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
@@ -12,25 +12,28 @@ 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
@@ -73,25 +73,31 @@ static int make_snapshot(const struct cgit_snapshot_format *format,
 	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)
 {