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authorLukas Fleischer <lfleischer@lfos.de>2016-05-24 18:15:18 +0200
committerJason A. Donenfeld <Jason@zx2c4.com>2016-07-05 16:14:40 +0200
commit9984e7ab49c59e49a0d7e62c3435e7133f7a53ec (patch)
tree1f3a53622746e5fe43e9d5c7c9bc27ab2da22761
parent1e039ada8554c7e2fc65524827c61613a24256fb (diff)
downloadcgit-9984e7ab49c59e49a0d7e62c3435e7133f7a53ec.tar.gz
Avoid ambiguities when prettifying snapshot names
When composing snapshot file names for a tag with a prefix of the form v[0-9] (resp. V[0-9]), the leading "v" (resp. "V") is stripped. This leads to conflicts if a tag with the stripped name already exists or if there are tags only differing in the capitalization of the leading "v". Make sure we do not strip the "v" in these cases. Reported-by: Juuso Lapinlampi <wub@partyvan.eu> Signed-off-by: Lukas Fleischer <lfleischer@lfos.de>
-rw-r--r--ui-refs.c24
-rw-r--r--ui-shared.c26
-rw-r--r--ui-shared.h2
3 files changed, 32 insertions, 20 deletions
diff --git a/ui-refs.c b/ui-refs.c
index 5b4530e..75f2789 100644
--- a/ui-refs.c
+++ b/ui-refs.c
@@ -93,34 +93,28 @@ static void print_tag_header(void)
static void print_tag_downloads(const struct cgit_repo *repo, const char *ref)
{
const struct cgit_snapshot_format* f;
- struct strbuf filename = STRBUF_INIT;
const char *basename;
- int free_ref = 0;
+ struct strbuf filename = STRBUF_INIT;
+ size_t prefixlen;
if (!ref || strlen(ref) < 1)
return;
basename = cgit_repobasename(repo->url);
- if (!starts_with(ref, basename)) {
- if ((ref[0] == 'v' || ref[0] == 'V') && isdigit(ref[1]))
- ref++;
- if (isdigit(ref[0])) {
- ref = fmtalloc("%s-%s", basename, ref);
- free_ref = 1;
- }
- }
-
+ if (starts_with(ref, basename))
+ strbuf_addstr(&filename, ref);
+ else
+ cgit_compose_snapshot_prefix(&filename, basename, ref);
+ prefixlen = filename.len;
for (f = cgit_snapshot_formats; f->suffix; f++) {
if (!(repo->snapshots & f->bit))
continue;
- strbuf_reset(&filename);
- strbuf_addf(&filename, "%s%s", ref, f->suffix);
+ strbuf_setlen(&filename, prefixlen);
+ strbuf_addstr(&filename, f->suffix);
cgit_snapshot_link(filename.buf, NULL, NULL, NULL, NULL, filename.buf);
html("&nbsp;&nbsp;");
}
- if (free_ref)
- free((char *)ref);
strbuf_release(&filename);
}
diff --git a/ui-shared.c b/ui-shared.c
index 562fa0e..b1a6c46 100644
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -1069,18 +1069,34 @@ void cgit_print_filemode(unsigned short mode)
html_fileperm(mode);
}
+void cgit_compose_snapshot_prefix(struct strbuf *filename, const char *base,
+ const char *ref)
+{
+ unsigned char sha1[20];
+
+ /*
+ * Prettify snapshot names by stripping leading "v" or "V" if the tag
+ * name starts with {v,V}[0-9] and the prettify mapping is injective,
+ * i.e. each stripped tag can be inverted without ambiguities.
+ */
+ if (get_sha1(fmt("refs/tags/%s", ref), sha1) == 0 &&
+ (ref[0] == 'v' || ref[0] == 'V') && isdigit(ref[1]) &&
+ ((get_sha1(fmt("refs/tags/%s", ref + 1), sha1) == 0) +
+ (get_sha1(fmt("refs/tags/v%s", ref + 1), sha1) == 0) +
+ (get_sha1(fmt("refs/tags/V%s", ref + 1), sha1) == 0) == 1))
+ ref++;
+
+ strbuf_addf(filename, "%s-%s", base, ref);
+}
+
void cgit_print_snapshot_links(const char *repo, const char *head,
const char *hex, int snapshots)
{
const struct cgit_snapshot_format* f;
struct strbuf filename = STRBUF_INIT;
size_t prefixlen;
- unsigned char sha1[20];
- if (get_sha1(fmt("refs/tags/%s", hex), sha1) == 0 &&
- (hex[0] == 'v' || hex[0] == 'V') && isdigit(hex[1]))
- hex++;
- strbuf_addf(&filename, "%s-%s", cgit_repobasename(repo), hex);
+ cgit_compose_snapshot_prefix(&filename, cgit_repobasename(repo), hex);
prefixlen = filename.len;
for (f = cgit_snapshot_formats; f->suffix; f++) {
if (!(snapshots & f->bit))
diff --git a/ui-shared.h b/ui-shared.h
index b457c97..87799f1 100644
--- a/ui-shared.h
+++ b/ui-shared.h
@@ -71,6 +71,8 @@ __attribute__((format (printf,3,4)))
extern void cgit_print_error_page(int code, const char *msg, const char *fmt, ...);
extern void cgit_print_pageheader(void);
extern void cgit_print_filemode(unsigned short mode);
+extern void cgit_compose_snapshot_prefix(struct strbuf *filename,
+ const char *base, const char *ref);
extern void cgit_print_snapshot_links(const char *repo, const char *head,
const char *hex, int snapshots);
extern void cgit_add_hidden_formfields(int incl_head, int incl_search,