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https://github.com/git/git
synced 2024-10-01 06:05:20 +00:00
Update get_sha1() to grok extended format.
Everybody envies rev-parse, who is the only one that can grok the extended sha1 format. Move the get_extended_sha1() out of rev-parse, rename it to get_sha1() and make it available to everybody else. The one I posted earlier to the list had one bug where it did not handle a name that ends with a digit correctly (it incorrectly tried the "Nth parent" path). This commit fixes it. Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano
parent
37fde874c2
commit
9938af6a85
3
Makefile
3
Makefile
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@ -95,7 +95,8 @@ LIB_H=cache.h object.h blob.h tree.h commit.h tag.h delta.h epoch.h csum-file.h
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pack.h pkt-line.h refs.h
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LIB_OBJS=read-cache.o sha1_file.o usage.o object.o commit.o tree.o blob.o \
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tag.o date.o index.o diff-delta.o patch-delta.o entry.o path.o \
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refs.o csum-file.o pack-check.o pkt-line.o connect.o ident.o
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refs.o csum-file.o pack-check.o pkt-line.o connect.o ident.o \
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sha1_name.o
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LIB_H += rev-cache.h
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LIB_OBJS += rev-cache.o
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188
rev-parse.c
188
rev-parse.c
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@ -21,8 +21,6 @@ static int output_sq = 0;
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#define REVERSED 1
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static int show_type = NORMAL;
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static int get_extended_sha1(char *name, unsigned char *sha1);
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/*
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* Some arguments are relevant "revision" arguments,
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* others are about output format or other details.
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@ -107,182 +105,6 @@ static void show_arg(char *arg)
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show_norev(arg);
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}
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static int get_parent(char *name, unsigned char *result, int idx)
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{
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unsigned char sha1[20];
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int ret = get_extended_sha1(name, sha1);
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struct commit *commit;
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struct commit_list *p;
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if (ret)
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return ret;
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commit = lookup_commit_reference(sha1);
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if (!commit)
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return -1;
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if (parse_commit(commit))
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return -1;
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if (!idx) {
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memcpy(result, commit->object.sha1, 20);
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return 0;
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}
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p = commit->parents;
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while (p) {
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if (!--idx) {
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memcpy(result, p->item->object.sha1, 20);
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return 0;
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}
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p = p->next;
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}
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return -1;
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}
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static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
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{
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static char dirname[PATH_MAX];
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char hex[40];
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DIR *dir;
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int found;
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snprintf(dirname, sizeof(dirname), "%s/%.2s", get_object_directory(), name);
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dir = opendir(dirname);
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sprintf(hex, "%.2s", name);
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found = 0;
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if (dir) {
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struct dirent *de;
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while ((de = readdir(dir)) != NULL) {
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if (strlen(de->d_name) != 38)
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continue;
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if (memcmp(de->d_name, name + 2, len-2))
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continue;
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memcpy(hex + 2, de->d_name, 38);
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if (++found > 1)
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break;
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}
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closedir(dir);
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}
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if (found == 1)
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return get_sha1_hex(hex, sha1) == 0;
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return 0;
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}
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static int match_sha(unsigned len, const unsigned char *a, const unsigned char *b)
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{
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do {
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if (*a != *b)
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return 0;
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a++;
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b++;
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len -= 2;
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} while (len > 1);
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if (len)
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if ((*a ^ *b) & 0xf0)
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return 0;
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return 1;
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}
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static int find_short_packed_object(int len, const unsigned char *match, unsigned char *sha1)
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{
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struct packed_git *p;
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prepare_packed_git();
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for (p = packed_git; p; p = p->next) {
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unsigned num = num_packed_objects(p);
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unsigned first = 0, last = num;
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while (first < last) {
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unsigned mid = (first + last) / 2;
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unsigned char now[20];
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int cmp;
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nth_packed_object_sha1(p, mid, now);
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cmp = memcmp(match, now, 20);
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if (!cmp) {
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first = mid;
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break;
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}
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if (cmp > 0) {
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first = mid+1;
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continue;
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}
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last = mid;
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}
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if (first < num) {
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unsigned char now[20], next[20];
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nth_packed_object_sha1(p, first, now);
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if (match_sha(len, match, now)) {
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if (nth_packed_object_sha1(p, first+1, next) || !match_sha(len, match, next)) {
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memcpy(sha1, now, 20);
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return 1;
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}
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}
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}
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}
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return 0;
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}
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static int get_short_sha1(char *name, unsigned char *sha1)
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{
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int i;
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char canonical[40];
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unsigned char res[20];
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memset(res, 0, 20);
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memset(canonical, 'x', 40);
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for (i = 0;;i++) {
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unsigned char c = name[i];
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unsigned char val;
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if (!c || i > 40)
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break;
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if (c >= '0' && c <= '9')
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val = c - '0';
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else if (c >= 'a' && c <= 'f')
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val = c - 'a' + 10;
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else if (c >= 'A' && c <='F') {
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val = c - 'A' + 10;
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c -= 'A' - 'a';
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}
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else
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return -1;
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canonical[i] = c;
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if (!(i & 1))
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val <<= 4;
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res[i >> 1] |= val;
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}
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if (i < 4)
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return -1;
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if (find_short_object_filename(i, canonical, sha1))
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return 0;
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if (find_short_packed_object(i, res, sha1))
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return 0;
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return -1;
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}
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/*
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* This is like "get_sha1()", except it allows "sha1 expressions",
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* notably "xyz^" for "parent of xyz"
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*/
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static int get_extended_sha1(char *name, unsigned char *sha1)
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{
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int parent, ret;
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int len = strlen(name);
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parent = 1;
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if (len > 2 && name[len-1] >= '0' && name[len-1] <= '9') {
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parent = name[len-1] - '0';
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len--;
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}
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if (len > 1 && name[len-1] == '^') {
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name[len-1] = 0;
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ret = get_parent(name, sha1, parent);
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name[len-1] = '^';
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if (!ret)
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return 0;
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}
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ret = get_sha1(name, sha1);
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if (!ret)
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return 0;
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return get_short_sha1(name, sha1);
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}
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static void show_default(void)
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{
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char *s = def;
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@ -291,7 +113,7 @@ static void show_default(void)
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unsigned char sha1[20];
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def = NULL;
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if (!get_extended_sha1(s, sha1)) {
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if (!get_sha1(s, sha1)) {
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show_rev(NORMAL, sha1);
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return;
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}
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@ -372,10 +194,10 @@ int main(int argc, char **argv)
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unsigned char end[20];
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char *n = dotdot+2;
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*dotdot = 0;
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if (!get_extended_sha1(arg, sha1)) {
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if (!get_sha1(arg, sha1)) {
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if (!*n)
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n = "HEAD";
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if (!get_extended_sha1(n, end)) {
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if (!get_sha1(n, end)) {
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if (no_revs)
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continue;
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def = NULL;
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@ -386,14 +208,14 @@ int main(int argc, char **argv)
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}
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*dotdot = '.';
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}
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if (!get_extended_sha1(arg, sha1)) {
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if (!get_sha1(arg, sha1)) {
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if (no_revs)
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continue;
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def = NULL;
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show_rev(NORMAL, sha1);
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continue;
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}
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if (*arg == '^' && !get_extended_sha1(arg+1, sha1)) {
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if (*arg == '^' && !get_sha1(arg+1, sha1)) {
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if (no_revs)
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continue;
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def = NULL;
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39
sha1_file.c
39
sha1_file.c
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@ -46,21 +46,6 @@ int get_sha1_hex(const char *hex, unsigned char *sha1)
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return 0;
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}
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static int get_sha1_file(const char *path, unsigned char *result)
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{
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char buffer[60];
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int fd = open(path, O_RDONLY);
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int len;
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if (fd < 0)
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return -1;
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len = read(fd, buffer, sizeof(buffer));
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close(fd);
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if (len < 40)
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return -1;
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return get_sha1_hex(buffer, result);
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}
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static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir,
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*git_graft_file;
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static void setup_git_env(void)
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@ -132,30 +117,6 @@ int safe_create_leading_directories(char *path)
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return 0;
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}
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int get_sha1(const char *str, unsigned char *sha1)
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{
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static const char *prefix[] = {
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"",
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"refs",
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"refs/tags",
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"refs/heads",
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"refs/snap",
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NULL
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};
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const char **p;
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if (!get_sha1_hex(str, sha1))
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return 0;
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for (p = prefix; *p; p++) {
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char * pathname = git_path("%s/%s", *p, str);
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if (!get_sha1_file(pathname, sha1))
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return 0;
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}
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return -1;
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}
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char * sha1_to_hex(const unsigned char *sha1)
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{
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static char buffer[50];
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228
sha1_name.c
Normal file
228
sha1_name.c
Normal file
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@ -0,0 +1,228 @@
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#include "cache.h"
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#include "commit.h"
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static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
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{
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static char dirname[PATH_MAX];
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char hex[40];
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DIR *dir;
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int found;
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snprintf(dirname, sizeof(dirname), "%s/%.2s", get_object_directory(), name);
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dir = opendir(dirname);
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sprintf(hex, "%.2s", name);
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found = 0;
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if (dir) {
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struct dirent *de;
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while ((de = readdir(dir)) != NULL) {
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if (strlen(de->d_name) != 38)
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continue;
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if (memcmp(de->d_name, name + 2, len-2))
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continue;
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memcpy(hex + 2, de->d_name, 38);
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if (++found > 1)
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break;
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}
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closedir(dir);
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}
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if (found == 1)
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return get_sha1_hex(hex, sha1) == 0;
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return 0;
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}
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static int match_sha(unsigned len, const unsigned char *a, const unsigned char *b)
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{
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do {
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if (*a != *b)
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return 0;
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a++;
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b++;
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len -= 2;
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} while (len > 1);
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if (len)
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if ((*a ^ *b) & 0xf0)
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return 0;
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return 1;
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}
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static int find_short_packed_object(int len, const unsigned char *match, unsigned char *sha1)
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{
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struct packed_git *p;
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prepare_packed_git();
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for (p = packed_git; p; p = p->next) {
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unsigned num = num_packed_objects(p);
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unsigned first = 0, last = num;
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while (first < last) {
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unsigned mid = (first + last) / 2;
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unsigned char now[20];
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int cmp;
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nth_packed_object_sha1(p, mid, now);
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cmp = memcmp(match, now, 20);
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if (!cmp) {
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first = mid;
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break;
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}
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if (cmp > 0) {
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first = mid+1;
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continue;
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}
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last = mid;
|
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}
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if (first < num) {
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unsigned char now[20], next[20];
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nth_packed_object_sha1(p, first, now);
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if (match_sha(len, match, now)) {
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if (nth_packed_object_sha1(p, first+1, next) || !match_sha(len, match, next)) {
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memcpy(sha1, now, 20);
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return 1;
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}
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}
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}
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}
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return 0;
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}
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static int get_short_sha1(const char *name, unsigned char *sha1)
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{
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int i;
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char canonical[40];
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unsigned char res[20];
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|
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memset(res, 0, 20);
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memset(canonical, 'x', 40);
|
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for (i = 0;;i++) {
|
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unsigned char c = name[i];
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unsigned char val;
|
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if (!c || i > 40)
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break;
|
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if (c >= '0' && c <= '9')
|
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val = c - '0';
|
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else if (c >= 'a' && c <= 'f')
|
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val = c - 'a' + 10;
|
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else if (c >= 'A' && c <='F') {
|
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val = c - 'A' + 10;
|
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c -= 'A' - 'a';
|
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}
|
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else
|
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return -1;
|
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canonical[i] = c;
|
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if (!(i & 1))
|
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val <<= 4;
|
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res[i >> 1] |= val;
|
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}
|
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if (i < 4)
|
||||
return -1;
|
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if (find_short_object_filename(i, canonical, sha1))
|
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return 0;
|
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if (find_short_packed_object(i, res, sha1))
|
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return 0;
|
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return -1;
|
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}
|
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|
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static int get_sha1_file(const char *path, unsigned char *result)
|
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{
|
||||
char buffer[60];
|
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int fd = open(path, O_RDONLY);
|
||||
int len;
|
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|
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if (fd < 0)
|
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return -1;
|
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len = read(fd, buffer, sizeof(buffer));
|
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close(fd);
|
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if (len < 40)
|
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return -1;
|
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return get_sha1_hex(buffer, result);
|
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}
|
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|
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static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
|
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{
|
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static const char *prefix[] = {
|
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"",
|
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"refs",
|
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"refs/tags",
|
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"refs/heads",
|
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"refs/snap",
|
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NULL
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};
|
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const char **p;
|
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|
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if (!get_sha1_hex(str, sha1))
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return 0;
|
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|
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for (p = prefix; *p; p++) {
|
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char *pathname = git_path("%s/%.*s", *p, len, str);
|
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if (!get_sha1_file(pathname, sha1))
|
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return 0;
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}
|
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|
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return -1;
|
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}
|
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|
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static int get_sha1_1(const char *name, int len, unsigned char *sha1);
|
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|
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static int get_parent(const char *name, int len,
|
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unsigned char *result, int idx)
|
||||
{
|
||||
unsigned char sha1[20];
|
||||
int ret = get_sha1_1(name, len, sha1);
|
||||
struct commit *commit;
|
||||
struct commit_list *p;
|
||||
|
||||
if (ret)
|
||||
return ret;
|
||||
commit = lookup_commit_reference(sha1);
|
||||
if (!commit)
|
||||
return -1;
|
||||
if (parse_commit(commit))
|
||||
return -1;
|
||||
if (!idx) {
|
||||
memcpy(result, commit->object.sha1, 20);
|
||||
return 0;
|
||||
}
|
||||
p = commit->parents;
|
||||
while (p) {
|
||||
if (!--idx) {
|
||||
memcpy(result, p->item->object.sha1, 20);
|
||||
return 0;
|
||||
}
|
||||
p = p->next;
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
|
||||
static int get_sha1_1(const char *name, int len, unsigned char *sha1)
|
||||
{
|
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int parent, ret;
|
||||
|
||||
/* foo^[0-9] or foo^ (== foo^1); we do not do more than 9 parents. */
|
||||
if (len > 2 && name[len-2] == '^' &&
|
||||
name[len-1] >= '0' && name[len-1] <= '9') {
|
||||
parent = name[len-1] - '0';
|
||||
len -= 2;
|
||||
}
|
||||
else if (len > 1 && name[len-1] == '^')
|
||||
parent = 1;
|
||||
else
|
||||
parent = -1;
|
||||
|
||||
if (0 <= parent) {
|
||||
ret = get_parent(name, len-1, sha1, parent);
|
||||
if (!ret)
|
||||
return 0;
|
||||
}
|
||||
ret = get_sha1_basic(name, len, sha1);
|
||||
if (!ret)
|
||||
return 0;
|
||||
return get_short_sha1(name, sha1);
|
||||
}
|
||||
|
||||
/*
|
||||
* This is like "get_sha1_basic()", except it allows "sha1 expressions",
|
||||
* notably "xyz^" for "parent of xyz"
|
||||
*/
|
||||
int get_sha1(const char *name, unsigned char *sha1)
|
||||
{
|
||||
return get_sha1_1(name, strlen(name), sha1);
|
||||
}
|
||||
Loading…
Reference in a new issue