mirror of
https://github.com/git/git.git
synced 2024-11-23 18:05:29 +08:00
Make fiel checkout function available to the git library
The merge stuff will want it soon, and we don't want to duplicate all the work..
This commit is contained in:
Linus Torvalds
parent
76f38347b4
commit
12dccc1654
2
Makefile
2
Makefile
@ -40,7 +40,7 @@ install: $(PROG) $(SCRIPTS)
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$(INSTALL) $(PROG) $(SCRIPTS) $(dest)$(bin)
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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 delta.o date.o index.o diff-delta.o patch-delta.o
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tag.o delta.o date.o index.o diff-delta.o patch-delta.o entry.o
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LIB_FILE=libgit.a
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LIB_H=cache.h object.h blob.h tree.h commit.h tag.h delta.h
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11
cache.h
11
cache.h
@ -214,4 +214,15 @@ static inline void *xcalloc(size_t nmemb, size_t size)
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return ret;
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}
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struct checkout {
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const char *base_dir;
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int base_dir_len;
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unsigned force:1,
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quiet:1,
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not_new:1,
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refresh_cache:1;
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};
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extern int checkout_entry(struct cache_entry *ce, struct checkout *state);
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#endif /* CACHE_H */
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193
checkout-cache.c
193
checkout-cache.c
@ -32,175 +32,22 @@
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* of "-a" causing problems (not possible in the above example,
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* but get used to it in scripting!).
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*/
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#include <sys/types.h>
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#include <dirent.h>
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#include "cache.h"
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static int force = 0, quiet = 0, not_new = 0, refresh_cache = 0;
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static const char *base_dir = "";
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static int base_dir_len = 0;
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static void create_directories(const char *path)
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{
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int len = strlen(path);
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char *buf = xmalloc(len + 1);
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const char *slash = path;
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while ((slash = strchr(slash+1, '/')) != NULL) {
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len = slash - path;
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memcpy(buf, path, len);
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buf[len] = 0;
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if (mkdir(buf, 0755)) {
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if (errno == EEXIST) {
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struct stat st;
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if (len > base_dir_len && force && !unlink(buf) && !mkdir(buf, 0755))
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continue;
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if (!stat(buf, &st) && S_ISDIR(st.st_mode))
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continue; /* ok */
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}
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die("cannot create directory at %s", buf);
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}
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}
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free(buf);
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}
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static void remove_subtree(const char *path)
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{
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DIR *dir = opendir(path);
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struct dirent *de;
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char pathbuf[PATH_MAX];
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char *name;
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if (!dir)
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die("cannot opendir %s", path);
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strcpy(pathbuf, path);
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name = pathbuf + strlen(path);
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*name++ = '/';
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while ((de = readdir(dir)) != NULL) {
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struct stat st;
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if ((de->d_name[0] == '.') &&
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((de->d_name[1] == 0) ||
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((de->d_name[1] == '.') && de->d_name[2] == 0)))
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continue;
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strcpy(name, de->d_name);
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if (lstat(pathbuf, &st))
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die("cannot lstat %s", pathbuf);
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if (S_ISDIR(st.st_mode))
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remove_subtree(pathbuf);
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else if (unlink(pathbuf))
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die("cannot unlink %s", pathbuf);
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}
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closedir(dir);
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if (rmdir(path))
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die("cannot rmdir %s", path);
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}
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static int create_file(const char *path, unsigned int mode)
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{
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int fd;
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mode = (mode & 0100) ? 0777 : 0666;
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create_directories(path);
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fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
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if (fd < 0) {
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if (errno == EISDIR && force) {
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remove_subtree(path);
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fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
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}
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}
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return fd;
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}
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static int write_entry(struct cache_entry *ce, const char *path)
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{
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int fd;
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void *new;
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unsigned long size;
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long wrote;
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char type[20];
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char target[1024];
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new = read_sha1_file(ce->sha1, type, &size);
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if (!new || strcmp(type, "blob")) {
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if (new)
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free(new);
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return error("git-checkout-cache: unable to read sha1 file of %s (%s)",
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path, sha1_to_hex(ce->sha1));
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}
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switch (ntohl(ce->ce_mode) & S_IFMT) {
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case S_IFREG:
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fd = create_file(path, ntohl(ce->ce_mode));
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if (fd < 0) {
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free(new);
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return error("git-checkout-cache: unable to create file %s (%s)",
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path, strerror(errno));
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}
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wrote = write(fd, new, size);
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close(fd);
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free(new);
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if (wrote != size)
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return error("git-checkout-cache: unable to write file %s", path);
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break;
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case S_IFLNK:
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memcpy(target, new, size);
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target[size] = '\0';
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create_directories(path);
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if (symlink(target, path)) {
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free(new);
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return error("git-checkout-cache: unable to create symlink %s (%s)",
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path, strerror(errno));
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}
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free(new);
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break;
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default:
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free(new);
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return error("git-checkout-cache: unknown file mode for %s", path);
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}
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if (refresh_cache) {
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struct stat st;
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lstat(ce->name, &st);
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fill_stat_cache_info(ce, &st);
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}
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return 0;
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}
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static int checkout_entry(struct cache_entry *ce)
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{
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struct stat st;
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static char path[MAXPATHLEN+1];
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int len = base_dir_len;
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memcpy(path, base_dir, len);
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strcpy(path + len, ce->name);
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if (!lstat(path, &st)) {
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unsigned changed = ce_match_stat(ce, &st);
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if (!changed)
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return 0;
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if (!force) {
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if (!quiet)
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fprintf(stderr, "git-checkout-cache: %s already exists\n", path);
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return 0;
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}
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/*
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* We unlink the old file, to get the new one with the
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* right permissions (including umask, which is nasty
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* to emulate by hand - much easier to let the system
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* just do the right thing)
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*/
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unlink(path);
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} else if (not_new)
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return 0;
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return write_entry(ce, path);
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}
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static struct checkout state = {
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.base_dir = "",
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.base_dir_len = 0,
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.force = 0,
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.quiet = 0,
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.not_new = 0,
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.refresh_cache = 0,
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};
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static int checkout_file(const char *name)
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{
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int pos = cache_name_pos(name, strlen(name));
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if (pos < 0) {
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if (!quiet) {
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if (!state.quiet) {
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pos = -pos - 1;
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fprintf(stderr,
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"git-checkout-cache: %s is %s.\n",
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@ -211,7 +58,7 @@ static int checkout_file(const char *name)
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}
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return -1;
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}
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return checkout_entry(active_cache[pos]);
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return checkout_entry(active_cache[pos], &state);
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}
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static int checkout_all(void)
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@ -222,7 +69,7 @@ static int checkout_all(void)
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struct cache_entry *ce = active_cache[i];
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if (ce_stage(ce))
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continue;
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if (checkout_entry(ce) < 0)
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if (checkout_entry(ce, &state) < 0)
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return -1;
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}
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return 0;
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@ -250,19 +97,19 @@ int main(int argc, char **argv)
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continue;
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}
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if (!strcmp(arg, "-f")) {
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force = 1;
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state.force = 1;
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continue;
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}
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if (!strcmp(arg, "-q")) {
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quiet = 1;
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state.quiet = 1;
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continue;
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}
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if (!strcmp(arg, "-n")) {
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not_new = 1;
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state.not_new = 1;
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continue;
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}
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if (!strcmp(arg, "-u")) {
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refresh_cache = 1;
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state.refresh_cache = 1;
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if (newfd < 0)
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newfd = hold_index_file_for_update
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(&cache_file,
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@ -272,20 +119,20 @@ int main(int argc, char **argv)
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continue;
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}
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if (!memcmp(arg, "--prefix=", 9)) {
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base_dir = arg+9;
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base_dir_len = strlen(base_dir);
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state.base_dir = arg+9;
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state.base_dir_len = strlen(state.base_dir);
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continue;
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}
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}
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if (base_dir_len) {
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if (state.base_dir_len) {
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/* when --prefix is specified we do not
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* want to update cache.
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*/
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if (refresh_cache) {
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if (state.refresh_cache) {
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close(newfd); newfd = -1;
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rollback_index_file(&cache_file);
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}
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refresh_cache = 0;
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state.refresh_cache = 0;
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}
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checkout_file(arg);
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}
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160
entry.c
Normal file
160
entry.c
Normal file
@ -0,0 +1,160 @@
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#include <sys/types.h>
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#include <dirent.h>
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#include "cache.h"
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static void create_directories(const char *path, struct checkout *state)
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{
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int len = strlen(path);
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char *buf = xmalloc(len + 1);
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const char *slash = path;
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while ((slash = strchr(slash+1, '/')) != NULL) {
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len = slash - path;
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memcpy(buf, path, len);
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buf[len] = 0;
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if (mkdir(buf, 0755)) {
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if (errno == EEXIST) {
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struct stat st;
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if (len > state->base_dir_len && state->force && !unlink(buf) && !mkdir(buf, 0755))
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continue;
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if (!stat(buf, &st) && S_ISDIR(st.st_mode))
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continue; /* ok */
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}
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die("cannot create directory at %s", buf);
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}
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}
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free(buf);
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}
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static void remove_subtree(const char *path)
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{
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DIR *dir = opendir(path);
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struct dirent *de;
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char pathbuf[PATH_MAX];
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char *name;
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if (!dir)
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die("cannot opendir %s", path);
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strcpy(pathbuf, path);
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name = pathbuf + strlen(path);
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*name++ = '/';
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while ((de = readdir(dir)) != NULL) {
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struct stat st;
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if ((de->d_name[0] == '.') &&
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((de->d_name[1] == 0) ||
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((de->d_name[1] == '.') && de->d_name[2] == 0)))
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continue;
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strcpy(name, de->d_name);
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if (lstat(pathbuf, &st))
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die("cannot lstat %s", pathbuf);
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if (S_ISDIR(st.st_mode))
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remove_subtree(pathbuf);
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else if (unlink(pathbuf))
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die("cannot unlink %s", pathbuf);
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}
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closedir(dir);
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if (rmdir(path))
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die("cannot rmdir %s", path);
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}
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static int create_file(const char *path, unsigned int mode, int force)
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{
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int fd;
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mode = (mode & 0100) ? 0777 : 0666;
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fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
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if (fd < 0) {
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if (errno == EISDIR && force) {
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remove_subtree(path);
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fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
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}
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}
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return fd;
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}
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static int write_entry(struct cache_entry *ce, const char *path, struct checkout *state)
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{
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int fd;
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void *new;
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unsigned long size;
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long wrote;
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char type[20];
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char target[1024];
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new = read_sha1_file(ce->sha1, type, &size);
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if (!new || strcmp(type, "blob")) {
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if (new)
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free(new);
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return error("git-checkout-cache: unable to read sha1 file of %s (%s)",
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path, sha1_to_hex(ce->sha1));
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}
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switch (ntohl(ce->ce_mode) & S_IFMT) {
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case S_IFREG:
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fd = create_file(path, ntohl(ce->ce_mode), state->force);
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if (fd < 0) {
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free(new);
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return error("git-checkout-cache: unable to create file %s (%s)",
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path, strerror(errno));
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}
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wrote = write(fd, new, size);
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close(fd);
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free(new);
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if (wrote != size)
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return error("git-checkout-cache: unable to write file %s", path);
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break;
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case S_IFLNK:
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memcpy(target, new, size);
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target[size] = '\0';
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if (symlink(target, path)) {
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free(new);
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return error("git-checkout-cache: unable to create symlink %s (%s)",
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path, strerror(errno));
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}
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free(new);
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break;
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default:
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free(new);
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return error("git-checkout-cache: unknown file mode for %s", path);
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}
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if (state->update) {
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struct stat st;
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lstat(ce->name, &st);
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fill_stat_cache_info(ce, &st);
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}
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return 0;
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}
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int checkout_entry(struct cache_entry *ce, struct checkout *state)
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{
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struct stat st;
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static char path[MAXPATHLEN+1];
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int len = state->base_dir_len;
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memcpy(path, state->base_dir, len);
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strcpy(path + len, ce->name);
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if (!lstat(path, &st)) {
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unsigned changed = ce_match_stat(ce, &st);
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if (!changed)
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return 0;
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if (!state->force) {
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if (!state->quiet)
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fprintf(stderr, "git-checkout-cache: %s already exists\n", path);
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return 0;
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}
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/*
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* We unlink the old file, to get the new one with the
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* right permissions (including umask, which is nasty
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* to emulate by hand - much easier to let the system
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* just do the right thing)
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*/
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unlink(path);
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} else if (state->not_new)
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return 0;
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create_directories(path, state);
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return write_entry(ce, path, state);
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}
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