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