106 lines
4.1 KiB
Diff
106 lines
4.1 KiB
Diff
From d175d6d2260cd4b2116669953058fa9bef7ae478 Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Sun, 16 Oct 2022 22:39:31 +0200
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Subject: [PATCH] generator: teach generator_add_symlink() to instantiate
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specified unit
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if we want generators to instantiate a template service, we need to
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teach generator_add_symlink() the concept.
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Just some preparation for a later commit.
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While we are at it, modernize the function around
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path_extract_filename() + path_extract_directory()
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(cherry picked from commit 0ba07f907721941f611eaca9521937c467bdfff2)
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Related: #2190226
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---
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src/shared/generator.c | 51 ++++++++++++++++++++++++++++++++++--------
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src/shared/generator.h | 6 ++++-
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2 files changed, 47 insertions(+), 10 deletions(-)
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diff --git a/src/shared/generator.c b/src/shared/generator.c
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index 4c684fc3e7..6001b2778c 100644
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--- a/src/shared/generator.c
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+++ b/src/shared/generator.c
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@@ -59,19 +59,52 @@ int generator_open_unit_file(
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return 0;
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}
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-int generator_add_symlink(const char *dir, const char *dst, const char *dep_type, const char *src) {
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- /* Adds a symlink from <dst>.<dep_type>/ to <src> (if src is absolute)
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- * or ../<src> (otherwise). */
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+int generator_add_symlink_full(
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+ const char *dir,
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+ const char *dst,
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+ const char *dep_type,
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+ const char *src,
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+ const char *instance) {
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+
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+ _cleanup_free_ char *dn = NULL, *fn = NULL, *instantiated = NULL, *to = NULL, *from = NULL;
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+ int r;
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+
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+ assert(dir);
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+ assert(dst);
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+ assert(dep_type);
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+ assert(src);
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+
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+ /* Adds a symlink from <dst>.<dep_type>/ to <src> (if src is absolute) or ../<src> (otherwise). If
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+ * <instance> is specified, then <src> must be a template unit name, and we'll instantiate it. */
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- const char *from, *to;
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+ r = path_extract_directory(src, &dn);
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+ if (r < 0 && r != -EDESTADDRREQ) /* EDESTADDRREQ → just a file name was passed */
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+ return log_error_errno(r, "Failed to extract directory name from '%s': %m", src);
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- from = path_is_absolute(src) ? src : strjoina("../", src);
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- to = strjoina(dir, "/", dst, ".", dep_type, "/", basename(src));
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+ r = path_extract_filename(src, &fn);
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+ if (r < 0)
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+ return log_error_errno(r, "Failed to extract file name from '%s': %m", src);
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+ if (r == O_DIRECTORY)
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+ return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Expected path to regular file name, but got '%s', refusing.", src);
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+
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+ if (instance) {
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+ r = unit_name_replace_instance(fn, instance, &instantiated);
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+ if (r < 0)
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+ return log_error_errno(r, "Failed to instantiate '%s' for '%s': %m", fn, instance);
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+ }
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+
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+ from = path_join(dn ?: "..", fn);
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+ if (!from)
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+ return log_oom();
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+
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+ to = strjoin(dir, "/", dst, ".", dep_type, "/", instantiated ?: fn);
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+ if (!to)
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+ return log_oom();
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(void) mkdir_parents_label(to, 0755);
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- if (symlink(from, to) < 0)
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- if (errno != EEXIST)
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- return log_error_errno(errno, "Failed to create symlink \"%s\": %m", to);
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+
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+ if (symlink(from, to) < 0 && errno != EEXIST)
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+ return log_error_errno(errno, "Failed to create symlink \"%s\": %m", to);
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return 0;
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}
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diff --git a/src/shared/generator.h b/src/shared/generator.h
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index 1b4f36ac53..a4049dbd8f 100644
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--- a/src/shared/generator.h
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+++ b/src/shared/generator.h
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@@ -12,7 +12,11 @@ int generator_open_unit_file(
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const char *name,
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FILE **file);
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-int generator_add_symlink(const char *dir, const char *dst, const char *dep_type, const char *src);
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+int generator_add_symlink_full(const char *dir, const char *dst, const char *dep_type, const char *src, const char *instance);
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+
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+static inline int generator_add_symlink(const char *dir, const char *dst, const char *dep_type, const char *src) {
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+ return generator_add_symlink_full(dir, dst, dep_type, src, NULL);
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+}
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int generator_write_fsck_deps(
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FILE *f,
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