git notes merge: Initial implementation handling trivial merges only
This initial implementation of 'git notes merge' only handles the trivial merge cases (i.e. where the merge is either a no-op, or a fast-forward). The patch includes testcases for these trivial merge cases. Future patches will extend the functionality of 'git notes merge'. This patch has been improved by the following contributions: - Stephen Boyd: Simplify argc logic - Stephen Boyd: Use test_commit - Ævar Arnfjörð Bjarmason: Don't use C99 comments. - Jonathan Nieder: Add constants for common verbosity values - Jonathan Nieder: Use trace_printf(...) instead of OUTPUT(o, 5, ...) - Jonathan Nieder: Remove extraneous show() function - Jonathan Nieder: Clarify handling of empty/missing notes ref in notes_merge() - Junio C Hamano: fixup minor style issues Thanks-to: Stephen Boyd <bebarino@gmail.com> Thanks-to: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Thanks-to: Jonathan Nieder <jrnieder@gmail.com> Thanks-to: Junio C Hamano <gitster@pobox.com> Signed-off-by: Johan Herland <johan@herland.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johan Herland
committed by
Junio C Hamano
Junio C Hamano
parent
8ef313e1ec
commit
75ef3f4a5c
2
Makefile
2
Makefile
@ -503,6 +503,7 @@ LIB_H += mailmap.h
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LIB_H += merge-recursive.h
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LIB_H += notes.h
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LIB_H += notes-cache.h
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LIB_H += notes-merge.h
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LIB_H += object.h
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LIB_H += pack.h
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LIB_H += pack-refs.h
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@ -593,6 +594,7 @@ LIB_OBJS += merge-recursive.o
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LIB_OBJS += name-hash.o
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LIB_OBJS += notes.o
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LIB_OBJS += notes-cache.o
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LIB_OBJS += notes-merge.o
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LIB_OBJS += object.o
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LIB_OBJS += pack-check.o
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LIB_OBJS += pack-refs.o
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@ -17,6 +17,7 @@
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#include "run-command.h"
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#include "parse-options.h"
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#include "string-list.h"
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#include "notes-merge.h"
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static const char * const git_notes_usage[] = {
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"git notes [--ref <notes_ref>] [list [<object>]]",
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@ -25,6 +26,7 @@ static const char * const git_notes_usage[] = {
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"git notes [--ref <notes_ref>] append [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]",
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"git notes [--ref <notes_ref>] edit [<object>]",
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"git notes [--ref <notes_ref>] show [<object>]",
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"git notes [--ref <notes_ref>] merge [-v | -q] <notes_ref>",
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"git notes [--ref <notes_ref>] remove [<object>]",
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"git notes [--ref <notes_ref>] prune [-n | -v]",
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NULL
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@ -61,6 +63,11 @@ static const char * const git_notes_show_usage[] = {
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NULL
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};
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static const char * const git_notes_merge_usage[] = {
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"git notes merge [<options>] <notes_ref>",
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NULL
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};
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static const char * const git_notes_remove_usage[] = {
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"git notes remove [<object>]",
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NULL
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@ -772,6 +779,51 @@ static int show(int argc, const char **argv, const char *prefix)
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return retval;
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}
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static int merge(int argc, const char **argv, const char *prefix)
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{
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struct strbuf remote_ref = STRBUF_INIT, msg = STRBUF_INIT;
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unsigned char result_sha1[20];
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struct notes_merge_options o;
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int verbosity = 0, result;
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struct option options[] = {
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OPT__VERBOSITY(&verbosity),
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OPT_END()
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};
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argc = parse_options(argc, argv, prefix, options,
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git_notes_merge_usage, 0);
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if (argc != 1) {
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error("Must specify a notes ref to merge");
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usage_with_options(git_notes_merge_usage, options);
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}
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init_notes_merge_options(&o);
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o.verbosity = verbosity + NOTES_MERGE_VERBOSITY_DEFAULT;
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o.local_ref = default_notes_ref();
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strbuf_addstr(&remote_ref, argv[0]);
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expand_notes_ref(&remote_ref);
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o.remote_ref = remote_ref.buf;
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result = notes_merge(&o, result_sha1);
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strbuf_addf(&msg, "notes: Merged notes from %s into %s",
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remote_ref.buf, default_notes_ref());
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if (result == 0) { /* Merge resulted (trivially) in result_sha1 */
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/* Update default notes ref with new commit */
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update_ref(msg.buf, default_notes_ref(), result_sha1, NULL,
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0, DIE_ON_ERR);
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} else {
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/* TODO: */
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die("'git notes merge' cannot yet handle non-trivial merges!");
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}
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strbuf_release(&remote_ref);
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strbuf_release(&msg);
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return 0;
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}
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static int remove_cmd(int argc, const char **argv, const char *prefix)
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{
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struct option options[] = {
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@ -865,6 +917,8 @@ int cmd_notes(int argc, const char **argv, const char *prefix)
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result = append_edit(argc, argv, prefix);
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else if (!strcmp(argv[0], "show"))
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result = show(argc, argv, prefix);
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else if (!strcmp(argv[0], "merge"))
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result = merge(argc, argv, prefix);
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else if (!strcmp(argv[0], "remove"))
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result = remove_cmd(argc, argv, prefix);
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else if (!strcmp(argv[0], "prune"))
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120
notes-merge.c
Normal file
120
notes-merge.c
Normal file
@ -0,0 +1,120 @@
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#include "cache.h"
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#include "commit.h"
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#include "refs.h"
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#include "notes-merge.h"
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void init_notes_merge_options(struct notes_merge_options *o)
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{
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memset(o, 0, sizeof(struct notes_merge_options));
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o->verbosity = NOTES_MERGE_VERBOSITY_DEFAULT;
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}
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#define OUTPUT(o, v, ...) \
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do { \
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if ((o)->verbosity >= (v)) { \
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printf(__VA_ARGS__); \
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puts(""); \
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} \
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} while (0)
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int notes_merge(struct notes_merge_options *o,
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unsigned char *result_sha1)
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{
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unsigned char local_sha1[20], remote_sha1[20];
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struct commit *local, *remote;
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struct commit_list *bases = NULL;
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const unsigned char *base_sha1;
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int result = 0;
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assert(o->local_ref && o->remote_ref);
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hashclr(result_sha1);
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trace_printf("notes_merge(o->local_ref = %s, o->remote_ref = %s)\n",
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o->local_ref, o->remote_ref);
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/* Dereference o->local_ref into local_sha1 */
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if (!resolve_ref(o->local_ref, local_sha1, 0, NULL))
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die("Failed to resolve local notes ref '%s'", o->local_ref);
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else if (!check_ref_format(o->local_ref) && is_null_sha1(local_sha1))
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local = NULL; /* local_sha1 == null_sha1 indicates unborn ref */
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else if (!(local = lookup_commit_reference(local_sha1)))
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die("Could not parse local commit %s (%s)",
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sha1_to_hex(local_sha1), o->local_ref);
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trace_printf("\tlocal commit: %.7s\n", sha1_to_hex(local_sha1));
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/* Dereference o->remote_ref into remote_sha1 */
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if (get_sha1(o->remote_ref, remote_sha1)) {
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/*
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* Failed to get remote_sha1. If o->remote_ref looks like an
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* unborn ref, perform the merge using an empty notes tree.
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*/
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if (!check_ref_format(o->remote_ref)) {
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hashclr(remote_sha1);
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remote = NULL;
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} else {
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die("Failed to resolve remote notes ref '%s'",
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o->remote_ref);
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}
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} else if (!(remote = lookup_commit_reference(remote_sha1))) {
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die("Could not parse remote commit %s (%s)",
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sha1_to_hex(remote_sha1), o->remote_ref);
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}
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trace_printf("\tremote commit: %.7s\n", sha1_to_hex(remote_sha1));
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if (!local && !remote)
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die("Cannot merge empty notes ref (%s) into empty notes ref "
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"(%s)", o->remote_ref, o->local_ref);
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if (!local) {
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/* result == remote commit */
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hashcpy(result_sha1, remote_sha1);
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goto found_result;
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}
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if (!remote) {
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/* result == local commit */
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hashcpy(result_sha1, local_sha1);
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goto found_result;
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}
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assert(local && remote);
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/* Find merge bases */
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bases = get_merge_bases(local, remote, 1);
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if (!bases) {
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base_sha1 = null_sha1;
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OUTPUT(o, 4, "No merge base found; doing history-less merge");
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} else if (!bases->next) {
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base_sha1 = bases->item->object.sha1;
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OUTPUT(o, 4, "One merge base found (%.7s)",
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sha1_to_hex(base_sha1));
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} else {
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/* TODO: How to handle multiple merge-bases? */
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base_sha1 = bases->item->object.sha1;
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OUTPUT(o, 3, "Multiple merge bases found. Using the first "
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"(%.7s)", sha1_to_hex(base_sha1));
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}
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OUTPUT(o, 4, "Merging remote commit %.7s into local commit %.7s with "
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"merge-base %.7s", sha1_to_hex(remote->object.sha1),
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sha1_to_hex(local->object.sha1), sha1_to_hex(base_sha1));
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if (!hashcmp(remote->object.sha1, base_sha1)) {
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/* Already merged; result == local commit */
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OUTPUT(o, 2, "Already up-to-date!");
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hashcpy(result_sha1, local->object.sha1);
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goto found_result;
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}
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if (!hashcmp(local->object.sha1, base_sha1)) {
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/* Fast-forward; result == remote commit */
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OUTPUT(o, 2, "Fast-forward");
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hashcpy(result_sha1, remote->object.sha1);
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goto found_result;
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}
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/* TODO: */
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result = error("notes_merge() cannot yet handle real merges.");
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found_result:
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free_commit_list(bases);
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trace_printf("notes_merge(): result = %i, result_sha1 = %.7s\n",
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result, sha1_to_hex(result_sha1));
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return result;
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}
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36
notes-merge.h
Normal file
36
notes-merge.h
Normal file
@ -0,0 +1,36 @@
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#ifndef NOTES_MERGE_H
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#define NOTES_MERGE_H
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enum notes_merge_verbosity {
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NOTES_MERGE_VERBOSITY_DEFAULT = 2,
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NOTES_MERGE_VERBOSITY_MAX = 5
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};
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struct notes_merge_options {
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const char *local_ref;
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const char *remote_ref;
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int verbosity;
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};
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void init_notes_merge_options(struct notes_merge_options *o);
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/*
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* Merge notes from o->remote_ref into o->local_ref
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*
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* The commits given by the two refs are merged, producing one of the following
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* outcomes:
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*
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* 1. The merge trivially results in an existing commit (e.g. fast-forward or
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* already-up-to-date). The SHA1 of the result is written into 'result_sha1'
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* and 0 is returned.
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* 2. The merge fails. result_sha1 is set to null_sha1, and non-zero returned.
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*
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* Both o->local_ref and o->remote_ref must be given (non-NULL), but either ref
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* (although not both) may refer to a non-existing notes ref, in which case
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* that notes ref is interpreted as an empty notes tree, and the merge
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* trivially results in what the other ref points to.
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*/
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int notes_merge(struct notes_merge_options *o,
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unsigned char *result_sha1);
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#endif
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180
t/t3308-notes-merge.sh
Executable file
180
t/t3308-notes-merge.sh
Executable file
@ -0,0 +1,180 @@
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#!/bin/sh
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#
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# Copyright (c) 2010 Johan Herland
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#
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test_description='Test merging of notes trees'
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. ./test-lib.sh
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test_expect_success setup '
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test_commit 1st &&
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test_commit 2nd &&
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test_commit 3rd &&
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test_commit 4th &&
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test_commit 5th &&
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# Create notes on 4 first commits
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git config core.notesRef refs/notes/x &&
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git notes add -m "Notes on 1st commit" 1st &&
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git notes add -m "Notes on 2nd commit" 2nd &&
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git notes add -m "Notes on 3rd commit" 3rd &&
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git notes add -m "Notes on 4th commit" 4th
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'
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commit_sha1=$(git rev-parse 1st^{commit})
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commit_sha2=$(git rev-parse 2nd^{commit})
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commit_sha3=$(git rev-parse 3rd^{commit})
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commit_sha4=$(git rev-parse 4th^{commit})
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commit_sha5=$(git rev-parse 5th^{commit})
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verify_notes () {
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notes_ref="$1"
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git -c core.notesRef="refs/notes/$notes_ref" notes |
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sort >"output_notes_$notes_ref" &&
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test_cmp "expect_notes_$notes_ref" "output_notes_$notes_ref" &&
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git -c core.notesRef="refs/notes/$notes_ref" log --format="%H %s%n%N" \
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>"output_log_$notes_ref" &&
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test_cmp "expect_log_$notes_ref" "output_log_$notes_ref"
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}
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cat <<EOF | sort >expect_notes_x
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5e93d24084d32e1cb61f7070505b9d2530cca987 $commit_sha4
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8366731eeee53787d2bdf8fc1eff7d94757e8da0 $commit_sha3
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eede89064cd42441590d6afec6c37b321ada3389 $commit_sha2
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daa55ffad6cb99bf64226532147ffcaf5ce8bdd1 $commit_sha1
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EOF
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cat >expect_log_x <<EOF
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$commit_sha5 5th
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$commit_sha4 4th
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Notes on 4th commit
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$commit_sha3 3rd
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Notes on 3rd commit
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$commit_sha2 2nd
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Notes on 2nd commit
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$commit_sha1 1st
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Notes on 1st commit
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EOF
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test_expect_success 'verify initial notes (x)' '
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verify_notes x
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'
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cp expect_notes_x expect_notes_y
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cp expect_log_x expect_log_y
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test_expect_success 'fail to merge empty notes ref into empty notes ref (z => y)' '
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test_must_fail git -c "core.notesRef=refs/notes/y" notes merge z
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'
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test_expect_success 'fail to merge into various non-notes refs' '
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test_must_fail git -c "core.notesRef=refs/notes" notes merge x &&
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test_must_fail git -c "core.notesRef=refs/notes/" notes merge x &&
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mkdir -p .git/refs/notes/dir &&
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test_must_fail git -c "core.notesRef=refs/notes/dir" notes merge x &&
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test_must_fail git -c "core.notesRef=refs/notes/dir/" notes merge x &&
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test_must_fail git -c "core.notesRef=refs/heads/master" notes merge x &&
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test_must_fail git -c "core.notesRef=refs/notes/y:" notes merge x &&
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test_must_fail git -c "core.notesRef=refs/notes/y:foo" notes merge x &&
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test_must_fail git -c "core.notesRef=refs/notes/foo^{bar" notes merge x
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'
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test_expect_success 'fail to merge various non-note-trees' '
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git config core.notesRef refs/notes/y &&
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test_must_fail git notes merge refs/notes &&
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test_must_fail git notes merge refs/notes/ &&
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test_must_fail git notes merge refs/notes/dir &&
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test_must_fail git notes merge refs/notes/dir/ &&
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test_must_fail git notes merge refs/heads/master &&
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test_must_fail git notes merge x: &&
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test_must_fail git notes merge x:foo &&
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test_must_fail git notes merge foo^{bar
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'
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test_expect_success 'merge notes into empty notes ref (x => y)' '
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git config core.notesRef refs/notes/y &&
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git notes merge x &&
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verify_notes y &&
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# x and y should point to the same notes commit
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test "$(git rev-parse refs/notes/x)" = "$(git rev-parse refs/notes/y)"
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'
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test_expect_success 'merge empty notes ref (z => y)' '
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git notes merge z &&
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# y should not change (still == x)
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test "$(git rev-parse refs/notes/x)" = "$(git rev-parse refs/notes/y)"
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'
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test_expect_success 'change notes on other notes ref (y)' '
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# Not touching notes to 1st commit
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git notes remove 2nd &&
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git notes append -m "More notes on 3rd commit" 3rd &&
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git notes add -f -m "New notes on 4th commit" 4th &&
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git notes add -m "Notes on 5th commit" 5th
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'
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test_expect_success 'merge previous notes commit (y^ => y) => No-op' '
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pre_state="$(git rev-parse refs/notes/y)" &&
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git notes merge y^ &&
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# y should not move
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test "$pre_state" = "$(git rev-parse refs/notes/y)"
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'
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cat <<EOF | sort >expect_notes_y
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0f2efbd00262f2fd41dfae33df8765618eeacd99 $commit_sha5
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dec2502dac3ea161543f71930044deff93fa945c $commit_sha4
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4069cdb399fd45463ec6eef8e051a16a03592d91 $commit_sha3
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daa55ffad6cb99bf64226532147ffcaf5ce8bdd1 $commit_sha1
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EOF
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cat >expect_log_y <<EOF
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$commit_sha5 5th
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Notes on 5th commit
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$commit_sha4 4th
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New notes on 4th commit
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$commit_sha3 3rd
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Notes on 3rd commit
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More notes on 3rd commit
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$commit_sha2 2nd
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$commit_sha1 1st
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Notes on 1st commit
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EOF
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test_expect_success 'verify changed notes on other notes ref (y)' '
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verify_notes y
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'
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|
||||
test_expect_success 'verify unchanged notes on original notes ref (x)' '
|
||||
verify_notes x
|
||||
'
|
||||
|
||||
test_expect_success 'merge original notes (x) into changed notes (y) => No-op' '
|
||||
git notes merge -vvv x &&
|
||||
verify_notes y &&
|
||||
verify_notes x
|
||||
'
|
||||
|
||||
cp expect_notes_y expect_notes_x
|
||||
cp expect_log_y expect_log_x
|
||||
|
||||
test_expect_success 'merge changed (y) into original (x) => Fast-forward' '
|
||||
git config core.notesRef refs/notes/x &&
|
||||
git notes merge y &&
|
||||
verify_notes x &&
|
||||
verify_notes y &&
|
||||
# x and y should point to same the notes commit
|
||||
test "$(git rev-parse refs/notes/x)" = "$(git rev-parse refs/notes/y)"
|
||||
'
|
||||
|
||||
test_done
|
||||
Reference in New Issue
Block a user