+/*
+ * Copyright (c) 2005, 2006 Rene Scharfe
+ */
#include <time.h>
#include "cache.h"
+#include "diff.h"
+#include "commit.h"
+#include "strbuf.h"
+#include "tar.h"
#define RECORDSIZE (512)
#define BLOCKSIZE (RECORDSIZE * 20)
-static const char *tar_tree_usage = "tar-tree <key> [basedir]";
+static const char tar_tree_usage[] = "git-tar-tree <key> [basedir]";
static char block[BLOCKSIZE];
static unsigned long offset;
-static const char *basedir;
static time_t archive_time;
-struct path_prefix {
- struct path_prefix *prev;
- const char *name;
-};
-
/* tries hard to write, either succeeds or dies in the attempt */
static void reliable_write(void *buf, unsigned long size)
{
while (size > 0) {
- long ret = write(1, buf, size);
+ long ret = xwrite(1, buf, size);
if (ret < 0) {
- if (errno == EAGAIN)
- continue;
if (errno == EPIPE)
exit(0);
- die("tar-tree: %s", strerror(errno));
+ die("git-tar-tree: %s", strerror(errno));
} else if (!ret) {
- die("tar-tree: disk full?");
+ die("git-tar-tree: disk full?");
}
size -= ret;
buf += ret;
}
}
+/* acquire the next record from the buffer; user must call write_if_needed() */
+static char *get_record(void)
+{
+ char *p = block + offset;
+ memset(p, 0, RECORDSIZE);
+ offset += RECORDSIZE;
+ return p;
+}
+
/*
* The end of tar archives is marked by 1024 nul bytes and after that
* follows the rest of the block (if any).
*/
static void write_trailer(void)
{
- memset(block + offset, 0, RECORDSIZE);
- offset += RECORDSIZE;
+ get_record();
write_if_needed();
- memset(block + offset, 0, RECORDSIZE);
- offset += RECORDSIZE;
+ get_record();
write_if_needed();
- if (offset) {
- memset(block + offset, 0, BLOCKSIZE - offset);
- reliable_write(block, BLOCKSIZE);
- offset = 0;
+ while (offset) {
+ get_record();
+ write_if_needed();
}
}
write_if_needed();
}
-static void append_string(char **p, const char *s)
-{
- unsigned int len = strlen(s);
- memcpy(*p, s, len);
- *p += len;
-}
-
-static void append_char(char **p, char c)
-{
- **p = c;
- *p += 1;
-}
-
-static void append_long(char **p, long n)
+static void strbuf_append_string(struct strbuf *sb, const char *s)
{
- int len = sprintf(*p, "%ld", n);
- *p += len;
+ int slen = strlen(s);
+ int total = sb->len + slen;
+ if (total > sb->alloc) {
+ sb->buf = xrealloc(sb->buf, total);
+ sb->alloc = total;
+ }
+ memcpy(sb->buf + sb->len, s, slen);
+ sb->len = total;
}
-static void append_path_prefix(char **buffer, struct path_prefix *prefix)
+/*
+ * pax extended header records have the format "%u %s=%s\n". %u contains
+ * the size of the whole string (including the %u), the first %s is the
+ * keyword, the second one is the value. This function constructs such a
+ * string and appends it to a struct strbuf.
+ */
+static void strbuf_append_ext_header(struct strbuf *sb, const char *keyword,
+ const char *value, unsigned int valuelen)
{
- if (!prefix)
- return;
- append_path_prefix(buffer, prefix->prev);
- append_string(buffer, prefix->name);
- append_char(buffer, '/');
-}
+ char *p;
+ int len, total, tmp;
-static unsigned int path_prefix_len(struct path_prefix *prefix)
-{
- if (!prefix)
- return 0;
- return path_prefix_len(prefix->prev) + strlen(prefix->name) + 1;
-}
+ /* "%u %s=%s\n" */
+ len = 1 + 1 + strlen(keyword) + 1 + valuelen + 1;
+ for (tmp = len; tmp > 9; tmp /= 10)
+ len++;
-static void append_path(char **p, int is_dir, const char *basepath,
- struct path_prefix *prefix, const char *path)
-{
- if (basepath) {
- append_string(p, basepath);
- append_char(p, '/');
+ total = sb->len + len;
+ if (total > sb->alloc) {
+ sb->buf = xrealloc(sb->buf, total);
+ sb->alloc = total;
}
- append_path_prefix(p, prefix);
- append_string(p, path);
- if (is_dir)
- append_char(p, '/');
-}
-static unsigned int path_len(int is_dir, const char *basepath,
- struct path_prefix *prefix, const char *path)
-{
- unsigned int len = 0;
- if (basepath)
- len += strlen(basepath) + 1;
- len += path_prefix_len(prefix) + strlen(path);
- if (is_dir)
- len++;
- return len;
+ p = sb->buf;
+ p += sprintf(p, "%u %s=", len, keyword);
+ memcpy(p, value, valuelen);
+ p += valuelen;
+ *p = '\n';
+ sb->len = total;
}
-static void write_header(const char *, char, const char *, struct path_prefix *,
- const char *, unsigned int, unsigned long);
-
-/* stores a pax extended header directly in the block buffer */
-static void write_extended_header(const char *headerfilename, int is_dir,
- const char *basepath,
- struct path_prefix *prefix,
- const char *path, unsigned int namelen)
+static unsigned int ustar_header_chksum(const struct ustar_header *header)
{
- char *p;
- unsigned int size = 1 + 6 + namelen + 1;
- if (size > 9)
- size++;
- if (size > 99)
- size++;
- if (size > RECORDSIZE)
- die("tar-tree: extended header too big, wtf?");
- write_header(NULL, 'x', NULL, NULL, headerfilename, 0100600, size);
- p = block + offset;
- memset(p, 0, RECORDSIZE);
- offset += RECORDSIZE;
- append_long(&p, size);
- append_string(&p, " path=");
- append_path(&p, is_dir, basepath, prefix, path);
- append_char(&p, '\n');
- write_if_needed();
+ char *p = (char *)header;
+ unsigned int chksum = 0;
+ while (p < header->chksum)
+ chksum += *p++;
+ chksum += sizeof(header->chksum) * ' ';
+ p += sizeof(header->chksum);
+ while (p < (char *)header + sizeof(struct ustar_header))
+ chksum += *p++;
+ return chksum;
}
-static void write_global_extended_header(const char *sha1)
+static int get_path_prefix(const struct strbuf *path, int maxlen)
{
- char *p;
- write_header(NULL, 'g', NULL, NULL, "pax_global_header", 0, 52);
- p = block + offset;
- memset(p, 0, RECORDSIZE);
- offset += RECORDSIZE;
- append_long(&p, 52); /* 2 + 9 + 40 + 1 */
- append_string(&p, " comment=");
- append_string(&p, sha1_to_hex(sha1));
- append_char(&p, '\n');
- write_if_needed();
+ int i = path->len;
+ if (i > maxlen)
+ i = maxlen;
+ while (i > 0 && path->buf[i] != '/')
+ i--;
+ return i;
}
-/* stores a ustar header directly in the block buffer */
-static void write_header(const char *sha1, char typeflag, const char *basepath,
- struct path_prefix *prefix, const char *path,
- unsigned int mode, unsigned long size)
+static void write_entry(const unsigned char *sha1, struct strbuf *path,
+ unsigned int mode, void *buffer, unsigned long size)
{
- unsigned int namelen;
- char *p, *header = NULL;
- unsigned int checksum = 0;
- int i;
-
- namelen = path_len(S_ISDIR(mode), basepath, prefix, path);
- if (namelen > 500) {
- die("tar-tree: name too log of object %s\n", sha1_to_hex(sha1));
- } else if (namelen > 100) {
- char *sha1_hex = sha1_to_hex(sha1);
- char headerfilename[51];
- sprintf(headerfilename, "%s.paxheader", sha1_hex);
- /* the extended header must be written before the normal one */
- write_extended_header(headerfilename, S_ISDIR(mode), basepath,
- prefix, path, namelen);
-
- header = block + offset;
- memset(header, 0, RECORDSIZE);
- offset += RECORDSIZE;
- sprintf(header, "%s.data", sha1_hex);
+ struct ustar_header header;
+ struct strbuf ext_header;
+
+ memset(&header, 0, sizeof(header));
+ ext_header.buf = NULL;
+ ext_header.len = ext_header.alloc = 0;
+
+ if (!sha1) {
+ *header.typeflag = TYPEFLAG_GLOBAL_HEADER;
+ mode = 0100666;
+ strcpy(header.name, "pax_global_header");
+ } else if (!path) {
+ *header.typeflag = TYPEFLAG_EXT_HEADER;
+ mode = 0100666;
+ sprintf(header.name, "%s.paxheader", sha1_to_hex(sha1));
} else {
- header = block + offset;
- memset(header, 0, RECORDSIZE);
- offset += RECORDSIZE;
- p = header;
- append_path(&p, S_ISDIR(mode), basepath, prefix, path);
+ if (S_ISDIR(mode)) {
+ *header.typeflag = TYPEFLAG_DIR;
+ mode |= 0777;
+ } else if (S_ISLNK(mode)) {
+ *header.typeflag = TYPEFLAG_LNK;
+ mode |= 0777;
+ } else if (S_ISREG(mode)) {
+ *header.typeflag = TYPEFLAG_REG;
+ mode |= (mode & 0100) ? 0777 : 0666;
+ } else {
+ error("unsupported file mode: 0%o (SHA1: %s)",
+ mode, sha1_to_hex(sha1));
+ return;
+ }
+ if (path->len > sizeof(header.name)) {
+ int plen = get_path_prefix(path, sizeof(header.prefix));
+ int rest = path->len - plen - 1;
+ if (plen > 0 && rest <= sizeof(header.name)) {
+ memcpy(header.prefix, path->buf, plen);
+ memcpy(header.name, path->buf + plen + 1, rest);
+ } else {
+ sprintf(header.name, "%s.data",
+ sha1_to_hex(sha1));
+ strbuf_append_ext_header(&ext_header, "path",
+ path->buf, path->len);
+ }
+ } else
+ memcpy(header.name, path->buf, path->len);
}
- if (S_ISDIR(mode))
- mode |= 0755; /* GIT doesn't store permissions of dirs */
- sprintf(&header[100], "%07o", mode & 07777);
-
- /* XXX: should we provide more meaningful info here? */
- sprintf(&header[108], "%07o", 0); /* uid */
- sprintf(&header[116], "%07o", 0); /* gid */
- strncpy(&header[265], "git", 31); /* uname */
- strncpy(&header[297], "git", 31); /* gname */
+ if (S_ISLNK(mode) && buffer) {
+ if (size > sizeof(header.linkname)) {
+ sprintf(header.linkname, "see %s.paxheader",
+ sha1_to_hex(sha1));
+ strbuf_append_ext_header(&ext_header, "linkpath",
+ buffer, size);
+ } else
+ memcpy(header.linkname, buffer, size);
+ }
- sprintf(&header[124], "%011lo", S_ISDIR(mode) ? 0 : size);
- sprintf(&header[136], "%011lo", archive_time);
+ sprintf(header.mode, "%07o", mode & 07777);
+ sprintf(header.size, "%011lo", S_ISREG(mode) ? size : 0);
+ sprintf(header.mtime, "%011lo", archive_time);
- header[156] = typeflag;
+ /* XXX: should we provide more meaningful info here? */
+ sprintf(header.uid, "%07o", 0);
+ sprintf(header.gid, "%07o", 0);
+ strncpy(header.uname, "git", 31);
+ strncpy(header.gname, "git", 31);
+ sprintf(header.devmajor, "%07o", 0);
+ sprintf(header.devminor, "%07o", 0);
- memcpy(&header[257], "ustar", 6);
- memcpy(&header[263], "00", 2);
+ memcpy(header.magic, "ustar", 6);
+ memcpy(header.version, "00", 2);
- printf(&header[329], "%07o", 0); /* devmajor */
- printf(&header[337], "%07o", 0); /* devminor */
+ sprintf(header.chksum, "%07o", ustar_header_chksum(&header));
- memset(&header[148], ' ', 8);
- for (i = 0; i < RECORDSIZE; i++)
- checksum += header[i];
- sprintf(&header[148], "%07o", checksum & 0x1fffff);
+ if (ext_header.len > 0) {
+ write_entry(sha1, NULL, 0, ext_header.buf, ext_header.len);
+ free(ext_header.buf);
+ }
+ write_blocked(&header, sizeof(header));
+ if (S_ISREG(mode) && buffer && size > 0)
+ write_blocked(buffer, size);
+}
- write_if_needed();
+static void write_global_extended_header(const unsigned char *sha1)
+{
+ struct strbuf ext_header;
+ ext_header.buf = NULL;
+ ext_header.len = ext_header.alloc = 0;
+ strbuf_append_ext_header(&ext_header, "comment", sha1_to_hex(sha1), 40);
+ write_entry(NULL, NULL, 0, ext_header.buf, ext_header.len);
+ free(ext_header.buf);
}
-static void traverse_tree(void *buffer, unsigned long size,
- struct path_prefix *prefix)
+static void traverse_tree(struct tree_desc *tree, struct strbuf *path)
{
- struct path_prefix this_prefix;
- this_prefix.prev = prefix;
+ int pathlen = path->len;
- while (size) {
- int namelen = strlen(buffer)+1;
+ while (tree->size) {
+ const char *name;
+ const unsigned char *sha1;
+ unsigned mode;
void *eltbuf;
char elttype[20];
unsigned long eltsize;
- unsigned char *sha1 = buffer + namelen;
- char *path = strchr(buffer, ' ') + 1;
- unsigned int mode;
- if (size < namelen + 20 || sscanf(buffer, "%o", &mode) != 1)
- die("corrupt 'tree' file");
- buffer = sha1 + 20;
- size -= namelen + 20;
+ sha1 = tree_entry_extract(tree, &name, &mode);
+ update_tree_entry(tree);
eltbuf = read_sha1_file(sha1, elttype, &eltsize);
if (!eltbuf)
die("cannot read %s", sha1_to_hex(sha1));
- write_header(sha1, S_ISDIR(mode) ? '5' : '0', basedir,
- prefix, path, mode, eltsize);
- if (!strcmp(elttype, "tree")) {
- this_prefix.name = path;
- traverse_tree(eltbuf, eltsize, &this_prefix);
- } else if (!strcmp(elttype, "blob")) {
- write_blocked(eltbuf, eltsize);
- }
- free(eltbuf);
- }
-}
-/* get commit time from committer line of commit object */
-time_t commit_time(void * buffer, unsigned long size)
-{
- time_t result = 0;
- char *p = buffer;
+ path->len = pathlen;
+ strbuf_append_string(path, name);
+ if (S_ISDIR(mode))
+ strbuf_append_string(path, "/");
- while (size > 0) {
- char *endp = memchr(p, '\n', size);
- if (!endp || endp == p)
- break;
- *endp = '\0';
- if (endp - p > 10 && !memcmp(p, "committer ", 10)) {
- char *nump = strrchr(p, '>');
- if (!nump)
- break;
- nump++;
- result = strtoul(nump, &endp, 10);
- if (*endp != ' ')
- result = 0;
- break;
+ write_entry(sha1, path, mode, eltbuf, eltsize);
+
+ if (S_ISDIR(mode)) {
+ struct tree_desc subtree;
+ subtree.buf = eltbuf;
+ subtree.size = eltsize;
+ traverse_tree(&subtree, path);
}
- size -= endp - p - 1;
- p = endp + 1;
+ free(eltbuf);
}
- return result;
}
int main(int argc, char **argv)
{
- unsigned char sha1[20];
- unsigned char commit_sha1[20];
- void *buffer;
- unsigned long size;
+ unsigned char sha1[20], tree_sha1[20];
+ struct commit *commit;
+ struct tree_desc tree;
+ struct strbuf current_path;
+
+ current_path.buf = xmalloc(PATH_MAX);
+ current_path.alloc = PATH_MAX;
+ current_path.len = current_path.eof = 0;
+
+ setup_git_directory();
+ git_config(git_default_config);
switch (argc) {
case 3:
- basedir = argv[2];
+ strbuf_append_string(¤t_path, argv[2]);
+ strbuf_append_string(¤t_path, "/");
/* FALLTHROUGH */
case 2:
- if (get_sha1_hex(argv[1], sha1) < 0)
+ if (get_sha1(argv[1], sha1) < 0)
usage(tar_tree_usage);
break;
default:
usage(tar_tree_usage);
}
- sha1_file_directory = getenv(DB_ENVIRONMENT);
- if (!sha1_file_directory)
- sha1_file_directory = DEFAULT_DB_ENVIRONMENT;
+ commit = lookup_commit_reference_gently(sha1, 1);
+ if (commit) {
+ write_global_extended_header(commit->object.sha1);
+ archive_time = commit->date;
+ } else
+ archive_time = time(NULL);
- buffer = read_object_with_reference(sha1, "commit", &size, commit_sha1);
- if (buffer) {
- write_global_extended_header(commit_sha1);
- archive_time = commit_time(buffer, size);
- free(buffer);
- }
- buffer = read_object_with_reference(sha1, "tree", &size, NULL);
- if (!buffer)
+ tree.buf = read_object_with_reference(sha1, "tree", &tree.size,
+ tree_sha1);
+ if (!tree.buf)
die("not a reference to a tag, commit or tree object: %s",
sha1_to_hex(sha1));
- if (!archive_time)
- archive_time = time(NULL);
- if (basedir)
- write_header("0", '5', NULL, NULL, basedir, 040755, 0);
- traverse_tree(buffer, size, NULL);
- free(buffer);
+
+ if (current_path.len > 0)
+ write_entry(tree_sha1, ¤t_path, 040777, NULL, 0);
+ traverse_tree(&tree, ¤t_path);
write_trailer();
+ free(current_path.buf);
return 0;
}