#include "cache.h"
#include "tar.h"
#include "archive.h"
+#include "streaming.h"
+#include "run-command.h"
#define RECORDSIZE (512)
#define BLOCKSIZE (RECORDSIZE * 20)
static int tar_umask = 002;
+static int write_tar_filter_archive(const struct archiver *ar,
+ struct archiver_args *args);
+
/* writes out the whole block, but only if it is full */
static void write_if_needed(void)
{
* queues up writes, so that all our write(2) calls write exactly one
* full block; pads writes to RECORDSIZE
*/
-static void write_blocked(const void *data, unsigned long size)
+static void do_write_blocked(const void *data, unsigned long size)
{
const char *buf = data;
- unsigned long tail;
if (offset) {
unsigned long chunk = BLOCKSIZE - offset;
memcpy(block + offset, buf, size);
offset += size;
}
+}
+
+static void finish_record(void)
+{
+ unsigned long tail;
tail = offset % RECORDSIZE;
if (tail) {
memset(block + offset, 0, RECORDSIZE - tail);
write_if_needed();
}
+static void write_blocked(const void *data, unsigned long size)
+{
+ do_write_blocked(data, size);
+ finish_record();
+}
+
/*
* The end of tar archives is marked by 2*512 nul bytes and after that
* follows the rest of the block (if any).
}
}
+/*
+ * queues up writes, so that all our write(2) calls write exactly one
+ * full block; pads writes to RECORDSIZE
+ */
+static int stream_blocked(const unsigned char *sha1)
+{
+ struct git_istream *st;
+ enum object_type type;
+ unsigned long sz;
+ char buf[BLOCKSIZE];
+ ssize_t readlen;
+
+ st = open_istream(sha1, &type, &sz, NULL);
+ if (!st)
+ return error("cannot stream blob %s", sha1_to_hex(sha1));
+ for (;;) {
+ readlen = read_istream(st, buf, sizeof(buf));
+ if (readlen <= 0)
+ break;
+ do_write_blocked(buf, readlen);
+ }
+ close_istream(st);
+ if (!readlen)
+ finish_record();
+ return readlen;
+}
+
/*
* 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
static unsigned int ustar_header_chksum(const struct ustar_header *header)
{
- char *p = (char *)header;
+ const char *p = (const 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))
+ while (p < (const char *)header + sizeof(struct ustar_header))
chksum += *p++;
return chksum;
}
return i;
}
+static void prepare_header(struct archiver_args *args,
+ struct ustar_header *header,
+ unsigned int mode, unsigned long size)
+{
+ sprintf(header->mode, "%07o", mode & 07777);
+ sprintf(header->size, "%011lo", S_ISREG(mode) ? size : 0);
+ sprintf(header->mtime, "%011lo", (unsigned long) args->time);
+
+ sprintf(header->uid, "%07o", 0);
+ sprintf(header->gid, "%07o", 0);
+ strlcpy(header->uname, "root", sizeof(header->uname));
+ strlcpy(header->gname, "root", sizeof(header->gname));
+ sprintf(header->devmajor, "%07o", 0);
+ sprintf(header->devminor, "%07o", 0);
+
+ memcpy(header->magic, "ustar", 6);
+ memcpy(header->version, "00", 2);
+
+ sprintf(header->chksum, "%07o", ustar_header_chksum(header));
+}
+
+static int write_extended_header(struct archiver_args *args,
+ const unsigned char *sha1,
+ const void *buffer, unsigned long size)
+{
+ struct ustar_header header;
+ unsigned int mode;
+ memset(&header, 0, sizeof(header));
+ *header.typeflag = TYPEFLAG_EXT_HEADER;
+ mode = 0100666;
+ sprintf(header.name, "%s.paxheader", sha1_to_hex(sha1));
+ prepare_header(args, &header, mode, size);
+ write_blocked(&header, sizeof(header));
+ write_blocked(buffer, size);
+ return 0;
+}
+
static int write_tar_entry(struct archiver_args *args,
- const unsigned char *sha1, const char *path, size_t pathlen,
- unsigned int mode, void *buffer, unsigned long size)
+ const unsigned char *sha1,
+ const char *path, size_t pathlen,
+ unsigned int mode)
{
struct ustar_header header;
struct strbuf ext_header = STRBUF_INIT;
+ unsigned int old_mode = mode;
+ unsigned long size;
+ void *buffer;
int err = 0;
memset(&header, 0, sizeof(header));
- 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));
+ if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
+ *header.typeflag = TYPEFLAG_DIR;
+ mode = (mode | 0777) & ~tar_umask;
+ } else if (S_ISLNK(mode)) {
+ *header.typeflag = TYPEFLAG_LNK;
+ mode |= 0777;
+ } else if (S_ISREG(mode)) {
+ *header.typeflag = TYPEFLAG_REG;
+ mode = (mode | ((mode & 0100) ? 0777 : 0666)) & ~tar_umask;
} else {
- if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
- *header.typeflag = TYPEFLAG_DIR;
- mode = (mode | 0777) & ~tar_umask;
- } else if (S_ISLNK(mode)) {
- *header.typeflag = TYPEFLAG_LNK;
- mode |= 0777;
- } else if (S_ISREG(mode)) {
- *header.typeflag = TYPEFLAG_REG;
- mode = (mode | ((mode & 0100) ? 0777 : 0666)) & ~tar_umask;
+ return error("unsupported file mode: 0%o (SHA1: %s)",
+ mode, sha1_to_hex(sha1));
+ }
+ if (pathlen > sizeof(header.name)) {
+ size_t plen = get_path_prefix(path, pathlen,
+ sizeof(header.prefix));
+ size_t rest = pathlen - plen - 1;
+ if (plen > 0 && rest <= sizeof(header.name)) {
+ memcpy(header.prefix, path, plen);
+ memcpy(header.name, path + plen + 1, rest);
} else {
- return error("unsupported file mode: 0%o (SHA1: %s)",
- mode, sha1_to_hex(sha1));
+ sprintf(header.name, "%s.data",
+ sha1_to_hex(sha1));
+ strbuf_append_ext_header(&ext_header, "path",
+ path, pathlen);
}
- if (pathlen > sizeof(header.name)) {
- size_t plen = get_path_prefix(path, pathlen,
- sizeof(header.prefix));
- size_t rest = pathlen - plen - 1;
- if (plen > 0 && rest <= sizeof(header.name)) {
- memcpy(header.prefix, path, plen);
- memcpy(header.name, path + plen + 1, rest);
- } else {
- sprintf(header.name, "%s.data",
- sha1_to_hex(sha1));
- strbuf_append_ext_header(&ext_header, "path",
- path, pathlen);
- }
- } else
- memcpy(header.name, path, pathlen);
+ } else
+ memcpy(header.name, path, pathlen);
+
+ if (S_ISREG(mode) && !args->convert &&
+ sha1_object_info(sha1, &size) == OBJ_BLOB &&
+ size > big_file_threshold)
+ buffer = NULL;
+ else if (S_ISLNK(mode) || S_ISREG(mode)) {
+ enum object_type type;
+ buffer = sha1_file_to_archive(args, path, sha1, old_mode, &type, &size);
+ if (!buffer)
+ return error("cannot read %s", sha1_to_hex(sha1));
+ } else {
+ buffer = NULL;
+ size = 0;
}
- if (S_ISLNK(mode) && buffer) {
+ if (S_ISLNK(mode)) {
if (size > sizeof(header.linkname)) {
sprintf(header.linkname, "see %s.paxheader",
sha1_to_hex(sha1));
memcpy(header.linkname, buffer, size);
}
- sprintf(header.mode, "%07o", mode & 07777);
- sprintf(header.size, "%011lo", S_ISREG(mode) ? size : 0);
- sprintf(header.mtime, "%011lo", (unsigned long) args->time);
-
- sprintf(header.uid, "%07o", 0);
- sprintf(header.gid, "%07o", 0);
- strlcpy(header.uname, "root", sizeof(header.uname));
- strlcpy(header.gname, "root", sizeof(header.gname));
- sprintf(header.devmajor, "%07o", 0);
- sprintf(header.devminor, "%07o", 0);
-
- memcpy(header.magic, "ustar", 6);
- memcpy(header.version, "00", 2);
-
- sprintf(header.chksum, "%07o", ustar_header_chksum(&header));
+ prepare_header(args, &header, mode, size);
if (ext_header.len > 0) {
- err = write_tar_entry(args, sha1, NULL, 0, 0, ext_header.buf,
- ext_header.len);
- if (err)
+ err = write_extended_header(args, sha1, ext_header.buf,
+ ext_header.len);
+ if (err) {
+ free(buffer);
return err;
+ }
}
strbuf_release(&ext_header);
write_blocked(&header, sizeof(header));
- if (S_ISREG(mode) && buffer && size > 0)
- write_blocked(buffer, size);
+ if (S_ISREG(mode) && size > 0) {
+ if (buffer)
+ write_blocked(buffer, size);
+ else
+ err = stream_blocked(sha1);
+ }
+ free(buffer);
return err;
}
{
const unsigned char *sha1 = args->commit_sha1;
struct strbuf ext_header = STRBUF_INIT;
- int err;
+ struct ustar_header header;
+ unsigned int mode;
+ int err = 0;
strbuf_append_ext_header(&ext_header, "comment", sha1_to_hex(sha1), 40);
- err = write_tar_entry(args, NULL, NULL, 0, 0, ext_header.buf,
- ext_header.len);
+ memset(&header, 0, sizeof(header));
+ *header.typeflag = TYPEFLAG_GLOBAL_HEADER;
+ mode = 0100666;
+ strcpy(header.name, "pax_global_header");
+ prepare_header(args, &header, mode, ext_header.len);
+ write_blocked(&header, sizeof(header));
+ write_blocked(ext_header.buf, ext_header.len);
strbuf_release(&ext_header);
return err;
}
+static struct archiver **tar_filters;
+static int nr_tar_filters;
+static int alloc_tar_filters;
+
+static struct archiver *find_tar_filter(const char *name, int len)
+{
+ int i;
+ for (i = 0; i < nr_tar_filters; i++) {
+ struct archiver *ar = tar_filters[i];
+ if (!strncmp(ar->name, name, len) && !ar->name[len])
+ return ar;
+ }
+ return NULL;
+}
+
+static int tar_filter_config(const char *var, const char *value, void *data)
+{
+ struct archiver *ar;
+ const char *dot;
+ const char *name;
+ const char *type;
+ int namelen;
+
+ if (prefixcmp(var, "tar."))
+ return 0;
+ dot = strrchr(var, '.');
+ if (dot == var + 9)
+ return 0;
+
+ name = var + 4;
+ namelen = dot - name;
+ type = dot + 1;
+
+ ar = find_tar_filter(name, namelen);
+ if (!ar) {
+ ar = xcalloc(1, sizeof(*ar));
+ ar->name = xmemdupz(name, namelen);
+ ar->write_archive = write_tar_filter_archive;
+ ar->flags = ARCHIVER_WANT_COMPRESSION_LEVELS;
+ ALLOC_GROW(tar_filters, nr_tar_filters + 1, alloc_tar_filters);
+ tar_filters[nr_tar_filters++] = ar;
+ }
+
+ if (!strcmp(type, "command")) {
+ if (!value)
+ return config_error_nonbool(var);
+ free(ar->data);
+ ar->data = xstrdup(value);
+ return 0;
+ }
+ if (!strcmp(type, "remote")) {
+ if (git_config_bool(var, value))
+ ar->flags |= ARCHIVER_REMOTE;
+ else
+ ar->flags &= ~ARCHIVER_REMOTE;
+ return 0;
+ }
+
+ return 0;
+}
+
static int git_tar_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "tar.umask")) {
}
return 0;
}
- return git_default_config(var, value, cb);
+
+ return tar_filter_config(var, value, cb);
}
-int write_tar_archive(struct archiver_args *args)
+static int write_tar_archive(const struct archiver *ar,
+ struct archiver_args *args)
{
int err = 0;
- git_config(git_tar_config, NULL);
-
if (args->commit_sha1)
err = write_global_extended_header(args);
if (!err)
write_trailer();
return err;
}
+
+static int write_tar_filter_archive(const struct archiver *ar,
+ struct archiver_args *args)
+{
+ struct strbuf cmd = STRBUF_INIT;
+ struct child_process filter;
+ const char *argv[2];
+ int r;
+
+ if (!ar->data)
+ die("BUG: tar-filter archiver called with no filter defined");
+
+ strbuf_addstr(&cmd, ar->data);
+ if (args->compression_level >= 0)
+ strbuf_addf(&cmd, " -%d", args->compression_level);
+
+ memset(&filter, 0, sizeof(filter));
+ argv[0] = cmd.buf;
+ argv[1] = NULL;
+ filter.argv = argv;
+ filter.use_shell = 1;
+ filter.in = -1;
+
+ if (start_command(&filter) < 0)
+ die_errno("unable to start '%s' filter", argv[0]);
+ close(1);
+ if (dup2(filter.in, 1) < 0)
+ die_errno("unable to redirect descriptor");
+ close(filter.in);
+
+ r = write_tar_archive(ar, args);
+
+ close(1);
+ if (finish_command(&filter) != 0)
+ die("'%s' filter reported error", argv[0]);
+
+ strbuf_release(&cmd);
+ return r;
+}
+
+static struct archiver tar_archiver = {
+ "tar",
+ write_tar_archive,
+ ARCHIVER_REMOTE
+};
+
+void init_tar_archiver(void)
+{
+ int i;
+ register_archiver(&tar_archiver);
+
+ tar_filter_config("tar.tgz.command", "gzip -cn", NULL);
+ tar_filter_config("tar.tgz.remote", "true", NULL);
+ tar_filter_config("tar.tar.gz.command", "gzip -cn", NULL);
+ tar_filter_config("tar.tar.gz.remote", "true", NULL);
+ git_config(git_tar_config, NULL);
+ for (i = 0; i < nr_tar_filters; i++) {
+ /* omit any filters that never had a command configured */
+ if (tar_filters[i]->data)
+ register_archiver(tar_filters[i]);
+ }
+}