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#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);
}
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