Merge branch 'pk/rebase-in-c-2-basic'
Rewrite "git rebase" in C. * pk/rebase-in-c-2-basic: builtin rebase: support `git rebase <upstream> <switch-to>` builtin rebase: only store fully-qualified refs in `options.head_name` builtin rebase: start a new rebase only if none is in progress builtin rebase: support --force-rebase builtin rebase: try to fast forward when possible builtin rebase: require a clean worktree builtin rebase: support the `verbose` and `diffstat` options builtin rebase: support --quiet builtin rebase: handle the pre-rebase hook and --no-verify builtin rebase: support `git rebase --onto A...B` builtin rebase: support --onto
This commit is contained in:
commit
e0720a3867
334
builtin/rebase.c
334
builtin/rebase.c
@ -16,6 +16,21 @@
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#include "cache-tree.h"
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#include "unpack-trees.h"
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#include "lockfile.h"
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#include "parse-options.h"
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#include "commit.h"
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#include "diff.h"
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#include "wt-status.h"
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#include "revision.h"
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#include "commit-reach.h"
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static char const * const builtin_rebase_usage[] = {
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N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
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"[<upstream>] [<branch>]"),
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N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
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"--root [<branch>]"),
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N_("git rebase --continue | --abort | --skip | --edit-todo"),
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NULL
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};
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static GIT_PATH_FUNC(apply_dir, "rebase-apply")
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static GIT_PATH_FUNC(merge_dir, "rebase-merge")
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@ -59,16 +74,32 @@ struct rebase_options {
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const char *state_dir;
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struct commit *upstream;
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const char *upstream_name;
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const char *upstream_arg;
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char *head_name;
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struct object_id orig_head;
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struct commit *onto;
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const char *onto_name;
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const char *revisions;
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const char *switch_to;
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int root;
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struct commit *restrict_revision;
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int dont_finish_rebase;
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enum {
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REBASE_NO_QUIET = 1<<0,
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REBASE_VERBOSE = 1<<1,
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REBASE_DIFFSTAT = 1<<2,
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REBASE_FORCE = 1<<3,
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REBASE_INTERACTIVE_EXPLICIT = 1<<4,
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} flags;
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struct strbuf git_am_opt;
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};
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static int is_interactive(struct rebase_options *opts)
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{
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return opts->type == REBASE_INTERACTIVE ||
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opts->type == REBASE_PRESERVE_MERGES;
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}
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/* Returns the filename prefixed by the state_dir */
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static const char *state_dir_path(const char *filename, struct rebase_options *opts)
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{
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@ -140,13 +171,25 @@ static int run_specific_rebase(struct rebase_options *opts)
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add_var(&script_snippet, "upstream_name", opts->upstream_name);
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add_var(&script_snippet, "upstream",
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oid_to_hex(&opts->upstream->object.oid));
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add_var(&script_snippet, "head_name", opts->head_name);
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add_var(&script_snippet, "head_name",
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opts->head_name ? opts->head_name : "detached HEAD");
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add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head));
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add_var(&script_snippet, "onto", oid_to_hex(&opts->onto->object.oid));
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add_var(&script_snippet, "onto_name", opts->onto_name);
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add_var(&script_snippet, "revisions", opts->revisions);
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add_var(&script_snippet, "restrict_revision", opts->restrict_revision ?
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oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
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add_var(&script_snippet, "GIT_QUIET",
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opts->flags & REBASE_NO_QUIET ? "" : "t");
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add_var(&script_snippet, "git_am_opt", opts->git_am_opt.buf);
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add_var(&script_snippet, "verbose",
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opts->flags & REBASE_VERBOSE ? "t" : "");
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add_var(&script_snippet, "diffstat",
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opts->flags & REBASE_DIFFSTAT ? "t" : "");
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add_var(&script_snippet, "force_rebase",
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opts->flags & REBASE_FORCE ? "t" : "");
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if (opts->switch_to)
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add_var(&script_snippet, "switch_to", opts->switch_to);
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switch (opts->type) {
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case REBASE_AM:
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@ -213,6 +256,9 @@ static int reset_head(struct object_id *oid, const char *action,
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*old_orig = NULL, oid_old_orig;
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int ret = 0;
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if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
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BUG("Not a fully qualified branch: '%s'", switch_to_branch);
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if (hold_locked_index(&lock, LOCK_REPORT_ON_ERROR) < 0)
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return -1;
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@ -292,15 +338,98 @@ static int reset_head(struct object_id *oid, const char *action,
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return ret;
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}
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static int rebase_config(const char *var, const char *value, void *data)
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{
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struct rebase_options *opts = data;
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if (!strcmp(var, "rebase.stat")) {
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if (git_config_bool(var, value))
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opts->flags |= REBASE_DIFFSTAT;
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else
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opts->flags &= !REBASE_DIFFSTAT;
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return 0;
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}
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return git_default_config(var, value, data);
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}
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/*
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* Determines whether the commits in from..to are linear, i.e. contain
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* no merge commits. This function *expects* `from` to be an ancestor of
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* `to`.
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*/
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static int is_linear_history(struct commit *from, struct commit *to)
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{
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while (to && to != from) {
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parse_commit(to);
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if (!to->parents)
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return 1;
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if (to->parents->next)
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return 0;
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to = to->parents->item;
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}
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return 1;
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}
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static int can_fast_forward(struct commit *onto, struct object_id *head_oid,
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struct object_id *merge_base)
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{
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struct commit *head = lookup_commit(the_repository, head_oid);
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struct commit_list *merge_bases;
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int res;
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if (!head)
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return 0;
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merge_bases = get_merge_bases(onto, head);
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if (merge_bases && !merge_bases->next) {
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oidcpy(merge_base, &merge_bases->item->object.oid);
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res = !oidcmp(merge_base, &onto->object.oid);
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} else {
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oidcpy(merge_base, &null_oid);
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res = 0;
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}
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free_commit_list(merge_bases);
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return res && is_linear_history(onto, head);
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}
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int cmd_rebase(int argc, const char **argv, const char *prefix)
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{
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struct rebase_options options = {
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.type = REBASE_UNSPECIFIED,
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.flags = REBASE_NO_QUIET,
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.git_am_opt = STRBUF_INIT,
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};
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const char *branch_name;
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int ret, flags;
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int ret, flags, in_progress = 0;
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int ok_to_skip_pre_rebase = 0;
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struct strbuf msg = STRBUF_INIT;
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struct strbuf revisions = STRBUF_INIT;
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struct strbuf buf = STRBUF_INIT;
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struct object_id merge_base;
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struct option builtin_rebase_options[] = {
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OPT_STRING(0, "onto", &options.onto_name,
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N_("revision"),
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N_("rebase onto given branch instead of upstream")),
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OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
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N_("allow pre-rebase hook to run")),
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OPT_NEGBIT('q', "quiet", &options.flags,
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N_("be quiet. implies --no-stat"),
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REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
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OPT_BIT('v', "verbose", &options.flags,
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N_("display a diffstat of what changed upstream"),
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REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
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{OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
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N_("do not show diffstat of what changed upstream"),
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PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
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OPT_BIT('f', "force-rebase", &options.flags,
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N_("cherry-pick all commits, even if unchanged"),
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REBASE_FORCE),
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OPT_BIT(0, "no-ff", &options.flags,
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N_("cherry-pick all commits, even if unchanged"),
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REBASE_FORCE),
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OPT_END(),
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};
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/*
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* NEEDSWORK: Once the builtin rebase has been tested enough
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@ -318,13 +447,70 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
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BUG("sane_execvp() returned???");
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}
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if (argc != 2)
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die(_("Usage: %s <base>"), argv[0]);
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if (argc == 2 && !strcmp(argv[1], "-h"))
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usage_with_options(builtin_rebase_usage,
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builtin_rebase_options);
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prefix = setup_git_directory();
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trace_repo_setup(prefix);
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setup_work_tree();
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git_config(git_default_config, NULL);
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git_config(rebase_config, &options);
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if (is_directory(apply_dir())) {
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options.type = REBASE_AM;
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options.state_dir = apply_dir();
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} else if (is_directory(merge_dir())) {
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strbuf_reset(&buf);
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strbuf_addf(&buf, "%s/rewritten", merge_dir());
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if (is_directory(buf.buf)) {
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options.type = REBASE_PRESERVE_MERGES;
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options.flags |= REBASE_INTERACTIVE_EXPLICIT;
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} else {
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strbuf_reset(&buf);
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strbuf_addf(&buf, "%s/interactive", merge_dir());
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if(file_exists(buf.buf)) {
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options.type = REBASE_INTERACTIVE;
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options.flags |= REBASE_INTERACTIVE_EXPLICIT;
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} else
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options.type = REBASE_MERGE;
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}
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options.state_dir = merge_dir();
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}
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if (options.type != REBASE_UNSPECIFIED)
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in_progress = 1;
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argc = parse_options(argc, argv, prefix,
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builtin_rebase_options,
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builtin_rebase_usage, 0);
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if (argc > 2)
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usage_with_options(builtin_rebase_usage,
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builtin_rebase_options);
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/* Make sure no rebase is in progress */
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if (in_progress) {
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const char *last_slash = strrchr(options.state_dir, '/');
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const char *state_dir_base =
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last_slash ? last_slash + 1 : options.state_dir;
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const char *cmd_live_rebase =
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"git rebase (--continue | --abort | --skip)";
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strbuf_reset(&buf);
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strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
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die(_("It seems that there is already a %s directory, and\n"
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"I wonder if you are in the middle of another rebase. "
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"If that is the\n"
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"case, please try\n\t%s\n"
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"If that is not the case, please\n\t%s\n"
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"and run me again. I am stopping in case you still "
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"have something\n"
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"valuable there.\n"),
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state_dir_base, cmd_live_rebase, buf.buf);
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}
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if (!(options.flags & REBASE_NO_QUIET))
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strbuf_addstr(&options.git_am_opt, " -q");
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||||
switch (options.type) {
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case REBASE_MERGE:
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@ -343,10 +529,10 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
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}
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||||
|
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if (!options.root) {
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if (argc < 2)
|
||||
if (argc < 1)
|
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die("TODO: handle @{upstream}");
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else {
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||||
options.upstream_name = argv[1];
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||||
options.upstream_name = argv[0];
|
||||
argc--;
|
||||
argv++;
|
||||
if (!strcmp(options.upstream_name, "-"))
|
||||
@ -355,6 +541,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
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||||
options.upstream = peel_committish(options.upstream_name);
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||||
if (!options.upstream)
|
||||
die(_("invalid upstream '%s'"), options.upstream_name);
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||||
options.upstream_arg = options.upstream_name;
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||||
} else
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||||
die("TODO: upstream for --root");
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||||
|
||||
@ -362,7 +549,11 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
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||||
if (!options.onto_name)
|
||||
options.onto_name = options.upstream_name;
|
||||
if (strstr(options.onto_name, "...")) {
|
||||
die("TODO");
|
||||
if (get_oid_mb(options.onto_name, &merge_base) < 0)
|
||||
die(_("'%s': need exactly one merge base"),
|
||||
options.onto_name);
|
||||
options.onto = lookup_commit_or_die(&merge_base,
|
||||
options.onto_name);
|
||||
} else {
|
||||
options.onto = peel_committish(options.onto_name);
|
||||
if (!options.onto)
|
||||
@ -375,11 +566,25 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
|
||||
* branch_name -- branch/commit being rebased, or
|
||||
* HEAD (already detached)
|
||||
* orig_head -- commit object name of tip of the branch before rebasing
|
||||
* head_name -- refs/heads/<that-branch> or "detached HEAD"
|
||||
* head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
|
||||
*/
|
||||
if (argc > 1)
|
||||
die("TODO: handle switch_to");
|
||||
else {
|
||||
if (argc == 1) {
|
||||
/* Is it "rebase other branchname" or "rebase other commit"? */
|
||||
branch_name = argv[0];
|
||||
options.switch_to = argv[0];
|
||||
|
||||
/* Is it a local branch? */
|
||||
strbuf_reset(&buf);
|
||||
strbuf_addf(&buf, "refs/heads/%s", branch_name);
|
||||
if (!read_ref(buf.buf, &options.orig_head))
|
||||
options.head_name = xstrdup(buf.buf);
|
||||
/* If not is it a valid ref (branch or commit)? */
|
||||
else if (!get_oid(branch_name, &options.orig_head))
|
||||
options.head_name = NULL;
|
||||
else
|
||||
die(_("fatal: no such branch/commit '%s'"),
|
||||
branch_name);
|
||||
} else if (argc == 0) {
|
||||
/* Do not need to switch branches, we are already on it. */
|
||||
options.head_name =
|
||||
xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
|
||||
@ -392,13 +597,115 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
|
||||
branch_name = options.head_name;
|
||||
|
||||
} else {
|
||||
options.head_name = xstrdup("detached HEAD");
|
||||
free(options.head_name);
|
||||
options.head_name = NULL;
|
||||
branch_name = "HEAD";
|
||||
}
|
||||
if (get_oid("HEAD", &options.orig_head))
|
||||
die(_("Could not resolve HEAD to a revision"));
|
||||
} else
|
||||
BUG("unexpected number of arguments left to parse");
|
||||
|
||||
if (read_index(the_repository->index) < 0)
|
||||
die(_("could not read index"));
|
||||
|
||||
if (require_clean_work_tree("rebase",
|
||||
_("Please commit or stash them."), 1, 1)) {
|
||||
ret = 1;
|
||||
goto cleanup;
|
||||
}
|
||||
|
||||
/*
|
||||
* Now we are rebasing commits upstream..orig_head (or with --root,
|
||||
* everything leading up to orig_head) on top of onto.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Check if we are already based on onto with linear history,
|
||||
* but this should be done only when upstream and onto are the same
|
||||
* and if this is not an interactive rebase.
|
||||
*/
|
||||
if (can_fast_forward(options.onto, &options.orig_head, &merge_base) &&
|
||||
!is_interactive(&options) && !options.restrict_revision &&
|
||||
!oidcmp(&options.upstream->object.oid, &options.onto->object.oid)) {
|
||||
int flag;
|
||||
|
||||
if (!(options.flags & REBASE_FORCE)) {
|
||||
/* Lazily switch to the target branch if needed... */
|
||||
if (options.switch_to) {
|
||||
struct object_id oid;
|
||||
|
||||
if (get_oid(options.switch_to, &oid) < 0) {
|
||||
ret = !!error(_("could not parse '%s'"),
|
||||
options.switch_to);
|
||||
goto cleanup;
|
||||
}
|
||||
|
||||
strbuf_reset(&buf);
|
||||
strbuf_addf(&buf, "rebase: checkout %s",
|
||||
options.switch_to);
|
||||
if (reset_head(&oid, "checkout",
|
||||
options.head_name, 0) < 0) {
|
||||
ret = !!error(_("could not switch to "
|
||||
"%s"),
|
||||
options.switch_to);
|
||||
goto cleanup;
|
||||
}
|
||||
}
|
||||
|
||||
if (!(options.flags & REBASE_NO_QUIET))
|
||||
; /* be quiet */
|
||||
else if (!strcmp(branch_name, "HEAD") &&
|
||||
resolve_ref_unsafe("HEAD", 0, NULL, &flag))
|
||||
puts(_("HEAD is up to date."));
|
||||
else
|
||||
printf(_("Current branch %s is up to date.\n"),
|
||||
branch_name);
|
||||
ret = !!finish_rebase(&options);
|
||||
goto cleanup;
|
||||
} else if (!(options.flags & REBASE_NO_QUIET))
|
||||
; /* be quiet */
|
||||
else if (!strcmp(branch_name, "HEAD") &&
|
||||
resolve_ref_unsafe("HEAD", 0, NULL, &flag))
|
||||
puts(_("HEAD is up to date, rebase forced."));
|
||||
else
|
||||
printf(_("Current branch %s is up to date, rebase "
|
||||
"forced.\n"), branch_name);
|
||||
}
|
||||
|
||||
/* If a hook exists, give it a chance to interrupt*/
|
||||
if (!ok_to_skip_pre_rebase &&
|
||||
run_hook_le(NULL, "pre-rebase", options.upstream_arg,
|
||||
argc ? argv[0] : NULL, NULL))
|
||||
die(_("The pre-rebase hook refused to rebase."));
|
||||
|
||||
if (options.flags & REBASE_DIFFSTAT) {
|
||||
struct diff_options opts;
|
||||
|
||||
if (options.flags & REBASE_VERBOSE)
|
||||
printf(_("Changes from %s to %s:\n"),
|
||||
oid_to_hex(&merge_base),
|
||||
oid_to_hex(&options.onto->object.oid));
|
||||
|
||||
/* We want color (if set), but no pager */
|
||||
diff_setup(&opts);
|
||||
opts.stat_width = -1; /* use full terminal width */
|
||||
opts.stat_graph_width = -1; /* respect statGraphWidth config */
|
||||
opts.output_format |=
|
||||
DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
|
||||
opts.detect_rename = DIFF_DETECT_RENAME;
|
||||
diff_setup_done(&opts);
|
||||
diff_tree_oid(&merge_base, &options.onto->object.oid,
|
||||
"", &opts);
|
||||
diffcore_std(&opts);
|
||||
diff_flush(&opts);
|
||||
}
|
||||
|
||||
/* Detach HEAD and reset the tree */
|
||||
if (options.flags & REBASE_NO_QUIET)
|
||||
printf(_("First, rewinding head to replay your work on top of "
|
||||
"it...\n"));
|
||||
|
||||
strbuf_addf(&msg, "rebase: checkout %s", options.onto_name);
|
||||
if (reset_head(&options.onto->object.oid, "checkout", NULL, 1))
|
||||
die(_("Could not detach HEAD"));
|
||||
@ -415,6 +722,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
|
||||
|
||||
ret = !!run_specific_rebase(&options);
|
||||
|
||||
cleanup:
|
||||
strbuf_release(&revisions);
|
||||
free(options.head_name);
|
||||
return ret;
|
||||
|
Loading…
Reference in New Issue
Block a user