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-rw-r--r--builtin-checkout.c246
1 files changed, 208 insertions, 38 deletions
diff --git a/builtin-checkout.c b/builtin-checkout.c
index c107fd6..b5dd9c0 100644
--- a/builtin-checkout.c
+++ b/builtin-checkout.c
@@ -13,6 +13,9 @@
#include "diff.h"
#include "revision.h"
#include "remote.h"
+#include "blob.h"
+#include "xdiff-interface.h"
+#include "ll-merge.h"
static const char * const checkout_usage[] = {
"git checkout [options] <branch>",
@@ -20,6 +23,18 @@ static const char * const checkout_usage[] = {
NULL,
};
+struct checkout_opts {
+ int quiet;
+ int merge;
+ int force;
+ int writeout_stage;
+ int writeout_error;
+
+ const char *new_branch;
+ int new_branch_log;
+ enum branch_track track;
+};
+
static int post_checkout_hook(struct commit *old, struct commit *new,
int changed)
{
@@ -84,8 +99,121 @@ static int skip_same_name(struct cache_entry *ce, int pos)
return pos;
}
+static int check_stage(int stage, struct cache_entry *ce, int pos)
+{
+ while (pos < active_nr &&
+ !strcmp(active_cache[pos]->name, ce->name)) {
+ if (ce_stage(active_cache[pos]) == stage)
+ return 0;
+ pos++;
+ }
+ return error("path '%s' does not have %s version",
+ ce->name,
+ (stage == 2) ? "our" : "their");
+}
-static int checkout_paths(struct tree *source_tree, const char **pathspec)
+static int check_all_stages(struct cache_entry *ce, int pos)
+{
+ if (ce_stage(ce) != 1 ||
+ active_nr <= pos + 2 ||
+ strcmp(active_cache[pos+1]->name, ce->name) ||
+ ce_stage(active_cache[pos+1]) != 2 ||
+ strcmp(active_cache[pos+2]->name, ce->name) ||
+ ce_stage(active_cache[pos+2]) != 3)
+ return error("path '%s' does not have all three versions",
+ ce->name);
+ return 0;
+}
+
+static int checkout_stage(int stage, struct cache_entry *ce, int pos,
+ struct checkout *state)
+{
+ while (pos < active_nr &&
+ !strcmp(active_cache[pos]->name, ce->name)) {
+ if (ce_stage(active_cache[pos]) == stage)
+ return checkout_entry(active_cache[pos], state, NULL);
+ pos++;
+ }
+ return error("path '%s' does not have %s version",
+ ce->name,
+ (stage == 2) ? "our" : "their");
+}
+
+/* NEEDSWORK: share with merge-recursive */
+static void fill_mm(const unsigned char *sha1, mmfile_t *mm)
+{
+ unsigned long size;
+ enum object_type type;
+
+ if (!hashcmp(sha1, null_sha1)) {
+ mm->ptr = xstrdup("");
+ mm->size = 0;
+ return;
+ }
+
+ mm->ptr = read_sha1_file(sha1, &type, &size);
+ if (!mm->ptr || type != OBJ_BLOB)
+ die("unable to read blob object %s", sha1_to_hex(sha1));
+ mm->size = size;
+}
+
+static int checkout_merged(int pos, struct checkout *state)
+{
+ struct cache_entry *ce = active_cache[pos];
+ const char *path = ce->name;
+ mmfile_t ancestor, ours, theirs;
+ int status;
+ unsigned char sha1[20];
+ mmbuffer_t result_buf;
+
+ if (ce_stage(ce) != 1 ||
+ active_nr <= pos + 2 ||
+ strcmp(active_cache[pos+1]->name, path) ||
+ ce_stage(active_cache[pos+1]) != 2 ||
+ strcmp(active_cache[pos+2]->name, path) ||
+ ce_stage(active_cache[pos+2]) != 3)
+ return error("path '%s' does not have all 3 versions", path);
+
+ fill_mm(active_cache[pos]->sha1, &ancestor);
+ fill_mm(active_cache[pos+1]->sha1, &ours);
+ fill_mm(active_cache[pos+2]->sha1, &theirs);
+
+ status = ll_merge(&result_buf, path, &ancestor,
+ &ours, "ours", &theirs, "theirs", 1);
+ free(ancestor.ptr);
+ free(ours.ptr);
+ free(theirs.ptr);
+ if (status < 0 || !result_buf.ptr) {
+ free(result_buf.ptr);
+ return error("path '%s': cannot merge", path);
+ }
+
+ /*
+ * NEEDSWORK:
+ * There is absolutely no reason to write this as a blob object
+ * and create a phoney cache entry just to leak. This hack is
+ * primarily to get to the write_entry() machinery that massages
+ * the contents to work-tree format and writes out which only
+ * allows it for a cache entry. The code in write_entry() needs
+ * to be refactored to allow us to feed a <buffer, size, mode>
+ * instead of a cache entry. Such a refactoring would help
+ * merge_recursive as well (it also writes the merge result to the
+ * object database even when it may contain conflicts).
+ */
+ if (write_sha1_file(result_buf.ptr, result_buf.size,
+ blob_type, sha1))
+ die("Unable to add merge result for '%s'", path);
+ ce = make_cache_entry(create_ce_mode(active_cache[pos+1]->ce_mode),
+ sha1,
+ path, 2, 0);
+ if (!ce)
+ die("make_cache_entry failed for path '%s'", path);
+ status = checkout_entry(ce, state, NULL);
+ return status;
+}
+
+static int checkout_paths(struct tree *source_tree, const char **pathspec,
+ struct checkout_opts *opts)
{
int pos;
struct checkout state;
@@ -94,12 +222,14 @@ static int checkout_paths(struct tree *source_tree, const char **pathspec)
int flag;
struct commit *head;
int errs = 0;
-
+ int stage = opts->writeout_stage;
+ int merge = opts->merge;
int newfd;
struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
newfd = hold_locked_index(lock_file, 1);
- read_cache();
+ if (read_cache() < 0)
+ return error("corrupt index file");
if (source_tree)
read_tree_some(source_tree, pathspec);
@@ -122,8 +252,16 @@ static int checkout_paths(struct tree *source_tree, const char **pathspec)
if (pathspec_match(pathspec, NULL, ce->name, 0)) {
if (!ce_stage(ce))
continue;
- errs = 1;
- error("path '%s' is unmerged", ce->name);
+ if (opts->force) {
+ warning("path '%s' is unmerged", ce->name);
+ } else if (stage) {
+ errs |= check_stage(stage, ce, pos);
+ } else if (opts->merge) {
+ errs |= check_all_stages(ce, pos);
+ } else {
+ errs = 1;
+ error("path '%s' is unmerged", ce->name);
+ }
pos = skip_same_name(ce, pos) - 1;
}
}
@@ -141,6 +279,10 @@ static int checkout_paths(struct tree *source_tree, const char **pathspec)
errs |= checkout_entry(ce, &state, NULL);
continue;
}
+ if (stage)
+ errs |= checkout_stage(stage, ce, pos, &state);
+ else if (merge)
+ errs |= checkout_merged(pos, &state);
pos = skip_same_name(ce, pos) - 1;
}
}
@@ -169,8 +311,7 @@ static void show_local_changes(struct object *head)
static void describe_detached_head(char *msg, struct commit *commit)
{
- struct strbuf sb;
- strbuf_init(&sb, 0);
+ struct strbuf sb = STRBUF_INIT;
parse_commit(commit);
pretty_print_commit(CMIT_FMT_ONELINE, commit, &sb, 0, NULL, NULL, 0, 0);
fprintf(stderr, "%s %s... %s\n", msg,
@@ -178,17 +319,6 @@ static void describe_detached_head(char *msg, struct commit *commit)
strbuf_release(&sb);
}
-struct checkout_opts {
- int quiet;
- int merge;
- int force;
- int writeout_error;
-
- char *new_branch;
- int new_branch_log;
- enum branch_track track;
-};
-
static int reset_tree(struct tree *tree, struct checkout_opts *o, int worktree)
{
struct unpack_trees_options opts;
@@ -230,8 +360,7 @@ struct branch_info {
static void setup_branch_path(struct branch_info *branch)
{
- struct strbuf buf;
- strbuf_init(&buf, 0);
+ struct strbuf buf = STRBUF_INIT;
strbuf_addstr(&buf, "refs/heads/");
strbuf_addstr(&buf, branch->name);
branch->path = strbuf_detach(&buf, NULL);
@@ -243,7 +372,9 @@ static int merge_working_tree(struct checkout_opts *opts,
int ret;
struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
int newfd = hold_locked_index(lock_file, 1);
- read_cache();
+
+ if (read_cache() < 0)
+ return error("corrupt index file");
if (opts->force) {
ret = reset_tree(new->commit->tree, opts, 1);
@@ -292,6 +423,7 @@ static int merge_working_tree(struct checkout_opts *opts,
*/
struct tree *result;
struct tree *work;
+ struct merge_options o;
if (!opts->merge)
return 1;
parse_commit(old->commit);
@@ -310,13 +442,17 @@ static int merge_working_tree(struct checkout_opts *opts,
*/
add_files_to_cache(NULL, NULL, 0);
- work = write_tree_from_memory();
+ init_merge_options(&o);
+ o.verbosity = 0;
+ work = write_tree_from_memory(&o);
ret = reset_tree(new->commit->tree, opts, 1);
if (ret)
return ret;
- merge_trees(new->commit->tree, work, old->commit->tree,
- new->name, "local", &result);
+ o.branch1 = new->name;
+ o.branch2 = "local";
+ merge_trees(&o, new->commit->tree, work,
+ old->commit->tree, &result);
ret = reset_tree(new->commit->tree, opts, 0);
if (ret)
return ret;
@@ -348,7 +484,7 @@ static void update_refs_for_switch(struct checkout_opts *opts,
struct branch_info *old,
struct branch_info *new)
{
- struct strbuf msg;
+ struct strbuf msg = STRBUF_INIT;
const char *old_desc;
if (opts->new_branch) {
create_branch(old->name, opts->new_branch, new->name, 0,
@@ -357,7 +493,6 @@ static void update_refs_for_switch(struct checkout_opts *opts,
setup_branch_path(new);
}
- strbuf_init(&msg, 0);
old_desc = old->name;
if (!old_desc && old->commit)
old_desc = sha1_to_hex(old->commit->object.sha1);
@@ -439,6 +574,11 @@ static int switch_branches(struct checkout_opts *opts, struct branch_info *new)
return ret || opts->writeout_error;
}
+static int git_checkout_config(const char *var, const char *value, void *cb)
+{
+ return git_xmerge_config(var, value, cb);
+}
+
int cmd_checkout(int argc, const char **argv, const char *prefix)
{
struct checkout_opts opts;
@@ -446,14 +586,21 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
const char *arg;
struct branch_info new;
struct tree *source_tree = NULL;
+ char *conflict_style = NULL;
struct option options[] = {
OPT__QUIET(&opts.quiet),
OPT_STRING('b', NULL, &opts.new_branch, "new branch", "branch"),
OPT_BOOLEAN('l', NULL, &opts.new_branch_log, "log for new branch"),
OPT_SET_INT('t', "track", &opts.track, "track",
BRANCH_TRACK_EXPLICIT),
+ OPT_SET_INT('2', "ours", &opts.writeout_stage, "stage",
+ 2),
+ OPT_SET_INT('3', "theirs", &opts.writeout_stage, "stage",
+ 3),
OPT_BOOLEAN('f', NULL, &opts.force, "force"),
- OPT_BOOLEAN('m', NULL, &opts.merge, "merge"),
+ OPT_BOOLEAN('m', "merge", &opts.merge, "merge"),
+ OPT_STRING(0, "conflict", &conflict_style, "style",
+ "conflict style (merge or diff3)"),
OPT_END(),
};
int has_dash_dash;
@@ -461,15 +608,34 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
memset(&opts, 0, sizeof(opts));
memset(&new, 0, sizeof(new));
- git_config(git_default_config, NULL);
+ git_config(git_checkout_config, NULL);
- opts.track = git_branch_track;
+ opts.track = BRANCH_TRACK_UNSPECIFIED;
argc = parse_options(argc, argv, options, checkout_usage,
PARSE_OPT_KEEP_DASHDASH);
- if (!opts.new_branch && (opts.track != git_branch_track))
- die("git checkout: --track and --no-track require -b");
+ /* --track without -b should DWIM */
+ if (0 < opts.track && !opts.new_branch) {
+ const char *argv0 = argv[0];
+ if (!argc || !strcmp(argv0, "--"))
+ die ("--track needs a branch name");
+ if (!prefixcmp(argv0, "refs/"))
+ argv0 += 5;
+ if (!prefixcmp(argv0, "remotes/"))
+ argv0 += 8;
+ argv0 = strchr(argv0, '/');
+ if (!argv0 || !argv0[1])
+ die ("Missing branch name; try -b");
+ opts.new_branch = argv0 + 1;
+ }
+
+ if (opts.track == BRANCH_TRACK_UNSPECIFIED)
+ opts.track = git_branch_track;
+ if (conflict_style) {
+ opts.merge = 1; /* implied */
+ git_xmerge_config("merge.conflictstyle", conflict_style, NULL);
+ }
if (opts.force && opts.merge)
die("git checkout: -f and -m are incompatible");
@@ -515,8 +681,8 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
argv++;
argc--;
+ new.name = arg;
if ((new.commit = lookup_commit_reference_gently(rev, 1))) {
- new.name = arg;
setup_branch_path(&new);
if (resolve_ref(new.path, rev, 1, NULL))
new.commit = lookup_commit_reference(rev);
@@ -553,20 +719,22 @@ no_reference:
die("invalid path specification");
/* Checkout paths */
- if (opts.new_branch || opts.force || opts.merge) {
+ if (opts.new_branch) {
if (argc == 1) {
- die("git checkout: updating paths is incompatible with switching branches/forcing\nDid you intend to checkout '%s' which can not be resolved as commit?", argv[0]);
+ die("git checkout: updating paths is incompatible with switching branches.\nDid you intend to checkout '%s' which can not be resolved as commit?", argv[0]);
} else {
- die("git checkout: updating paths is incompatible with switching branches/forcing");
+ die("git checkout: updating paths is incompatible with switching branches.");
}
}
- return checkout_paths(source_tree, pathspec);
+ if (1 < !!opts.writeout_stage + !!opts.force + !!opts.merge)
+ die("git checkout: --ours/--theirs, --force and --merge are incompatible when\nchecking out of the index.");
+
+ return checkout_paths(source_tree, pathspec, &opts);
}
if (opts.new_branch) {
- struct strbuf buf;
- strbuf_init(&buf, 0);
+ struct strbuf buf = STRBUF_INIT;
strbuf_addstr(&buf, "refs/heads/");
strbuf_addstr(&buf, opts.new_branch);
if (!get_sha1(buf.buf, rev))
@@ -579,6 +747,8 @@ no_reference:
if (new.name && !new.commit) {
die("Cannot switch branch to a non-commit.");
}
+ if (opts.writeout_stage)
+ die("--ours/--theirs is incompatible with switching branches.");
return switch_branches(&opts, &new);
}