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-rw-r--r--refs.c2129
1 files changed, 2129 insertions, 0 deletions
diff --git a/refs.c b/refs.c
new file mode 100644
index 0000000..c9f6835
--- /dev/null
+++ b/refs.c
@@ -0,0 +1,2129 @@
+#include "cache.h"
+#include "refs.h"
+#include "object.h"
+#include "tag.h"
+#include "dir.h"
+
+/* ISSYMREF=0x01, ISPACKED=0x02 and ISBROKEN=0x04 are public interfaces */
+#define REF_KNOWS_PEELED 0x10
+
+struct ref_entry {
+ unsigned char flag; /* ISSYMREF? ISPACKED? */
+ unsigned char sha1[20];
+ unsigned char peeled[20];
+ /* The full name of the reference (e.g., "refs/heads/master"): */
+ char name[FLEX_ARRAY];
+};
+
+struct ref_array {
+ int nr, alloc;
+
+ /*
+ * Entries with index 0 <= i < sorted are sorted by name. New
+ * entries are appended to the list unsorted, and are sorted
+ * only when required; thus we avoid the need to sort the list
+ * after the addition of every reference.
+ */
+ int sorted;
+
+ struct ref_entry **refs;
+};
+
+/*
+ * Parse one line from a packed-refs file. Write the SHA1 to sha1.
+ * Return a pointer to the refname within the line (null-terminated),
+ * or NULL if there was a problem.
+ */
+static const char *parse_ref_line(char *line, unsigned char *sha1)
+{
+ /*
+ * 42: the answer to everything.
+ *
+ * In this case, it happens to be the answer to
+ * 40 (length of sha1 hex representation)
+ * +1 (space in between hex and name)
+ * +1 (newline at the end of the line)
+ */
+ int len = strlen(line) - 42;
+
+ if (len <= 0)
+ return NULL;
+ if (get_sha1_hex(line, sha1) < 0)
+ return NULL;
+ if (!isspace(line[40]))
+ return NULL;
+ line += 41;
+ if (isspace(*line))
+ return NULL;
+ if (line[len] != '\n')
+ return NULL;
+ line[len] = 0;
+
+ return line;
+}
+
+static struct ref_entry *create_ref_entry(const char *refname,
+ const unsigned char *sha1, int flag,
+ int check_name)
+{
+ int len;
+ struct ref_entry *ref;
+
+ if (check_name &&
+ check_refname_format(refname, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT))
+ die("Reference has invalid format: '%s'", refname);
+ len = strlen(refname) + 1;
+ ref = xmalloc(sizeof(struct ref_entry) + len);
+ hashcpy(ref->sha1, sha1);
+ hashclr(ref->peeled);
+ memcpy(ref->name, refname, len);
+ ref->flag = flag;
+ return ref;
+}
+
+/* Add a ref_entry to the end of the ref_array (unsorted). */
+static void add_ref(struct ref_array *refs, struct ref_entry *ref)
+{
+ ALLOC_GROW(refs->refs, refs->nr + 1, refs->alloc);
+ refs->refs[refs->nr++] = ref;
+}
+
+static int ref_entry_cmp(const void *a, const void *b)
+{
+ struct ref_entry *one = *(struct ref_entry **)a;
+ struct ref_entry *two = *(struct ref_entry **)b;
+ return strcmp(one->name, two->name);
+}
+
+/*
+ * Emit a warning and return true iff ref1 and ref2 have the same name
+ * and the same sha1. Die if they have the same name but different
+ * sha1s.
+ */
+static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2)
+{
+ if (!strcmp(ref1->name, ref2->name)) {
+ /* Duplicate name; make sure that the SHA1s match: */
+ if (hashcmp(ref1->sha1, ref2->sha1))
+ die("Duplicated ref, and SHA1s don't match: %s",
+ ref1->name);
+ warning("Duplicated ref: %s", ref1->name);
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+/*
+ * Sort the entries in array (if they are not already sorted).
+ */
+static void sort_ref_array(struct ref_array *array)
+{
+ int i, j;
+
+ /*
+ * This check also prevents passing a zero-length array to qsort(),
+ * which is a problem on some platforms.
+ */
+ if (array->sorted == array->nr)
+ return;
+
+ qsort(array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp);
+
+ /* Remove any duplicates from the ref_array */
+ i = 0;
+ for (j = 1; j < array->nr; j++) {
+ if (is_dup_ref(array->refs[i], array->refs[j])) {
+ free(array->refs[j]);
+ continue;
+ }
+ array->refs[++i] = array->refs[j];
+ }
+ array->sorted = array->nr = i + 1;
+}
+
+static struct ref_entry *search_ref_array(struct ref_array *array, const char *refname)
+{
+ struct ref_entry *e, **r;
+ int len;
+
+ if (refname == NULL)
+ return NULL;
+
+ if (!array->nr)
+ return NULL;
+ sort_ref_array(array);
+ len = strlen(refname) + 1;
+ e = xmalloc(sizeof(struct ref_entry) + len);
+ memcpy(e->name, refname, len);
+
+ r = bsearch(&e, array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp);
+
+ free(e);
+
+ if (r == NULL)
+ return NULL;
+
+ return *r;
+}
+
+/*
+ * Future: need to be in "struct repository"
+ * when doing a full libification.
+ */
+static struct ref_cache {
+ struct ref_cache *next;
+ char did_loose;
+ char did_packed;
+ struct ref_array loose;
+ struct ref_array packed;
+ /* The submodule name, or "" for the main repo. */
+ char name[FLEX_ARRAY];
+} *ref_cache;
+
+static struct ref_entry *current_ref;
+
+static void clear_ref_array(struct ref_array *array)
+{
+ int i;
+ for (i = 0; i < array->nr; i++)
+ free(array->refs[i]);
+ free(array->refs);
+ array->sorted = array->nr = array->alloc = 0;
+ array->refs = NULL;
+}
+
+static void clear_packed_ref_cache(struct ref_cache *refs)
+{
+ if (refs->did_packed)
+ clear_ref_array(&refs->packed);
+ refs->did_packed = 0;
+}
+
+static void clear_loose_ref_cache(struct ref_cache *refs)
+{
+ if (refs->did_loose)
+ clear_ref_array(&refs->loose);
+ refs->did_loose = 0;
+}
+
+static struct ref_cache *create_ref_cache(const char *submodule)
+{
+ int len;
+ struct ref_cache *refs;
+ if (!submodule)
+ submodule = "";
+ len = strlen(submodule) + 1;
+ refs = xcalloc(1, sizeof(struct ref_cache) + len);
+ memcpy(refs->name, submodule, len);
+ return refs;
+}
+
+/*
+ * Return a pointer to a ref_cache for the specified submodule. For
+ * the main repository, use submodule==NULL. The returned structure
+ * will be allocated and initialized but not necessarily populated; it
+ * should not be freed.
+ */
+static struct ref_cache *get_ref_cache(const char *submodule)
+{
+ struct ref_cache *refs = ref_cache;
+ if (!submodule)
+ submodule = "";
+ while (refs) {
+ if (!strcmp(submodule, refs->name))
+ return refs;
+ refs = refs->next;
+ }
+
+ refs = create_ref_cache(submodule);
+ refs->next = ref_cache;
+ ref_cache = refs;
+ return refs;
+}
+
+void invalidate_ref_cache(const char *submodule)
+{
+ struct ref_cache *refs = get_ref_cache(submodule);
+ clear_packed_ref_cache(refs);
+ clear_loose_ref_cache(refs);
+}
+
+static void read_packed_refs(FILE *f, struct ref_array *array)
+{
+ struct ref_entry *last = NULL;
+ char refline[PATH_MAX];
+ int flag = REF_ISPACKED;
+
+ while (fgets(refline, sizeof(refline), f)) {
+ unsigned char sha1[20];
+ const char *refname;
+ static const char header[] = "# pack-refs with:";
+
+ if (!strncmp(refline, header, sizeof(header)-1)) {
+ const char *traits = refline + sizeof(header) - 1;
+ if (strstr(traits, " peeled "))
+ flag |= REF_KNOWS_PEELED;
+ /* perhaps other traits later as well */
+ continue;
+ }
+
+ refname = parse_ref_line(refline, sha1);
+ if (refname) {
+ last = create_ref_entry(refname, sha1, flag, 1);
+ add_ref(array, last);
+ continue;
+ }
+ if (last &&
+ refline[0] == '^' &&
+ strlen(refline) == 42 &&
+ refline[41] == '\n' &&
+ !get_sha1_hex(refline + 1, sha1))
+ hashcpy(last->peeled, sha1);
+ }
+}
+
+static struct ref_array *get_packed_refs(struct ref_cache *refs)
+{
+ if (!refs->did_packed) {
+ const char *packed_refs_file;
+ FILE *f;
+
+ if (*refs->name)
+ packed_refs_file = git_path_submodule(refs->name, "packed-refs");
+ else
+ packed_refs_file = git_path("packed-refs");
+ f = fopen(packed_refs_file, "r");
+ if (f) {
+ read_packed_refs(f, &refs->packed);
+ fclose(f);
+ }
+ refs->did_packed = 1;
+ }
+ return &refs->packed;
+}
+
+void add_packed_ref(const char *refname, const unsigned char *sha1)
+{
+ add_ref(get_packed_refs(get_ref_cache(NULL)),
+ create_ref_entry(refname, sha1, REF_ISPACKED, 1));
+}
+
+static void get_ref_dir(struct ref_cache *refs, const char *base,
+ struct ref_array *array)
+{
+ DIR *dir;
+ const char *path;
+
+ if (*refs->name)
+ path = git_path_submodule(refs->name, "%s", base);
+ else
+ path = git_path("%s", base);
+
+
+ dir = opendir(path);
+
+ if (dir) {
+ struct dirent *de;
+ int baselen = strlen(base);
+ char *refname = xmalloc(baselen + 257);
+
+ memcpy(refname, base, baselen);
+ if (baselen && base[baselen-1] != '/')
+ refname[baselen++] = '/';
+
+ while ((de = readdir(dir)) != NULL) {
+ unsigned char sha1[20];
+ struct stat st;
+ int flag;
+ int namelen;
+ const char *refdir;
+
+ if (de->d_name[0] == '.')
+ continue;
+ namelen = strlen(de->d_name);
+ if (namelen > 255)
+ continue;
+ if (has_extension(de->d_name, ".lock"))
+ continue;
+ memcpy(refname + baselen, de->d_name, namelen+1);
+ refdir = *refs->name
+ ? git_path_submodule(refs->name, "%s", refname)
+ : git_path("%s", refname);
+ if (stat(refdir, &st) < 0)
+ continue;
+ if (S_ISDIR(st.st_mode)) {
+ get_ref_dir(refs, refname, array);
+ continue;
+ }
+ if (*refs->name) {
+ hashclr(sha1);
+ flag = 0;
+ if (resolve_gitlink_ref(refs->name, refname, sha1) < 0) {
+ hashclr(sha1);
+ flag |= REF_ISBROKEN;
+ }
+ } else if (read_ref_full(refname, sha1, 1, &flag)) {
+ hashclr(sha1);
+ flag |= REF_ISBROKEN;
+ }
+ add_ref(array, create_ref_entry(refname, sha1, flag, 1));
+ }
+ free(refname);
+ closedir(dir);
+ }
+}
+
+struct warn_if_dangling_data {
+ FILE *fp;
+ const char *refname;
+ const char *msg_fmt;
+};
+
+static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1,
+ int flags, void *cb_data)
+{
+ struct warn_if_dangling_data *d = cb_data;
+ const char *resolves_to;
+ unsigned char junk[20];
+
+ if (!(flags & REF_ISSYMREF))
+ return 0;
+
+ resolves_to = resolve_ref_unsafe(refname, junk, 0, NULL);
+ if (!resolves_to || strcmp(resolves_to, d->refname))
+ return 0;
+
+ fprintf(d->fp, d->msg_fmt, refname);
+ return 0;
+}
+
+void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
+{
+ struct warn_if_dangling_data data;
+
+ data.fp = fp;
+ data.refname = refname;
+ data.msg_fmt = msg_fmt;
+ for_each_rawref(warn_if_dangling_symref, &data);
+}
+
+static struct ref_array *get_loose_refs(struct ref_cache *refs)
+{
+ if (!refs->did_loose) {
+ get_ref_dir(refs, "refs", &refs->loose);
+ refs->did_loose = 1;
+ }
+ return &refs->loose;
+}
+
+/* We allow "recursive" symbolic refs. Only within reason, though */
+#define MAXDEPTH 5
+#define MAXREFLEN (1024)
+
+/*
+ * Called by resolve_gitlink_ref_recursive() after it failed to read
+ * from the loose refs in ref_cache refs. Find <refname> in the
+ * packed-refs file for the submodule.
+ */
+static int resolve_gitlink_packed_ref(struct ref_cache *refs,
+ const char *refname, unsigned char *sha1)
+{
+ struct ref_entry *ref;
+ struct ref_array *array = get_packed_refs(refs);
+
+ ref = search_ref_array(array, refname);
+ if (ref == NULL)
+ return -1;
+
+ memcpy(sha1, ref->sha1, 20);
+ return 0;
+}
+
+static int resolve_gitlink_ref_recursive(struct ref_cache *refs,
+ const char *refname, unsigned char *sha1,
+ int recursion)
+{
+ int fd, len;
+ char buffer[128], *p;
+ char *path;
+
+ if (recursion > MAXDEPTH || strlen(refname) > MAXREFLEN)
+ return -1;
+ path = *refs->name
+ ? git_path_submodule(refs->name, "%s", refname)
+ : git_path("%s", refname);
+ fd = open(path, O_RDONLY);
+ if (fd < 0)
+ return resolve_gitlink_packed_ref(refs, refname, sha1);
+
+ len = read(fd, buffer, sizeof(buffer)-1);
+ close(fd);
+ if (len < 0)
+ return -1;
+ while (len && isspace(buffer[len-1]))
+ len--;
+ buffer[len] = 0;
+
+ /* Was it a detached head or an old-fashioned symlink? */
+ if (!get_sha1_hex(buffer, sha1))
+ return 0;
+
+ /* Symref? */
+ if (strncmp(buffer, "ref:", 4))
+ return -1;
+ p = buffer + 4;
+ while (isspace(*p))
+ p++;
+
+ return resolve_gitlink_ref_recursive(refs, p, sha1, recursion+1);
+}
+
+int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1)
+{
+ int len = strlen(path), retval;
+ char *submodule;
+ struct ref_cache *refs;
+
+ while (len && path[len-1] == '/')
+ len--;
+ if (!len)
+ return -1;
+ submodule = xstrndup(path, len);
+ refs = get_ref_cache(submodule);
+ free(submodule);
+
+ retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0);
+ return retval;
+}
+
+/*
+ * Try to read ref from the packed references. On success, set sha1
+ * and return 0; otherwise, return -1.
+ */
+static int get_packed_ref(const char *refname, unsigned char *sha1)
+{
+ struct ref_array *packed = get_packed_refs(get_ref_cache(NULL));
+ struct ref_entry *entry = search_ref_array(packed, refname);
+ if (entry) {
+ hashcpy(sha1, entry->sha1);
+ return 0;
+ }
+ return -1;
+}
+
+const char *resolve_ref_unsafe(const char *refname, unsigned char *sha1, int reading, int *flag)
+{
+ int depth = MAXDEPTH;
+ ssize_t len;
+ char buffer[256];
+ static char refname_buffer[256];
+
+ if (flag)
+ *flag = 0;
+
+ if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
+ return NULL;
+
+ for (;;) {
+ char path[PATH_MAX];
+ struct stat st;
+ char *buf;
+ int fd;
+
+ if (--depth < 0)
+ return NULL;
+
+ git_snpath(path, sizeof(path), "%s", refname);
+
+ if (lstat(path, &st) < 0) {
+ if (errno != ENOENT)
+ return NULL;
+ /*
+ * The loose reference file does not exist;
+ * check for a packed reference.
+ */
+ if (!get_packed_ref(refname, sha1)) {
+ if (flag)
+ *flag |= REF_ISPACKED;
+ return refname;
+ }
+ /* The reference is not a packed reference, either. */
+ if (reading) {
+ return NULL;
+ } else {
+ hashclr(sha1);
+ return refname;
+ }
+ }
+
+ /* Follow "normalized" - ie "refs/.." symlinks by hand */
+ if (S_ISLNK(st.st_mode)) {
+ len = readlink(path, buffer, sizeof(buffer)-1);
+ if (len < 0)
+ return NULL;
+ buffer[len] = 0;
+ if (!prefixcmp(buffer, "refs/") &&
+ !check_refname_format(buffer, 0)) {
+ strcpy(refname_buffer, buffer);
+ refname = refname_buffer;
+ if (flag)
+ *flag |= REF_ISSYMREF;
+ continue;
+ }
+ }
+
+ /* Is it a directory? */
+ if (S_ISDIR(st.st_mode)) {
+ errno = EISDIR;
+ return NULL;
+ }
+
+ /*
+ * Anything else, just open it and try to use it as
+ * a ref
+ */
+ fd = open(path, O_RDONLY);
+ if (fd < 0)
+ return NULL;
+ len = read_in_full(fd, buffer, sizeof(buffer)-1);
+ close(fd);
+ if (len < 0)
+ return NULL;
+ while (len && isspace(buffer[len-1]))
+ len--;
+ buffer[len] = '\0';
+
+ /*
+ * Is it a symbolic ref?
+ */
+ if (prefixcmp(buffer, "ref:"))
+ break;
+ if (flag)
+ *flag |= REF_ISSYMREF;
+ buf = buffer + 4;
+ while (isspace(*buf))
+ buf++;
+ if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) {
+ if (flag)
+ *flag |= REF_ISBROKEN;
+ return NULL;
+ }
+ refname = strcpy(refname_buffer, buf);
+ }
+ /* Please note that FETCH_HEAD has a second line containing other data. */
+ if (get_sha1_hex(buffer, sha1) || (buffer[40] != '\0' && !isspace(buffer[40]))) {
+ if (flag)
+ *flag |= REF_ISBROKEN;
+ return NULL;
+ }
+ return refname;
+}
+
+char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag)
+{
+ const char *ret = resolve_ref_unsafe(ref, sha1, reading, flag);
+ return ret ? xstrdup(ret) : NULL;
+}
+
+/* The argument to filter_refs */
+struct ref_filter {
+ const char *pattern;
+ each_ref_fn *fn;
+ void *cb_data;
+};
+
+int read_ref_full(const char *refname, unsigned char *sha1, int reading, int *flags)
+{
+ if (resolve_ref_unsafe(refname, sha1, reading, flags))
+ return 0;
+ return -1;
+}
+
+int read_ref(const char *refname, unsigned char *sha1)
+{
+ return read_ref_full(refname, sha1, 1, NULL);
+}
+
+#define DO_FOR_EACH_INCLUDE_BROKEN 01
+static int do_one_ref(const char *base, each_ref_fn fn, int trim,
+ int flags, void *cb_data, struct ref_entry *entry)
+{
+ if (prefixcmp(entry->name, base))
+ return 0;
+
+ if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) {
+ if (entry->flag & REF_ISBROKEN)
+ return 0; /* ignore broken refs e.g. dangling symref */
+ if (!has_sha1_file(entry->sha1)) {
+ error("%s does not point to a valid object!", entry->name);
+ return 0;
+ }
+ }
+ current_ref = entry;
+ return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
+}
+
+static int filter_refs(const char *refname, const unsigned char *sha1, int flags,
+ void *data)
+{
+ struct ref_filter *filter = (struct ref_filter *)data;
+ if (fnmatch(filter->pattern, refname, 0))
+ return 0;
+ return filter->fn(refname, sha1, flags, filter->cb_data);
+}
+
+int peel_ref(const char *refname, unsigned char *sha1)
+{
+ int flag;
+ unsigned char base[20];
+ struct object *o;
+
+ if (current_ref && (current_ref->name == refname
+ || !strcmp(current_ref->name, refname))) {
+ if (current_ref->flag & REF_KNOWS_PEELED) {
+ hashcpy(sha1, current_ref->peeled);
+ return 0;
+ }
+ hashcpy(base, current_ref->sha1);
+ goto fallback;
+ }
+
+ if (read_ref_full(refname, base, 1, &flag))
+ return -1;
+
+ if ((flag & REF_ISPACKED)) {
+ struct ref_array *array = get_packed_refs(get_ref_cache(NULL));
+ struct ref_entry *r = search_ref_array(array, refname);
+
+ if (r != NULL && r->flag & REF_KNOWS_PEELED) {
+ hashcpy(sha1, r->peeled);
+ return 0;
+ }
+ }
+
+fallback:
+ o = parse_object(base);
+ if (o && o->type == OBJ_TAG) {
+ o = deref_tag(o, refname, 0);
+ if (o) {
+ hashcpy(sha1, o->sha1);
+ return 0;
+ }
+ }
+ return -1;
+}
+
+static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn,
+ int trim, int flags, void *cb_data)
+{
+ int retval = 0, p = 0, l = 0;
+ struct ref_cache *refs = get_ref_cache(submodule);
+ struct ref_array *packed = get_packed_refs(refs);
+ struct ref_array *loose = get_loose_refs(refs);
+
+ sort_ref_array(packed);
+ sort_ref_array(loose);
+ while (p < packed->nr && l < loose->nr) {
+ struct ref_entry *entry;
+ int cmp = strcmp(packed->refs[p]->name, loose->refs[l]->name);
+ if (!cmp) {
+ p++;
+ continue;
+ }
+ if (cmp > 0) {
+ entry = loose->refs[l++];
+ } else {
+ entry = packed->refs[p++];
+ }
+ retval = do_one_ref(base, fn, trim, flags, cb_data, entry);
+ if (retval)
+ goto end_each;
+ }
+
+ if (l < loose->nr) {
+ p = l;
+ packed = loose;
+ }
+
+ for (; p < packed->nr; p++) {
+ retval = do_one_ref(base, fn, trim, flags, cb_data, packed->refs[p]);
+ if (retval)
+ goto end_each;
+ }
+
+end_each:
+ current_ref = NULL;
+ return retval;
+}
+
+
+static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
+{
+ unsigned char sha1[20];
+ int flag;
+
+ if (submodule) {
+ if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0)
+ return fn("HEAD", sha1, 0, cb_data);
+
+ return 0;
+ }
+
+ if (!read_ref_full("HEAD", sha1, 1, &flag))
+ return fn("HEAD", sha1, flag, cb_data);
+
+ return 0;
+}
+
+int head_ref(each_ref_fn fn, void *cb_data)
+{
+ return do_head_ref(NULL, fn, cb_data);
+}
+
+int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
+{
+ return do_head_ref(submodule, fn, cb_data);
+}
+
+int for_each_ref(each_ref_fn fn, void *cb_data)
+{
+ return do_for_each_ref(NULL, "", fn, 0, 0, cb_data);
+}
+
+int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
+{
+ return do_for_each_ref(submodule, "", fn, 0, 0, cb_data);
+}
+
+int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
+{
+ return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data);
+}
+
+int for_each_ref_in_submodule(const char *submodule, const char *prefix,
+ each_ref_fn fn, void *cb_data)
+{
+ return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data);
+}
+
+int for_each_tag_ref(each_ref_fn fn, void *cb_data)
+{
+ return for_each_ref_in("refs/tags/", fn, cb_data);
+}
+
+int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
+{
+ return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data);
+}
+
+int for_each_branch_ref(each_ref_fn fn, void *cb_data)
+{
+ return for_each_ref_in("refs/heads/", fn, cb_data);
+}
+
+int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
+{
+ return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data);
+}
+
+int for_each_remote_ref(each_ref_fn fn, void *cb_data)
+{
+ return for_each_ref_in("refs/remotes/", fn, cb_data);
+}
+
+int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
+{
+ return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
+}
+
+int for_each_replace_ref(each_ref_fn fn, void *cb_data)
+{
+ return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data);
+}
+
+int head_ref_namespaced(each_ref_fn fn, void *cb_data)
+{
+ struct strbuf buf = STRBUF_INIT;
+ int ret = 0;
+ unsigned char sha1[20];
+ int flag;
+
+ strbuf_addf(&buf, "%sHEAD", get_git_namespace());
+ if (!read_ref_full(buf.buf, sha1, 1, &flag))
+ ret = fn(buf.buf, sha1, flag, cb_data);
+ strbuf_release(&buf);
+
+ return ret;
+}
+
+int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
+{
+ struct strbuf buf = STRBUF_INIT;
+ int ret;
+ strbuf_addf(&buf, "%srefs/", get_git_namespace());
+ ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data);
+ strbuf_release(&buf);
+ return ret;
+}
+
+int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
+ const char *prefix, void *cb_data)
+{
+ struct strbuf real_pattern = STRBUF_INIT;
+ struct ref_filter filter;
+ int ret;
+
+ if (!prefix && prefixcmp(pattern, "refs/"))
+ strbuf_addstr(&real_pattern, "refs/");
+ else if (prefix)
+ strbuf_addstr(&real_pattern, prefix);
+ strbuf_addstr(&real_pattern, pattern);
+
+ if (!has_glob_specials(pattern)) {
+ /* Append implied '/' '*' if not present. */
+ if (real_pattern.buf[real_pattern.len - 1] != '/')
+ strbuf_addch(&real_pattern, '/');
+ /* No need to check for '*', there is none. */
+ strbuf_addch(&real_pattern, '*');
+ }
+
+ filter.pattern = real_pattern.buf;
+ filter.fn = fn;
+ filter.cb_data = cb_data;
+ ret = for_each_ref(filter_refs, &filter);
+
+ strbuf_release(&real_pattern);
+ return ret;
+}
+
+int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
+{
+ return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
+}
+
+int for_each_rawref(each_ref_fn fn, void *cb_data)
+{
+ return do_for_each_ref(NULL, "", fn, 0,
+ DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
+}
+
+/*
+ * Make sure "ref" is something reasonable to have under ".git/refs/";
+ * We do not like it if:
+ *
+ * - any path component of it begins with ".", or
+ * - it has double dots "..", or
+ * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
+ * - it ends with a "/".
+ * - it ends with ".lock"
+ * - it contains a "\" (backslash)
+ */
+
+/* Return true iff ch is not allowed in reference names. */
+static inline int bad_ref_char(int ch)
+{
+ if (((unsigned) ch) <= ' ' || ch == 0x7f ||
+ ch == '~' || ch == '^' || ch == ':' || ch == '\\')
+ return 1;
+ /* 2.13 Pattern Matching Notation */
+ if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */
+ return 1;
+ return 0;
+}
+
+/*
+ * Try to read one refname component from the front of refname. Return
+ * the length of the component found, or -1 if the component is not
+ * legal.
+ */
+static int check_refname_component(const char *refname, int flags)
+{
+ const char *cp;
+ char last = '\0';
+
+ for (cp = refname; ; cp++) {
+ char ch = *cp;
+ if (ch == '\0' || ch == '/')
+ break;
+ if (bad_ref_char(ch))
+ return -1; /* Illegal character in refname. */
+ if (last == '.' && ch == '.')
+ return -1; /* Refname contains "..". */
+ if (last == '@' && ch == '{')
+ return -1; /* Refname contains "@{". */
+ last = ch;
+ }
+ if (cp == refname)
+ return -1; /* Component has zero length. */
+ if (refname[0] == '.') {
+ if (!(flags & REFNAME_DOT_COMPONENT))
+ return -1; /* Component starts with '.'. */
+ /*
+ * Even if leading dots are allowed, don't allow "."
+ * as a component (".." is prevented by a rule above).
+ */
+ if (refname[1] == '\0')
+ return -1; /* Component equals ".". */
+ }
+ if (cp - refname >= 5 && !memcmp(cp - 5, ".lock", 5))
+ return -1; /* Refname ends with ".lock". */
+ return cp - refname;
+}
+
+int check_refname_format(const char *refname, int flags)
+{
+ int component_len, component_count = 0;
+
+ while (1) {
+ /* We are at the start of a path component. */
+ component_len = check_refname_component(refname, flags);
+ if (component_len < 0) {
+ if ((flags & REFNAME_REFSPEC_PATTERN) &&
+ refname[0] == '*' &&
+ (refname[1] == '\0' || refname[1] == '/')) {
+ /* Accept one wildcard as a full refname component. */
+ flags &= ~REFNAME_REFSPEC_PATTERN;
+ component_len = 1;
+ } else {
+ return -1;
+ }
+ }
+ component_count++;
+ if (refname[component_len] == '\0')
+ break;
+ /* Skip to next component. */
+ refname += component_len + 1;
+ }
+
+ if (refname[component_len - 1] == '.')
+ return -1; /* Refname ends with '.'. */
+ if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2)
+ return -1; /* Refname has only one component. */
+ return 0;
+}
+
+const char *prettify_refname(const char *name)
+{
+ return name + (
+ !prefixcmp(name, "refs/heads/") ? 11 :
+ !prefixcmp(name, "refs/tags/") ? 10 :
+ !prefixcmp(name, "refs/remotes/") ? 13 :
+ 0);
+}
+
+const char *ref_rev_parse_rules[] = {
+ "%.*s",
+ "refs/%.*s",
+ "refs/tags/%.*s",
+ "refs/heads/%.*s",
+ "refs/remotes/%.*s",
+ "refs/remotes/%.*s/HEAD",
+ NULL
+};
+
+int refname_match(const char *abbrev_name, const char *full_name, const char **rules)
+{
+ const char **p;
+ const int abbrev_name_len = strlen(abbrev_name);
+
+ for (p = rules; *p; p++) {
+ if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+static struct ref_lock *verify_lock(struct ref_lock *lock,
+ const unsigned char *old_sha1, int mustexist)
+{
+ if (read_ref_full(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
+ error("Can't verify ref %s", lock->ref_name);
+ unlock_ref(lock);
+ return NULL;
+ }
+ if (hashcmp(lock->old_sha1, old_sha1)) {
+ error("Ref %s is at %s but expected %s", lock->ref_name,
+ sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
+ unlock_ref(lock);
+ return NULL;
+ }
+ return lock;
+}
+
+static int remove_empty_directories(const char *file)
+{
+ /* we want to create a file but there is a directory there;
+ * if that is an empty directory (or a directory that contains
+ * only empty directories), remove them.
+ */
+ struct strbuf path;
+ int result;
+
+ strbuf_init(&path, 20);
+ strbuf_addstr(&path, file);
+
+ result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY);
+
+ strbuf_release(&path);
+
+ return result;
+}
+
+/*
+ * Return true iff a reference named refname could be created without
+ * conflicting with the name of an existing reference. If oldrefname
+ * is non-NULL, ignore potential conflicts with oldrefname (e.g.,
+ * because oldrefname is scheduled for deletion in the same
+ * operation).
+ */
+static int is_refname_available(const char *refname, const char *oldrefname,
+ struct ref_array *array)
+{
+ int i, namlen = strlen(refname); /* e.g. 'foo/bar' */
+ for (i = 0; i < array->nr; i++ ) {
+ struct ref_entry *entry = array->refs[i];
+ /* entry->name could be 'foo' or 'foo/bar/baz' */
+ if (!oldrefname || strcmp(oldrefname, entry->name)) {
+ int len = strlen(entry->name);
+ int cmplen = (namlen < len) ? namlen : len;
+ const char *lead = (namlen < len) ? entry->name : refname;
+ if (!strncmp(refname, entry->name, cmplen) &&
+ lead[cmplen] == '/') {
+ error("'%s' exists; cannot create '%s'",
+ entry->name, refname);
+ return 0;
+ }
+ }
+ }
+ return 1;
+}
+
+/*
+ * *string and *len will only be substituted, and *string returned (for
+ * 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)
+{
+ struct strbuf buf = STRBUF_INIT;
+ int ret = interpret_branch_name(*string, &buf);
+
+ if (ret == *len) {
+ size_t size;
+ *string = strbuf_detach(&buf, &size);
+ *len = size;
+ return (char *)*string;
+ }
+
+ return NULL;
+}
+
+int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
+{
+ char *last_branch = substitute_branch_name(&str, &len);
+ const char **p, *r;
+ int refs_found = 0;
+
+ *ref = NULL;
+ for (p = ref_rev_parse_rules; *p; p++) {
+ char fullref[PATH_MAX];
+ unsigned char sha1_from_ref[20];
+ unsigned char *this_result;
+ int flag;
+
+ this_result = refs_found ? sha1_from_ref : sha1;
+ mksnpath(fullref, sizeof(fullref), *p, len, str);
+ r = resolve_ref_unsafe(fullref, this_result, 1, &flag);
+ if (r) {
+ if (!refs_found++)
+ *ref = xstrdup(r);
+ if (!warn_ambiguous_refs)
+ break;
+ } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) {
+ warning("ignoring dangling symref %s.", fullref);
+ } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) {
+ warning("ignoring broken ref %s.", fullref);
+ }
+ }
+ free(last_branch);
+ return refs_found;
+}
+
+int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
+{
+ char *last_branch = substitute_branch_name(&str, &len);
+ const char **p;
+ int logs_found = 0;
+
+ *log = NULL;
+ for (p = ref_rev_parse_rules; *p; p++) {
+ struct stat st;
+ unsigned char hash[20];
+ char path[PATH_MAX];
+ const char *ref, *it;
+
+ mksnpath(path, sizeof(path), *p, len, str);
+ ref = resolve_ref_unsafe(path, hash, 1, NULL);
+ if (!ref)
+ continue;
+ if (!stat(git_path("logs/%s", path), &st) &&
+ S_ISREG(st.st_mode))
+ it = path;
+ else if (strcmp(ref, path) &&
+ !stat(git_path("logs/%s", ref), &st) &&
+ S_ISREG(st.st_mode))
+ it = ref;
+ else
+ continue;
+ if (!logs_found++) {
+ *log = xstrdup(it);
+ hashcpy(sha1, hash);
+ }
+ if (!warn_ambiguous_refs)
+ break;
+ }
+ free(last_branch);
+ return logs_found;
+}
+
+static struct ref_lock *lock_ref_sha1_basic(const char *refname,
+ const unsigned char *old_sha1,
+ int flags, int *type_p)
+{
+ char *ref_file;
+ const char *orig_refname = refname;
+ struct ref_lock *lock;
+ int last_errno = 0;
+ int type, lflags;
+ int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
+ int missing = 0;
+
+ lock = xcalloc(1, sizeof(struct ref_lock));
+ lock->lock_fd = -1;
+
+ refname = resolve_ref_unsafe(refname, lock->old_sha1, mustexist, &type);
+ if (!refname && errno == EISDIR) {
+ /* we are trying to lock foo but we used to
+ * have foo/bar which now does not exist;
+ * it is normal for the empty directory 'foo'
+ * to remain.
+ */
+ ref_file = git_path("%s", orig_refname);
+ if (remove_empty_directories(ref_file)) {
+ last_errno = errno;
+ error("there are still refs under '%s'", orig_refname);
+ goto error_return;
+ }
+ refname = resolve_ref_unsafe(orig_refname, lock->old_sha1, mustexist, &type);
+ }
+ if (type_p)
+ *type_p = type;
+ if (!refname) {
+ last_errno = errno;
+ error("unable to resolve reference %s: %s",
+ orig_refname, strerror(errno));
+ goto error_return;
+ }
+ missing = is_null_sha1(lock->old_sha1);
+ /* When the ref did not exist and we are creating it,
+ * make sure there is no existing ref that is packed
+ * whose name begins with our refname, nor a ref whose
+ * name is a proper prefix of our refname.
+ */
+ if (missing &&
+ !is_refname_available(refname, NULL, get_packed_refs(get_ref_cache(NULL)))) {
+ last_errno = ENOTDIR;
+ goto error_return;
+ }
+
+ lock->lk = xcalloc(1, sizeof(struct lock_file));
+
+ lflags = LOCK_DIE_ON_ERROR;
+ if (flags & REF_NODEREF) {
+ refname = orig_refname;
+ lflags |= LOCK_NODEREF;
+ }
+ lock->ref_name = xstrdup(refname);
+ lock->orig_ref_name = xstrdup(orig_refname);
+ ref_file = git_path("%s", refname);
+ if (missing)
+ lock->force_write = 1;
+ if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
+ lock->force_write = 1;
+
+ if (safe_create_leading_directories(ref_file)) {
+ last_errno = errno;
+ error("unable to create directory for %s", ref_file);
+ goto error_return;
+ }
+
+ lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
+ return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
+
+ error_return:
+ unlock_ref(lock);
+ errno = last_errno;
+ return NULL;
+}
+
+struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1)
+{
+ char refpath[PATH_MAX];
+ if (check_refname_format(refname, 0))
+ return NULL;
+ strcpy(refpath, mkpath("refs/%s", refname));
+ return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
+}
+
+struct ref_lock *lock_any_ref_for_update(const char *refname,
+ const unsigned char *old_sha1, int flags)
+{
+ if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
+ return NULL;
+ return lock_ref_sha1_basic(refname, old_sha1, flags, NULL);
+}
+
+static struct lock_file packlock;
+
+static int repack_without_ref(const char *refname)
+{
+ struct ref_array *packed;
+ int fd, i;
+
+ packed = get_packed_refs(get_ref_cache(NULL));
+ if (search_ref_array(packed, refname) == NULL)
+ return 0;
+ fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
+ if (fd < 0) {
+ unable_to_lock_error(git_path("packed-refs"), errno);
+ return error("cannot delete '%s' from packed refs", refname);
+ }
+
+ for (i = 0; i < packed->nr; i++) {
+ char line[PATH_MAX + 100];
+ int len;
+ struct ref_entry *ref = packed->refs[i];
+
+ if (!strcmp(refname, ref->name))
+ continue;
+ len = snprintf(line, sizeof(line), "%s %s\n",
+ sha1_to_hex(ref->sha1), ref->name);
+ /* this should not happen but just being defensive */
+ if (len > sizeof(line))
+ die("too long a refname '%s'", ref->name);
+ write_or_die(fd, line, len);
+ }
+ return commit_lock_file(&packlock);
+}
+
+int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
+{
+ struct ref_lock *lock;
+ int err, i = 0, ret = 0, flag = 0;
+
+ lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
+ if (!lock)
+ return 1;
+ if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
+ /* loose */
+ const char *path;
+
+ if (!(delopt & REF_NODEREF)) {
+ i = strlen(lock->lk->filename) - 5; /* .lock */
+ lock->lk->filename[i] = 0;
+ path = lock->lk->filename;
+ } else {
+ path = git_path("%s", refname);
+ }
+ err = unlink_or_warn(path);
+ if (err && errno != ENOENT)
+ ret = 1;
+
+ if (!(delopt & REF_NODEREF))
+ lock->lk->filename[i] = '.';
+ }
+ /* removing the loose one could have resurrected an earlier
+ * packed one. Also, if it was not loose we need to repack
+ * without it.
+ */
+ ret |= repack_without_ref(refname);
+
+ unlink_or_warn(git_path("logs/%s", lock->ref_name));
+ invalidate_ref_cache(NULL);
+ unlock_ref(lock);
+ return ret;
+}
+
+/*
+ * People using contrib's git-new-workdir have .git/logs/refs ->
+ * /some/other/path/.git/logs/refs, and that may live on another device.
+ *
+ * IOW, to avoid cross device rename errors, the temporary renamed log must
+ * live into logs/refs.
+ */
+#define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
+
+int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg)
+{
+ unsigned char sha1[20], orig_sha1[20];
+ int flag = 0, logmoved = 0;
+ struct ref_lock *lock;
+ struct stat loginfo;
+ int log = !lstat(git_path("logs/%s", oldrefname), &loginfo);
+ const char *symref = NULL;
+ struct ref_cache *refs = get_ref_cache(NULL);
+
+ if (log && S_ISLNK(loginfo.st_mode))
+ return error("reflog for %s is a symlink", oldrefname);
+
+ symref = resolve_ref_unsafe(oldrefname, orig_sha1, 1, &flag);
+ if (flag & REF_ISSYMREF)
+ return error("refname %s is a symbolic ref, renaming it is not supported",
+ oldrefname);
+ if (!symref)
+ return error("refname %s not found", oldrefname);
+
+ if (!is_refname_available(newrefname, oldrefname, get_packed_refs(refs)))
+ return 1;
+
+ if (!is_refname_available(newrefname, oldrefname, get_loose_refs(refs)))
+ return 1;
+
+ if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG)))
+ return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
+ oldrefname, strerror(errno));
+
+ if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) {
+ error("unable to delete old %s", oldrefname);
+ goto rollback;
+ }
+
+ if (!read_ref_full(newrefname, sha1, 1, &flag) &&
+ delete_ref(newrefname, sha1, REF_NODEREF)) {
+ if (errno==EISDIR) {
+ if (remove_empty_directories(git_path("%s", newrefname))) {
+ error("Directory not empty: %s", newrefname);
+ goto rollback;
+ }
+ } else {
+ error("unable to delete existing %s", newrefname);
+ goto rollback;
+ }
+ }
+
+ if (log && safe_create_leading_directories(git_path("logs/%s", newrefname))) {
+ error("unable to create directory for %s", newrefname);
+ goto rollback;
+ }
+
+ retry:
+ if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) {
+ if (errno==EISDIR || errno==ENOTDIR) {
+ /*
+ * rename(a, b) when b is an existing
+ * directory ought to result in ISDIR, but
+ * Solaris 5.8 gives ENOTDIR. Sheesh.
+ */
+ if (remove_empty_directories(git_path("logs/%s", newrefname))) {
+ error("Directory not empty: logs/%s", newrefname);
+ goto rollback;
+ }
+ goto retry;
+ } else {
+ error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
+ newrefname, strerror(errno));
+ goto rollback;
+ }
+ }
+ logmoved = log;
+
+ lock = lock_ref_sha1_basic(newrefname, NULL, 0, NULL);
+ if (!lock) {
+ error("unable to lock %s for update", newrefname);
+ goto rollback;
+ }
+ lock->force_write = 1;
+ hashcpy(lock->old_sha1, orig_sha1);
+ if (write_ref_sha1(lock, orig_sha1, logmsg)) {
+ error("unable to write current sha1 into %s", newrefname);
+ goto rollback;
+ }
+
+ return 0;
+
+ rollback:
+ lock = lock_ref_sha1_basic(oldrefname, NULL, 0, NULL);
+ if (!lock) {
+ error("unable to lock %s for rollback", oldrefname);
+ goto rollbacklog;
+ }
+
+ lock->force_write = 1;
+ flag = log_all_ref_updates;
+ log_all_ref_updates = 0;
+ if (write_ref_sha1(lock, orig_sha1, NULL))
+ error("unable to write current sha1 into %s", oldrefname);
+ log_all_ref_updates = flag;
+
+ rollbacklog:
+ if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname)))
+ error("unable to restore logfile %s from %s: %s",
+ oldrefname, newrefname, strerror(errno));
+ if (!logmoved && log &&
+ rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname)))
+ error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
+ oldrefname, strerror(errno));
+
+ return 1;
+}
+
+int close_ref(struct ref_lock *lock)
+{
+ if (close_lock_file(lock->lk))
+ return -1;
+ lock->lock_fd = -1;
+ return 0;
+}
+
+int commit_ref(struct ref_lock *lock)
+{
+ if (commit_lock_file(lock->lk))
+ return -1;
+ lock->lock_fd = -1;
+ return 0;
+}
+
+void unlock_ref(struct ref_lock *lock)
+{
+ /* Do not free lock->lk -- atexit() still looks at them */
+ if (lock->lk)
+ rollback_lock_file(lock->lk);
+ free(lock->ref_name);
+ free(lock->orig_ref_name);
+ free(lock);
+}
+
+/*
+ * copy the reflog message msg to buf, which has been allocated sufficiently
+ * large, while cleaning up the whitespaces. Especially, convert LF to space,
+ * because reflog file is one line per entry.
+ */
+static int copy_msg(char *buf, const char *msg)
+{
+ char *cp = buf;
+ char c;
+ int wasspace = 1;
+
+ *cp++ = '\t';
+ while ((c = *msg++)) {
+ if (wasspace && isspace(c))
+ continue;
+ wasspace = isspace(c);
+ if (wasspace)
+ c = ' ';
+ *cp++ = c;
+ }
+ while (buf < cp && isspace(cp[-1]))
+ cp--;
+ *cp++ = '\n';
+ return cp - buf;
+}
+
+int log_ref_setup(const char *refname, char *logfile, int bufsize)
+{
+ int logfd, oflags = O_APPEND | O_WRONLY;
+
+ git_snpath(logfile, bufsize, "logs/%s", refname);
+ if (log_all_ref_updates &&
+ (!prefixcmp(refname, "refs/heads/") ||
+ !prefixcmp(refname, "refs/remotes/") ||
+ !prefixcmp(refname, "refs/notes/") ||
+ !strcmp(refname, "HEAD"))) {
+ if (safe_create_leading_directories(logfile) < 0)
+ return error("unable to create directory for %s",
+ logfile);
+ oflags |= O_CREAT;
+ }
+
+ logfd = open(logfile, oflags, 0666);
+ if (logfd < 0) {
+ if (!(oflags & O_CREAT) && errno == ENOENT)
+ return 0;
+
+ if ((oflags & O_CREAT) && errno == EISDIR) {
+ if (remove_empty_directories(logfile)) {
+ return error("There are still logs under '%s'",
+ logfile);
+ }
+ logfd = open(logfile, oflags, 0666);
+ }
+
+ if (logfd < 0)
+ return error("Unable to append to %s: %s",
+ logfile, strerror(errno));
+ }
+
+ adjust_shared_perm(logfile);
+ close(logfd);
+ return 0;
+}
+
+static int log_ref_write(const char *refname, const unsigned char *old_sha1,
+ const unsigned char *new_sha1, const char *msg)
+{
+ int logfd, result, written, oflags = O_APPEND | O_WRONLY;
+ unsigned maxlen, len;
+ int msglen;
+ char log_file[PATH_MAX];
+ char *logrec;
+ const char *committer;
+
+ if (log_all_ref_updates < 0)
+ log_all_ref_updates = !is_bare_repository();
+
+ result = log_ref_setup(refname, log_file, sizeof(log_file));
+ if (result)
+ return result;
+
+ logfd = open(log_file, oflags);
+ if (logfd < 0)
+ return 0;
+ msglen = msg ? strlen(msg) : 0;
+ committer = git_committer_info(0);
+ maxlen = strlen(committer) + msglen + 100;
+ logrec = xmalloc(maxlen);
+ len = sprintf(logrec, "%s %s %s\n",
+ sha1_to_hex(old_sha1),
+ sha1_to_hex(new_sha1),
+ committer);
+ if (msglen)
+ len += copy_msg(logrec + len - 1, msg) - 1;
+ written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
+ free(logrec);
+ if (close(logfd) != 0 || written != len)
+ return error("Unable to append to %s", log_file);
+ return 0;
+}
+
+static int is_branch(const char *refname)
+{
+ return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
+}
+
+int write_ref_sha1(struct ref_lock *lock,
+ const unsigned char *sha1, const char *logmsg)
+{
+ static char term = '\n';
+ struct object *o;
+
+ if (!lock)
+ return -1;
+ if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
+ unlock_ref(lock);
+ return 0;
+ }
+ o = parse_object(sha1);
+ if (!o) {
+ error("Trying to write ref %s with nonexistent object %s",
+ lock->ref_name, sha1_to_hex(sha1));
+ unlock_ref(lock);
+ return -1;
+ }
+ if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
+ error("Trying to write non-commit object %s to branch %s",
+ sha1_to_hex(sha1), lock->ref_name);
+ unlock_ref(lock);
+ return -1;
+ }
+ if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
+ write_in_full(lock->lock_fd, &term, 1) != 1
+ || close_ref(lock) < 0) {
+ error("Couldn't write %s", lock->lk->filename);
+ unlock_ref(lock);
+ return -1;
+ }
+ clear_loose_ref_cache(get_ref_cache(NULL));
+ if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
+ (strcmp(lock->ref_name, lock->orig_ref_name) &&
+ log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
+ unlock_ref(lock);
+ return -1;
+ }
+ if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
+ /*
+ * Special hack: If a branch is updated directly and HEAD
+ * points to it (may happen on the remote side of a push
+ * for example) then logically the HEAD reflog should be
+ * updated too.
+ * A generic solution implies reverse symref information,
+ * but finding all symrefs pointing to the given branch
+ * would be rather costly for this rare event (the direct
+ * update of a branch) to be worth it. So let's cheat and
+ * check with HEAD only which should cover 99% of all usage
+ * scenarios (even 100% of the default ones).
+ */
+ unsigned char head_sha1[20];
+ int head_flag;
+ const char *head_ref;
+ head_ref = resolve_ref_unsafe("HEAD", head_sha1, 1, &head_flag);
+ if (head_ref && (head_flag & REF_ISSYMREF) &&
+ !strcmp(head_ref, lock->ref_name))
+ log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
+ }
+ if (commit_ref(lock)) {
+ error("Couldn't set %s", lock->ref_name);
+ unlock_ref(lock);
+ return -1;
+ }
+ unlock_ref(lock);
+ return 0;
+}
+
+int create_symref(const char *ref_target, const char *refs_heads_master,
+ const char *logmsg)
+{
+ const char *lockpath;
+ char ref[1000];
+ int fd, len, written;
+ char *git_HEAD = git_pathdup("%s", ref_target);
+ unsigned char old_sha1[20], new_sha1[20];
+
+ if (logmsg && read_ref(ref_target, old_sha1))
+ hashclr(old_sha1);
+
+ if (safe_create_leading_directories(git_HEAD) < 0)
+ return error("unable to create directory for %s", git_HEAD);
+
+#ifndef NO_SYMLINK_HEAD
+ if (prefer_symlink_refs) {
+ unlink(git_HEAD);
+ if (!symlink(refs_heads_master, git_HEAD))
+ goto done;
+ fprintf(stderr, "no symlink - falling back to symbolic ref\n");
+ }
+#endif
+
+ len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
+ if (sizeof(ref) <= len) {
+ error("refname too long: %s", refs_heads_master);
+ goto error_free_return;
+ }
+ lockpath = mkpath("%s.lock", git_HEAD);
+ fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
+ if (fd < 0) {
+ error("Unable to open %s for writing", lockpath);
+ goto error_free_return;
+ }
+ written = write_in_full(fd, ref, len);
+ if (close(fd) != 0 || written != len) {
+ error("Unable to write to %s", lockpath);
+ goto error_unlink_return;
+ }
+ if (rename(lockpath, git_HEAD) < 0) {
+ error("Unable to create %s", git_HEAD);
+ goto error_unlink_return;
+ }
+ if (adjust_shared_perm(git_HEAD)) {
+ error("Unable to fix permissions on %s", lockpath);
+ error_unlink_return:
+ unlink_or_warn(lockpath);
+ error_free_return:
+ free(git_HEAD);
+ return -1;
+ }
+
+#ifndef NO_SYMLINK_HEAD
+ done:
+#endif
+ if (logmsg && !read_ref(refs_heads_master, new_sha1))
+ log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
+
+ free(git_HEAD);
+ return 0;
+}
+
+static char *ref_msg(const char *line, const char *endp)
+{
+ const char *ep;
+ line += 82;
+ ep = memchr(line, '\n', endp - line);
+ if (!ep)
+ ep = endp;
+ return xmemdupz(line, ep - line);
+}
+
+int read_ref_at(const char *refname, unsigned long at_time, int cnt,
+ unsigned char *sha1, char **msg,
+ unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
+{
+ const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
+ char *tz_c;
+ int logfd, tz, reccnt = 0;
+ struct stat st;
+ unsigned long date;
+ unsigned char logged_sha1[20];
+ void *log_mapped;
+ size_t mapsz;
+
+ logfile = git_path("logs/%s", refname);
+ logfd = open(logfile, O_RDONLY, 0);
+ if (logfd < 0)
+ die_errno("Unable to read log '%s'", logfile);
+ fstat(logfd, &st);
+ if (!st.st_size)
+ die("Log %s is empty.", logfile);
+ mapsz = xsize_t(st.st_size);
+ log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
+ logdata = log_mapped;
+ close(logfd);
+
+ lastrec = NULL;
+ rec = logend = logdata + st.st_size;
+ while (logdata < rec) {
+ reccnt++;
+ if (logdata < rec && *(rec-1) == '\n')
+ rec--;
+ lastgt = NULL;
+ while (logdata < rec && *(rec-1) != '\n') {
+ rec--;
+ if (*rec == '>')
+ lastgt = rec;
+ }
+ if (!lastgt)
+ die("Log %s is corrupt.", logfile);
+ date = strtoul(lastgt + 1, &tz_c, 10);
+ if (date <= at_time || cnt == 0) {
+ tz = strtoul(tz_c, NULL, 10);
+ if (msg)
+ *msg = ref_msg(rec, logend);
+ if (cutoff_time)
+ *cutoff_time = date;
+ if (cutoff_tz)
+ *cutoff_tz = tz;
+ if (cutoff_cnt)
+ *cutoff_cnt = reccnt - 1;
+ if (lastrec) {
+ if (get_sha1_hex(lastrec, logged_sha1))
+ die("Log %s is corrupt.", logfile);
+ if (get_sha1_hex(rec + 41, sha1))
+ die("Log %s is corrupt.", logfile);
+ if (hashcmp(logged_sha1, sha1)) {
+ warning("Log %s has gap after %s.",
+ logfile, show_date(date, tz, DATE_RFC2822));
+ }
+ }
+ else if (date == at_time) {
+ if (get_sha1_hex(rec + 41, sha1))
+ die("Log %s is corrupt.", logfile);
+ }
+ else {
+ if (get_sha1_hex(rec + 41, logged_sha1))
+ die("Log %s is corrupt.", logfile);
+ if (hashcmp(logged_sha1, sha1)) {
+ warning("Log %s unexpectedly ended on %s.",
+ logfile, show_date(date, tz, DATE_RFC2822));
+ }
+ }
+ munmap(log_mapped, mapsz);
+ return 0;
+ }
+ lastrec = rec;
+ if (cnt > 0)
+ cnt--;
+ }
+
+ rec = logdata;
+ while (rec < logend && *rec != '>' && *rec != '\n')
+ rec++;
+ if (rec == logend || *rec == '\n')
+ die("Log %s is corrupt.", logfile);
+ date = strtoul(rec + 1, &tz_c, 10);
+ tz = strtoul(tz_c, NULL, 10);
+ if (get_sha1_hex(logdata, sha1))
+ die("Log %s is corrupt.", logfile);
+ if (is_null_sha1(sha1)) {
+ if (get_sha1_hex(logdata + 41, sha1))
+ die("Log %s is corrupt.", logfile);
+ }
+ if (msg)
+ *msg = ref_msg(logdata, logend);
+ munmap(log_mapped, mapsz);
+
+ if (cutoff_time)
+ *cutoff_time = date;
+ if (cutoff_tz)
+ *cutoff_tz = tz;
+ if (cutoff_cnt)
+ *cutoff_cnt = reccnt;
+ return 1;
+}
+
+int for_each_recent_reflog_ent(const char *refname, each_reflog_ent_fn fn, long ofs, void *cb_data)
+{
+ const char *logfile;
+ FILE *logfp;
+ struct strbuf sb = STRBUF_INIT;
+ int ret = 0;
+
+ logfile = git_path("logs/%s", refname);
+ logfp = fopen(logfile, "r");
+ if (!logfp)
+ return -1;
+
+ if (ofs) {
+ struct stat statbuf;
+ if (fstat(fileno(logfp), &statbuf) ||
+ statbuf.st_size < ofs ||
+ fseek(logfp, -ofs, SEEK_END) ||
+ strbuf_getwholeline(&sb, logfp, '\n')) {
+ fclose(logfp);
+ strbuf_release(&sb);
+ return -1;
+ }
+ }
+
+ while (!strbuf_getwholeline(&sb, logfp, '\n')) {
+ unsigned char osha1[20], nsha1[20];
+ char *email_end, *message;
+ unsigned long timestamp;
+ int tz;
+
+ /* old SP new SP name <email> SP time TAB msg LF */
+ if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' ||
+ get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' ||
+ get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' ||
+ !(email_end = strchr(sb.buf + 82, '>')) ||
+ email_end[1] != ' ' ||
+ !(timestamp = strtoul(email_end + 2, &message, 10)) ||
+ !message || message[0] != ' ' ||
+ (message[1] != '+' && message[1] != '-') ||
+ !isdigit(message[2]) || !isdigit(message[3]) ||
+ !isdigit(message[4]) || !isdigit(message[5]))
+ continue; /* corrupt? */
+ email_end[1] = '\0';
+ tz = strtol(message + 1, NULL, 10);
+ if (message[6] != '\t')
+ message += 6;
+ else
+ message += 7;
+ ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message,
+ cb_data);
+ if (ret)
+ break;
+ }
+ fclose(logfp);
+ strbuf_release(&sb);
+ return ret;
+}
+
+int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data)
+{
+ return for_each_recent_reflog_ent(refname, fn, 0, cb_data);
+}
+
+static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data)
+{
+ DIR *dir = opendir(git_path("logs/%s", base));
+ int retval = 0;
+
+ if (dir) {
+ struct dirent *de;
+ int baselen = strlen(base);
+ char *log = xmalloc(baselen + 257);
+
+ memcpy(log, base, baselen);
+ if (baselen && base[baselen-1] != '/')
+ log[baselen++] = '/';
+
+ while ((de = readdir(dir)) != NULL) {
+ struct stat st;
+ int namelen;
+
+ if (de->d_name[0] == '.')
+ continue;
+ namelen = strlen(de->d_name);
+ if (namelen > 255)
+ continue;
+ if (has_extension(de->d_name, ".lock"))
+ continue;
+ memcpy(log + baselen, de->d_name, namelen+1);
+ if (stat(git_path("logs/%s", log), &st) < 0)
+ continue;
+ if (S_ISDIR(st.st_mode)) {
+ retval = do_for_each_reflog(log, fn, cb_data);
+ } else {
+ unsigned char sha1[20];
+ if (read_ref_full(log, sha1, 0, NULL))
+ retval = error("bad ref for %s", log);
+ else
+ retval = fn(log, sha1, 0, cb_data);
+ }
+ if (retval)
+ break;
+ }
+ free(log);
+ closedir(dir);
+ }
+ else if (*base)
+ return errno;
+ return retval;
+}
+
+int for_each_reflog(each_ref_fn fn, void *cb_data)
+{
+ return do_for_each_reflog("", fn, cb_data);
+}
+
+int update_ref(const char *action, const char *refname,
+ const unsigned char *sha1, const unsigned char *oldval,
+ int flags, enum action_on_err onerr)
+{
+ static struct ref_lock *lock;
+ lock = lock_any_ref_for_update(refname, oldval, flags);
+ if (!lock) {
+ const char *str = "Cannot lock the ref '%s'.";
+ switch (onerr) {
+ case MSG_ON_ERR: error(str, refname); break;
+ case DIE_ON_ERR: die(str, refname); break;
+ case QUIET_ON_ERR: break;
+ }
+ return 1;
+ }
+ if (write_ref_sha1(lock, sha1, action) < 0) {
+ const char *str = "Cannot update the ref '%s'.";
+ switch (onerr) {
+ case MSG_ON_ERR: error(str, refname); break;
+ case DIE_ON_ERR: die(str, refname); break;
+ case QUIET_ON_ERR: break;
+ }
+ return 1;
+ }
+ return 0;
+}
+
+int ref_exists(const char *refname)
+{
+ unsigned char sha1[20];
+ return !!resolve_ref_unsafe(refname, sha1, 1, NULL);
+}
+
+struct ref *find_ref_by_name(const struct ref *list, const char *name)
+{
+ for ( ; list; list = list->next)
+ if (!strcmp(list->name, name))
+ return (struct ref *)list;
+ return NULL;
+}
+
+/*
+ * generate a format suitable for scanf from a ref_rev_parse_rules
+ * rule, that is replace the "%.*s" spec with a "%s" spec
+ */
+static void gen_scanf_fmt(char *scanf_fmt, const char *rule)
+{
+ char *spec;
+
+ spec = strstr(rule, "%.*s");
+ if (!spec || strstr(spec + 4, "%.*s"))
+ die("invalid rule in ref_rev_parse_rules: %s", rule);
+
+ /* copy all until spec */
+ strncpy(scanf_fmt, rule, spec - rule);
+ scanf_fmt[spec - rule] = '\0';
+ /* copy new spec */
+ strcat(scanf_fmt, "%s");
+ /* copy remaining rule */
+ strcat(scanf_fmt, spec + 4);
+
+ return;
+}
+
+char *shorten_unambiguous_ref(const char *refname, int strict)
+{
+ int i;
+ static char **scanf_fmts;
+ static int nr_rules;
+ char *short_name;
+
+ /* pre generate scanf formats from ref_rev_parse_rules[] */
+ if (!nr_rules) {
+ size_t total_len = 0;
+
+ /* the rule list is NULL terminated, count them first */
+ for (; ref_rev_parse_rules[nr_rules]; nr_rules++)
+ /* no +1 because strlen("%s") < strlen("%.*s") */
+ total_len += strlen(ref_rev_parse_rules[nr_rules]);
+
+ scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len);
+
+ total_len = 0;
+ for (i = 0; i < nr_rules; i++) {
+ scanf_fmts[i] = (char *)&scanf_fmts[nr_rules]
+ + total_len;
+ gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]);
+ total_len += strlen(ref_rev_parse_rules[i]);
+ }
+ }
+
+ /* bail out if there are no rules */
+ if (!nr_rules)
+ return xstrdup(refname);
+
+ /* buffer for scanf result, at most refname must fit */
+ short_name = xstrdup(refname);
+
+ /* skip first rule, it will always match */
+ for (i = nr_rules - 1; i > 0 ; --i) {
+ int j;
+ int rules_to_fail = i;
+ int short_name_len;
+
+ if (1 != sscanf(refname, scanf_fmts[i], short_name))
+ continue;
+
+ short_name_len = strlen(short_name);
+
+ /*
+ * in strict mode, all (except the matched one) rules
+ * must fail to resolve to a valid non-ambiguous ref
+ */
+ if (strict)
+ rules_to_fail = nr_rules;
+
+ /*
+ * check if the short name resolves to a valid ref,
+ * but use only rules prior to the matched one
+ */
+ for (j = 0; j < rules_to_fail; j++) {
+ const char *rule = ref_rev_parse_rules[j];
+ char refname[PATH_MAX];
+
+ /* skip matched rule */
+ if (i == j)
+ continue;
+
+ /*
+ * the short name is ambiguous, if it resolves
+ * (with this previous rule) to a valid ref
+ * read_ref() returns 0 on success
+ */
+ mksnpath(refname, sizeof(refname),
+ rule, short_name_len, short_name);
+ if (ref_exists(refname))
+ break;
+ }
+
+ /*
+ * short name is non-ambiguous if all previous rules
+ * haven't resolved to a valid ref
+ */
+ if (j == rules_to_fail)
+ return short_name;
+ }
+
+ free(short_name);
+ return xstrdup(refname);
+}
generated by cgit v0.10.2-6-g49f6 at 2024-04-19 19:29:41 (GMT)