Andrew's git - gitweb.git/blob - builtin/update-ref.c

   1#include "cache.h"
   2#include "refs.h"
   3#include "builtin.h"
   4#include "parse-options.h"
   5#include "quote.h"
   6#include "argv-array.h"
   7
   8static const char * const git_update_ref_usage[] = {
   9        N_("git update-ref [options] -d <refname> [<oldval>]"),
  10        N_("git update-ref [options]    <refname> <newval> [<oldval>]"),
  11        N_("git update-ref [options] --stdin [-z]"),
  12        NULL
  13};
  14
  15static int updates_alloc;
  16static int updates_count;
  17static const struct ref_update **updates;
  18
  19static char line_termination = '\n';
  20static int update_flags;
  21
  22static struct ref_update *update_alloc(void)
  23{
  24        struct ref_update *update;
  25
  26        /* Allocate and zero-init a struct ref_update */
  27        update = xcalloc(1, sizeof(*update));
  28        ALLOC_GROW(updates, updates_count + 1, updates_alloc);
  29        updates[updates_count++] = update;
  30
  31        /* Store and reset accumulated options */
  32        update->flags = update_flags;
  33        update_flags = 0;
  34
  35        return update;
  36}
  37
  38static void update_store_ref_name(struct ref_update *update,
  39                                  const char *ref_name)
  40{
  41        if (check_refname_format(ref_name, REFNAME_ALLOW_ONELEVEL))
  42                die("invalid ref format: %s", ref_name);
  43        update->ref_name = xstrdup(ref_name);
  44}
  45
  46static void update_store_new_sha1(struct ref_update *update,
  47                                  const char *newvalue)
  48{
  49        if (*newvalue && get_sha1(newvalue, update->new_sha1))
  50                die("invalid new value for ref %s: %s",
  51                    update->ref_name, newvalue);
  52}
  53
  54static void update_store_old_sha1(struct ref_update *update,
  55                                  const char *oldvalue)
  56{
  57        if (*oldvalue && get_sha1(oldvalue, update->old_sha1))
  58                die("invalid old value for ref %s: %s",
  59                    update->ref_name, oldvalue);
  60
  61        /* We have an old value if non-empty, or if empty without -z */
  62        update->have_old = *oldvalue || line_termination;
  63}
  64
  65static const char *parse_arg(const char *next, struct strbuf *arg)
  66{
  67        /* Parse SP-terminated, possibly C-quoted argument */
  68        if (*next != '"')
  69                while (*next && !isspace(*next))
  70                        strbuf_addch(arg, *next++);
  71        else if (unquote_c_style(arg, next, &next))
  72                die("badly quoted argument: %s", next);
  73
  74        /* Return position after the argument */
  75        return next;
  76}
  77
  78static const char *parse_first_arg(const char *next, struct strbuf *arg)
  79{
  80        /* Parse argument immediately after "command SP" */
  81        strbuf_reset(arg);
  82        if (line_termination) {
  83                /* Without -z, use the next argument */
  84                next = parse_arg(next, arg);
  85        } else {
  86                /* With -z, use rest of first NUL-terminated line */
  87                strbuf_addstr(arg, next);
  88                next = next + arg->len;
  89        }
  90        return next;
  91}
  92
  93static const char *parse_next_arg(const char *next, struct strbuf *arg)
  94{
  95        /* Parse next SP-terminated or NUL-terminated argument, if any */
  96        strbuf_reset(arg);
  97        if (line_termination) {
  98                /* Without -z, consume SP and use next argument */
  99                if (!*next)
 100                        return NULL;
 101                if (*next != ' ')
 102                        die("expected SP but got: %s", next);
 103                next = parse_arg(next + 1, arg);
 104        } else {
 105                /* With -z, read the next NUL-terminated line */
 106                if (*next)
 107                        die("expected NUL but got: %s", next);
 108                if (strbuf_getline(arg, stdin, '\0') == EOF)
 109                        return NULL;
 110                next = arg->buf + arg->len;
 111        }
 112        return next;
 113}
 114
 115static void parse_cmd_update(const char *next)
 116{
 117        struct strbuf ref = STRBUF_INIT;
 118        struct strbuf newvalue = STRBUF_INIT;
 119        struct strbuf oldvalue = STRBUF_INIT;
 120        struct ref_update *update;
 121
 122        update = update_alloc();
 123
 124        if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0])
 125                update_store_ref_name(update, ref.buf);
 126        else
 127                die("update line missing <ref>");
 128
 129        if ((next = parse_next_arg(next, &newvalue)) != NULL)
 130                update_store_new_sha1(update, newvalue.buf);
 131        else
 132                die("update %s missing <newvalue>", ref.buf);
 133
 134        if ((next = parse_next_arg(next, &oldvalue)) != NULL)
 135                update_store_old_sha1(update, oldvalue.buf);
 136        else if(!line_termination)
 137                die("update %s missing [<oldvalue>] NUL", ref.buf);
 138
 139        if (next && *next)
 140                die("update %s has extra input: %s", ref.buf, next);
 141}
 142
 143static void parse_cmd_create(const char *next)
 144{
 145        struct strbuf ref = STRBUF_INIT;
 146        struct strbuf newvalue = STRBUF_INIT;
 147        struct ref_update *update;
 148
 149        update = update_alloc();
 150
 151        if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0])
 152                update_store_ref_name(update, ref.buf);
 153        else
 154                die("create line missing <ref>");
 155
 156        if ((next = parse_next_arg(next, &newvalue)) != NULL)
 157                update_store_new_sha1(update, newvalue.buf);
 158        else
 159                die("create %s missing <newvalue>", ref.buf);
 160        if (is_null_sha1(update->new_sha1))
 161                die("create %s given zero new value", ref.buf);
 162
 163        if (next && *next)
 164                die("create %s has extra input: %s", ref.buf, next);
 165}
 166
 167static void parse_cmd_delete(const char *next)
 168{
 169        struct strbuf ref = STRBUF_INIT;
 170        struct strbuf oldvalue = STRBUF_INIT;
 171        struct ref_update *update;
 172
 173        update = update_alloc();
 174
 175        if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0])
 176                update_store_ref_name(update, ref.buf);
 177        else
 178                die("delete line missing <ref>");
 179
 180        if ((next = parse_next_arg(next, &oldvalue)) != NULL)
 181                update_store_old_sha1(update, oldvalue.buf);
 182        else if(!line_termination)
 183                die("delete %s missing [<oldvalue>] NUL", ref.buf);
 184        if (update->have_old && is_null_sha1(update->old_sha1))
 185                die("delete %s given zero old value", ref.buf);
 186
 187        if (next && *next)
 188                die("delete %s has extra input: %s", ref.buf, next);
 189}
 190
 191static void parse_cmd_verify(const char *next)
 192{
 193        struct strbuf ref = STRBUF_INIT;
 194        struct strbuf value = STRBUF_INIT;
 195        struct ref_update *update;
 196
 197        update = update_alloc();
 198
 199        if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0])
 200                update_store_ref_name(update, ref.buf);
 201        else
 202                die("verify line missing <ref>");
 203
 204        if ((next = parse_next_arg(next, &value)) != NULL) {
 205                update_store_old_sha1(update, value.buf);
 206                update_store_new_sha1(update, value.buf);
 207        } else if(!line_termination)
 208                die("verify %s missing [<oldvalue>] NUL", ref.buf);
 209
 210        if (next && *next)
 211                die("verify %s has extra input: %s", ref.buf, next);
 212}
 213
 214static void parse_cmd_option(const char *next)
 215{
 216        if (!strcmp(next, "no-deref"))
 217                update_flags |= REF_NODEREF;
 218        else
 219                die("option unknown: %s", next);
 220}
 221
 222static void update_refs_stdin(void)
 223{
 224        struct strbuf cmd = STRBUF_INIT;
 225
 226        /* Read each line dispatch its command */
 227        while (strbuf_getline(&cmd, stdin, line_termination) != EOF)
 228                if (!cmd.buf[0])
 229                        die("empty command in input");
 230                else if (isspace(*cmd.buf))
 231                        die("whitespace before command: %s", cmd.buf);
 232                else if (starts_with(cmd.buf, "update "))
 233                        parse_cmd_update(cmd.buf + 7);
 234                else if (starts_with(cmd.buf, "create "))
 235                        parse_cmd_create(cmd.buf + 7);
 236                else if (starts_with(cmd.buf, "delete "))
 237                        parse_cmd_delete(cmd.buf + 7);
 238                else if (starts_with(cmd.buf, "verify "))
 239                        parse_cmd_verify(cmd.buf + 7);
 240                else if (starts_with(cmd.buf, "option "))
 241                        parse_cmd_option(cmd.buf + 7);
 242                else
 243                        die("unknown command: %s", cmd.buf);
 244
 245        strbuf_release(&cmd);
 246}
 247
 248int cmd_update_ref(int argc, const char **argv, const char *prefix)
 249{
 250        const char *refname, *oldval, *msg = NULL;
 251        unsigned char sha1[20], oldsha1[20];
 252        int delete = 0, no_deref = 0, read_stdin = 0, end_null = 0, flags = 0;
 253        struct option options[] = {
 254                OPT_STRING( 'm', NULL, &msg, N_("reason"), N_("reason of the update")),
 255                OPT_BOOL('d', NULL, &delete, N_("delete the reference")),
 256                OPT_BOOL( 0 , "no-deref", &no_deref,
 257                                        N_("update <refname> not the one it points to")),
 258                OPT_BOOL('z', NULL, &end_null, N_("stdin has NUL-terminated arguments")),
 259                OPT_BOOL( 0 , "stdin", &read_stdin, N_("read updates from stdin")),
 260                OPT_END(),
 261        };
 262
 263        git_config(git_default_config, NULL);
 264        argc = parse_options(argc, argv, prefix, options, git_update_ref_usage,
 265                             0);
 266        if (msg && !*msg)
 267                die("Refusing to perform update with empty message.");
 268
 269        if (read_stdin) {
 270                if (delete || no_deref || argc > 0)
 271                        usage_with_options(git_update_ref_usage, options);
 272                if (end_null)
 273                        line_termination = '\0';
 274                update_refs_stdin();
 275                return update_refs(msg, updates, updates_count, DIE_ON_ERR);
 276        }
 277
 278        if (end_null)
 279                usage_with_options(git_update_ref_usage, options);
 280
 281        if (delete) {
 282                if (argc < 1 || argc > 2)
 283                        usage_with_options(git_update_ref_usage, options);
 284                refname = argv[0];
 285                oldval = argv[1];
 286        } else {
 287                const char *value;
 288                if (argc < 2 || argc > 3)
 289                        usage_with_options(git_update_ref_usage, options);
 290                refname = argv[0];
 291                value = argv[1];
 292                oldval = argv[2];
 293                if (get_sha1(value, sha1))
 294                        die("%s: not a valid SHA1", value);
 295        }
 296
 297        hashclr(oldsha1); /* all-zero hash in case oldval is the empty string */
 298        if (oldval && *oldval && get_sha1(oldval, oldsha1))
 299                die("%s: not a valid old SHA1", oldval);
 300
 301        if (no_deref)
 302                flags = REF_NODEREF;
 303        if (delete)
 304                return delete_ref(refname, oldval ? oldsha1 : NULL, flags);
 305        else
 306                return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
 307                                  flags, DIE_ON_ERR);
 308}