[PATCH] Simplify building of programs

[git.git] / checkout-cache.c

diff --git a/checkout-cache.c b/checkout-cache.c
index 6baf4f2..f65be62 100644 (file)
--- a/checkout-cache.c
+++ b/checkout-cache.c
@@ -36,7 +36,36 @@
 
 static int force = 0, quiet = 0;
 
-static int write_entry(struct cache_entry *ce)
+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, 0755);
+       }
+}
+
+static int create_file(const char *path, unsigned int mode)
+{
+       int fd;
+
+       mode = (mode & 0100) ? 0777 : 0666;
+       fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
+       if (fd < 0) {
+               if (errno == ENOENT) {
+                       create_directories(path);
+                       fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
+               }
+       }
+       return fd;
+}
+
+static int write_entry(struct cache_entry *ce, const char *path)
 {
        int fd;
        void *new;
@@ -46,59 +75,80 @@ static int write_entry(struct cache_entry *ce)
 
        new = read_sha1_file(ce->sha1, type, &size);
        if (!new || strcmp(type, "blob")) {
-               fprintf(stderr, "checkout-cache: unable to read sha1 file of %s (%s)\n",
-                       ce->name, sha1_to_hex(ce->sha1));
-               return -1;
+               return error("checkout-cache: unable to read sha1 file of %s (%s)",
+                       path, sha1_to_hex(ce->sha1));
        }
-       fd = open(ce->name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+       fd = create_file(path, ntohl(ce->ce_mode));
        if (fd < 0) {
-               fprintf(stderr, "checkout-cache: unable to create %s (%s)\n",
-                       ce->name, strerror(errno));
                free(new);
-               return -1;
+               return error("checkout-cache: unable to create %s (%s)",
+                       path, strerror(errno));
        }
        wrote = write(fd, new, size);
        close(fd);
        free(new);
-       if (wrote == size)
-               return 0;
-       fprintf(stderr, "checkout-cache: unable to write %s\n", ce->name);
-       return -1;
+       if (wrote != size)
+               return error("checkout-cache: unable to write %s", path);
+       return 0;
 }
 
-static int checkout_entry(struct cache_entry *ce)
+static int checkout_entry(struct cache_entry *ce, const char *base_dir)
 {
-       if (!force) {
-               struct stat st;
+       struct stat st;
+       static char path[MAXPATHLEN+1];
+       int len = strlen(base_dir);
+
+       memcpy(path, base_dir, len);
+       strcpy(path + len, ce->name);
 
-               if (!stat(ce->name, &st)) {
-                       unsigned changed = cache_match_stat(ce, &st);
-                       if (changed && !quiet)
-                               fprintf(stderr, "checkout-cache: %s already exists\n", ce->name);
+       if (!stat(path, &st)) {
+               unsigned changed = cache_match_stat(ce, &st);
+               if (!changed)
+                       return 0;
+               if (!force) {
+                       if (!quiet)
+                               fprintf(stderr, "checkout-cache: %s already exists\n", path);
                        return 0;
                }
+
+               /*
+                * We unlink the old file, to get the new one with the
+                * right permissions (including umask, which is nasty
+                * to emulate by hand - much easier to let the system
+                * just do the right thing)
+                */
+               unlink(path);
        }
-       return write_entry(ce);
+       return write_entry(ce, path);
 }
 
-static int checkout_file(const char *name)
+static int checkout_file(const char *name, const char *base_dir)
 {
        int pos = cache_name_pos(name, strlen(name));
        if (pos < 0) {
-               if (!quiet)
-                       fprintf(stderr, "checkout-cache: %s is not in the cache\n", name);
+               if (!quiet) {
+                       pos = -pos - 1;
+                       fprintf(stderr,
+                               "checkout-cache: %s is %s.\n",
+                               name,
+                               (pos < active_nr &&
+                                !strcmp(active_cache[pos]->name, name)) ?
+                               "unmerged" : "not in the cache");
+               }
                return -1;
        }
-       return checkout_entry(active_cache[pos]);
+       return checkout_entry(active_cache[pos], base_dir);
 }
 
-static int checkout_all(void)
+static int checkout_all(const char *base_dir)
 {
        int i;
 
        for (i = 0; i < active_nr ; i++) {
                struct cache_entry *ce = active_cache[i];
-               if (checkout_entry(ce) < 0)
+               if (ce_stage(ce))
+                       continue;
+               if (checkout_entry(ce, base_dir) < 0)
                        return -1;
        }
        return 0;
@@ -107,17 +157,17 @@ static int checkout_all(void)
 int main(int argc, char **argv)
 {
        int i, force_filename = 0;
+       const char *base_dir = "";
 
        if (read_cache() < 0) {
-               fprintf(stderr, "Invalid cache\n");
-               exit(1);
+               die("invalid cache");
        }
 
        for (i = 1; i < argc; i++) {
                const char *arg = argv[i];
                if (!force_filename) {
                        if (!strcmp(arg, "-a")) {
-                               checkout_all();
+                               checkout_all(base_dir);
                                continue;
                        }
                        if (!strcmp(arg, "--")) {
@@ -132,8 +182,12 @@ int main(int argc, char **argv)
                                quiet = 1;
                                continue;
                        }
+                       if (!memcmp(arg, "--prefix=", 9)) {
+                               base_dir = arg+9;
+                               continue;
+                       }
                }
-               checkout_file(arg);
+               checkout_file(arg, base_dir);
        }
        return 0;
 }