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#include "git-compat-util.h"
#include "cache-tree.h"
#include "lockfile.h"
#include "refs.h"
#include "reset.h"
#include "run-command.h"
#include "tree-walk.h"
#include "tree.h"
#include "unpack-trees.h"
#include "hook.h"
static int update_refs(const struct reset_head_opts *opts,
const struct object_id *oid,
const struct object_id *head)
{
unsigned detach_head = opts->flags & RESET_HEAD_DETACH;
unsigned run_hook = opts->flags & RESET_HEAD_RUN_POST_CHECKOUT_HOOK;
unsigned update_orig_head = opts->flags & RESET_ORIG_HEAD;
const struct object_id *orig_head = opts->orig_head;
const char *switch_to_branch = opts->branch;
const char *reflog_branch = opts->branch_msg;
const char *reflog_head = opts->head_msg;
const char *reflog_orig_head = opts->orig_head_msg;
const char *default_reflog_action = opts->default_reflog_action;
struct object_id *old_orig = NULL, oid_old_orig;
struct strbuf msg = STRBUF_INIT;
const char *reflog_action;
size_t prefix_len;
int ret;
if ((update_orig_head && !reflog_orig_head) || !reflog_head) {
if (!default_reflog_action)
BUG("default_reflog_action must be given when reflog messages are omitted");
reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action :
default_reflog_action);
}
prefix_len = msg.len;
if (update_orig_head) {
if (!get_oid("ORIG_HEAD", &oid_old_orig))
old_orig = &oid_old_orig;
if (head) {
if (!reflog_orig_head) {
strbuf_addstr(&msg, "updating ORIG_HEAD");
reflog_orig_head = msg.buf;
}
update_ref(reflog_orig_head, "ORIG_HEAD",
orig_head ? orig_head : head,
old_orig, 0, UPDATE_REFS_MSG_ON_ERR);
} else if (old_orig)
delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
}
if (!reflog_head) {
strbuf_setlen(&msg, prefix_len);
strbuf_addstr(&msg, "updating HEAD");
reflog_head = msg.buf;
}
if (!switch_to_branch)
ret = update_ref(reflog_head, "HEAD", oid, head,
detach_head ? REF_NO_DEREF : 0,
UPDATE_REFS_MSG_ON_ERR);
else {
ret = update_ref(reflog_branch ? reflog_branch : reflog_head,
switch_to_branch, oid, NULL, 0,
UPDATE_REFS_MSG_ON_ERR);
if (!ret)
ret = create_symref("HEAD", switch_to_branch,
reflog_head);
}
if (!ret && run_hook)
run_hooks_l("post-checkout",
oid_to_hex(head ? head : null_oid()),
oid_to_hex(oid), "1", NULL);
strbuf_release(&msg);
return ret;
}
int reset_head(struct repository *r, const struct reset_head_opts *opts)
{
const struct object_id *oid = opts->oid;
const char *switch_to_branch = opts->branch;
unsigned reset_hard = opts->flags & RESET_HEAD_HARD;
unsigned refs_only = opts->flags & RESET_HEAD_REFS_ONLY;
unsigned update_orig_head = opts->flags & RESET_ORIG_HEAD;
struct object_id *head = NULL, head_oid;
struct tree_desc desc[2] = { { NULL }, { NULL } };
struct lock_file lock = LOCK_INIT;
struct unpack_trees_options unpack_tree_opts = { 0 };
struct tree *tree;
const char *action;
int ret = 0, nr = 0;
if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
BUG("Not a fully qualified branch: '%s'", switch_to_branch);
if (opts->orig_head_msg && !update_orig_head)
BUG("ORIG_HEAD reflog message given without updating ORIG_HEAD");
if (opts->branch_msg && !opts->branch)
BUG("branch reflog message given without a branch");
if (!refs_only && repo_hold_locked_index(r, &lock, LOCK_REPORT_ON_ERROR) < 0) {
ret = -1;
goto leave_reset_head;
}
if (!get_oid("HEAD", &head_oid)) {
head = &head_oid;
} else if (!oid || !reset_hard) {
ret = error(_("could not determine HEAD revision"));
goto leave_reset_head;
}
if (!oid)
oid = &head_oid;
if (refs_only)
return update_refs(opts, oid, head);
action = reset_hard ? "reset" : "checkout";
setup_unpack_trees_porcelain(&unpack_tree_opts, action);
unpack_tree_opts.head_idx = 1;
unpack_tree_opts.src_index = r->index;
unpack_tree_opts.dst_index = r->index;
unpack_tree_opts.fn = reset_hard ? oneway_merge : twoway_merge;
unpack_tree_opts.update = 1;
unpack_tree_opts.merge = 1;
unpack_tree_opts.preserve_ignored = 0; /* FIXME: !overwrite_ignore */
init_checkout_metadata(&unpack_tree_opts.meta, switch_to_branch, oid, NULL);
if (reset_hard)
unpack_tree_opts.reset = UNPACK_RESET_PROTECT_UNTRACKED;
if (repo_read_index_unmerged(r) < 0) {
ret = error(_("could not read index"));
goto leave_reset_head;
}
if (!reset_hard && !fill_tree_descriptor(r, &desc[nr++], &head_oid)) {
ret = error(_("failed to find tree of %s"),
oid_to_hex(&head_oid));
goto leave_reset_head;
}
if (!fill_tree_descriptor(r, &desc[nr++], oid)) {
ret = error(_("failed to find tree of %s"), oid_to_hex(oid));
goto leave_reset_head;
}
if (unpack_trees(nr, desc, &unpack_tree_opts)) {
ret = -1;
goto leave_reset_head;
}
tree = parse_tree_indirect(oid);
prime_cache_tree(r, r->index, tree);
if (write_locked_index(r->index, &lock, COMMIT_LOCK) < 0) {
ret = error(_("could not write index"));
goto leave_reset_head;
}
if (oid != &head_oid || update_orig_head || switch_to_branch)
ret = update_refs(opts, oid, head);
leave_reset_head:
rollback_lock_file(&lock);
clear_unpack_trees_porcelain(&unpack_tree_opts);
while (nr)
free((void *)desc[--nr].buffer);
return ret;
}
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