+/*
+ * Copyright (c) 2005 Rene Scharfe
+ */
#include <time.h>
#include "cache.h"
+#include "diff.h"
+#include "commit.h"
#define RECORDSIZE (512)
#define BLOCKSIZE (RECORDSIZE * 20)
-static const char *tar_tree_usage = "tar-tree <key> [basedir]";
+#define TYPEFLAG_AUTO '\0'
+#define TYPEFLAG_REG '0'
+#define TYPEFLAG_LNK '2'
+#define TYPEFLAG_DIR '5'
+#define TYPEFLAG_GLOBAL_HEADER 'g'
+#define TYPEFLAG_EXT_HEADER 'x'
+
+#define EXT_HEADER_PATH 1
+#define EXT_HEADER_LINKPATH 2
+
+static const char tar_tree_usage[] = "git-tar-tree <key> [basedir]";
static char block[BLOCKSIZE];
static unsigned long offset;
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;
*/
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();
}
}
*p += 1;
}
-static void append_long(char **p, long n)
-{
- int len = sprintf(*p, "%ld", n);
- *p += len;
-}
-
static void append_path_prefix(char **buffer, struct path_prefix *prefix)
{
if (!prefix)
return len;
}
-static void write_header(const char *, char, const char *, struct path_prefix *,
- const char *, unsigned int, unsigned long);
+static void append_extended_header_prefix(char **p, unsigned int size,
+ const char *keyword)
+{
+ int len = sprintf(*p, "%u %s=", size, keyword);
+ *p += len;
+}
+
+static unsigned int extended_header_len(const char *keyword,
+ unsigned int valuelen)
+{
+ /* "%u %s=%s\n" */
+ unsigned int len = 1 + 1 + strlen(keyword) + 1 + valuelen + 1;
+ if (len > 9)
+ len++;
+ if (len > 99)
+ len++;
+ return len;
+}
+
+static void append_extended_header(char **p, const char *keyword,
+ const char *value, unsigned int len)
+{
+ unsigned int size = extended_header_len(keyword, len);
+ append_extended_header_prefix(p, size, keyword);
+ memcpy(*p, value, len);
+ *p += len;
+ append_char(p, '\n');
+}
+
+static void write_header(const unsigned char *, char, const char *, struct path_prefix *,
+ const char *, unsigned int, void *, 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,
+ unsigned int flags, const char *basepath,
struct path_prefix *prefix,
- const char *path, unsigned int namelen)
+ const char *path, unsigned int namelen,
+ void *content, unsigned int contentsize)
{
- 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 = get_record();
- append_long(&p, size);
- append_string(&p, " path=");
+ char *buffer, *p;
+ unsigned int pathlen, size, linkpathlen = 0;
+
+ size = pathlen = extended_header_len("path", namelen);
+ if (flags & EXT_HEADER_LINKPATH) {
+ linkpathlen = extended_header_len("linkpath", contentsize);
+ size += linkpathlen;
+ }
+ write_header(NULL, TYPEFLAG_EXT_HEADER, NULL, NULL, headerfilename,
+ 0100600, NULL, size);
+
+ buffer = p = malloc(size);
+ if (!buffer)
+ die("git-tar-tree: %s", strerror(errno));
+ append_extended_header_prefix(&p, pathlen, "path");
append_path(&p, is_dir, basepath, prefix, path);
append_char(&p, '\n');
- write_if_needed();
+ if (flags & EXT_HEADER_LINKPATH)
+ append_extended_header(&p, "linkpath", content, contentsize);
+ write_blocked(buffer, size);
+ free(buffer);
}
-static void write_global_extended_header(const char *sha1)
+static void write_global_extended_header(const unsigned char *sha1)
{
char *p;
- write_header(NULL, 'g', NULL, NULL, "pax_global_header", 0, 52);
+ unsigned int size;
+
+ size = extended_header_len("comment", 40);
+ write_header(NULL, TYPEFLAG_GLOBAL_HEADER, NULL, NULL,
+ "pax_global_header", 0100600, NULL, size);
+
p = get_record();
- append_long(&p, 52); /* 2 + 9 + 40 + 1 */
- append_string(&p, " comment=");
- append_string(&p, sha1_to_hex(sha1));
- append_char(&p, '\n');
+ append_extended_header(&p, "comment", sha1_to_hex(sha1), 40);
write_if_needed();
}
/* stores a ustar header directly in the block buffer */
-static void write_header(const char *sha1, char typeflag, const char *basepath,
+static void write_header(const unsigned char *sha1, char typeflag, const char *basepath,
struct path_prefix *prefix, const char *path,
- unsigned int mode, unsigned long size)
+ unsigned int mode, void *buffer, unsigned long size)
{
unsigned int namelen;
- char *p, *header = NULL;
+ char *header = NULL;
unsigned int checksum = 0;
int i;
+ unsigned int ext_header = 0;
+
+ if (typeflag == TYPEFLAG_AUTO) {
+ if (S_ISDIR(mode))
+ typeflag = TYPEFLAG_DIR;
+ else if (S_ISLNK(mode))
+ typeflag = TYPEFLAG_LNK;
+ else
+ typeflag = TYPEFLAG_REG;
+ }
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);
+ if (namelen > 100)
+ ext_header |= EXT_HEADER_PATH;
+ if (typeflag == TYPEFLAG_LNK && size > 100)
+ ext_header |= EXT_HEADER_LINKPATH;
+
+ /* the extended header must be written before the normal one */
+ if (ext_header) {
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);
+ sprintf(headerfilename, "%s.paxheader", sha1_to_hex(sha1));
+ write_extended_header(headerfilename, S_ISDIR(mode),
+ ext_header, basepath, prefix, path,
+ namelen, buffer, size);
+ }
+
+ header = get_record();
- header = get_record();
- sprintf(header, "%s.data", sha1_hex);
+ if (ext_header) {
+ sprintf(header, "%s.data", sha1_to_hex(sha1));
} else {
- p = header = get_record();
+ char *p = header;
append_path(&p, S_ISDIR(mode), basepath, prefix, path);
}
+ if (typeflag == TYPEFLAG_LNK) {
+ if (ext_header & EXT_HEADER_LINKPATH) {
+ sprintf(&header[157], "see %s.paxheader",
+ sha1_to_hex(sha1));
+ } else {
+ if (buffer)
+ strncpy(&header[157], buffer, size);
+ }
+ }
+
if (S_ISDIR(mode))
- mode |= 0755; /* GIT doesn't store permissions of dirs */
+ mode |= 0777;
+ else if (S_ISREG(mode))
+ mode |= (mode & 0100) ? 0777 : 0666;
+ else if (S_ISLNK(mode))
+ mode |= 0777;
sprintf(&header[100], "%07o", mode & 07777);
/* XXX: should we provide more meaningful info here? */
strncpy(&header[265], "git", 31); /* uname */
strncpy(&header[297], "git", 31); /* gname */
- sprintf(&header[124], "%011lo", S_ISDIR(mode) ? 0 : size);
+ if (S_ISDIR(mode) || S_ISLNK(mode))
+ size = 0;
+ sprintf(&header[124], "%011lo", size);
sprintf(&header[136], "%011lo", archive_time);
header[156] = typeflag;
memcpy(&header[257], "ustar", 6);
memcpy(&header[263], "00", 2);
- printf(&header[329], "%07o", 0); /* devmajor */
- printf(&header[337], "%07o", 0); /* devminor */
+ sprintf(&header[329], "%07o", 0); /* devmajor */
+ sprintf(&header[337], "%07o", 0); /* devminor */
memset(&header[148], ' ', 8);
for (i = 0; i < RECORDSIZE; i++)
write_if_needed();
}
-static void traverse_tree(void *buffer, unsigned long size,
+static void traverse_tree(struct tree_desc *tree,
struct path_prefix *prefix)
{
struct path_prefix this_prefix;
this_prefix.prev = prefix;
- 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_header(sha1, TYPEFLAG_AUTO, basedir,
+ prefix, name, mode, eltbuf, eltsize);
+ if (S_ISDIR(mode)) {
+ struct tree_desc subtree;
+ subtree.buf = eltbuf;
+ subtree.size = eltsize;
+ this_prefix.name = name;
+ traverse_tree(&subtree, &this_prefix);
+ } else if (!S_ISLNK(mode)) {
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;
-
- 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;
- }
- size -= endp - p - 1;
- p = endp + 1;
- }
- return result;
-}
-
int main(int argc, char **argv)
{
unsigned char sha1[20];
- unsigned char commit_sha1[20];
- void *buffer;
- unsigned long size;
+ struct commit *commit;
+ struct tree_desc tree;
+
+ setup_git_directory();
switch (argc) {
case 3:
usage(tar_tree_usage);
}
- sha1_file_directory = getenv(DB_ENVIRONMENT);
- if (!sha1_file_directory)
- sha1_file_directory = DEFAULT_DB_ENVIRONMENT;
-
- 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);
+ commit = lookup_commit_reference_gently(sha1, 1);
+ if (commit) {
+ write_global_extended_header(commit->object.sha1);
+ archive_time = commit->date;
}
- buffer = read_object_with_reference(sha1, "tree", &size, NULL);
- if (!buffer)
+ tree.buf = read_object_with_reference(sha1, "tree", &tree.size, NULL);
+ 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);
+ write_header((unsigned char *)"0", TYPEFLAG_DIR, NULL, NULL,
+ basedir, 040777, NULL, 0);
+ traverse_tree(&tree, NULL);
write_trailer();
return 0;
}
projects / git.git / blobdiff