diff options
Diffstat (limited to 'sha1_name.c')
| -rw-r--r-- | sha1_name.c | 276 |
1 files changed, 259 insertions, 17 deletions
diff --git a/sha1_name.c b/sha1_name.c index 7013c53..bf92417 100644 --- a/sha1_name.c +++ b/sha1_name.c @@ -5,6 +5,7 @@ #include "blob.h" #include "tree-walk.h" #include "refs.h" +#include "remote.h" static int find_short_object_filename(int len, const char *name, unsigned char *sha1) { @@ -240,7 +241,8 @@ static int ambiguous_path(const char *path, int len) /* * *string and *len will only be substituted, and *string returned (for - * later free()ing) if the string passed in is of the form @{-<n>}. + * later free()ing) if the string passed in is a magic short-hand form + * to name a branch. */ static char *substitute_branch_name(const char **string, int *len) { @@ -322,6 +324,20 @@ int dwim_log(const char *str, int len, unsigned char *sha1, char **log) return logs_found; } +static inline int upstream_mark(const char *string, int len) +{ + const char *suffix[] = { "@{upstream}", "@{u}" }; + int i; + + for (i = 0; i < ARRAY_SIZE(suffix); i++) { + int suffix_len = strlen(suffix[i]); + if (suffix_len <= len + && !memcmp(string, suffix[i], suffix_len)) + return suffix_len; + } + return 0; +} + static int get_sha1_1(const char *name, int len, unsigned char *sha1); static int get_sha1_basic(const char *str, int len, unsigned char *sha1) @@ -339,8 +355,10 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1) if (len && str[len-1] == '}') { for (at = len-2; at >= 0; at--) { if (str[at] == '@' && str[at+1] == '{') { - reflog_len = (len-1) - (at+2); - len = at; + if (!upstream_mark(str + at, len - at)) { + reflog_len = (len-1) - (at+2); + len = at; + } break; } } @@ -380,6 +398,10 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1) unsigned long co_time; int co_tz, co_cnt; + /* a @{-N} placed anywhere except the start is an error */ + if (str[at+2] == '-') + return -1; + /* Is it asking for N-th entry, or approxidate? */ for (i = nth = 0; 0 <= nth && i < reflog_len; i++) { char ch = str[at+2+i]; @@ -742,17 +764,10 @@ static int grab_nth_branch_switch(unsigned char *osha1, unsigned char *nsha1, } /* - * This reads "@{-N}" syntax, finds the name of the Nth previous - * branch we were on, and places the name of the branch in the given - * buf and returns the number of characters parsed if successful. - * - * If the input is not of the accepted format, it returns a negative - * number to signal an error. - * - * If the input was ok but there are not N branch switches in the - * reflog, it returns 0. + * Parse @{-N} syntax, return the number of characters parsed + * if successful; otherwise signal an error with negative value. */ -int interpret_branch_name(const char *name, struct strbuf *buf) +static int interpret_nth_prior_checkout(const char *name, struct strbuf *buf) { long nth; int i, retval; @@ -796,6 +811,122 @@ release_return: return retval; } +int get_sha1_mb(const char *name, unsigned char *sha1) +{ + struct commit *one, *two; + struct commit_list *mbs; + unsigned char sha1_tmp[20]; + const char *dots; + int st; + + dots = strstr(name, "..."); + if (!dots) + return get_sha1(name, sha1); + if (dots == name) + st = get_sha1("HEAD", sha1_tmp); + else { + struct strbuf sb; + strbuf_init(&sb, dots - name); + strbuf_add(&sb, name, dots - name); + st = get_sha1(sb.buf, sha1_tmp); + strbuf_release(&sb); + } + if (st) + return st; + one = lookup_commit_reference_gently(sha1_tmp, 0); + if (!one) + return -1; + + if (get_sha1(dots[3] ? (dots + 3) : "HEAD", sha1_tmp)) + return -1; + two = lookup_commit_reference_gently(sha1_tmp, 0); + if (!two) + return -1; + mbs = get_merge_bases(one, two, 1); + if (!mbs || mbs->next) + st = -1; + else { + st = 0; + hashcpy(sha1, mbs->item->object.sha1); + } + free_commit_list(mbs); + return st; +} + +/* + * This reads short-hand syntax that not only evaluates to a commit + * object name, but also can act as if the end user spelled the name + * of the branch from the command line. + * + * - "@{-N}" finds the name of the Nth previous branch we were on, and + * places the name of the branch in the given buf and returns the + * number of characters parsed if successful. + * + * - "<branch>@{upstream}" finds the name of the other ref that + * <branch> is configured to merge with (missing <branch> defaults + * to the current branch), and places the name of the branch in the + * given buf and returns the number of characters parsed if + * successful. + * + * If the input is not of the accepted format, it returns a negative + * number to signal an error. + * + * If the input was ok but there are not N branch switches in the + * reflog, it returns 0. + */ +int interpret_branch_name(const char *name, struct strbuf *buf) +{ + char *cp; + struct branch *upstream; + int namelen = strlen(name); + int len = interpret_nth_prior_checkout(name, buf); + int tmp_len; + + if (!len) + return len; /* syntax Ok, not enough switches */ + if (0 < len && len == namelen) + return len; /* consumed all */ + else if (0 < len) { + /* we have extra data, which might need further processing */ + struct strbuf tmp = STRBUF_INIT; + int used = buf->len; + int ret; + + strbuf_add(buf, name + len, namelen - len); + ret = interpret_branch_name(buf->buf, &tmp); + /* that data was not interpreted, remove our cruft */ + if (ret < 0) { + strbuf_setlen(buf, used); + return len; + } + strbuf_reset(buf); + strbuf_addbuf(buf, &tmp); + strbuf_release(&tmp); + /* tweak for size of {-N} versus expanded ref name */ + return ret - used + len; + } + + cp = strchr(name, '@'); + if (!cp) + return -1; + tmp_len = upstream_mark(cp, namelen - (cp - name)); + if (!tmp_len) + return -1; + len = cp + tmp_len - name; + cp = xstrndup(name, cp - name); + upstream = branch_get(*cp ? cp : NULL); + if (!upstream + || !upstream->merge + || !upstream->merge[0]->dst) + return error("No upstream branch found for '%s'", cp); + free(cp); + cp = shorten_unambiguous_ref(upstream->merge[0]->dst, 0); + strbuf_reset(buf); + strbuf_addstr(buf, cp); + free(cp); + return len; +} + /* * This is like "get_sha1_basic()", except it allows "sha1 expressions", * notably "xyz^" for "parent of xyz" @@ -806,7 +937,100 @@ int get_sha1(const char *name, unsigned char *sha1) return get_sha1_with_mode(name, sha1, &unused); } -int get_sha1_with_mode(const char *name, unsigned char *sha1, unsigned *mode) +/* Must be called only when object_name:filename doesn't exist. */ +static void diagnose_invalid_sha1_path(const char *prefix, + const char *filename, + const unsigned char *tree_sha1, + const char *object_name) +{ + struct stat st; + unsigned char sha1[20]; + unsigned mode; + + if (!prefix) + prefix = ""; + + if (!lstat(filename, &st)) + die("Path '%s' exists on disk, but not in '%s'.", + filename, object_name); + if (errno == ENOENT || errno == ENOTDIR) { + char *fullname = xmalloc(strlen(filename) + + strlen(prefix) + 1); + strcpy(fullname, prefix); + strcat(fullname, filename); + + if (!get_tree_entry(tree_sha1, fullname, + sha1, &mode)) { + die("Path '%s' exists, but not '%s'.\n" + "Did you mean '%s:%s'?", + fullname, + filename, + object_name, + fullname); + } + die("Path '%s' does not exist in '%s'", + filename, object_name); + } +} + +/* Must be called only when :stage:filename doesn't exist. */ +static void diagnose_invalid_index_path(int stage, + const char *prefix, + const char *filename) +{ + struct stat st; + struct cache_entry *ce; + int pos; + unsigned namelen = strlen(filename); + unsigned fullnamelen; + char *fullname; + + if (!prefix) + prefix = ""; + + /* Wrong stage number? */ + pos = cache_name_pos(filename, namelen); + if (pos < 0) + pos = -pos - 1; + if (pos < active_nr) { + ce = active_cache[pos]; + if (ce_namelen(ce) == namelen && + !memcmp(ce->name, filename, namelen)) + die("Path '%s' is in the index, but not at stage %d.\n" + "Did you mean ':%d:%s'?", + filename, stage, + ce_stage(ce), filename); + } + + /* Confusion between relative and absolute filenames? */ + fullnamelen = namelen + strlen(prefix); + fullname = xmalloc(fullnamelen + 1); + strcpy(fullname, prefix); + strcat(fullname, filename); + pos = cache_name_pos(fullname, fullnamelen); + if (pos < 0) + pos = -pos - 1; + if (pos < active_nr) { + ce = active_cache[pos]; + if (ce_namelen(ce) == fullnamelen && + !memcmp(ce->name, fullname, fullnamelen)) + die("Path '%s' is in the index, but not '%s'.\n" + "Did you mean ':%d:%s'?", + fullname, filename, + ce_stage(ce), fullname); + } + + if (!lstat(filename, &st)) + die("Path '%s' exists on disk, but not in the index.", filename); + if (errno == ENOENT || errno == ENOTDIR) + die("Path '%s' does not exist (neither on disk nor in the index).", + filename); + + free(fullname); +} + + +int get_sha1_with_mode_1(const char *name, unsigned char *sha1, unsigned *mode, int gently, const char *prefix) { int ret, bracket_depth; int namelen = strlen(name); @@ -852,6 +1076,8 @@ int get_sha1_with_mode(const char *name, unsigned char *sha1, unsigned *mode) } pos++; } + if (!gently) + diagnose_invalid_index_path(stage, prefix, cp); return -1; } for (cp = name, bracket_depth = 0; *cp; cp++) { @@ -864,9 +1090,25 @@ int get_sha1_with_mode(const char *name, unsigned char *sha1, unsigned *mode) } if (*cp == ':') { unsigned char tree_sha1[20]; - if (!get_sha1_1(name, cp-name, tree_sha1)) - return get_tree_entry(tree_sha1, cp+1, sha1, - mode); + char *object_name = NULL; + if (!gently) { + object_name = xmalloc(cp-name+1); + strncpy(object_name, name, cp-name); + object_name[cp-name] = '\0'; + } + if (!get_sha1_1(name, cp-name, tree_sha1)) { + const char *filename = cp+1; + ret = get_tree_entry(tree_sha1, filename, sha1, mode); + if (!gently) { + diagnose_invalid_sha1_path(prefix, filename, + tree_sha1, object_name); + free(object_name); + } + return ret; + } else { + if (!gently) + die("Invalid object name '%s'.", object_name); + } } return ret; } |