ui-snapshot.c: specify archiver_args.baselen

The struct member was introduces in git commit d53fe8187c38, but the cgit
testsuite failed to detect that cgit always generated archives without
prefixes, i.e. the result from cgit_repobasename was ignored.

This fixes the bug and the testsuite.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

2 files changed, 11 insertions, 2 deletions

diff --git a/tests/t0107-snapshot.sh b/tests/t0107-snapshot.sh
index 8e90e10..d97c465 100755
--- a/tests/t0107-snapshot.sh
+++ b/tests/t0107-snapshot.sh
@@ -8,29 +8,32 @@ run_test 'get foo/snapshot/test.tar.gz' '
         cgit_url "foo/snapshot/test.tar.gz" >trash/tmp
 '
 
 run_test 'check html headers' '
         head -n 1 trash/tmp |
              grep -e "Content-Type: application/x-tar" &&
 
         head -n 2 trash/tmp |
              grep -e "Content-Disposition: inline; filename=.test.tar.gz."
 '
 
 run_test 'strip off the header lines' '
          tail -n +6 trash/tmp > trash/test.tar.gz
 '
 
 run_test 'verify gzip format' 'gunzip --test trash/test.tar.gz'
-run_test 'untar' 'tar -xf trash/test.tar.gz -C trash'
+run_test 'untar' '
+        rm -rf trash/foo &&
+        tar -xf trash/test.tar.gz -C trash
+'
 
 run_test 'count files' '
         c=$(ls -1 trash/foo/ | wc -l) &&
         test $c = 5
 '
 
 run_test 'verify untarred file-5' '
          grep -e "^5$" trash/foo/file-5 &&
          test $(cat trash/foo/file-5 | wc -l) = 1
 '
 
 tests_done
diff --git a/ui-snapshot.c b/ui-snapshot.c
index 966a140..7a597ff 100644
--- a/ui-snapshot.c
+++ b/ui-snapshot.c
@@ -69,33 +69,39 @@ static int make_snapshot(const struct cgit_snapshot_format *format,
                          const char *filename)
 {
         struct archiver_args args;
         struct commit *commit;
         unsigned char sha1[20];
 
         if(get_sha1(hex, sha1)) {
                 cgit_print_error(fmt("Bad object id: %s", hex));
                 return 1;
         }
         commit = lookup_commit_reference(sha1);
         if(!commit) {
                 cgit_print_error(fmt("Not a commit reference: %s", hex));
                 return 1;
         }
         memset(&args, 0, sizeof(args));
-        args.base = fmt("%s/", prefix);
+        if (prefix) {
+                args.base = fmt("%s/", prefix);
+                args.baselen = strlen(prefix) + 1;
+        } else {
+                args.base = "";
+                args.baselen = 0;
+        }
         args.tree = commit->tree;
         args.time = commit->date;
         ctx.page.mimetype = xstrdup(format->mimetype);
         ctx.page.filename = xstrdup(filename);
         cgit_print_http_headers(&ctx);
         format->write_func(&args);
         return 0;
 }
 
 void cgit_print_snapshot(const char *head, const char *hex, const char *prefix,
                          const char *filename, int snapshots)
 {
         const struct cgit_snapshot_format* f;
         int sl, fnl;
 
         fnl = strlen(filename);