diff options
Diffstat (limited to 'sha1_name.c')
| -rw-r--r-- | sha1_name.c | 130 |
1 files changed, 90 insertions, 40 deletions
diff --git a/sha1_name.c b/sha1_name.c index b3a90e6f05..90419efe10 100644 --- a/sha1_name.c +++ b/sha1_name.c @@ -431,22 +431,49 @@ static inline int upstream_mark(const char *string, int len) } static int get_sha1_1(const char *name, int len, unsigned char *sha1, unsigned lookup_flags); +static int interpret_nth_prior_checkout(const char *name, struct strbuf *buf); static int get_sha1_basic(const char *str, int len, unsigned char *sha1) { static const char *warn_msg = "refname '%.*s' is ambiguous."; + static const char *object_name_msg = N_( + "Git normally never creates a ref that ends with 40 hex characters\n" + "because it will be ignored when you just specify 40-hex. These refs\n" + "may be created by mistake. For example,\n" + "\n" + " git checkout -b $br $(git rev-parse ...)\n" + "\n" + "where \"$br\" is somehow empty and a 40-hex ref is created. Please\n" + "examine these refs and maybe delete them. Turn this message off by\n" + "running \"git config advice.object_name_warning false\""); + unsigned char tmp_sha1[20]; char *real_ref = NULL; int refs_found = 0; - int at, reflog_len; - - if (len == 40 && !get_sha1_hex(str, sha1)) + int at, reflog_len, nth_prior = 0; + + if (len == 40 && !get_sha1_hex(str, sha1)) { + refs_found = dwim_ref(str, len, tmp_sha1, &real_ref); + if (refs_found > 0 && warn_ambiguous_refs) { + warning(warn_msg, len, str); + if (advice_object_name_warning) + fprintf(stderr, "%s\n", _(object_name_msg)); + } + free(real_ref); return 0; + } /* basic@{time or number or -number} format to query ref-log */ reflog_len = at = 0; if (len && str[len-1] == '}') { - for (at = len-2; at >= 0; at--) { + for (at = len-4; at >= 0; at--) { if (str[at] == '@' && str[at+1] == '{') { + if (str[at+2] == '-') { + if (at != 0) + /* @{-N} not at start */ + return -1; + nth_prior = 1; + continue; + } if (!upstream_mark(str + at, len - at)) { reflog_len = (len-1) - (at+2); len = at; @@ -460,20 +487,22 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1) if (len && ambiguous_path(str, len)) return -1; - if (!len && reflog_len) { + if (nth_prior) { struct strbuf buf = STRBUF_INIT; - int ret; - /* try the @{-N} syntax for n-th checkout */ - ret = interpret_branch_name(str+at, &buf); - if (ret > 0) { - /* substitute this branch name and restart */ - return get_sha1_1(buf.buf, buf.len, sha1, 0); - } else if (ret == 0) { - return -1; + int detached; + + if (interpret_nth_prior_checkout(str, &buf) > 0) { + detached = (buf.len == 40 && !get_sha1_hex(buf.buf, sha1)); + strbuf_release(&buf); + if (detached) + return 0; } + } + + if (!len && reflog_len) /* allow "@{...}" to mean the current branch reflog */ refs_found = dwim_ref("HEAD", 4, sha1, &real_ref); - } else if (reflog_len) + else if (reflog_len) refs_found = dwim_log(str, len, sha1, &real_ref); else refs_found = dwim_ref(str, len, sha1, &real_ref); @@ -481,7 +510,9 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1) if (!refs_found) return -1; - if (warn_ambiguous_refs && refs_found > 1) + if (warn_ambiguous_refs && + (refs_found > 1 || + !get_short_sha1(str, len, tmp_sha1, GET_SHA1_QUIETLY))) warning(warn_msg, len, str); if (reflog_len) { @@ -490,10 +521,6 @@ 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]; @@ -975,6 +1002,38 @@ int get_sha1_mb(const char *name, unsigned char *sha1) return st; } +/* parse @something syntax, when 'something' is not {.*} */ +static int interpret_empty_at(const char *name, int namelen, int len, struct strbuf *buf) +{ + if (len || name[1] == '{') + return -1; + + strbuf_reset(buf); + strbuf_add(buf, "HEAD", 4); + return 1; +} + +static int reinterpret(const char *name, int namelen, int len, struct strbuf *buf) +{ + /* 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; +} + /* * 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 @@ -1004,36 +1063,27 @@ int interpret_branch_name(const char *name, struct strbuf *buf) int len = interpret_nth_prior_checkout(name, buf); int tmp_len; - if (!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; + } else if (len > 0) { + if (len == namelen) + return len; /* consumed all */ + else + return reinterpret(name, namelen, len, buf); } cp = strchr(name, '@'); if (!cp) return -1; + + len = interpret_empty_at(name, namelen, cp - name, buf); + if (len > 0) + return reinterpret(name, namelen, len, buf); + 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); |