Make "read-tree" read the tree into the current directory cache.

It will no longer update the actual working directory, just the
cache. To update the working directory, you need to use "checkout-cache".

diff --git a/checkout-cache.c b/checkout-cache.c
index 6baf4f2..cfbc47e 100644 (file)
--- a/checkout-cache.c
+++ b/checkout-cache.c
@@ -36,6 +36,34 @@
 
 static int force = 0, quiet = 0;
 
+static void create_directories(const char *path)
+{
+       int len = strlen(path);
+       char *buf = malloc(len + 1);
+       const char *slash = path;
+
+       while ((slash = strchr(slash+1, '/')) != NULL) {
+               len = slash - path;
+               memcpy(buf, path, len);
+               buf[len] = 0;
+               mkdir(buf, 0700);
+       }
+}
+
+static int create_file(const char *path, unsigned int mode)
+{
+       int fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, 0600);
+       if (fd < 0) {
+               if (errno == ENOENT) {
+                       create_directories(path);
+                       fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, 0600);
+               }
+       }
+       if (fd >= 0)
+               fchmod(fd, mode);
+       return fd;
+}
+
 static int write_entry(struct cache_entry *ce)
 {
        int fd;
@@ -50,7 +78,7 @@ static int write_entry(struct cache_entry *ce)
                        ce->name, sha1_to_hex(ce->sha1));
                return -1;
        }
-       fd = open(ce->name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+       fd = create_file(ce->name, ce->st_mode);
        if (fd < 0) {
                fprintf(stderr, "checkout-cache: unable to create %s (%s)\n",
                        ce->name, strerror(errno));

diff --git a/read-tree.c b/read-tree.c
index af486ff..efd8d36 100644 (file)
--- a/read-tree.c
+++ b/read-tree.c
@@ -5,33 +5,22 @@
  */
 #include "cache.h"
 
-static void create_directories(const char *path)
+static int read_one_entry(unsigned char *sha1, const char *pathname, unsigned mode)
 {
-       int len = strlen(path);
-       char *buf = malloc(len + 1);
-       const char *slash = path;
+       int len = strlen(pathname);
+       unsigned int size = cache_entry_size(len);
+       struct cache_entry *ce = malloc(size);
 
-       while ((slash = strchr(slash+1, '/')) != NULL) {
-               len = slash - path;
-               memcpy(buf, path, len);
-               buf[len] = 0;
-               mkdir(buf, 0700);
-       }
-}
+       memset(ce, 0, size);
 
-static int create_file(const char *path)
-{
-       int fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, 0600);
-       if (fd < 0) {
-               if (errno == ENOENT) {
-                       create_directories(path);
-                       fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, 0600);
-               }
-       }
-       return fd;
+       ce->st_mode = mode;
+       ce->namelen = len;
+       memcpy(ce->name, pathname, len+1);
+       memcpy(ce->sha1, sha1, 20);
+       return add_cache_entry(ce);
 }
 
-static int unpack(unsigned char *sha1)
+static int read_tree(unsigned char *sha1)
 {
        void *buffer;
        unsigned long size;
@@ -39,49 +28,64 @@ static int unpack(unsigned char *sha1)
 
        buffer = read_sha1_file(sha1, type, &size);
        if (!buffer)
-               usage("unable to read sha1 file");
+               return -1;
        if (strcmp(type, "tree"))
-               usage("expected a 'tree' node");
+               return -1;
        while (size) {
                int len = strlen(buffer)+1;
                unsigned char *sha1 = buffer + len;
                char *path = strchr(buffer, ' ')+1;
-               char *data;
-               unsigned long filesize;
                unsigned int mode;
-               int fd;
 
                if (size < len + 20 || sscanf(buffer, "%o", &mode) != 1)
-                       usage("corrupt 'tree' file");
+                       return -1;
+
                buffer = sha1 + 20;
                size -= len + 20;
-               data = read_sha1_file(sha1, type, &filesize);
-               if (!data || strcmp(type, "blob"))
-                       usage("tree file refers to bad file data");
-               fd = create_file(path);
-               if (fd < 0)
-                       usage("unable to create file");
-               if (write(fd, data, filesize) != filesize)
-                       usage("unable to write file");
-               fchmod(fd, mode);
-               close(fd);
-               free(data);
+
+               if (read_one_entry(sha1, path, mode) < 0)
+                       return -1;
        }
        return 0;
 }
 
 int main(int argc, char **argv)
 {
+       int i, newfd;
        unsigned char sha1[20];
 
-       if (argc != 2)
-               usage("read-tree <key>");
-       if (get_sha1_hex(argv[1], sha1) < 0)
-               usage("read-tree <key>");
-       sha1_file_directory = getenv(DB_ENVIRONMENT);
-       if (!sha1_file_directory)
-               sha1_file_directory = DEFAULT_DB_ENVIRONMENT;
-       if (unpack(sha1) < 0)
-               usage("unpack failed");
-       return 0;
+       newfd = open(".dircache/index.lock", O_RDWR | O_CREAT | O_EXCL, 0600);
+       if (newfd < 0)
+               usage("unable to create new cachefile");
+
+       for (i = 1; i < argc; i++) {
+               const char *arg = argv[i];
+
+               /* "-m" stands for "merge" current directory cache */
+               if (!strcmp(arg, "-m")) {
+                       if (active_cache) {
+                               fprintf(stderr, "read-tree: cannot merge old cache on top of new\n");
+                               goto out;
+                       }
+                       if (read_cache() < 0) {
+                               fprintf(stderr, "read-tree: corrupt directory cache\n");
+                               goto out;
+                       }
+                       continue;
+               }
+               if (get_sha1_hex(arg, sha1) < 0) {
+                       fprintf(stderr, "read-tree [-m] <sha1>\n");
+                       goto out;
+               }
+               if (read_tree(sha1) < 0) {
+                       fprintf(stderr, "failed to unpack tree object %s\n", arg);
+                       goto out;
+               }
+       }
+       if (!write_cache(newfd, active_cache, active_nr) && !rename(".dircache/index.lock", ".dircache/index"))
+               return 0;
+
+out:
+       unlink(".dircache/index.lock");
+       exit(1);
 }