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![brian m. carlson](/assets/img/avatar_default.png)
All but two of the call sites already have parameters using the hash parameter of struct object_id, so convert them to take a pointer to the struct directly. Also convert refs_read_refs_full, the underlying implementation. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
506 lines
14 KiB
C
506 lines
14 KiB
C
/*
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* Builtin "git replace"
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*
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* Copyright (c) 2008 Christian Couder <chriscool@tuxfamily.org>
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*
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* Based on builtin/tag.c by Kristian Høgsberg <krh@redhat.com>
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* and Carlos Rica <jasampler@gmail.com> that was itself based on
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* git-tag.sh and mktag.c by Linus Torvalds.
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*/
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#include "cache.h"
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#include "config.h"
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#include "builtin.h"
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#include "refs.h"
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#include "parse-options.h"
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#include "run-command.h"
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#include "tag.h"
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static const char * const git_replace_usage[] = {
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N_("git replace [-f] <object> <replacement>"),
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N_("git replace [-f] --edit <object>"),
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N_("git replace [-f] --graft <commit> [<parent>...]"),
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N_("git replace -d <object>..."),
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N_("git replace [--format=<format>] [-l [<pattern>]]"),
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NULL
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};
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enum replace_format {
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REPLACE_FORMAT_SHORT,
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REPLACE_FORMAT_MEDIUM,
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REPLACE_FORMAT_LONG
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};
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struct show_data {
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const char *pattern;
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enum replace_format format;
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};
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static int show_reference(const char *refname, const struct object_id *oid,
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int flag, void *cb_data)
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{
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struct show_data *data = cb_data;
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if (!wildmatch(data->pattern, refname, 0)) {
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if (data->format == REPLACE_FORMAT_SHORT)
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printf("%s\n", refname);
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else if (data->format == REPLACE_FORMAT_MEDIUM)
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printf("%s -> %s\n", refname, oid_to_hex(oid));
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else { /* data->format == REPLACE_FORMAT_LONG */
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struct object_id object;
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enum object_type obj_type, repl_type;
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if (get_oid(refname, &object))
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return error("Failed to resolve '%s' as a valid ref.", refname);
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obj_type = sha1_object_info(object.hash, NULL);
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repl_type = sha1_object_info(oid->hash, NULL);
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printf("%s (%s) -> %s (%s)\n", refname, typename(obj_type),
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oid_to_hex(oid), typename(repl_type));
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}
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}
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return 0;
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}
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static int list_replace_refs(const char *pattern, const char *format)
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{
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struct show_data data;
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if (pattern == NULL)
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pattern = "*";
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data.pattern = pattern;
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if (format == NULL || *format == '\0' || !strcmp(format, "short"))
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data.format = REPLACE_FORMAT_SHORT;
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else if (!strcmp(format, "medium"))
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data.format = REPLACE_FORMAT_MEDIUM;
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else if (!strcmp(format, "long"))
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data.format = REPLACE_FORMAT_LONG;
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else
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die("invalid replace format '%s'\n"
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"valid formats are 'short', 'medium' and 'long'\n",
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format);
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for_each_replace_ref(show_reference, (void *)&data);
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return 0;
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}
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typedef int (*each_replace_name_fn)(const char *name, const char *ref,
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const struct object_id *oid);
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static int for_each_replace_name(const char **argv, each_replace_name_fn fn)
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{
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const char **p, *full_hex;
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struct strbuf ref = STRBUF_INIT;
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size_t base_len;
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int had_error = 0;
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struct object_id oid;
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strbuf_addstr(&ref, git_replace_ref_base);
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base_len = ref.len;
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for (p = argv; *p; p++) {
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if (get_oid(*p, &oid)) {
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error("Failed to resolve '%s' as a valid ref.", *p);
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had_error = 1;
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continue;
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}
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strbuf_setlen(&ref, base_len);
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strbuf_addstr(&ref, oid_to_hex(&oid));
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full_hex = ref.buf + base_len;
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if (read_ref(ref.buf, &oid)) {
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error("replace ref '%s' not found.", full_hex);
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had_error = 1;
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continue;
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}
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if (fn(full_hex, ref.buf, &oid))
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had_error = 1;
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}
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strbuf_release(&ref);
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return had_error;
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}
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static int delete_replace_ref(const char *name, const char *ref,
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const struct object_id *oid)
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{
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if (delete_ref(NULL, ref, oid, 0))
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return 1;
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printf("Deleted replace ref '%s'\n", name);
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return 0;
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}
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static void check_ref_valid(struct object_id *object,
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struct object_id *prev,
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struct strbuf *ref,
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int force)
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{
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strbuf_reset(ref);
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strbuf_addf(ref, "%s%s", git_replace_ref_base, oid_to_hex(object));
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if (check_refname_format(ref->buf, 0))
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die("'%s' is not a valid ref name.", ref->buf);
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if (read_ref(ref->buf, prev))
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oidclr(prev);
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else if (!force)
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die("replace ref '%s' already exists", ref->buf);
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}
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static int replace_object_oid(const char *object_ref,
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struct object_id *object,
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const char *replace_ref,
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struct object_id *repl,
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int force)
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{
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struct object_id prev;
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enum object_type obj_type, repl_type;
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struct strbuf ref = STRBUF_INIT;
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struct ref_transaction *transaction;
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struct strbuf err = STRBUF_INIT;
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obj_type = sha1_object_info(object->hash, NULL);
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repl_type = sha1_object_info(repl->hash, NULL);
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if (!force && obj_type != repl_type)
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die("Objects must be of the same type.\n"
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"'%s' points to a replaced object of type '%s'\n"
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"while '%s' points to a replacement object of type '%s'.",
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object_ref, typename(obj_type),
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replace_ref, typename(repl_type));
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check_ref_valid(object, &prev, &ref, force);
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transaction = ref_transaction_begin(&err);
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if (!transaction ||
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ref_transaction_update(transaction, ref.buf, repl, &prev,
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0, NULL, &err) ||
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ref_transaction_commit(transaction, &err))
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die("%s", err.buf);
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ref_transaction_free(transaction);
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strbuf_release(&ref);
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return 0;
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}
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static int replace_object(const char *object_ref, const char *replace_ref, int force)
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{
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struct object_id object, repl;
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if (get_oid(object_ref, &object))
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die("Failed to resolve '%s' as a valid ref.", object_ref);
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if (get_oid(replace_ref, &repl))
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die("Failed to resolve '%s' as a valid ref.", replace_ref);
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return replace_object_oid(object_ref, &object, replace_ref, &repl, force);
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}
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/*
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* Write the contents of the object named by "sha1" to the file "filename".
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* If "raw" is true, then the object's raw contents are printed according to
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* "type". Otherwise, we pretty-print the contents for human editing.
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*/
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static void export_object(const struct object_id *oid, enum object_type type,
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int raw, const char *filename)
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{
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struct child_process cmd = CHILD_PROCESS_INIT;
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int fd;
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fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
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if (fd < 0)
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die_errno("unable to open %s for writing", filename);
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argv_array_push(&cmd.args, "--no-replace-objects");
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argv_array_push(&cmd.args, "cat-file");
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if (raw)
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argv_array_push(&cmd.args, typename(type));
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else
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argv_array_push(&cmd.args, "-p");
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argv_array_push(&cmd.args, oid_to_hex(oid));
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cmd.git_cmd = 1;
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cmd.out = fd;
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if (run_command(&cmd))
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die("cat-file reported failure");
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}
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/*
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* Read a previously-exported (and possibly edited) object back from "filename",
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* interpreting it as "type", and writing the result to the object database.
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* The sha1 of the written object is returned via sha1.
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*/
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static void import_object(struct object_id *oid, enum object_type type,
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int raw, const char *filename)
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{
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int fd;
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fd = open(filename, O_RDONLY);
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if (fd < 0)
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die_errno("unable to open %s for reading", filename);
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if (!raw && type == OBJ_TREE) {
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const char *argv[] = { "mktree", NULL };
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struct child_process cmd = CHILD_PROCESS_INIT;
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struct strbuf result = STRBUF_INIT;
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cmd.argv = argv;
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cmd.git_cmd = 1;
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cmd.in = fd;
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cmd.out = -1;
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if (start_command(&cmd))
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die("unable to spawn mktree");
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if (strbuf_read(&result, cmd.out, 41) < 0)
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die_errno("unable to read from mktree");
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close(cmd.out);
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if (finish_command(&cmd))
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die("mktree reported failure");
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if (get_oid_hex(result.buf, oid) < 0)
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die("mktree did not return an object name");
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strbuf_release(&result);
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} else {
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struct stat st;
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int flags = HASH_FORMAT_CHECK | HASH_WRITE_OBJECT;
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if (fstat(fd, &st) < 0)
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die_errno("unable to fstat %s", filename);
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if (index_fd(oid, fd, &st, type, NULL, flags) < 0)
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die("unable to write object to database");
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/* index_fd close()s fd for us */
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}
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/*
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* No need to close(fd) here; both run-command and index-fd
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* will have done it for us.
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*/
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}
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static int edit_and_replace(const char *object_ref, int force, int raw)
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{
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char *tmpfile = git_pathdup("REPLACE_EDITOBJ");
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enum object_type type;
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struct object_id old, new, prev;
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struct strbuf ref = STRBUF_INIT;
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if (get_oid(object_ref, &old) < 0)
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die("Not a valid object name: '%s'", object_ref);
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type = sha1_object_info(old.hash, NULL);
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if (type < 0)
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die("unable to get object type for %s", oid_to_hex(&old));
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check_ref_valid(&old, &prev, &ref, force);
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strbuf_release(&ref);
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export_object(&old, type, raw, tmpfile);
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if (launch_editor(tmpfile, NULL, NULL) < 0)
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die("editing object file failed");
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import_object(&new, type, raw, tmpfile);
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free(tmpfile);
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if (!oidcmp(&old, &new))
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return error("new object is the same as the old one: '%s'", oid_to_hex(&old));
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return replace_object_oid(object_ref, &old, "replacement", &new, force);
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}
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static void replace_parents(struct strbuf *buf, int argc, const char **argv)
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{
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struct strbuf new_parents = STRBUF_INIT;
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const char *parent_start, *parent_end;
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int i;
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/* find existing parents */
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parent_start = buf->buf;
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parent_start += GIT_SHA1_HEXSZ + 6; /* "tree " + "hex sha1" + "\n" */
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parent_end = parent_start;
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while (starts_with(parent_end, "parent "))
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parent_end += 48; /* "parent " + "hex sha1" + "\n" */
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/* prepare new parents */
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for (i = 0; i < argc; i++) {
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struct object_id oid;
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if (get_oid(argv[i], &oid) < 0)
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die(_("Not a valid object name: '%s'"), argv[i]);
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lookup_commit_or_die(&oid, argv[i]);
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strbuf_addf(&new_parents, "parent %s\n", oid_to_hex(&oid));
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}
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/* replace existing parents with new ones */
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strbuf_splice(buf, parent_start - buf->buf, parent_end - parent_start,
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new_parents.buf, new_parents.len);
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strbuf_release(&new_parents);
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}
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struct check_mergetag_data {
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int argc;
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const char **argv;
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};
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static void check_one_mergetag(struct commit *commit,
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struct commit_extra_header *extra,
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void *data)
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{
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struct check_mergetag_data *mergetag_data = (struct check_mergetag_data *)data;
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const char *ref = mergetag_data->argv[0];
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struct object_id tag_oid;
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struct tag *tag;
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int i;
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hash_sha1_file(extra->value, extra->len, typename(OBJ_TAG), tag_oid.hash);
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tag = lookup_tag(&tag_oid);
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if (!tag)
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die(_("bad mergetag in commit '%s'"), ref);
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if (parse_tag_buffer(tag, extra->value, extra->len))
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die(_("malformed mergetag in commit '%s'"), ref);
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/* iterate over new parents */
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for (i = 1; i < mergetag_data->argc; i++) {
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struct object_id oid;
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if (get_oid(mergetag_data->argv[i], &oid) < 0)
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die(_("Not a valid object name: '%s'"), mergetag_data->argv[i]);
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if (!oidcmp(&tag->tagged->oid, &oid))
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return; /* found */
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}
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die(_("original commit '%s' contains mergetag '%s' that is discarded; "
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"use --edit instead of --graft"), ref, oid_to_hex(&tag_oid));
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}
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static void check_mergetags(struct commit *commit, int argc, const char **argv)
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{
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struct check_mergetag_data mergetag_data;
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mergetag_data.argc = argc;
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mergetag_data.argv = argv;
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for_each_mergetag(check_one_mergetag, commit, &mergetag_data);
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}
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static int create_graft(int argc, const char **argv, int force)
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{
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struct object_id old, new;
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const char *old_ref = argv[0];
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struct commit *commit;
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struct strbuf buf = STRBUF_INIT;
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const char *buffer;
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unsigned long size;
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if (get_oid(old_ref, &old) < 0)
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die(_("Not a valid object name: '%s'"), old_ref);
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commit = lookup_commit_or_die(&old, old_ref);
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buffer = get_commit_buffer(commit, &size);
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strbuf_add(&buf, buffer, size);
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unuse_commit_buffer(commit, buffer);
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replace_parents(&buf, argc - 1, &argv[1]);
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if (remove_signature(&buf)) {
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warning(_("the original commit '%s' has a gpg signature."), old_ref);
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warning(_("the signature will be removed in the replacement commit!"));
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}
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check_mergetags(commit, argc, argv);
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if (write_sha1_file(buf.buf, buf.len, commit_type, new.hash))
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die(_("could not write replacement commit for: '%s'"), old_ref);
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strbuf_release(&buf);
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if (!oidcmp(&old, &new))
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return error("new commit is the same as the old one: '%s'", oid_to_hex(&old));
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return replace_object_oid(old_ref, &old, "replacement", &new, force);
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}
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int cmd_replace(int argc, const char **argv, const char *prefix)
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{
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int force = 0;
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int raw = 0;
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const char *format = NULL;
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enum {
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MODE_UNSPECIFIED = 0,
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MODE_LIST,
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MODE_DELETE,
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MODE_EDIT,
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MODE_GRAFT,
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MODE_REPLACE
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} cmdmode = MODE_UNSPECIFIED;
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struct option options[] = {
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OPT_CMDMODE('l', "list", &cmdmode, N_("list replace refs"), MODE_LIST),
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OPT_CMDMODE('d', "delete", &cmdmode, N_("delete replace refs"), MODE_DELETE),
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OPT_CMDMODE('e', "edit", &cmdmode, N_("edit existing object"), MODE_EDIT),
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OPT_CMDMODE('g', "graft", &cmdmode, N_("change a commit's parents"), MODE_GRAFT),
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OPT_BOOL('f', "force", &force, N_("replace the ref if it exists")),
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OPT_BOOL(0, "raw", &raw, N_("do not pretty-print contents for --edit")),
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OPT_STRING(0, "format", &format, N_("format"), N_("use this format")),
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OPT_END()
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};
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check_replace_refs = 0;
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git_config(git_default_config, NULL);
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argc = parse_options(argc, argv, prefix, options, git_replace_usage, 0);
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if (!cmdmode)
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cmdmode = argc ? MODE_REPLACE : MODE_LIST;
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if (format && cmdmode != MODE_LIST)
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usage_msg_opt("--format cannot be used when not listing",
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git_replace_usage, options);
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if (force &&
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cmdmode != MODE_REPLACE &&
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cmdmode != MODE_EDIT &&
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cmdmode != MODE_GRAFT)
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usage_msg_opt("-f only makes sense when writing a replacement",
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git_replace_usage, options);
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if (raw && cmdmode != MODE_EDIT)
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usage_msg_opt("--raw only makes sense with --edit",
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git_replace_usage, options);
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switch (cmdmode) {
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case MODE_DELETE:
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if (argc < 1)
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usage_msg_opt("-d needs at least one argument",
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git_replace_usage, options);
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return for_each_replace_name(argv, delete_replace_ref);
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case MODE_REPLACE:
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if (argc != 2)
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usage_msg_opt("bad number of arguments",
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git_replace_usage, options);
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return replace_object(argv[0], argv[1], force);
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case MODE_EDIT:
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if (argc != 1)
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usage_msg_opt("-e needs exactly one argument",
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git_replace_usage, options);
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return edit_and_replace(argv[0], force, raw);
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case MODE_GRAFT:
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if (argc < 1)
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usage_msg_opt("-g needs at least one argument",
|
|
git_replace_usage, options);
|
|
return create_graft(argc, argv, force);
|
|
|
|
case MODE_LIST:
|
|
if (argc > 1)
|
|
usage_msg_opt("only one pattern can be given with -l",
|
|
git_replace_usage, options);
|
|
return list_replace_refs(argv[0], format);
|
|
|
|
default:
|
|
die("BUG: invalid cmdmode %d", (int)cmdmode);
|
|
}
|
|
}
|