| /* ui-snapshot.c: generate snapshot of a commit |
| * |
| * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com> |
| * |
| * Licensed under GNU General Public License v2 |
| * (see COPYING for full license text) |
| */ |
| |
| #include "cgit.h" |
| #include "ui-snapshot.h" |
| #include "html.h" |
| #include "ui-shared.h" |
| |
| static int write_archive_type(const char *format, const char *hex, const char *prefix) |
| { |
| struct argv_array argv = ARGV_ARRAY_INIT; |
| const char **nargv; |
| int result; |
| argv_array_push(&argv, "snapshot"); |
| argv_array_push(&argv, format); |
| if (prefix) { |
| struct strbuf buf = STRBUF_INIT; |
| strbuf_addstr(&buf, prefix); |
| strbuf_addch(&buf, '/'); |
| argv_array_push(&argv, "--prefix"); |
| argv_array_push(&argv, buf.buf); |
| strbuf_release(&buf); |
| } |
| argv_array_push(&argv, hex); |
| /* |
| * Now we need to copy the pointers to arguments into a new |
| * structure because write_archive will rearrange its arguments |
| * which may result in duplicated/missing entries causing leaks |
| * or double-frees in argv_array_clear. |
| */ |
| nargv = xmalloc(sizeof(char *) * (argv.argc + 1)); |
| /* argv_array guarantees a trailing NULL entry. */ |
| memcpy(nargv, argv.argv, sizeof(char *) * (argv.argc + 1)); |
| |
| result = write_archive(argv.argc, nargv, NULL, NULL, 0); |
| argv_array_clear(&argv); |
| free(nargv); |
| return result; |
| } |
| |
| static int write_tar_archive(const char *hex, const char *prefix) |
| { |
| return write_archive_type("--format=tar", hex, prefix); |
| } |
| |
| static int write_zip_archive(const char *hex, const char *prefix) |
| { |
| return write_archive_type("--format=zip", hex, prefix); |
| } |
| |
| static int write_compressed_tar_archive(const char *hex, |
| const char *prefix, |
| char *filter_argv[]) |
| { |
| int rv; |
| struct cgit_exec_filter f; |
| cgit_exec_filter_init(&f, filter_argv[0], filter_argv); |
| |
| cgit_open_filter(&f.base); |
| rv = write_tar_archive(hex, prefix); |
| cgit_close_filter(&f.base); |
| return rv; |
| } |
| |
| static int write_tar_gzip_archive(const char *hex, const char *prefix) |
| { |
| char *argv[] = { "gzip", "-n", NULL }; |
| return write_compressed_tar_archive(hex, prefix, argv); |
| } |
| |
| static int write_tar_bzip2_archive(const char *hex, const char *prefix) |
| { |
| char *argv[] = { "bzip2", NULL }; |
| return write_compressed_tar_archive(hex, prefix, argv); |
| } |
| |
| static int write_tar_xz_archive(const char *hex, const char *prefix) |
| { |
| char *argv[] = { "xz", NULL }; |
| return write_compressed_tar_archive(hex, prefix, argv); |
| } |
| |
| const struct cgit_snapshot_format cgit_snapshot_formats[] = { |
| { ".zip", "application/x-zip", write_zip_archive, 0x01 }, |
| { ".tar.gz", "application/x-gzip", write_tar_gzip_archive, 0x02 }, |
| { ".tar.bz2", "application/x-bzip2", write_tar_bzip2_archive, 0x04 }, |
| { ".tar", "application/x-tar", write_tar_archive, 0x08 }, |
| { ".tar.xz", "application/x-xz", write_tar_xz_archive, 0x10 }, |
| { NULL } |
| }; |
| |
| static const struct cgit_snapshot_format *get_format(const char *filename) |
| { |
| const struct cgit_snapshot_format *fmt; |
| |
| for (fmt = cgit_snapshot_formats; fmt->suffix; fmt++) { |
| if (ends_with(filename, fmt->suffix)) |
| return fmt; |
| } |
| return NULL; |
| } |
| |
| static int make_snapshot(const struct cgit_snapshot_format *format, |
| const char *hex, const char *prefix, |
| const char *filename) |
| { |
| struct object_id oid; |
| |
| if (get_oid(hex, &oid)) { |
| cgit_print_error_page(404, "Not found", |
| "Bad object id: %s", hex); |
| return 1; |
| } |
| if (!lookup_commit_reference(&oid)) { |
| cgit_print_error_page(400, "Bad request", |
| "Not a commit reference: %s", hex); |
| return 1; |
| } |
| ctx.page.etag = oid_to_hex(&oid); |
| ctx.page.mimetype = xstrdup(format->mimetype); |
| ctx.page.filename = xstrdup(filename); |
| cgit_print_http_headers(); |
| format->write_func(hex, prefix); |
| return 0; |
| } |
| |
| /* Try to guess the requested revision from the requested snapshot name. |
| * First the format extension is stripped, e.g. "cgit-0.7.2.tar.gz" become |
| * "cgit-0.7.2". If this is a valid commit object name we've got a winner. |
| * Otherwise, if the snapshot name has a prefix matching the result from |
| * repo_basename(), we strip the basename and any following '-' and '_' |
| * characters ("cgit-0.7.2" -> "0.7.2") and check the resulting name once |
| * more. If this still isn't a valid commit object name, we check if pre- |
| * pending a 'v' or a 'V' to the remaining snapshot name ("0.7.2" -> |
| * "v0.7.2") gives us something valid. |
| */ |
| static const char *get_ref_from_filename(const char *url, const char *filename, |
| const struct cgit_snapshot_format *format) |
| { |
| const char *reponame; |
| struct object_id oid; |
| struct strbuf snapshot = STRBUF_INIT; |
| int result = 1; |
| |
| strbuf_addstr(&snapshot, filename); |
| strbuf_setlen(&snapshot, snapshot.len - strlen(format->suffix)); |
| |
| if (get_oid(snapshot.buf, &oid) == 0) |
| goto out; |
| |
| reponame = cgit_repobasename(url); |
| if (starts_with(snapshot.buf, reponame)) { |
| const char *new_start = snapshot.buf; |
| new_start += strlen(reponame); |
| while (new_start && (*new_start == '-' || *new_start == '_')) |
| new_start++; |
| strbuf_splice(&snapshot, 0, new_start - snapshot.buf, "", 0); |
| } |
| |
| if (get_oid(snapshot.buf, &oid) == 0) |
| goto out; |
| |
| strbuf_insert(&snapshot, 0, "v", 1); |
| if (get_oid(snapshot.buf, &oid) == 0) |
| goto out; |
| |
| strbuf_splice(&snapshot, 0, 1, "V", 1); |
| if (get_oid(snapshot.buf, &oid) == 0) |
| goto out; |
| |
| result = 0; |
| strbuf_release(&snapshot); |
| |
| out: |
| return result ? strbuf_detach(&snapshot, NULL) : NULL; |
| } |
| |
| void cgit_print_snapshot(const char *head, const char *hex, |
| const char *filename, int dwim) |
| { |
| const struct cgit_snapshot_format* f; |
| char *prefix = NULL; |
| |
| if (!filename) { |
| cgit_print_error_page(400, "Bad request", |
| "No snapshot name specified"); |
| return; |
| } |
| |
| f = get_format(filename); |
| if (!f) { |
| cgit_print_error_page(400, "Bad request", |
| "Unsupported snapshot format: %s", filename); |
| return; |
| } |
| |
| if (!hex && dwim) { |
| hex = get_ref_from_filename(ctx.repo->url, filename, f); |
| if (hex == NULL) { |
| cgit_print_error_page(404, "Not found", "Not found"); |
| return; |
| } |
| prefix = xstrdup(filename); |
| prefix[strlen(filename) - strlen(f->suffix)] = '\0'; |
| } |
| |
| if (!hex) |
| hex = head; |
| |
| if (!prefix) |
| prefix = xstrdup(cgit_repobasename(ctx.repo->url)); |
| |
| make_snapshot(f, hex, prefix, filename); |
| free(prefix); |
| } |