Add "snapshot-prefix" repo configuration

Allow using a user-specified value for the prefix in snapshot files
instead of the repository basename.  For example, files downloaded from
the linux-stable.git repository should be named linux-$VERSION and not
linux-stable-$VERSION, which can be achieved by setting:

	repo.snapshot-prefix=linux

Signed-off-by: John Keeping <john@keeping.me.uk>
Reviewed-by: Christian Hesse <mail@eworm.de>

7 files changed, 23 insertions, 4 deletions

diff --git a/cgit.c b/cgit.c
index bd9cb3f..d2f7b9c 100644
--- a/cgit.c
+++ b/cgit.c
@@ -79,6 +79,8 @@ static void repo_config(struct cgit_repo *repo, const char *name, const char *va
                 item->util = xstrdup(value);
         } else if (!strcmp(name, "section"))
                 repo->section = xstrdup(value);
+        else if (!strcmp(name, "snapshot-prefix"))
+                repo->snapshot_prefix = xstrdup(value);
         else if (!strcmp(name, "readme") && value != NULL) {
                 if (repo->readme.items == ctx.cfg.readme.items)
                         memset(&repo->readme, 0, sizeof(repo->readme));
diff --git a/cgit.h b/cgit.h
index 005ae63..847cd2e 100644
--- a/cgit.h
+++ b/cgit.h
@@ -88,6 +88,7 @@ struct cgit_repo {
         char *clone_url;
         char *logo;
         char *logo_link;
+        char *snapshot_prefix;
         int snapshots;
         int enable_commit_graph;
         int enable_log_filecount;
diff --git a/cgitrc.5.txt b/cgitrc.5.txt
index 4da166c..a9d3d0a 100644
--- a/cgitrc.5.txt
+++ b/cgitrc.5.txt
@@ -599,6 +599,13 @@ repo.snapshots::
         restricted by the global "snapshots" setting. Default value:
         <snapshots>.
 
+repo.snapshot-prefix::
+        Prefix to use for snapshot links instead of the repository basename.
+        For example, the "linux-stable" repository may wish to set this to
+        "linux" so that snapshots are in the format "linux-3.15.4" instead
+        of "linux-stable-3.15.4".  Default value: <empty> meaning to use
+        the repository basename.
+
 repo.section::
         Override the current section name for this repository. Default value:
         none.
diff --git a/ui-refs.c b/ui-refs.c
index 75f2789..50d9d30 100644
--- a/ui-refs.c
+++ b/ui-refs.c
@@ -100,7 +100,7 @@ static void print_tag_downloads(const struct cgit_repo *repo, const char *ref)
         if (!ref || strlen(ref) < 1)
                 return;
 
-        basename = cgit_repobasename(repo->url);
+        basename = cgit_snapshot_prefix(repo);
         if (starts_with(ref, basename))
                 strbuf_addstr(&filename, ref);
         else
diff --git a/ui-shared.c b/ui-shared.c
index e719c1b..d857873 100644
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -152,6 +152,14 @@ const char *cgit_repobasename(const char *reponame)
         return rvbuf;
 }
 
+const char *cgit_snapshot_prefix(const struct cgit_repo *repo)
+{
+        if (repo->snapshot_prefix)
+                return repo->snapshot_prefix;
+
+        return cgit_repobasename(repo->url);
+}
+
 static void site_url(const char *page, const char *search, const char *sort, int ofs, int always_root)
 {
         char *delim = "?";
@@ -1110,7 +1118,7 @@ void cgit_print_snapshot_links(const struct cgit_repo *repo, const char *head,
         struct strbuf filename = STRBUF_INIT;
         size_t prefixlen;
 
-        cgit_compose_snapshot_prefix(&filename, cgit_repobasename(repo->url), hex);
+        cgit_compose_snapshot_prefix(&filename, cgit_snapshot_prefix(repo), hex);
         prefixlen = filename.len;
         for (f = cgit_snapshot_formats; f->suffix; f++) {
                 if (!(repo->snapshots & f->bit))
diff --git a/ui-shared.h b/ui-shared.h
index b3eb8c5..92a1755 100644
--- a/ui-shared.h
+++ b/ui-shared.h
@@ -78,6 +78,7 @@ extern void cgit_compose_snapshot_prefix(struct strbuf *filename,
                                          const char *base, const char *ref);
 extern void cgit_print_snapshot_links(const struct cgit_repo *repo,
                                       const char *head, const char *hex);
+extern const char *cgit_snapshot_prefix(const struct cgit_repo *repo);
 extern void cgit_add_hidden_formfields(int incl_head, int incl_search,
                                        const char *page);
 
diff --git a/ui-snapshot.c b/ui-snapshot.c
index 237a75f..b9e2a36 100644
--- a/ui-snapshot.c
+++ b/ui-snapshot.c
@@ -154,7 +154,7 @@ static const char *get_ref_from_filename(const struct cgit_repo *repo,
         if (get_oid(snapshot.buf, &oid) == 0)
                 goto out;
 
-        reponame = cgit_repobasename(repo->url);
+        reponame = cgit_snapshot_prefix(repo);
         if (starts_with(snapshot.buf, reponame)) {
                 const char *new_start = snapshot.buf;
                 new_start += strlen(reponame);
@@ -214,7 +214,7 @@ void cgit_print_snapshot(const char *head, const char *hex,
                 hex = head;
 
         if (!prefix)
-                prefix = xstrdup(cgit_repobasename(ctx.repo->url));
+                prefix = xstrdup(cgit_snapshot_prefix(ctx.repo));
 
         make_snapshot(f, hex, prefix, filename);
         free(prefix);