From f3e4d04298bb73b836dd7ca90f7c7b09de1e776b Mon Sep 17 00:00:00 2001 From: Antonio Alvarez Feijoo Date: Mon, 10 Apr 2023 15:18:53 +0200 Subject: [PATCH] network-generator: rewrite unit if it already exists and its content changed When the `systemd-network-generator` is included in the initrd and runs from there first, the next times it runs after switching to real root it thinks there is a duplicate entry on the kernel command line. This patch rewrites the unit file if the content has changed, instead of displaying an error message. --- src/network/generator/main.c | 55 ++++++++++++++++++++++++++++-------- 1 file changed, 43 insertions(+), 12 deletions(-) diff --git a/src/network/generator/main.c b/src/network/generator/main.c index a0af0b831b4..492980249b7 100644 --- a/src/network/generator/main.c +++ b/src/network/generator/main.c @@ -4,6 +4,7 @@ #include "build.h" #include "fd-util.h" +#include "fs-util.h" #include "generator.h" #include "macro.h" #include "main-func.h" @@ -17,67 +18,97 @@ static const char *arg_root = NULL; static int network_save(Network *network, const char *dest_dir) { - _cleanup_free_ char *filename = NULL; + _cleanup_free_ char *filename = NULL, *p = NULL; + _cleanup_(unlink_and_freep) char *temp_path = NULL; _cleanup_fclose_ FILE *f = NULL; int r; assert(network); + r = generator_open_unit_file_full(dest_dir, NULL, NULL, &f, &temp_path); + if (r < 0) + return r; + + network_dump(network, f); + r = asprintf(&filename, "%s-%s.network", isempty(network->ifname) ? "91" : "90", isempty(network->ifname) ? "default" : network->ifname); if (r < 0) return log_oom(); - r = generator_open_unit_file(dest_dir, "kernel command line", filename, &f); + p = path_join(dest_dir, filename); + if (!p) + return log_oom(); + + r = conservative_rename(temp_path, p); if (r < 0) return r; - network_dump(network, f); - + temp_path = mfree(temp_path); return 0; } static int netdev_save(NetDev *netdev, const char *dest_dir) { - _cleanup_free_ char *filename = NULL; + _cleanup_free_ char *filename = NULL, *p = NULL; + _cleanup_(unlink_and_freep) char *temp_path = NULL; _cleanup_fclose_ FILE *f = NULL; int r; assert(netdev); + r = generator_open_unit_file_full(dest_dir, NULL, NULL, &f, &temp_path); + if (r < 0) + return r; + + netdev_dump(netdev, f); + r = asprintf(&filename, "90-%s.netdev", netdev->ifname); if (r < 0) return log_oom(); - r = generator_open_unit_file(dest_dir, "kernel command line", filename, &f); + p = path_join(dest_dir, filename); + if (!p) + return log_oom(); + + r = conservative_rename(temp_path, p); if (r < 0) return r; - netdev_dump(netdev, f); - + temp_path = mfree(temp_path); return 0; } static int link_save(Link *link, const char *dest_dir) { - _cleanup_free_ char *filename = NULL; + _cleanup_free_ char *filename = NULL, *p = NULL; + _cleanup_(unlink_and_freep) char *temp_path = NULL; _cleanup_fclose_ FILE *f = NULL; int r; assert(link); + r = generator_open_unit_file_full(dest_dir, NULL, NULL, &f, &temp_path); + if (r < 0) + return r; + + link_dump(link, f); + filename = strjoin(!isempty(link->ifname) ? "90" : !hw_addr_is_null(&link->mac) ? "91" : "92", "-", link->filename, ".link"); if (!filename) return log_oom(); - r = generator_open_unit_file(dest_dir, "kernel command line", filename, &f); + p = path_join(dest_dir, filename); + if (!p) + return log_oom(); + + r = conservative_rename(temp_path, p); if (r < 0) return r; - link_dump(link, f); - + temp_path = mfree(temp_path); return 0; } -- 2.47.3