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sysupdate: Add --transfer-source=

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In mkosi, I want to add a sysupdate verb to wrap systemd-sysupdate.
The definitions will be picked up from mkosi.sysupdate/ and passed
to systemd-sysupdate. I want users to be able to write transfer
definitions that are independent of the output directory used by
mkosi. To make this possible, it should be possible to specify the
directory that transfer sources should be looked up in on the sysupdate
command line. Let's allow this via a new --transfer-source= option.

Additionally, transfer sources that want to take advantage of this
feature should specify PathRelativeTo=directory to indicate the configured
Path= is interpreted relative to the tranfer source directory specified
on the CLI.

This allows for the following transfer definition to be put in
mkosi.sysupdate:

"""
[Transfer]
ProtectVersion=%A

[Source]
Type=regular-file
Path=/
PathRelativeTo=directory
MatchPattern=ParticleOS_@v.usr-%a.@u.raw

[Target]
Type=partition
Path=auto
MatchPattern=ParticleOS_@v
MatchPartitionType=usr
PartitionFlags=0
ReadOnly=1
"""
This commit is contained in:
Daan De Meyer
2024-09-09 16:41:52 +02:00
parent 4ec630bfba
commit c1852f9d5f
7 changed files with 58 additions and 7 deletions
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src/sysupdate/sysupdate-transfer.c
+10 -2
View File
@@ -557,6 +557,14 @@ int transfer_read_definition(Transfer *t, const char *path) {
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"Source specification lacks Path=.");
if (t->source.path_relative_to == PATH_RELATIVE_TO_EXPLICIT && !arg_transfer_source)
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"PathRelativeTo=explicit requires --transfer-source= to be specified.");
if (t->target.path_relative_to == PATH_RELATIVE_TO_EXPLICIT)
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"PathRelativeTo=explicit can only be used in source specifications.");
if (t->source.path) {
if (RESOURCE_IS_FILESYSTEM(t->source.type) || t->source.type == RESOURCE_PARTITION)
if (!path_is_absolute(t->source.path) || !path_is_normalized(t->source.path))
@@ -618,11 +626,11 @@ int transfer_resolve_paths(
assert(t);
r = resource_resolve_path(&t->source, root, node);
r = resource_resolve_path(&t->source, root, arg_transfer_source, node);
if (r < 0)
return r;
r = resource_resolve_path(&t->target, root, node);
r = resource_resolve_path(&t->target, root, /*relative_to_directory=*/ NULL, node);
if (r < 0)
return r;