From: Junio C Hamano Date: Fri, 19 May 2006 01:46:44 +0000 (-0700) Subject: built-in tar-tree and remote tar-tree X-Git-Tag: v1.4.0-rc1~77^2^2 X-Git-Url: https://git.verplant.org/?a=commitdiff_plain;h=217542640ed219c980fff2b3c307c4520120f20f;p=git.git built-in tar-tree and remote tar-tree This makes tar-tree a built-in. As an added bonus, you can now say: git tar-tree --remote=remote-repository [] This does not work with git-daemon yet, but should work with localhost and git over ssh transports. Signed-off-by: Junio C Hamano --- diff --git a/Makefile b/Makefile index 4fd6520b..f4bcec49 100644 --- a/Makefile +++ b/Makefile @@ -161,7 +161,7 @@ PROGRAMS = \ git-receive-pack$X git-rev-parse$X \ git-send-pack$X git-show-branch$X git-shell$X \ git-show-index$X git-ssh-fetch$X \ - git-ssh-upload$X git-tar-tree$X git-unpack-file$X \ + git-ssh-upload$X git-unpack-file$X \ git-unpack-objects$X git-update-index$X git-update-server-info$X \ git-upload-pack$X git-verify-pack$X git-write-tree$X \ git-update-ref$X git-symbolic-ref$X \ @@ -171,7 +171,7 @@ PROGRAMS = \ BUILT_INS = git-log$X git-whatchanged$X git-show$X \ git-count-objects$X git-diff$X git-push$X \ git-grep$X git-rev-list$X git-check-ref-format$X \ - git-init-db$X + git-init-db$X git-tar-tree$X git-upload-tar$X # what 'all' will build and 'install' will install, in gitexecdir ALL_PROGRAMS = $(PROGRAMS) $(SIMPLE_PROGRAMS) $(SCRIPTS) @@ -220,7 +220,7 @@ LIB_OBJS = \ BUILTIN_OBJS = \ builtin-log.o builtin-help.o builtin-count.o builtin-diff.o builtin-push.o \ builtin-grep.o builtin-rev-list.o builtin-check-ref-format.o \ - builtin-init-db.o + builtin-init-db.o builtin-tar-tree.o builtin-upload-tar.o GITLIBS = $(LIB_FILE) $(XDIFF_LIB) LIBS = $(GITLIBS) -lz diff --git a/builtin-tar-tree.c b/builtin-tar-tree.c new file mode 100644 index 00000000..e97e0af9 --- /dev/null +++ b/builtin-tar-tree.c @@ -0,0 +1,408 @@ +/* + * Copyright (c) 2005, 2006 Rene Scharfe + */ +#include +#include "cache.h" +#include "tree-walk.h" +#include "commit.h" +#include "strbuf.h" +#include "tar.h" +#include "builtin.h" +#include "pkt-line.h" + +#define RECORDSIZE (512) +#define BLOCKSIZE (RECORDSIZE * 20) + +static const char tar_tree_usage[] = +"git-tar-tree [--remote=] [basedir]"; + +static char block[BLOCKSIZE]; +static unsigned long offset; + +static time_t archive_time; + +/* 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 = xwrite(1, buf, size); + if (ret < 0) { + if (errno == EPIPE) + exit(0); + die("git-tar-tree: %s", strerror(errno)); + } else if (!ret) { + die("git-tar-tree: disk full?"); + } + size -= ret; + buf += ret; + } +} + +/* writes out the whole block, but only if it is full */ +static void write_if_needed(void) +{ + if (offset == BLOCKSIZE) { + reliable_write(block, BLOCKSIZE); + offset = 0; + } +} + +/* 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) +{ + get_record(); + write_if_needed(); + get_record(); + write_if_needed(); + while (offset) { + get_record(); + write_if_needed(); + } +} + +/* + * queues up writes, so that all our write(2) calls write exactly one + * full block; pads writes to RECORDSIZE + */ +static void write_blocked(void *buf, unsigned long size) +{ + unsigned long tail; + + if (offset) { + unsigned long chunk = BLOCKSIZE - offset; + if (size < chunk) + chunk = size; + memcpy(block + offset, buf, chunk); + size -= chunk; + offset += chunk; + buf += chunk; + write_if_needed(); + } + while (size >= BLOCKSIZE) { + reliable_write(buf, BLOCKSIZE); + size -= BLOCKSIZE; + buf += BLOCKSIZE; + } + if (size) { + memcpy(block + offset, buf, size); + offset += size; + } + tail = offset % RECORDSIZE; + if (tail) { + memset(block + offset, 0, RECORDSIZE - tail); + offset += RECORDSIZE - tail; + } + write_if_needed(); +} + +static void strbuf_append_string(struct strbuf *sb, const char *s) +{ + 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; +} + +/* + * 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) +{ + char *p; + int len, total, tmp; + + /* "%u %s=%s\n" */ + len = 1 + 1 + strlen(keyword) + 1 + valuelen + 1; + for (tmp = len; tmp > 9; tmp /= 10) + len++; + + total = sb->len + len; + if (total > sb->alloc) { + sb->buf = xrealloc(sb->buf, total); + sb->alloc = total; + } + + p = sb->buf; + p += sprintf(p, "%u %s=", len, keyword); + memcpy(p, value, valuelen); + p += valuelen; + *p = '\n'; + sb->len = total; +} + +static unsigned int ustar_header_chksum(const struct ustar_header *header) +{ + 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 int get_path_prefix(const struct strbuf *path, int maxlen) +{ + int i = path->len; + if (i > maxlen) + i = maxlen; + while (i > 0 && path->buf[i] != '/') + i--; + return i; +} + +static void write_entry(const unsigned char *sha1, struct strbuf *path, + unsigned int mode, void *buffer, unsigned long size) +{ + 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 { + 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_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.mode, "%07o", mode & 07777); + sprintf(header.size, "%011lo", S_ISREG(mode) ? size : 0); + sprintf(header.mtime, "%011lo", archive_time); + + /* 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.magic, "ustar", 6); + memcpy(header.version, "00", 2); + + sprintf(header.chksum, "%07o", ustar_header_chksum(&header)); + + 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); +} + +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(struct tree_desc *tree, struct strbuf *path) +{ + int pathlen = path->len; + + while (tree->size) { + const char *name; + const unsigned char *sha1; + unsigned mode; + void *eltbuf; + char elttype[20]; + unsigned long eltsize; + + 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)); + + path->len = pathlen; + strbuf_append_string(path, name); + if (S_ISDIR(mode)) + strbuf_append_string(path, "/"); + + 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); + } + free(eltbuf); + } +} + +int generate_tar(int argc, const char **argv) +{ + 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: + strbuf_append_string(¤t_path, argv[2]); + strbuf_append_string(¤t_path, "/"); + /* FALLTHROUGH */ + case 2: + if (get_sha1(argv[1], sha1)) + die("Not a valid object name %s", argv[1]); + break; + default: + usage(tar_tree_usage); + } + + 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); + + tree.buf = read_object_with_reference(sha1, tree_type, &tree.size, + tree_sha1); + if (!tree.buf) + die("not a reference to a tag, commit or tree object: %s", + sha1_to_hex(sha1)); + + 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; +} + +static const char *exec = "git-upload-tar"; + +static int remote_tar(int argc, const char **argv) +{ + int fd[2], ret, len; + pid_t pid; + char buf[1024]; + char *url; + + if (argc < 3 || 4 < argc) + usage(tar_tree_usage); + + /* --remote= */ + url = strdup(argv[1]+9); + pid = git_connect(fd, url, exec); + if (pid < 0) + return 1; + + packet_write(fd[1], "want %s\n", argv[2]); + if (argv[3]) + packet_write(fd[1], "base %s\n", argv[3]); + packet_flush(fd[1]); + + len = packet_read_line(fd[0], buf, sizeof(buf)); + if (!len) + die("git-tar-tree: expected ACK/NAK, got EOF"); + if (buf[len-1] == '\n') + buf[--len] = 0; + if (strcmp(buf, "ACK")) { + if (5 < len && !strncmp(buf, "NACK ", 5)) + die("git-tar-tree: NACK %s", buf + 5); + die("git-tar-tree: protocol error"); + } + /* expect a flush */ + len = packet_read_line(fd[0], buf, sizeof(buf)); + if (len) + die("git-tar-tree: expected a flush"); + + /* Now, start reading from fd[0] and spit it out to stdout */ + ret = copy_fd(fd[0], 1); + close(fd[0]); + + ret |= finish_connect(pid); + return !!ret; +} + +int cmd_tar_tree(int argc, const char **argv, char **envp) +{ + if (argc < 2) + usage(tar_tree_usage); + if (!strncmp("--remote=", argv[1], 9)) + return remote_tar(argc, argv); + return generate_tar(argc, argv); +} diff --git a/builtin-upload-tar.c b/builtin-upload-tar.c new file mode 100644 index 00000000..d4fa7b56 --- /dev/null +++ b/builtin-upload-tar.c @@ -0,0 +1,74 @@ +/* + * Copyright (c) 2006 Junio C Hamano + */ +#include "cache.h" +#include "pkt-line.h" +#include "exec_cmd.h" +#include "builtin.h" + +static const char upload_tar_usage[] = "git-upload-tar "; + +static int nak(const char *reason) +{ + packet_write(1, "NACK %s\n", reason); + packet_flush(1); + return 1; +} + +int cmd_upload_tar(int argc, const char **argv, char **envp) +{ + int len; + const char *dir = argv[1]; + char buf[8192]; + unsigned char sha1[20]; + char *base = NULL; + char hex[41]; + int ac; + const char *av[4]; + + if (argc != 2) + usage(upload_tar_usage); + if (strlen(dir) < sizeof(buf)-1) + strcpy(buf, dir); /* enter-repo smudges its argument */ + else + packet_write(1, "NACK insanely long repository name %s\n", dir); + if (!enter_repo(buf, 0)) { + packet_write(1, "NACK not a git archive %s\n", dir); + packet_flush(1); + return 1; + } + + len = packet_read_line(0, buf, sizeof(buf)); + if (len < 5 || strncmp("want ", buf, 5)) + return nak("expected want"); + if (buf[len-1] == '\n') + buf[--len] = 0; + if (get_sha1(buf + 5, sha1)) + return nak("expected sha1"); + strcpy(hex, sha1_to_hex(sha1)); + + len = packet_read_line(0, buf, sizeof(buf)); + if (len) { + if (len < 5 || strncmp("base ", buf, 5)) + return nak("expected (optional) base"); + if (buf[len-1] == '\n') + buf[--len] = 0; + base = strdup(buf + 5); + len = packet_read_line(0, buf, sizeof(buf)); + } + if (len) + return nak("expected flush"); + + packet_write(1, "ACK\n"); + packet_flush(1); + + ac = 0; + av[ac++] = "tar-tree"; + av[ac++] = hex; + if (base) + av[ac++] = base; + av[ac++] = NULL; + execv_git_cmd(av); + /* should it return that is an error */ + return 1; +} diff --git a/builtin.h b/builtin.h index 60541262..f22783c4 100644 --- a/builtin.h +++ b/builtin.h @@ -27,5 +27,7 @@ extern int cmd_grep(int argc, const char **argv, char **envp); extern int cmd_rev_list(int argc, const char **argv, char **envp); extern int cmd_check_ref_format(int argc, const char **argv, char **envp); extern int cmd_init_db(int argc, const char **argv, char **envp); +extern int cmd_tar_tree(int argc, const char **argv, char **envp); +extern int cmd_upload_tar(int argc, const char **argv, char **envp); #endif diff --git a/git.c b/git.c index 3216d311..fd8e9bf7 100644 --- a/git.c +++ b/git.c @@ -50,8 +50,10 @@ static void handle_internal_command(int argc, const char **argv, char **envp) { "count-objects", cmd_count_objects }, { "diff", cmd_diff }, { "grep", cmd_grep }, - { "rev-list", cmd_rev_list }, { "init-db", cmd_init_db }, + { "tar-tree", cmd_tar_tree }, + { "upload-tar", cmd_upload_tar }, + { "rev-list", cmd_rev_list }, { "check-ref-format", cmd_check_ref_format } }; int i; diff --git a/tar-tree.c b/tar-tree.c deleted file mode 100644 index 33087366..00000000 --- a/tar-tree.c +++ /dev/null @@ -1,350 +0,0 @@ -/* - * Copyright (c) 2005, 2006 Rene Scharfe - */ -#include -#include "cache.h" -#include "tree-walk.h" -#include "commit.h" -#include "strbuf.h" -#include "tar.h" - -#define RECORDSIZE (512) -#define BLOCKSIZE (RECORDSIZE * 20) - -static const char tar_tree_usage[] = "git-tar-tree [basedir]"; - -static char block[BLOCKSIZE]; -static unsigned long offset; - -static time_t archive_time; - -/* 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 = xwrite(1, buf, size); - if (ret < 0) { - if (errno == EPIPE) - exit(0); - die("git-tar-tree: %s", strerror(errno)); - } else if (!ret) { - die("git-tar-tree: disk full?"); - } - size -= ret; - buf += ret; - } -} - -/* writes out the whole block, but only if it is full */ -static void write_if_needed(void) -{ - if (offset == BLOCKSIZE) { - reliable_write(block, BLOCKSIZE); - offset = 0; - } -} - -/* 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) -{ - get_record(); - write_if_needed(); - get_record(); - write_if_needed(); - while (offset) { - get_record(); - write_if_needed(); - } -} - -/* - * queues up writes, so that all our write(2) calls write exactly one - * full block; pads writes to RECORDSIZE - */ -static void write_blocked(void *buf, unsigned long size) -{ - unsigned long tail; - - if (offset) { - unsigned long chunk = BLOCKSIZE - offset; - if (size < chunk) - chunk = size; - memcpy(block + offset, buf, chunk); - size -= chunk; - offset += chunk; - buf += chunk; - write_if_needed(); - } - while (size >= BLOCKSIZE) { - reliable_write(buf, BLOCKSIZE); - size -= BLOCKSIZE; - buf += BLOCKSIZE; - } - if (size) { - memcpy(block + offset, buf, size); - offset += size; - } - tail = offset % RECORDSIZE; - if (tail) { - memset(block + offset, 0, RECORDSIZE - tail); - offset += RECORDSIZE - tail; - } - write_if_needed(); -} - -static void strbuf_append_string(struct strbuf *sb, const char *s) -{ - 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; -} - -/* - * 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) -{ - char *p; - int len, total, tmp; - - /* "%u %s=%s\n" */ - len = 1 + 1 + strlen(keyword) + 1 + valuelen + 1; - for (tmp = len; tmp > 9; tmp /= 10) - len++; - - total = sb->len + len; - if (total > sb->alloc) { - sb->buf = xrealloc(sb->buf, total); - sb->alloc = total; - } - - p = sb->buf; - p += sprintf(p, "%u %s=", len, keyword); - memcpy(p, value, valuelen); - p += valuelen; - *p = '\n'; - sb->len = total; -} - -static unsigned int ustar_header_chksum(const struct ustar_header *header) -{ - 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 int get_path_prefix(const struct strbuf *path, int maxlen) -{ - int i = path->len; - if (i > maxlen) - i = maxlen; - while (i > 0 && path->buf[i] != '/') - i--; - return i; -} - -static void write_entry(const unsigned char *sha1, struct strbuf *path, - unsigned int mode, void *buffer, unsigned long size) -{ - 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 { - 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_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.mode, "%07o", mode & 07777); - sprintf(header.size, "%011lo", S_ISREG(mode) ? size : 0); - sprintf(header.mtime, "%011lo", archive_time); - - /* 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.magic, "ustar", 6); - memcpy(header.version, "00", 2); - - sprintf(header.chksum, "%07o", ustar_header_chksum(&header)); - - 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); -} - -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(struct tree_desc *tree, struct strbuf *path) -{ - int pathlen = path->len; - - while (tree->size) { - const char *name; - const unsigned char *sha1; - unsigned mode; - void *eltbuf; - char elttype[20]; - unsigned long eltsize; - - 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)); - - path->len = pathlen; - strbuf_append_string(path, name); - if (S_ISDIR(mode)) - strbuf_append_string(path, "/"); - - 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); - } - free(eltbuf); - } -} - -int main(int argc, char **argv) -{ - 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: - strbuf_append_string(¤t_path, argv[2]); - strbuf_append_string(¤t_path, "/"); - /* FALLTHROUGH */ - case 2: - if (get_sha1(argv[1], sha1)) - die("Not a valid object name %s", argv[1]); - break; - default: - usage(tar_tree_usage); - } - - 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); - - tree.buf = read_object_with_reference(sha1, tree_type, &tree.size, - tree_sha1); - if (!tree.buf) - die("not a reference to a tag, commit or tree object: %s", - sha1_to_hex(sha1)); - - 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; -}