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https://github.com/flatpak/flatpak.git
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dc56bda820
Which allows one to create an image source from a container location. It also adds a new FlatpakDockerReference to access different parts of a docker reference and changes to FlatpakOciIndex to get a manifest for a specific architecture. This will become useful in the next commit when we're going to add support for installing OCI images.
141 lines
4.2 KiB
C
141 lines
4.2 KiB
C
/* vi:set et sw=2 sts=2 cin cino=t0,f0,(0,{s,>2s,n-s,^-s,e-s:
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* Copyright © 2024 Red Hat, Inc
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Authors:
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* Owen Taylor <otaylor@redhat.com>
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*/
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#include "flatpak-docker-reference-private.h"
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#include "flatpak-utils-private.h"
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struct _FlatpakDockerReference
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{
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char *uri;
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char *repository;
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char *tag;
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char *digest;
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};
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/*
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* Parsing here is loosely based off:
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*
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* https://github.com/containers/image/tree/main/docker/reference
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*
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* The major simplification is that we require a domain component, and
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* don't have any default domain. This removes ambiguity between domains and paths
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* and makes parsing much simpler. We also don't normalize single component
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* paths (e.g. ubuntu => library/ubuntu.)
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*/
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#define TAG "[0-9A-Za-z_][0-9A-Za-z_-]{0,127}"
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#define DIGEST "[A-Za-z][A-Za-z0-9]*(?:[-_+.][A-Za-z][A-Za-z0-9]*)*[:][[:xdigit:]]{32,}"
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#define REMAINDER_TAG_AND_DIGEST_RE "^(.*?)(:" TAG ")?" "(@" DIGEST ")?$"
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static GRegex *
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get_remainder_tag_and_digest_regex (void)
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{
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static gsize regex = 0;
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if (g_once_init_enter (®ex))
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{
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g_autoptr(GRegex) compiled = g_regex_new (REMAINDER_TAG_AND_DIGEST_RE,
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G_REGEX_DEFAULT,
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G_REGEX_MATCH_DEFAULT,
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NULL);
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g_once_init_leave (®ex, (gsize)g_steal_pointer (&compiled));
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}
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return (GRegex *)regex;
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}
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FlatpakDockerReference *
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flatpak_docker_reference_parse (const char *reference_str,
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GError **error)
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{
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g_autoptr(FlatpakDockerReference) reference = g_new0 (FlatpakDockerReference, 1);
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GRegex *regex = get_remainder_tag_and_digest_regex ();
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g_autoptr(GMatchInfo) match_info = NULL;
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g_autofree char *tag_match = NULL;
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g_autofree char *digest_match = NULL;
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g_autofree char *remainder = NULL;
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g_autofree char *domain = NULL;
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gboolean matched;
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const char *slash;
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matched = g_regex_match (regex, reference_str, G_REGEX_MATCH_DEFAULT, &match_info);
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g_assert (matched);
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tag_match = g_match_info_fetch (match_info, 2);
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if (tag_match[0] == '\0')
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reference->tag = NULL;
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else
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reference->tag = g_strdup (tag_match + 1);
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digest_match = g_match_info_fetch (match_info, 3);
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if (digest_match[0] == '\0')
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reference->digest = NULL;
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else
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reference->digest = g_strdup (digest_match + 1);
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remainder = g_match_info_fetch (match_info, 1);
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slash = strchr (remainder, '/');
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if (slash == NULL || slash == reference_str || *slash == '\0')
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{
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flatpak_fail(error, "Can't parse %s into <domain>/<repository>", remainder);
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return NULL;
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}
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domain = g_strndup (remainder, slash - remainder);
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reference->uri = g_strconcat ("https://", domain, NULL);
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reference->repository = g_strdup (slash + 1);
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return g_steal_pointer (&reference);
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}
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const char *
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flatpak_docker_reference_get_uri (FlatpakDockerReference *reference)
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{
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return reference->uri;
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}
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const char *
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flatpak_docker_reference_get_repository (FlatpakDockerReference *reference)
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{
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return reference->repository;
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}
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const char *
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flatpak_docker_reference_get_tag (FlatpakDockerReference *reference)
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{
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return reference->tag;
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}
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const char *
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flatpak_docker_reference_get_digest (FlatpakDockerReference *reference)
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{
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return reference->digest;
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}
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void
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flatpak_docker_reference_free (FlatpakDockerReference *reference)
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{
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g_clear_pointer (&reference->uri, g_free);
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g_clear_pointer (&reference->repository, g_free);
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g_clear_pointer (&reference->tag, g_free);
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g_clear_pointer (&reference->digest, g_free);
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g_free (reference);
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}
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