+ test_must_fail git format-patch --base=$(cat commit-id-Z) -3 &&
+ git format-patch --stdout --base=$(cat commit-id-base) -3 >patch &&
+ grep "^base-commit:" patch >actual &&
+ echo "base-commit: $(cat commit-id-base)" >expected &&
+ test_cmp expected actual
+'
+
test_done