| 1 | #define USE_THE_REPOSITORY_VARIABLE |
| 2 | |
| 3 | #include "git-compat-util.h" |
| 4 | #include "cache-tree.h" |
| 5 | #include "gettext.h" |
| 6 | #include "hex.h" |
| 7 | #include "lockfile.h" |
| 8 | #include "object-name.h" |
| 9 | #include "refs.h" |
| 10 | #include "reset.h" |
| 11 | #include "tree-walk.h" |
| 12 | #include "tree.h" |
| 13 | #include "unpack-trees.h" |
| 14 | #include "hook.h" |
| 15 | |
| 16 | static int update_refs(const struct reset_head_opts *opts, |
| 17 | const struct object_id *oid, |
| 18 | const struct object_id *head) |
| 19 | { |
| 20 | unsigned detach_head = opts->flags & RESET_HEAD_DETACH; |
| 21 | unsigned run_hook = opts->flags & RESET_HEAD_RUN_POST_CHECKOUT_HOOK; |
| 22 | unsigned update_orig_head = opts->flags & RESET_ORIG_HEAD; |
| 23 | const struct object_id *orig_head = opts->orig_head; |
| 24 | const char *switch_to_branch = opts->branch; |
| 25 | const char *reflog_branch = opts->branch_msg; |
| 26 | const char *reflog_head = opts->head_msg; |
| 27 | const char *reflog_orig_head = opts->orig_head_msg; |
| 28 | const char *default_reflog_action = opts->default_reflog_action; |
| 29 | struct object_id *old_orig = NULL, oid_old_orig; |
| 30 | struct strbuf msg = STRBUF_INIT; |
| 31 | const char *reflog_action; |
| 32 | size_t prefix_len; |
| 33 | int ret; |
| 34 | |
| 35 | if ((update_orig_head && !reflog_orig_head) || !reflog_head) { |
| 36 | if (!default_reflog_action) |
| 37 | BUG("default_reflog_action must be given when reflog messages are omitted"); |
| 38 | reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT); |
| 39 | strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : |
| 40 | default_reflog_action); |
| 41 | } |
| 42 | prefix_len = msg.len; |
| 43 | |
| 44 | if (update_orig_head) { |
| 45 | if (!repo_get_oid(the_repository, "ORIG_HEAD", &oid_old_orig)) |
| 46 | old_orig = &oid_old_orig; |
| 47 | if (head) { |
| 48 | if (!reflog_orig_head) { |
| 49 | strbuf_addstr(&msg, "updating ORIG_HEAD"); |
| 50 | reflog_orig_head = msg.buf; |
| 51 | } |
| 52 | refs_update_ref(get_main_ref_store(the_repository), |
| 53 | reflog_orig_head, "ORIG_HEAD", |
| 54 | orig_head ? orig_head : head, |
| 55 | old_orig, 0, UPDATE_REFS_MSG_ON_ERR); |
| 56 | } else if (old_orig) |
| 57 | refs_delete_ref(get_main_ref_store(the_repository), |
| 58 | NULL, "ORIG_HEAD", old_orig, 0); |
| 59 | } |
| 60 | |
| 61 | if (!reflog_head) { |
| 62 | strbuf_setlen(&msg, prefix_len); |
| 63 | strbuf_addstr(&msg, "updating HEAD"); |
| 64 | reflog_head = msg.buf; |
| 65 | } |
| 66 | if (!switch_to_branch) |
| 67 | ret = refs_update_ref(get_main_ref_store(the_repository), |
| 68 | reflog_head, "HEAD", oid, head, |
| 69 | detach_head ? REF_NO_DEREF : 0, |
| 70 | UPDATE_REFS_MSG_ON_ERR); |
| 71 | else { |
| 72 | ret = refs_update_ref(get_main_ref_store(the_repository), |
| 73 | reflog_branch ? reflog_branch : reflog_head, |
| 74 | switch_to_branch, oid, NULL, 0, |
| 75 | UPDATE_REFS_MSG_ON_ERR); |
| 76 | if (!ret) |
| 77 | ret = refs_update_symref(get_main_ref_store(the_repository), |
| 78 | "HEAD", switch_to_branch, |
| 79 | reflog_head); |
| 80 | } |
| 81 | if (!ret && run_hook) |
| 82 | run_hooks_l(the_repository, "post-checkout", |
| 83 | oid_to_hex(head ? head : null_oid(the_hash_algo)), |
| 84 | oid_to_hex(oid), "1", NULL); |
| 85 | strbuf_release(&msg); |
| 86 | return ret; |
| 87 | } |
| 88 | |
| 89 | int reset_head(struct repository *r, const struct reset_head_opts *opts) |
| 90 | { |
| 91 | const struct object_id *oid = opts->oid; |
| 92 | const char *switch_to_branch = opts->branch; |
| 93 | unsigned reset_hard = opts->flags & RESET_HEAD_HARD; |
| 94 | unsigned refs_only = opts->flags & RESET_HEAD_REFS_ONLY; |
| 95 | unsigned update_orig_head = opts->flags & RESET_ORIG_HEAD; |
| 96 | struct object_id *head = NULL, head_oid; |
| 97 | struct tree_desc desc[2] = { { NULL }, { NULL } }; |
| 98 | struct lock_file lock = LOCK_INIT; |
| 99 | struct unpack_trees_options unpack_tree_opts = { 0 }; |
| 100 | struct tree *tree; |
| 101 | const char *action; |
| 102 | int ret = 0, nr = 0; |
| 103 | |
| 104 | if (switch_to_branch && !starts_with(switch_to_branch, "refs/")) |
| 105 | BUG("Not a fully qualified branch: '%s'", switch_to_branch); |
| 106 | |
| 107 | if (opts->orig_head_msg && !update_orig_head) |
| 108 | BUG("ORIG_HEAD reflog message given without updating ORIG_HEAD"); |
| 109 | |
| 110 | if (opts->branch_msg && !opts->branch) |
| 111 | BUG("branch reflog message given without a branch"); |
| 112 | |
| 113 | if (!refs_only && repo_hold_locked_index(r, &lock, LOCK_REPORT_ON_ERROR) < 0) { |
| 114 | ret = -1; |
| 115 | goto leave_reset_head; |
| 116 | } |
| 117 | |
| 118 | if (!repo_get_oid(r, "HEAD", &head_oid)) { |
| 119 | head = &head_oid; |
| 120 | } else if (!oid || !reset_hard) { |
| 121 | ret = error(_("could not determine HEAD revision")); |
| 122 | goto leave_reset_head; |
| 123 | } |
| 124 | |
| 125 | if (!oid) |
| 126 | oid = &head_oid; |
| 127 | |
| 128 | if (refs_only) |
| 129 | return update_refs(opts, oid, head); |
| 130 | |
| 131 | action = reset_hard ? "reset" : "checkout"; |
| 132 | setup_unpack_trees_porcelain(&unpack_tree_opts, action); |
| 133 | unpack_tree_opts.head_idx = 1; |
| 134 | unpack_tree_opts.src_index = r->index; |
| 135 | unpack_tree_opts.dst_index = r->index; |
| 136 | unpack_tree_opts.fn = reset_hard ? oneway_merge : twoway_merge; |
| 137 | unpack_tree_opts.update = 1; |
| 138 | unpack_tree_opts.merge = 1; |
| 139 | unpack_tree_opts.preserve_ignored = 0; /* FIXME: !overwrite_ignore */ |
| 140 | unpack_tree_opts.skip_cache_tree_update = 1; |
| 141 | init_checkout_metadata(&unpack_tree_opts.meta, switch_to_branch, oid, NULL); |
| 142 | if (reset_hard) |
| 143 | unpack_tree_opts.reset = UNPACK_RESET_PROTECT_UNTRACKED; |
| 144 | |
| 145 | if (repo_read_index_unmerged(r) < 0) { |
| 146 | ret = error(_("could not read index")); |
| 147 | goto leave_reset_head; |
| 148 | } |
| 149 | |
| 150 | if (!reset_hard && !fill_tree_descriptor(r, &desc[nr++], &head_oid)) { |
| 151 | ret = error(_("failed to find tree of %s"), |
| 152 | oid_to_hex(&head_oid)); |
| 153 | goto leave_reset_head; |
| 154 | } |
| 155 | |
| 156 | if (!fill_tree_descriptor(r, &desc[nr++], oid)) { |
| 157 | ret = error(_("failed to find tree of %s"), oid_to_hex(oid)); |
| 158 | goto leave_reset_head; |
| 159 | } |
| 160 | |
| 161 | if (unpack_trees(nr, desc, &unpack_tree_opts)) { |
| 162 | ret = -1; |
| 163 | goto leave_reset_head; |
| 164 | } |
| 165 | |
| 166 | tree = repo_parse_tree_indirect(the_repository, oid); |
| 167 | if (!tree) { |
| 168 | ret = error(_("unable to read tree (%s)"), oid_to_hex(oid)); |
| 169 | goto leave_reset_head; |
| 170 | } |
| 171 | |
| 172 | prime_cache_tree(r, r->index, tree); |
| 173 | |
| 174 | if (write_locked_index(r->index, &lock, COMMIT_LOCK) < 0) { |
| 175 | ret = error(_("could not write index")); |
| 176 | goto leave_reset_head; |
| 177 | } |
| 178 | |
| 179 | if (oid != &head_oid || update_orig_head || switch_to_branch) |
| 180 | ret = update_refs(opts, oid, head); |
| 181 | |
| 182 | leave_reset_head: |
| 183 | rollback_lock_file(&lock); |
| 184 | clear_unpack_trees_porcelain(&unpack_tree_opts); |
| 185 | while (nr) |
| 186 | free((void *)desc[--nr].buffer); |
| 187 | return ret; |
| 188 | |
| 189 | } |