mirror of
https://git.zx2c4.com/cgit
synced 2024-11-22 08:28:42 +00:00
ed7ff095ca
When downloading a snapshot, the snapshot name will often contain the repo name combined with a tag. This patch tries to exploit this so that the correct revision is downloaded even if no specific revision is specified. PS: this only occurs if neither 'h' nor 'id' is specified in the query- string. PPS: this also fixes a bug which occurs when trying to download a filename with an unsupported suffix: it used to try to print an error message to the user but failed since it didn't prepare the output properly. Signed-off-by: Lars Hjemli <hjemli@gmail.com>
189 lines
5.4 KiB
C
189 lines
5.4 KiB
C
/* ui-snapshot.c: generate snapshot of a commit
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*
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* Copyright (C) 2006 Lars Hjemli
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*
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* Licensed under GNU General Public License v2
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* (see COPYING for full license text)
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*/
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#include "cgit.h"
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#include "html.h"
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#include "ui-shared.h"
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static int write_compressed_tar_archive(struct archiver_args *args,const char *filter)
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{
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int rw[2];
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pid_t gzpid;
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int stdout2;
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int status;
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int rv;
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stdout2 = chk_non_negative(dup(STDIN_FILENO), "Preserving STDOUT before compressing");
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chk_zero(pipe(rw), "Opening pipe from compressor subprocess");
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gzpid = chk_non_negative(fork(), "Forking compressor subprocess");
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if(gzpid==0) {
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/* child */
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chk_zero(close(rw[1]), "Closing write end of pipe in child");
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chk_zero(close(STDIN_FILENO), "Closing STDIN");
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chk_non_negative(dup2(rw[0],STDIN_FILENO), "Redirecting compressor input to stdin");
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execlp(filter,filter,NULL);
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_exit(-1);
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}
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/* parent */
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chk_zero(close(rw[0]), "Closing read end of pipe");
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chk_non_negative(dup2(rw[1],STDOUT_FILENO), "Redirecting output to compressor");
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rv = write_tar_archive(args);
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chk_zero(close(STDOUT_FILENO), "Closing STDOUT redirected to compressor");
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chk_non_negative(dup2(stdout2,STDOUT_FILENO), "Restoring uncompressed STDOUT");
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chk_zero(close(stdout2), "Closing uncompressed STDOUT");
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chk_zero(close(rw[1]), "Closing write end of pipe in parent");
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chk_positive(waitpid(gzpid,&status,0), "Waiting on compressor process");
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if(! ( WIFEXITED(status) && WEXITSTATUS(status)==0 ) )
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cgit_print_error("Failed to compress archive");
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return rv;
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}
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static int write_tar_gzip_archive(struct archiver_args *args)
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{
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return write_compressed_tar_archive(args,"gzip");
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}
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static int write_tar_bzip2_archive(struct archiver_args *args)
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{
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return write_compressed_tar_archive(args,"bzip2");
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}
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const struct cgit_snapshot_format cgit_snapshot_formats[] = {
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{ ".zip", "application/x-zip", write_zip_archive, 0x1 },
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{ ".tar.gz", "application/x-tar", write_tar_gzip_archive, 0x2 },
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{ ".tar.bz2", "application/x-tar", write_tar_bzip2_archive, 0x4 },
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{ ".tar", "application/x-tar", write_tar_archive, 0x8 },
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{}
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};
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static const struct cgit_snapshot_format *get_format(const char *filename)
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{
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const struct cgit_snapshot_format *fmt;
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int fl, sl;
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fl = strlen(filename);
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for(fmt = cgit_snapshot_formats; fmt->suffix; fmt++) {
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sl = strlen(fmt->suffix);
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if (sl >= fl)
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continue;
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if (!strcmp(fmt->suffix, filename + fl - sl))
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return fmt;
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}
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return NULL;
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}
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static int make_snapshot(const struct cgit_snapshot_format *format,
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const char *hex, const char *prefix,
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const char *filename)
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{
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struct archiver_args args;
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struct commit *commit;
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unsigned char sha1[20];
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if(get_sha1(hex, sha1)) {
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cgit_print_error(fmt("Bad object id: %s", hex));
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return 1;
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}
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commit = lookup_commit_reference(sha1);
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if(!commit) {
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cgit_print_error(fmt("Not a commit reference: %s", hex));
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return 1;
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}
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memset(&args, 0, sizeof(args));
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if (prefix) {
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args.base = fmt("%s/", prefix);
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args.baselen = strlen(prefix) + 1;
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} else {
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args.base = "";
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args.baselen = 0;
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}
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args.tree = commit->tree;
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args.time = commit->date;
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ctx.page.mimetype = xstrdup(format->mimetype);
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ctx.page.filename = xstrdup(filename);
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cgit_print_http_headers(&ctx);
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format->write_func(&args);
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return 0;
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}
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char *dwim_filename = NULL;
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const char *dwim_refname = NULL;
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static int ref_cb(const char *refname, const unsigned char *sha1, int flags,
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void *cb_data)
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{
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const char *r = refname;
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while (r && *r) {
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fprintf(stderr, " cmp %s with %s:", dwim_filename, r);
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if (!strcmp(dwim_filename, r)) {
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fprintf(stderr, "MATCH!\n");
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dwim_refname = refname;
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return 1;
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}
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fprintf(stderr, "no match\n");
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if (isdigit(*r))
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break;
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r++;
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}
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return 0;
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}
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/* Try to guess the requested revision by combining repo name and tag name
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* and comparing this to the requested snapshot name. E.g. the requested
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* snapshot is "cgit-0.7.2.tar.gz" while repo name is "cgit" and tag name
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* is "v0.7.2". First, the reponame is stripped off, leaving "-0.7.2.tar.gz".
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* Next, any '-' and '_' characters are stripped, leaving "0.7.2.tar.gz".
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* Finally, the requested format suffix is removed and we end up with "0.7.2".
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* Then we test each tag against this dwimmed filename, and for each tag
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* we even try to remove any leading characters which are non-digits. I.e.
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* we first compare with "v0.7.2", then with "0.7.2" and we've got a match.
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*/
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static const char *get_ref_from_filename(const char *url, const char *filename,
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const struct cgit_snapshot_format *fmt)
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{
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const char *reponame = cgit_repobasename(url);
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fprintf(stderr, "reponame=%s, filename=%s\n", reponame, filename);
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if (prefixcmp(filename, reponame))
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return NULL;
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filename += strlen(reponame);
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while (filename && (*filename == '-' || *filename == '_'))
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filename++;
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dwim_filename = xstrdup(filename);
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dwim_filename[strlen(filename) - strlen(fmt->suffix)] = '\0';
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for_each_tag_ref(ref_cb, NULL);
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return dwim_refname;
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}
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void cgit_print_snapshot(const char *head, const char *hex, const char *prefix,
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const char *filename, int snapshots, int dwim)
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{
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const struct cgit_snapshot_format* f;
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f = get_format(filename);
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if (!f) {
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ctx.page.mimetype = "text/html";
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cgit_print_http_headers(&ctx);
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cgit_print_docstart(&ctx);
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cgit_print_pageheader(&ctx);
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cgit_print_error(fmt("Unsupported snapshot format: %s", filename));
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cgit_print_docend();
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return;
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}
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if (!hex && dwim)
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hex = get_ref_from_filename(ctx.repo->url, filename, f);
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if (!hex)
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hex = head;
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make_snapshot(f, hex, prefix, filename);
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}
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