From c8bae7493d2f2910b57f13ded012e86bdcfb0532 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 16:47:53 +0200 Subject: Adding upstream version 1:2.39.2. Signed-off-by: Daniel Baumann --- reset.c | 175 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 175 insertions(+) create mode 100644 reset.c (limited to 'reset.c') diff --git a/reset.c b/reset.c new file mode 100644 index 0000000..5ded236 --- /dev/null +++ b/reset.c @@ -0,0 +1,175 @@ +#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 */ + unpack_tree_opts.skip_cache_tree_update = 1; + 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; + +} -- cgit v1.2.3