git-apply: war on whitespace -- finishing touches.
[gitweb.git] / sha1_file.c
index 66382027816e8ec3a97c40f6849c62454f2ad0f2..aa09b4646abff2f82d30c9968ae277d35db8c438 100644 (file)
@@ -6,8 +6,6 @@
  * This handles basic git sha1 object files - packing, unpacking,
  * creation etc.
  */
-#include <sys/types.h>
-#include <dirent.h>
 #include "cache.h"
 #include "delta.h"
 #include "pack.h"
@@ -20,6 +18,8 @@
 #endif
 #endif
 
+const unsigned char null_sha1[20] = { 0, };
+
 static unsigned int sha1_file_open_flag = O_NOATIME;
 
 static unsigned hexval(char c)
@@ -46,72 +46,57 @@ int get_sha1_hex(const char *hex, unsigned char *sha1)
        return 0;
 }
 
-static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir,
-       *git_graft_file;
-static void setup_git_env(void)
-{
-       git_dir = getenv(GIT_DIR_ENVIRONMENT);
-       if (!git_dir)
-               git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
-       git_object_dir = getenv(DB_ENVIRONMENT);
-       if (!git_object_dir) {
-               git_object_dir = xmalloc(strlen(git_dir) + 9);
-               sprintf(git_object_dir, "%s/objects", git_dir);
-       }
-       git_refs_dir = xmalloc(strlen(git_dir) + 6);
-       sprintf(git_refs_dir, "%s/refs", git_dir);
-       git_index_file = getenv(INDEX_ENVIRONMENT);
-       if (!git_index_file) {
-               git_index_file = xmalloc(strlen(git_dir) + 7);
-               sprintf(git_index_file, "%s/index", git_dir);
-       }
-       git_graft_file = getenv(GRAFT_ENVIRONMENT);
-       if (!git_graft_file)
-               git_graft_file = strdup(git_path("info/grafts"));
-}
-
-char *get_object_directory(void)
-{
-       if (!git_object_dir)
-               setup_git_env();
-       return git_object_dir;
-}
-
-char *get_refs_directory(void)
-{
-       if (!git_refs_dir)
-               setup_git_env();
-       return git_refs_dir;
-}
-
-char *get_index_file(void)
+int adjust_shared_perm(const char *path)
 {
-       if (!git_index_file)
-               setup_git_env();
-       return git_index_file;
-}
+       struct stat st;
+       int mode;
 
-char *get_graft_file(void)
-{
-       if (!git_graft_file)
-               setup_git_env();
-       return git_graft_file;
+       if (!shared_repository)
+               return 0;
+       if (lstat(path, &st) < 0)
+               return -1;
+       mode = st.st_mode;
+       if (mode & S_IRUSR)
+               mode |= S_IRGRP;
+       if (mode & S_IWUSR)
+               mode |= S_IWGRP;
+       if (mode & S_IXUSR)
+               mode |= S_IXGRP;
+       if (S_ISDIR(mode))
+               mode |= S_ISGID;
+       if (chmod(path, mode) < 0)
+               return -2;
+       return 0;
 }
 
 int safe_create_leading_directories(char *path)
 {
        char *pos = path;
+       struct stat st;
+
+       if (*pos == '/')
+               pos++;
 
        while (pos) {
                pos = strchr(pos, '/');
                if (!pos)
                        break;
                *pos = 0;
-               if (mkdir(path, 0777) < 0)
-                       if (errno != EEXIST) {
+               if (!stat(path, &st)) {
+                       /* path exists */
+                       if (!S_ISDIR(st.st_mode)) {
                                *pos = '/';
-                               return -1;
+                               return -3;
                        }
+               }
+               else if (mkdir(path, 0777)) {
+                       *pos = '/';
+                       return -1;
+               }
+               else if (adjust_shared_perm(path)) {
+                       *pos = '/';
+                       return -2;
+               }
                *pos++ = '/';
        }
        return 0;
@@ -129,6 +114,8 @@ char * sha1_to_hex(const unsigned char *sha1)
                *buf++ = hex[val >> 4];
                *buf++ = hex[val & 0xf];
        }
+       *buf = '\0';
+
        return buffer;
 }
 
@@ -232,8 +219,8 @@ static struct alternate_object_database **alt_odb_tail;
  * alternate_object_database.  The elements on this list come from
  * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
  * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
- * whose contents is exactly in the same format as that environment
- * variable.  Its base points at a statically allocated buffer that
+ * whose contents is similar to that environment variable but can be
+ * LF separated.  Its base points at a statically allocated buffer that
  * contains "/the/directory/corresponding/to/.git/objects/...", while
  * its name points just after the slash at the end of ".git/objects/"
  * in the example above, and has enough space to hold 40-byte hex
@@ -245,6 +232,7 @@ static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
 {
        const char *cp, *last;
        struct alternate_object_database *ent;
+       const char *objdir = get_object_directory();
        int base_len = -1;
 
        last = alt;
@@ -259,6 +247,8 @@ static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
                for ( ; cp < ep && *cp != sep; cp++)
                        ;
                if (last != cp) {
+                       struct stat st;
+                       struct alternate_object_database *alt;
                        /* 43 = 40-byte + 2 '/' + terminating NUL */
                        int pfxlen = cp - last;
                        int entlen = pfxlen + 43;
@@ -271,9 +261,7 @@ static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
                                pfxlen += base_len;
                        }
                        ent = xmalloc(sizeof(*ent) + entlen);
-                       *alt_odb_tail = ent;
-                       alt_odb_tail = &(ent->next);
-                       ent->next = NULL;
+
                        if (*last != '/' && relative_base) {
                                memcpy(ent->base, relative_base, base_len - 1);
                                ent->base[base_len - 1] = '/';
@@ -282,9 +270,35 @@ static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
                        }
                        else
                                memcpy(ent->base, last, pfxlen);
+
                        ent->name = ent->base + pfxlen + 1;
-                       ent->base[pfxlen] = ent->base[pfxlen + 3] = '/';
-                       ent->base[entlen-1] = 0;
+                       ent->base[pfxlen + 3] = '/';
+                       ent->base[pfxlen] = ent->base[entlen-1] = 0;
+
+                       /* Detect cases where alternate disappeared */
+                       if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) {
+                               error("object directory %s does not exist; "
+                                     "check .git/objects/info/alternates.",
+                                     ent->base);
+                               goto bad;
+                       }
+                       ent->base[pfxlen] = '/';
+
+                       /* Prevent the common mistake of listing the same
+                        * thing twice, or object directory itself.
+                        */
+                       for (alt = alt_odb_list; alt; alt = alt->next)
+                               if (!memcmp(ent->base, alt->base, pfxlen))
+                                       goto bad;
+                       if (!memcmp(ent->base, objdir, pfxlen)) {
+                       bad:
+                               free(ent);
+                       }
+                       else {
+                               *alt_odb_tail = ent;
+                               alt_odb_tail = &(ent->next);
+                               ent->next = NULL;
+                       }
                }
                while (cp < ep && *cp == sep)
                        cp++;
@@ -466,12 +480,13 @@ int use_packed_git(struct packed_git *p)
        return 0;
 }
 
-struct packed_git *add_packed_git(char *path, int path_len)
+struct packed_git *add_packed_git(char *path, int path_len, int local)
 {
        struct stat st;
        struct packed_git *p;
        unsigned long idx_size;
        void *idx_map;
+       unsigned char sha1[20];
 
        if (check_packed_git_idx(path, &idx_size, &idx_map))
                return NULL;
@@ -494,6 +509,9 @@ struct packed_git *add_packed_git(char *path, int path_len)
        p->pack_base = NULL;
        p->pack_last_used = 0;
        p->pack_use_cnt = 0;
+       p->pack_local = local;
+       if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1))
+               memcpy(p->sha1, sha1, 20);
        return p;
 }
 
@@ -534,7 +552,7 @@ void install_packed_git(struct packed_git *pack)
        packed_git = pack;
 }
 
-static void prepare_packed_git_one(char *objdir)
+static void prepare_packed_git_one(char *objdir, int local)
 {
        char path[PATH_MAX];
        int len;
@@ -544,8 +562,12 @@ static void prepare_packed_git_one(char *objdir)
        sprintf(path, "%s/pack", objdir);
        len = strlen(path);
        dir = opendir(path);
-       if (!dir)
+       if (!dir) {
+               if (errno != ENOENT)
+                       error("unable to open object pack directory: %s: %s",
+                             path, strerror(errno));
                return;
+       }
        path[len++] = '/';
        while ((de = readdir(dir)) != NULL) {
                int namelen = strlen(de->d_name);
@@ -556,7 +578,7 @@ static void prepare_packed_git_one(char *objdir)
 
                /* we have .idx.  Is it a file we can map? */
                strcpy(path + len, de->d_name);
-               p = add_packed_git(path, len + namelen);
+               p = add_packed_git(path, len + namelen, local);
                if (!p)
                        continue;
                p->next = packed_git;
@@ -572,11 +594,12 @@ void prepare_packed_git(void)
 
        if (run_once)
                return;
-       prepare_packed_git_one(get_object_directory());
+       prepare_packed_git_one(get_object_directory(), 1);
        prepare_alt_odb();
        for (alt = alt_odb_list; alt; alt = alt->next) {
-               alt->name[0] = 0;
-               prepare_packed_git_one(alt->base);
+               alt->name[-1] = 0;
+               prepare_packed_git_one(alt->base, 0);
+               alt->name[-1] = '/';
        }
        run_once = 1;
 }
@@ -818,6 +841,25 @@ static unsigned long unpack_object_header(struct packed_git *p, unsigned long of
        return offset;
 }
 
+int check_reuse_pack_delta(struct packed_git *p, unsigned long offset,
+                          unsigned char *base, unsigned long *sizep,
+                          enum object_type *kindp)
+{
+       unsigned long ptr;
+       int status = -1;
+
+       use_packed_git(p);
+       ptr = offset;
+       ptr = unpack_object_header(p, ptr, kindp, sizep);
+       if (*kindp != OBJ_DELTA)
+               goto done;
+       memcpy(base, p->pack_base + ptr, 20);
+       status = 0;
+ done:
+       unuse_packed_git(p);
+       return status;
+}
+
 void packed_object_info_detail(struct pack_entry *e,
                               char *type,
                               unsigned long *size,
@@ -864,7 +906,8 @@ void packed_object_info_detail(struct pack_entry *e,
                strcpy(type, "tag");
                break;
        default:
-               die("corrupted pack file");
+               die("corrupted pack file %s containing object of kind %d",
+                   p->pack_name, kind);
        }
        *store_size = 0; /* notyet */
 }
@@ -903,7 +946,8 @@ static int packed_object_info(struct pack_entry *entry,
                strcpy(type, "tag");
                break;
        default:
-               die("corrupted pack file");
+               die("corrupted pack file %s containing object of kind %d",
+                   p->pack_name, kind);
        }
        if (sizep)
                *sizep = size;
@@ -1003,7 +1047,7 @@ static void *unpack_entry(struct pack_entry *entry,
        retval = unpack_entry_gently(entry, type, sizep);
        unuse_packed_git(p);
        if (!retval)
-               die("corrupted pack file");
+               die("corrupted pack file %s", p->pack_name);
        return retval;
 }
 
@@ -1237,6 +1281,79 @@ char *write_sha1_file_prepare(void *buf,
        return sha1_file_name(sha1);
 }
 
+/*
+ * Link the tempfile to the final place, possibly creating the
+ * last directory level as you do so.
+ *
+ * Returns the errno on failure, 0 on success.
+ */
+static int link_temp_to_file(const char *tmpfile, char *filename)
+{
+       int ret;
+
+       if (!link(tmpfile, filename))
+               return 0;
+
+       /*
+        * Try to mkdir the last path component if that failed
+        * with an ENOENT.
+        *
+        * Re-try the "link()" regardless of whether the mkdir
+        * succeeds, since a race might mean that somebody
+        * else succeeded.
+        */
+       ret = errno;
+       if (ret == ENOENT) {
+               char *dir = strrchr(filename, '/');
+               if (dir) {
+                       *dir = 0;
+                       mkdir(filename, 0777);
+                       if (adjust_shared_perm(filename))
+                               return -2;
+                       *dir = '/';
+                       if (!link(tmpfile, filename))
+                               return 0;
+                       ret = errno;
+               }
+       }
+       return ret;
+}
+
+/*
+ * Move the just written object into its final resting place
+ */
+int move_temp_to_file(const char *tmpfile, char *filename)
+{
+       int ret = link_temp_to_file(tmpfile, filename);
+
+       /*
+        * Coda hack - coda doesn't like cross-directory links,
+        * so we fall back to a rename, which will mean that it
+        * won't be able to check collisions, but that's not a
+        * big deal.
+        *
+        * The same holds for FAT formatted media.
+        *
+        * When this succeeds, we just return 0. We have nothing
+        * left to unlink.
+        */
+       if (ret && ret != EEXIST) {
+               if (!rename(tmpfile, filename))
+                       return 0;
+               ret = errno;
+       }
+       unlink(tmpfile);
+       if (ret) {
+               if (ret != EEXIST) {
+                       fprintf(stderr, "unable to write sha1 filename %s: %s\n", filename, strerror(ret));
+                       return -1;
+               }
+               /* FIXME!!! Collision check here ? */
+       }
+
+       return 0;
+}
+
 int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
 {
        int size;
@@ -1246,7 +1363,7 @@ int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned cha
        char *filename;
        static char tmpfile[PATH_MAX];
        unsigned char hdr[50];
-       int fd, hdrlen, ret;
+       int fd, hdrlen;
 
        /* Normally if we have it in the pack then we do not bother writing
         * it out into .git/objects/??/?{38} file.
@@ -1267,7 +1384,7 @@ int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned cha
        }
 
        if (errno != ENOENT) {
-               fprintf(stderr, "sha1 file %s: %s", filename, strerror(errno));
+               fprintf(stderr, "sha1 file %s: %s\n", filename, strerror(errno));
                return -1;
        }
 
@@ -1275,7 +1392,7 @@ int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned cha
 
        fd = mkstemp(tmpfile);
        if (fd < 0) {
-               fprintf(stderr, "unable to create temporary sha1 filename %s: %s", tmpfile, strerror(errno));
+               fprintf(stderr, "unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
                return -1;
        }
 
@@ -1309,32 +1426,7 @@ int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned cha
        close(fd);
        free(compressed);
 
-       ret = link(tmpfile, filename);
-       if (ret < 0) {
-               ret = errno;
-
-               /*
-                * Coda hack - coda doesn't like cross-directory links,
-                * so we fall back to a rename, which will mean that it
-                * won't be able to check collisions, but that's not a
-                * big deal.
-                *
-                * When this succeeds, we just return 0. We have nothing
-                * left to unlink.
-                */
-               if (ret == EXDEV && !rename(tmpfile, filename))
-                       return 0;
-       }
-       unlink(tmpfile);
-       if (ret) {
-               if (ret != EEXIST) {
-                       fprintf(stderr, "unable to write sha1 filename %s: %s", filename, strerror(ret));
-                       return -1;
-               }
-               /* FIXME!!! Collision check here ? */
-       }
-
-       return 0;
+       return move_temp_to_file(tmpfile, filename);
 }
 
 int write_sha1_to_fd(int fd, const unsigned char *sha1)
@@ -1389,7 +1481,7 @@ int write_sha1_to_fd(int fd, const unsigned char *sha1)
                size = write(fd, buf + posn, objsize - posn);
                if (size <= 0) {
                        if (!size) {
-                               fprintf(stderr, "write closed");
+                               fprintf(stderr, "write closed\n");
                        } else {
                                perror("write ");
                        }
@@ -1409,8 +1501,7 @@ int write_sha1_to_fd(int fd, const unsigned char *sha1)
 int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
                       size_t bufsize, size_t *bufposn)
 {
-       char *filename = sha1_file_name(sha1);
-
+       char tmpfile[PATH_MAX];
        int local;
        z_stream stream;
        unsigned char real_sha1[20];
@@ -1418,10 +1509,12 @@ int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
        int ret;
        SHA_CTX c;
 
-       local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
+       snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
 
+       local = mkstemp(tmpfile);
        if (local < 0)
-               return error("Couldn't open %s\n", filename);
+               return error("Couldn't open %s for %s",
+                            tmpfile, sha1_to_hex(sha1));
 
        memset(&stream, 0, sizeof(stream));
 
@@ -1451,7 +1544,7 @@ int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
                size = read(fd, buffer + *bufposn, bufsize - *bufposn);
                if (size <= 0) {
                        close(local);
-                       unlink(filename);
+                       unlink(tmpfile);
                        if (!size)
                                return error("Connection closed?");
                        perror("Reading from connection");
@@ -1464,15 +1557,15 @@ int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
        close(local);
        SHA1_Final(real_sha1, &c);
        if (ret != Z_STREAM_END) {
-               unlink(filename);
+               unlink(tmpfile);
                return error("File %s corrupted", sha1_to_hex(sha1));
        }
        if (memcmp(sha1, real_sha1, 20)) {
-               unlink(filename);
-               return error("File %s has bad hash\n", sha1_to_hex(sha1));
+               unlink(tmpfile);
+               return error("File %s has bad hash", sha1_to_hex(sha1));
        }
-       
-       return 0;
+
+       return move_temp_to_file(tmpfile, sha1_file_name(sha1));
 }
 
 int has_pack_index(const unsigned char *sha1)
@@ -1507,6 +1600,40 @@ int has_sha1_file(const unsigned char *sha1)
        return find_sha1_file(sha1, &st) ? 1 : 0;
 }
 
+int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
+{
+       unsigned long size = 4096;
+       char *buf = malloc(size);
+       int iret, ret;
+       unsigned long off = 0;
+       unsigned char hdr[50];
+       int hdrlen;
+       do {
+               iret = read(fd, buf + off, size - off);
+               if (iret > 0) {
+                       off += iret;
+                       if (off == size) {
+                               size *= 2;
+                               buf = realloc(buf, size);
+                       }
+               }
+       } while (iret > 0);
+       if (iret < 0) {
+               free(buf);
+               return -1;
+       }
+       if (!type)
+               type = "blob";
+       if (write_object)
+               ret = write_sha1_file(buf, off, type, sha1);
+       else {
+               write_sha1_file_prepare(buf, off, type, sha1, hdr, &hdrlen);
+               ret = 0;
+       }
+       free(buf);
+       return ret;
+}
+
 int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type)
 {
        unsigned long size = st->st_size;
@@ -1534,3 +1661,42 @@ int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, con
                munmap(buf, size);
        return ret;
 }
+
+int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object)
+{
+       int fd;
+       char *target;
+
+       switch (st->st_mode & S_IFMT) {
+       case S_IFREG:
+               fd = open(path, O_RDONLY);
+               if (fd < 0)
+                       return error("open(\"%s\"): %s", path,
+                                    strerror(errno));
+               if (index_fd(sha1, fd, st, write_object, NULL) < 0)
+                       return error("%s: failed to insert into database",
+                                    path);
+               break;
+       case S_IFLNK:
+               target = xmalloc(st->st_size+1);
+               if (readlink(path, target, st->st_size+1) != st->st_size) {
+                       char *errstr = strerror(errno);
+                       free(target);
+                       return error("readlink(\"%s\"): %s", path,
+                                    errstr);
+               }
+               if (!write_object) {
+                       unsigned char hdr[50];
+                       int hdrlen;
+                       write_sha1_file_prepare(target, st->st_size, "blob",
+                                               sha1, hdr, &hdrlen);
+               } else if (write_sha1_file(target, st->st_size, "blob", sha1))
+                       return error("%s: failed to insert into database",
+                                    path);
+               free(target);
+               break;
+       default:
+               return error("%s: unsupported file type", path);
+       }
+       return 0;
+}