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https://github.com/git/git
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![Brandon Casey](/assets/img/avatar_default.png)
When core.ignorecase is true, the file globs configured in the .gitattributes file should be matched case-insensitively against the paths in the working directory. Let's do so. Plus, add some tests. The last set of tests is performed only on a case-insensitive filesystem. Those tests make sure that git handles the case where the .gitignore file resides in a subdirectory and the user supplies a path that does not match the case in the filesystem. In that case^H^H^H^Hsituation, part of the path supplied by the user is effectively interpreted case-insensitively, and part of it is dependent on the setting of core.ignorecase. git will currently only match the portion of the path below the directory holding the .gitignore file according to the setting of core.ignorecase. This is also partly future-proofing. Currently, git builds the attr stack based on the path supplied by the user, so we don't have to do anything special (like use strcmp_icase) to handle the parts of that path that don't match the filesystem with respect to case. If git instead built the attr stack by scanning the repository, then the paths in the origin field would not necessarily match the paths supplied by the user. If someone makes a change like that in the future, these tests will notice. Signed-off-by: Brandon Casey <drafnel@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
791 lines
18 KiB
C
791 lines
18 KiB
C
/*
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* Handle git attributes. See gitattributes(5) for a description of
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* the file syntax, and Documentation/technical/api-gitattributes.txt
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* for a description of the API.
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*
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* One basic design decision here is that we are not going to support
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* an insanely large number of attributes.
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*/
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#define NO_THE_INDEX_COMPATIBILITY_MACROS
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#include "cache.h"
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#include "exec_cmd.h"
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#include "attr.h"
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#include "dir.h"
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const char git_attr__true[] = "(builtin)true";
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const char git_attr__false[] = "\0(builtin)false";
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static const char git_attr__unknown[] = "(builtin)unknown";
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#define ATTR__TRUE git_attr__true
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#define ATTR__FALSE git_attr__false
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#define ATTR__UNSET NULL
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#define ATTR__UNKNOWN git_attr__unknown
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/* This is a randomly chosen prime. */
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#define HASHSIZE 257
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#ifndef DEBUG_ATTR
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#define DEBUG_ATTR 0
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#endif
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struct git_attr {
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struct git_attr *next;
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unsigned h;
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int attr_nr;
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char name[FLEX_ARRAY];
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};
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static int attr_nr;
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static struct git_attr_check *check_all_attr;
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static struct git_attr *(git_attr_hash[HASHSIZE]);
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char *git_attr_name(struct git_attr *attr)
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{
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return attr->name;
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}
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static unsigned hash_name(const char *name, int namelen)
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{
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unsigned val = 0, c;
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while (namelen--) {
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c = *name++;
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val = ((val << 7) | (val >> 22)) ^ c;
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}
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return val;
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}
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static int invalid_attr_name(const char *name, int namelen)
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{
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/*
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* Attribute name cannot begin with '-' and must consist of
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* characters from [-A-Za-z0-9_.].
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*/
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if (namelen <= 0 || *name == '-')
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return -1;
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while (namelen--) {
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char ch = *name++;
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if (! (ch == '-' || ch == '.' || ch == '_' ||
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('0' <= ch && ch <= '9') ||
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('a' <= ch && ch <= 'z') ||
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('A' <= ch && ch <= 'Z')) )
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return -1;
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}
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return 0;
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}
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static struct git_attr *git_attr_internal(const char *name, int len)
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{
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unsigned hval = hash_name(name, len);
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unsigned pos = hval % HASHSIZE;
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struct git_attr *a;
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for (a = git_attr_hash[pos]; a; a = a->next) {
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if (a->h == hval &&
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!memcmp(a->name, name, len) && !a->name[len])
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return a;
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}
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if (invalid_attr_name(name, len))
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return NULL;
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a = xmalloc(sizeof(*a) + len + 1);
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memcpy(a->name, name, len);
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a->name[len] = 0;
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a->h = hval;
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a->next = git_attr_hash[pos];
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a->attr_nr = attr_nr++;
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git_attr_hash[pos] = a;
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check_all_attr = xrealloc(check_all_attr,
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sizeof(*check_all_attr) * attr_nr);
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check_all_attr[a->attr_nr].attr = a;
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check_all_attr[a->attr_nr].value = ATTR__UNKNOWN;
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return a;
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}
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struct git_attr *git_attr(const char *name)
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{
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return git_attr_internal(name, strlen(name));
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}
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/* What does a matched pattern decide? */
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struct attr_state {
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struct git_attr *attr;
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const char *setto;
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};
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/*
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* One rule, as from a .gitattributes file.
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*
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* If is_macro is true, then u.attr is a pointer to the git_attr being
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* defined.
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*
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* If is_macro is false, then u.pattern points at the filename pattern
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* to which the rule applies. (The memory pointed to is part of the
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* memory block allocated for the match_attr instance.)
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*
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* In either case, num_attr is the number of attributes affected by
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* this rule, and state is an array listing them. The attributes are
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* listed as they appear in the file (macros unexpanded).
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*/
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struct match_attr {
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union {
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char *pattern;
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struct git_attr *attr;
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} u;
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char is_macro;
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unsigned num_attr;
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struct attr_state state[FLEX_ARRAY];
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};
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static const char blank[] = " \t\r\n";
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/*
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* Parse a whitespace-delimited attribute state (i.e., "attr",
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* "-attr", "!attr", or "attr=value") from the string starting at src.
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* If e is not NULL, write the results to *e. Return a pointer to the
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* remainder of the string (with leading whitespace removed), or NULL
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* if there was an error.
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*/
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static const char *parse_attr(const char *src, int lineno, const char *cp,
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struct attr_state *e)
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{
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const char *ep, *equals;
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int len;
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ep = cp + strcspn(cp, blank);
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equals = strchr(cp, '=');
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if (equals && ep < equals)
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equals = NULL;
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if (equals)
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len = equals - cp;
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else
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len = ep - cp;
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if (!e) {
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if (*cp == '-' || *cp == '!') {
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cp++;
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len--;
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}
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if (invalid_attr_name(cp, len)) {
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fprintf(stderr,
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"%.*s is not a valid attribute name: %s:%d\n",
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len, cp, src, lineno);
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return NULL;
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}
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} else {
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if (*cp == '-' || *cp == '!') {
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e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET;
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cp++;
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len--;
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}
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else if (!equals)
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e->setto = ATTR__TRUE;
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else {
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e->setto = xmemdupz(equals + 1, ep - equals - 1);
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}
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e->attr = git_attr_internal(cp, len);
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}
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return ep + strspn(ep, blank);
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}
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static struct match_attr *parse_attr_line(const char *line, const char *src,
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int lineno, int macro_ok)
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{
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int namelen;
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int num_attr, i;
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const char *cp, *name, *states;
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struct match_attr *res = NULL;
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int is_macro;
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cp = line + strspn(line, blank);
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if (!*cp || *cp == '#')
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return NULL;
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name = cp;
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namelen = strcspn(name, blank);
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if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen &&
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!prefixcmp(name, ATTRIBUTE_MACRO_PREFIX)) {
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if (!macro_ok) {
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fprintf(stderr, "%s not allowed: %s:%d\n",
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name, src, lineno);
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return NULL;
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}
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is_macro = 1;
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name += strlen(ATTRIBUTE_MACRO_PREFIX);
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name += strspn(name, blank);
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namelen = strcspn(name, blank);
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if (invalid_attr_name(name, namelen)) {
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fprintf(stderr,
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"%.*s is not a valid attribute name: %s:%d\n",
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namelen, name, src, lineno);
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return NULL;
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}
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}
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else
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is_macro = 0;
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states = name + namelen;
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states += strspn(states, blank);
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/* First pass to count the attr_states */
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for (cp = states, num_attr = 0; *cp; num_attr++) {
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cp = parse_attr(src, lineno, cp, NULL);
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if (!cp)
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return NULL;
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}
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res = xcalloc(1,
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sizeof(*res) +
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sizeof(struct attr_state) * num_attr +
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(is_macro ? 0 : namelen + 1));
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if (is_macro)
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res->u.attr = git_attr_internal(name, namelen);
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else {
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res->u.pattern = (char *)&(res->state[num_attr]);
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memcpy(res->u.pattern, name, namelen);
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res->u.pattern[namelen] = 0;
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}
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res->is_macro = is_macro;
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res->num_attr = num_attr;
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/* Second pass to fill the attr_states */
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for (cp = states, i = 0; *cp; i++) {
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cp = parse_attr(src, lineno, cp, &(res->state[i]));
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}
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return res;
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}
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/*
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* Like info/exclude and .gitignore, the attribute information can
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* come from many places.
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*
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* (1) .gitattribute file of the same directory;
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* (2) .gitattribute file of the parent directory if (1) does not have
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* any match; this goes recursively upwards, just like .gitignore.
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* (3) $GIT_DIR/info/attributes, which overrides both of the above.
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*
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* In the same file, later entries override the earlier match, so in the
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* global list, we would have entries from info/attributes the earliest
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* (reading the file from top to bottom), .gitattribute of the root
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* directory (again, reading the file from top to bottom) down to the
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* current directory, and then scan the list backwards to find the first match.
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* This is exactly the same as what excluded() does in dir.c to deal with
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* .gitignore
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*/
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static struct attr_stack {
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struct attr_stack *prev;
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char *origin;
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unsigned num_matches;
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unsigned alloc;
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struct match_attr **attrs;
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} *attr_stack;
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static void free_attr_elem(struct attr_stack *e)
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{
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int i;
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free(e->origin);
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for (i = 0; i < e->num_matches; i++) {
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struct match_attr *a = e->attrs[i];
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int j;
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for (j = 0; j < a->num_attr; j++) {
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const char *setto = a->state[j].setto;
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if (setto == ATTR__TRUE ||
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setto == ATTR__FALSE ||
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setto == ATTR__UNSET ||
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setto == ATTR__UNKNOWN)
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;
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else
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free((char *) setto);
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}
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free(a);
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}
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free(e);
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}
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static const char *builtin_attr[] = {
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"[attr]binary -diff -text",
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NULL,
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};
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static void handle_attr_line(struct attr_stack *res,
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const char *line,
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const char *src,
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int lineno,
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int macro_ok)
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{
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struct match_attr *a;
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a = parse_attr_line(line, src, lineno, macro_ok);
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if (!a)
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return;
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if (res->alloc <= res->num_matches) {
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res->alloc = alloc_nr(res->num_matches);
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res->attrs = xrealloc(res->attrs,
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sizeof(struct match_attr *) *
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res->alloc);
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}
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res->attrs[res->num_matches++] = a;
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}
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static struct attr_stack *read_attr_from_array(const char **list)
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{
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struct attr_stack *res;
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const char *line;
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int lineno = 0;
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res = xcalloc(1, sizeof(*res));
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while ((line = *(list++)) != NULL)
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handle_attr_line(res, line, "[builtin]", ++lineno, 1);
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return res;
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}
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static enum git_attr_direction direction;
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static struct index_state *use_index;
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static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
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{
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FILE *fp = fopen(path, "r");
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struct attr_stack *res;
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char buf[2048];
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int lineno = 0;
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if (!fp)
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return NULL;
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res = xcalloc(1, sizeof(*res));
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while (fgets(buf, sizeof(buf), fp))
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handle_attr_line(res, buf, path, ++lineno, macro_ok);
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fclose(fp);
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return res;
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}
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static void *read_index_data(const char *path)
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{
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int pos, len;
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unsigned long sz;
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enum object_type type;
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void *data;
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struct index_state *istate = use_index ? use_index : &the_index;
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len = strlen(path);
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pos = index_name_pos(istate, path, len);
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if (pos < 0) {
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/*
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* We might be in the middle of a merge, in which
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* case we would read stage #2 (ours).
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*/
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int i;
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for (i = -pos - 1;
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(pos < 0 && i < istate->cache_nr &&
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!strcmp(istate->cache[i]->name, path));
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i++)
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if (ce_stage(istate->cache[i]) == 2)
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pos = i;
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}
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if (pos < 0)
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return NULL;
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data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
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if (!data || type != OBJ_BLOB) {
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free(data);
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return NULL;
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}
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return data;
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}
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static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
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{
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struct attr_stack *res;
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char *buf, *sp;
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int lineno = 0;
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buf = read_index_data(path);
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if (!buf)
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return NULL;
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res = xcalloc(1, sizeof(*res));
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for (sp = buf; *sp; ) {
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char *ep;
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int more;
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for (ep = sp; *ep && *ep != '\n'; ep++)
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;
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more = (*ep == '\n');
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*ep = '\0';
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handle_attr_line(res, sp, path, ++lineno, macro_ok);
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sp = ep + more;
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}
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free(buf);
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return res;
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}
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static struct attr_stack *read_attr(const char *path, int macro_ok)
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{
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struct attr_stack *res;
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if (direction == GIT_ATTR_CHECKOUT) {
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res = read_attr_from_index(path, macro_ok);
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if (!res)
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res = read_attr_from_file(path, macro_ok);
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}
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else if (direction == GIT_ATTR_CHECKIN) {
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res = read_attr_from_file(path, macro_ok);
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if (!res)
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/*
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* There is no checked out .gitattributes file there, but
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* we might have it in the index. We allow operation in a
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* sparsely checked out work tree, so read from it.
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*/
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res = read_attr_from_index(path, macro_ok);
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}
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else
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res = read_attr_from_index(path, macro_ok);
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if (!res)
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res = xcalloc(1, sizeof(*res));
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return res;
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}
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#if DEBUG_ATTR
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static void debug_info(const char *what, struct attr_stack *elem)
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{
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fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()");
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}
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static void debug_set(const char *what, const char *match, struct git_attr *attr, const void *v)
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{
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const char *value = v;
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if (ATTR_TRUE(value))
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value = "set";
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else if (ATTR_FALSE(value))
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value = "unset";
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else if (ATTR_UNSET(value))
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value = "unspecified";
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fprintf(stderr, "%s: %s => %s (%s)\n",
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what, attr->name, (char *) value, match);
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}
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#define debug_push(a) debug_info("push", (a))
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#define debug_pop(a) debug_info("pop", (a))
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#else
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#define debug_push(a) do { ; } while (0)
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#define debug_pop(a) do { ; } while (0)
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#define debug_set(a,b,c,d) do { ; } while (0)
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#endif
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static void drop_attr_stack(void)
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{
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while (attr_stack) {
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struct attr_stack *elem = attr_stack;
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attr_stack = elem->prev;
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free_attr_elem(elem);
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}
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}
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static const char *git_etc_gitattributes(void)
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{
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static const char *system_wide;
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if (!system_wide)
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system_wide = system_path(ETC_GITATTRIBUTES);
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return system_wide;
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}
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static int git_attr_system(void)
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{
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return !git_env_bool("GIT_ATTR_NOSYSTEM", 0);
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}
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static void bootstrap_attr_stack(void)
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{
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if (!attr_stack) {
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struct attr_stack *elem;
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elem = read_attr_from_array(builtin_attr);
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elem->origin = NULL;
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elem->prev = attr_stack;
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attr_stack = elem;
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if (git_attr_system()) {
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elem = read_attr_from_file(git_etc_gitattributes(), 1);
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if (elem) {
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elem->origin = NULL;
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elem->prev = attr_stack;
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attr_stack = elem;
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}
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}
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if (git_attributes_file) {
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elem = read_attr_from_file(git_attributes_file, 1);
|
|
if (elem) {
|
|
elem->origin = NULL;
|
|
elem->prev = attr_stack;
|
|
attr_stack = elem;
|
|
}
|
|
}
|
|
|
|
if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
|
|
elem = read_attr(GITATTRIBUTES_FILE, 1);
|
|
elem->origin = xstrdup("");
|
|
elem->prev = attr_stack;
|
|
attr_stack = elem;
|
|
debug_push(elem);
|
|
}
|
|
|
|
elem = read_attr_from_file(git_path(INFOATTRIBUTES_FILE), 1);
|
|
if (!elem)
|
|
elem = xcalloc(1, sizeof(*elem));
|
|
elem->origin = NULL;
|
|
elem->prev = attr_stack;
|
|
attr_stack = elem;
|
|
}
|
|
}
|
|
|
|
static void prepare_attr_stack(const char *path)
|
|
{
|
|
struct attr_stack *elem, *info;
|
|
int dirlen, len;
|
|
const char *cp;
|
|
|
|
cp = strrchr(path, '/');
|
|
if (!cp)
|
|
dirlen = 0;
|
|
else
|
|
dirlen = cp - path;
|
|
|
|
/*
|
|
* At the bottom of the attribute stack is the built-in
|
|
* set of attribute definitions, followed by the contents
|
|
* of $(prefix)/etc/gitattributes and a file specified by
|
|
* core.attributesfile. Then, contents from
|
|
* .gitattribute files from directories closer to the
|
|
* root to the ones in deeper directories are pushed
|
|
* to the stack. Finally, at the very top of the stack
|
|
* we always keep the contents of $GIT_DIR/info/attributes.
|
|
*
|
|
* When checking, we use entries from near the top of the
|
|
* stack, preferring $GIT_DIR/info/attributes, then
|
|
* .gitattributes in deeper directories to shallower ones,
|
|
* and finally use the built-in set as the default.
|
|
*/
|
|
bootstrap_attr_stack();
|
|
|
|
/*
|
|
* Pop the "info" one that is always at the top of the stack.
|
|
*/
|
|
info = attr_stack;
|
|
attr_stack = info->prev;
|
|
|
|
/*
|
|
* Pop the ones from directories that are not the prefix of
|
|
* the path we are checking.
|
|
*/
|
|
while (attr_stack && attr_stack->origin) {
|
|
int namelen = strlen(attr_stack->origin);
|
|
|
|
elem = attr_stack;
|
|
if (namelen <= dirlen &&
|
|
!strncmp(elem->origin, path, namelen))
|
|
break;
|
|
|
|
debug_pop(elem);
|
|
attr_stack = elem->prev;
|
|
free_attr_elem(elem);
|
|
}
|
|
|
|
/*
|
|
* Read from parent directories and push them down
|
|
*/
|
|
if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
|
|
struct strbuf pathbuf = STRBUF_INIT;
|
|
|
|
while (1) {
|
|
len = strlen(attr_stack->origin);
|
|
if (dirlen <= len)
|
|
break;
|
|
cp = memchr(path + len + 1, '/', dirlen - len - 1);
|
|
if (!cp)
|
|
cp = path + dirlen;
|
|
strbuf_add(&pathbuf, path, cp - path);
|
|
strbuf_addch(&pathbuf, '/');
|
|
strbuf_addstr(&pathbuf, GITATTRIBUTES_FILE);
|
|
elem = read_attr(pathbuf.buf, 0);
|
|
strbuf_setlen(&pathbuf, cp - path);
|
|
elem->origin = strbuf_detach(&pathbuf, NULL);
|
|
elem->prev = attr_stack;
|
|
attr_stack = elem;
|
|
debug_push(elem);
|
|
}
|
|
|
|
strbuf_release(&pathbuf);
|
|
}
|
|
|
|
/*
|
|
* Finally push the "info" one at the top of the stack.
|
|
*/
|
|
info->prev = attr_stack;
|
|
attr_stack = info;
|
|
}
|
|
|
|
static int path_matches(const char *pathname, int pathlen,
|
|
const char *pattern,
|
|
const char *base, int baselen)
|
|
{
|
|
if (!strchr(pattern, '/')) {
|
|
/* match basename */
|
|
const char *basename = strrchr(pathname, '/');
|
|
basename = basename ? basename + 1 : pathname;
|
|
return (fnmatch_icase(pattern, basename, 0) == 0);
|
|
}
|
|
/*
|
|
* match with FNM_PATHNAME; the pattern has base implicitly
|
|
* in front of it.
|
|
*/
|
|
if (*pattern == '/')
|
|
pattern++;
|
|
if (pathlen < baselen ||
|
|
(baselen && pathname[baselen] != '/') ||
|
|
strncmp(pathname, base, baselen))
|
|
return 0;
|
|
if (baselen != 0)
|
|
baselen++;
|
|
return fnmatch_icase(pattern, pathname + baselen, FNM_PATHNAME) == 0;
|
|
}
|
|
|
|
static int macroexpand_one(int attr_nr, int rem);
|
|
|
|
static int fill_one(const char *what, struct match_attr *a, int rem)
|
|
{
|
|
struct git_attr_check *check = check_all_attr;
|
|
int i;
|
|
|
|
for (i = a->num_attr - 1; 0 < rem && 0 <= i; i--) {
|
|
struct git_attr *attr = a->state[i].attr;
|
|
const char **n = &(check[attr->attr_nr].value);
|
|
const char *v = a->state[i].setto;
|
|
|
|
if (*n == ATTR__UNKNOWN) {
|
|
debug_set(what,
|
|
a->is_macro ? a->u.attr->name : a->u.pattern,
|
|
attr, v);
|
|
*n = v;
|
|
rem--;
|
|
rem = macroexpand_one(attr->attr_nr, rem);
|
|
}
|
|
}
|
|
return rem;
|
|
}
|
|
|
|
static int fill(const char *path, int pathlen, struct attr_stack *stk, int rem)
|
|
{
|
|
int i;
|
|
const char *base = stk->origin ? stk->origin : "";
|
|
|
|
for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
|
|
struct match_attr *a = stk->attrs[i];
|
|
if (a->is_macro)
|
|
continue;
|
|
if (path_matches(path, pathlen,
|
|
a->u.pattern, base, strlen(base)))
|
|
rem = fill_one("fill", a, rem);
|
|
}
|
|
return rem;
|
|
}
|
|
|
|
static int macroexpand_one(int attr_nr, int rem)
|
|
{
|
|
struct attr_stack *stk;
|
|
struct match_attr *a = NULL;
|
|
int i;
|
|
|
|
if (check_all_attr[attr_nr].value != ATTR__TRUE)
|
|
return rem;
|
|
|
|
for (stk = attr_stack; !a && stk; stk = stk->prev)
|
|
for (i = stk->num_matches - 1; !a && 0 <= i; i--) {
|
|
struct match_attr *ma = stk->attrs[i];
|
|
if (!ma->is_macro)
|
|
continue;
|
|
if (ma->u.attr->attr_nr == attr_nr)
|
|
a = ma;
|
|
}
|
|
|
|
if (a)
|
|
rem = fill_one("expand", a, rem);
|
|
|
|
return rem;
|
|
}
|
|
|
|
/*
|
|
* Collect all attributes for path into the array pointed to by
|
|
* check_all_attr.
|
|
*/
|
|
static void collect_all_attrs(const char *path)
|
|
{
|
|
struct attr_stack *stk;
|
|
int i, pathlen, rem;
|
|
|
|
prepare_attr_stack(path);
|
|
for (i = 0; i < attr_nr; i++)
|
|
check_all_attr[i].value = ATTR__UNKNOWN;
|
|
|
|
pathlen = strlen(path);
|
|
rem = attr_nr;
|
|
for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
|
|
rem = fill(path, pathlen, stk, rem);
|
|
}
|
|
|
|
int git_check_attr(const char *path, int num, struct git_attr_check *check)
|
|
{
|
|
int i;
|
|
|
|
collect_all_attrs(path);
|
|
|
|
for (i = 0; i < num; i++) {
|
|
const char *value = check_all_attr[check[i].attr->attr_nr].value;
|
|
if (value == ATTR__UNKNOWN)
|
|
value = ATTR__UNSET;
|
|
check[i].value = value;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int git_all_attrs(const char *path, int *num, struct git_attr_check **check)
|
|
{
|
|
int i, count, j;
|
|
|
|
collect_all_attrs(path);
|
|
|
|
/* Count the number of attributes that are set. */
|
|
count = 0;
|
|
for (i = 0; i < attr_nr; i++) {
|
|
const char *value = check_all_attr[i].value;
|
|
if (value != ATTR__UNSET && value != ATTR__UNKNOWN)
|
|
++count;
|
|
}
|
|
*num = count;
|
|
*check = xmalloc(sizeof(**check) * count);
|
|
j = 0;
|
|
for (i = 0; i < attr_nr; i++) {
|
|
const char *value = check_all_attr[i].value;
|
|
if (value != ATTR__UNSET && value != ATTR__UNKNOWN) {
|
|
(*check)[j].attr = check_all_attr[i].attr;
|
|
(*check)[j].value = value;
|
|
++j;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void git_attr_set_direction(enum git_attr_direction new, struct index_state *istate)
|
|
{
|
|
enum git_attr_direction old = direction;
|
|
|
|
if (is_bare_repository() && new != GIT_ATTR_INDEX)
|
|
die("BUG: non-INDEX attr direction in a bare repo");
|
|
|
|
direction = new;
|
|
if (new != old)
|
|
drop_attr_stack();
|
|
use_index = istate;
|
|
}
|