#include "cache.h" #include "refs.h" #include "builtin.h" #include "parse-options.h" #include "quote.h" #include "argv-array.h" static const char * const git_update_ref_usage[] = { N_("git update-ref [options] -d <refname> [<oldval>]"), N_("git update-ref [options] <refname> <newval> [<oldval>]"), N_("git update-ref [options] --stdin [-z]"), NULL }; static int updates_alloc; static int updates_count; static const struct ref_update **updates; static char line_termination = '\n'; static int update_flags; static struct ref_update *update_alloc(void) { struct ref_update *update; /* Allocate and zero-init a struct ref_update */ update = xcalloc(1, sizeof(*update)); ALLOC_GROW(updates, updates_count + 1, updates_alloc); updates[updates_count++] = update; /* Store and reset accumulated options */ update->flags = update_flags; update_flags = 0; return update; } static void update_store_ref_name(struct ref_update *update, const char *ref_name) { if (check_refname_format(ref_name, REFNAME_ALLOW_ONELEVEL)) die("invalid ref format: %s", ref_name); update->ref_name = xstrdup(ref_name); } static void update_store_new_sha1(struct ref_update *update, const char *newvalue) { if (*newvalue && get_sha1(newvalue, update->new_sha1)) die("invalid new value for ref %s: %s", update->ref_name, newvalue); } static void update_store_old_sha1(struct ref_update *update, const char *oldvalue) { if (*oldvalue && get_sha1(oldvalue, update->old_sha1)) die("invalid old value for ref %s: %s", update->ref_name, oldvalue); /* We have an old value if non-empty, or if empty without -z */ update->have_old = *oldvalue || line_termination; } static const char *parse_arg(const char *next, struct strbuf *arg) { /* Parse SP-terminated, possibly C-quoted argument */ if (*next != '"') while (*next && !isspace(*next)) strbuf_addch(arg, *next++); else if (unquote_c_style(arg, next, &next)) die("badly quoted argument: %s", next); /* Return position after the argument */ return next; } static const char *parse_first_arg(const char *next, struct strbuf *arg) { /* Parse argument immediately after "command SP" */ strbuf_reset(arg); if (line_termination) { /* Without -z, use the next argument */ next = parse_arg(next, arg); } else { /* With -z, use rest of first NUL-terminated line */ strbuf_addstr(arg, next); next = next + arg->len; } return next; } static const char *parse_next_arg(const char *next, struct strbuf *arg) { /* Parse next SP-terminated or NUL-terminated argument, if any */ strbuf_reset(arg); if (line_termination) { /* Without -z, consume SP and use next argument */ if (!*next) return NULL; if (*next != ' ') die("expected SP but got: %s", next); next = parse_arg(next + 1, arg); } else { /* With -z, read the next NUL-terminated line */ if (*next) die("expected NUL but got: %s", next); if (strbuf_getline(arg, stdin, '\0') == EOF) return NULL; next = arg->buf + arg->len; } return next; } static void parse_cmd_update(const char *next) { struct strbuf ref = STRBUF_INIT; struct strbuf newvalue = STRBUF_INIT; struct strbuf oldvalue = STRBUF_INIT; struct ref_update *update; update = update_alloc(); if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0]) update_store_ref_name(update, ref.buf); else die("update line missing <ref>"); if ((next = parse_next_arg(next, &newvalue)) != NULL) update_store_new_sha1(update, newvalue.buf); else die("update %s missing <newvalue>", ref.buf); if ((next = parse_next_arg(next, &oldvalue)) != NULL) update_store_old_sha1(update, oldvalue.buf); else if(!line_termination) die("update %s missing [<oldvalue>] NUL", ref.buf); if (next && *next) die("update %s has extra input: %s", ref.buf, next); } static void parse_cmd_create(const char *next) { struct strbuf ref = STRBUF_INIT; struct strbuf newvalue = STRBUF_INIT; struct ref_update *update; update = update_alloc(); if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0]) update_store_ref_name(update, ref.buf); else die("create line missing <ref>"); if ((next = parse_next_arg(next, &newvalue)) != NULL) update_store_new_sha1(update, newvalue.buf); else die("create %s missing <newvalue>", ref.buf); if (is_null_sha1(update->new_sha1)) die("create %s given zero new value", ref.buf); if (next && *next) die("create %s has extra input: %s", ref.buf, next); } static void parse_cmd_delete(const char *next) { struct strbuf ref = STRBUF_INIT; struct strbuf oldvalue = STRBUF_INIT; struct ref_update *update; update = update_alloc(); if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0]) update_store_ref_name(update, ref.buf); else die("delete line missing <ref>"); if ((next = parse_next_arg(next, &oldvalue)) != NULL) update_store_old_sha1(update, oldvalue.buf); else if(!line_termination) die("delete %s missing [<oldvalue>] NUL", ref.buf); if (update->have_old && is_null_sha1(update->old_sha1)) die("delete %s given zero old value", ref.buf); if (next && *next) die("delete %s has extra input: %s", ref.buf, next); } static void parse_cmd_verify(const char *next) { struct strbuf ref = STRBUF_INIT; struct strbuf value = STRBUF_INIT; struct ref_update *update; update = update_alloc(); if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0]) update_store_ref_name(update, ref.buf); else die("verify line missing <ref>"); if ((next = parse_next_arg(next, &value)) != NULL) { update_store_old_sha1(update, value.buf); update_store_new_sha1(update, value.buf); } else if(!line_termination) die("verify %s missing [<oldvalue>] NUL", ref.buf); if (next && *next) die("verify %s has extra input: %s", ref.buf, next); } static void parse_cmd_option(const char *next) { if (!strcmp(next, "no-deref")) update_flags |= REF_NODEREF; else die("option unknown: %s", next); } static void update_refs_stdin(void) { struct strbuf cmd = STRBUF_INIT; /* Read each line dispatch its command */ while (strbuf_getline(&cmd, stdin, line_termination) != EOF) if (!cmd.buf[0]) die("empty command in input"); else if (isspace(*cmd.buf)) die("whitespace before command: %s", cmd.buf); else if (starts_with(cmd.buf, "update ")) parse_cmd_update(cmd.buf + 7); else if (starts_with(cmd.buf, "create ")) parse_cmd_create(cmd.buf + 7); else if (starts_with(cmd.buf, "delete ")) parse_cmd_delete(cmd.buf + 7); else if (starts_with(cmd.buf, "verify ")) parse_cmd_verify(cmd.buf + 7); else if (starts_with(cmd.buf, "option ")) parse_cmd_option(cmd.buf + 7); else die("unknown command: %s", cmd.buf); strbuf_release(&cmd); } int cmd_update_ref(int argc, const char **argv, const char *prefix) { const char *refname, *oldval, *msg = NULL; unsigned char sha1[20], oldsha1[20]; int delete = 0, no_deref = 0, read_stdin = 0, end_null = 0, flags = 0; struct option options[] = { OPT_STRING( 'm', NULL, &msg, N_("reason"), N_("reason of the update")), OPT_BOOL('d', NULL, &delete, N_("delete the reference")), OPT_BOOL( 0 , "no-deref", &no_deref, N_("update <refname> not the one it points to")), OPT_BOOL('z', NULL, &end_null, N_("stdin has NUL-terminated arguments")), OPT_BOOL( 0 , "stdin", &read_stdin, N_("read updates from stdin")), OPT_END(), }; git_config(git_default_config, NULL); argc = parse_options(argc, argv, prefix, options, git_update_ref_usage, 0); if (msg && !*msg) die("Refusing to perform update with empty message."); if (read_stdin) { if (delete || no_deref || argc > 0) usage_with_options(git_update_ref_usage, options); if (end_null) line_termination = '\0'; update_refs_stdin(); return update_refs(msg, updates, updates_count, DIE_ON_ERR); } if (end_null) usage_with_options(git_update_ref_usage, options); if (delete) { if (argc < 1 || argc > 2) usage_with_options(git_update_ref_usage, options); refname = argv[0]; oldval = argv[1]; } else { const char *value; if (argc < 2 || argc > 3) usage_with_options(git_update_ref_usage, options); refname = argv[0]; value = argv[1]; oldval = argv[2]; if (get_sha1(value, sha1)) die("%s: not a valid SHA1", value); } hashclr(oldsha1); /* all-zero hash in case oldval is the empty string */ if (oldval && *oldval && get_sha1(oldval, oldsha1)) die("%s: not a valid old SHA1", oldval); if (no_deref) flags = REF_NODEREF; if (delete) return delete_ref(refname, oldval ? oldsha1 : NULL, flags); else return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL, flags, DIE_ON_ERR); }