#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> [<old-val>]"), N_("git update-ref [<options>] <refname> <new-val> [<old-val>]"), N_("git update-ref [<options>] --stdin [-z]"), NULL }; static char line_termination = '\n'; static int update_flags; static unsigned create_reflog_flag; static const char *msg; /* * Parse one whitespace- or NUL-terminated, possibly C-quoted argument * and append the result to arg. Return a pointer to the terminator. * Die if there is an error in how the argument is C-quoted. This * function is only used if not -z. */ static const char *parse_arg(const char *next, struct strbuf *arg) { if (*next == '"') { const char *orig = next; if (unquote_c_style(arg, next, &next)) die("badly quoted argument: %s", orig); if (*next && !isspace(*next)) die("unexpected character after quoted argument: %s", orig); } else { while (*next && !isspace(*next)) strbuf_addch(arg, *next++); } return next; } /* * Parse the reference name immediately after "command SP". If not * -z, then handle C-quoting. Return a pointer to a newly allocated * string containing the name of the reference, or NULL if there was * an error. Update *next to point at the character that terminates * the argument. Die if C-quoting is malformed or the reference name * is invalid. */ static char *parse_refname(struct strbuf *input, const char **next) { struct strbuf ref = STRBUF_INIT; if (line_termination) { /* Without -z, use the next argument */ *next = parse_arg(*next, &ref); } else { /* With -z, use everything up to the next NUL */ strbuf_addstr(&ref, *next); *next += ref.len; } if (!ref.len) { strbuf_release(&ref); return NULL; } if (check_refname_format(ref.buf, REFNAME_ALLOW_ONELEVEL)) die("invalid ref format: %s", ref.buf); return strbuf_detach(&ref, NULL); } /* * The value being parsed is <oldvalue> (as opposed to <newvalue>; the * difference affects which error messages are generated): */ #define PARSE_SHA1_OLD 0x01 /* * For backwards compatibility, accept an empty string for update's * <newvalue> in binary mode to be equivalent to specifying zeros. */ #define PARSE_SHA1_ALLOW_EMPTY 0x02 /* * Parse an argument separator followed by the next argument, if any. * If there is an argument, convert it to a SHA-1, write it to sha1, * set *next to point at the character terminating the argument, and * return 0. If there is no argument at all (not even the empty * string), return 1 and leave *next unchanged. If the value is * provided but cannot be converted to a SHA-1, die. flags can * include PARSE_SHA1_OLD and/or PARSE_SHA1_ALLOW_EMPTY. */ static int parse_next_sha1(struct strbuf *input, const char **next, unsigned char *sha1, const char *command, const char *refname, int flags) { struct strbuf arg = STRBUF_INIT; int ret = 0; if (*next == input->buf + input->len) goto eof; if (line_termination) { /* Without -z, consume SP and use next argument */ if (!**next || **next == line_termination) return 1; if (**next != ' ') die("%s %s: expected SP but got: %s", command, refname, *next); (*next)++; *next = parse_arg(*next, &arg); if (arg.len) { if (get_sha1(arg.buf, sha1)) goto invalid; } else { /* Without -z, an empty value means all zeros: */ hashclr(sha1); } } else { /* With -z, read the next NUL-terminated line */ if (**next) die("%s %s: expected NUL but got: %s", command, refname, *next); (*next)++; if (*next == input->buf + input->len) goto eof; strbuf_addstr(&arg, *next); *next += arg.len; if (arg.len) { if (get_sha1(arg.buf, sha1)) goto invalid; } else if (flags & PARSE_SHA1_ALLOW_EMPTY) { /* With -z, treat an empty value as all zeros: */ warning("%s %s: missing <newvalue>, treating as zero", command, refname); hashclr(sha1); } else { /* * With -z, an empty non-required value means * unspecified: */ ret = 1; } } strbuf_release(&arg); return ret; invalid: die(flags & PARSE_SHA1_OLD ? "%s %s: invalid <oldvalue>: %s" : "%s %s: invalid <newvalue>: %s", command, refname, arg.buf); eof: die(flags & PARSE_SHA1_OLD ? "%s %s: unexpected end of input when reading <oldvalue>" : "%s %s: unexpected end of input when reading <newvalue>", command, refname); } /* * The following five parse_cmd_*() functions parse the corresponding * command. In each case, next points at the character following the * command name and the following space. They each return a pointer * to the character terminating the command, and die with an * explanatory message if there are any parsing problems. All of * these functions handle either text or binary format input, * depending on how line_termination is set. */ static const char *parse_cmd_update(struct ref_transaction *transaction, struct strbuf *input, const char *next) { struct strbuf err = STRBUF_INIT; char *refname; unsigned char new_sha1[20]; unsigned char old_sha1[20]; int have_old; refname = parse_refname(input, &next); if (!refname) die("update: missing <ref>"); if (parse_next_sha1(input, &next, new_sha1, "update", refname, PARSE_SHA1_ALLOW_EMPTY)) die("update %s: missing <newvalue>", refname); have_old = !parse_next_sha1(input, &next, old_sha1, "update", refname, PARSE_SHA1_OLD); if (*next != line_termination) die("update %s: extra input: %s", refname, next); if (ref_transaction_update(transaction, refname, new_sha1, have_old ? old_sha1 : NULL, update_flags | create_reflog_flag, msg, &err)) die("%s", err.buf); update_flags = 0; free(refname); strbuf_release(&err); return next; } static const char *parse_cmd_create(struct ref_transaction *transaction, struct strbuf *input, const char *next) { struct strbuf err = STRBUF_INIT; char *refname; unsigned char new_sha1[20]; refname = parse_refname(input, &next); if (!refname) die("create: missing <ref>"); if (parse_next_sha1(input, &next, new_sha1, "create", refname, 0)) die("create %s: missing <newvalue>", refname); if (is_null_sha1(new_sha1)) die("create %s: zero <newvalue>", refname); if (*next != line_termination) die("create %s: extra input: %s", refname, next); if (ref_transaction_create(transaction, refname, new_sha1, update_flags | create_reflog_flag, msg, &err)) die("%s", err.buf); update_flags = 0; free(refname); strbuf_release(&err); return next; } static const char *parse_cmd_delete(struct ref_transaction *transaction, struct strbuf *input, const char *next) { struct strbuf err = STRBUF_INIT; char *refname; unsigned char old_sha1[20]; int have_old; refname = parse_refname(input, &next); if (!refname) die("delete: missing <ref>"); if (parse_next_sha1(input, &next, old_sha1, "delete", refname, PARSE_SHA1_OLD)) { have_old = 0; } else { if (is_null_sha1(old_sha1)) die("delete %s: zero <oldvalue>", refname); have_old = 1; } if (*next != line_termination) die("delete %s: extra input: %s", refname, next); if (ref_transaction_delete(transaction, refname, have_old ? old_sha1 : NULL, update_flags, msg, &err)) die("%s", err.buf); update_flags = 0; free(refname); strbuf_release(&err); return next; } static const char *parse_cmd_verify(struct ref_transaction *transaction, struct strbuf *input, const char *next) { struct strbuf err = STRBUF_INIT; char *refname; unsigned char old_sha1[20]; refname = parse_refname(input, &next); if (!refname) die("verify: missing <ref>"); if (parse_next_sha1(input, &next, old_sha1, "verify", refname, PARSE_SHA1_OLD)) hashclr(old_sha1); if (*next != line_termination) die("verify %s: extra input: %s", refname, next); if (ref_transaction_verify(transaction, refname, old_sha1, update_flags, &err)) die("%s", err.buf); update_flags = 0; free(refname); strbuf_release(&err); return next; } static const char *parse_cmd_option(struct strbuf *input, const char *next) { if (!strncmp(next, "no-deref", 8) && next[8] == line_termination) update_flags |= REF_NODEREF; else die("option unknown: %s", next); return next + 8; } static void update_refs_stdin(struct ref_transaction *transaction) { struct strbuf input = STRBUF_INIT; const char *next; if (strbuf_read(&input, 0, 1000) < 0) die_errno("could not read from stdin"); next = input.buf; /* Read each line dispatch its command */ while (next < input.buf + input.len) { if (*next == line_termination) die("empty command in input"); else if (isspace(*next)) die("whitespace before command: %s", next); else if (starts_with(next, "update ")) next = parse_cmd_update(transaction, &input, next + 7); else if (starts_with(next, "create ")) next = parse_cmd_create(transaction, &input, next + 7); else if (starts_with(next, "delete ")) next = parse_cmd_delete(transaction, &input, next + 7); else if (starts_with(next, "verify ")) next = parse_cmd_verify(transaction, &input, next + 7); else if (starts_with(next, "option ")) next = parse_cmd_option(&input, next + 7); else die("unknown command: %s", next); next++; } strbuf_release(&input); } int cmd_update_ref(int argc, const char **argv, const char *prefix) { const char *refname, *oldval; unsigned char sha1[20], oldsha1[20]; int delete = 0, no_deref = 0, read_stdin = 0, end_null = 0; unsigned int flags = 0; int create_reflog = 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_BOOL( 0 , "create-reflog", &create_reflog, N_("create a reflog")), 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."); create_reflog_flag = create_reflog ? REF_FORCE_CREATE_REFLOG : 0; if (read_stdin) { struct strbuf err = STRBUF_INIT; struct ref_transaction *transaction; transaction = ref_transaction_begin(&err); if (!transaction) die("%s", err.buf); if (delete || no_deref || argc > 0) usage_with_options(git_update_ref_usage, options); if (end_null) line_termination = '\0'; update_refs_stdin(transaction); if (ref_transaction_commit(transaction, &err)) die("%s", err.buf); ref_transaction_free(transaction); strbuf_release(&err); return 0; } 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); } if (oldval) { if (!*oldval) /* * The empty string implies that the reference * must not already exist: */ hashclr(oldsha1); else if (get_sha1(oldval, oldsha1)) die("%s: not a valid old SHA1", oldval); } if (no_deref) flags = REF_NODEREF; if (delete) /* * For purposes of backwards compatibility, we treat * NULL_SHA1 as "don't care" here: */ return delete_ref(refname, (oldval && !is_null_sha1(oldsha1)) ? oldsha1 : NULL, flags); else return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL, flags | create_reflog_flag, UPDATE_REFS_DIE_ON_ERR); }