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cloud-setup/azure: add ability to redirect metadata API requests

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A different host can be specified with (undocumented, private)
NM_CLOUD_SETUP_AZURE_HOST environment variable.
This commit is contained in:
Lubomir Rintel 2023-04-17 07:08:12 +02:00 • committed by Thomas Haller
parent 1f310abfd8
commit 515e69df3a
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1 changed files with 23 additions and 1 deletions
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24
src/nm-cloud-setup/nmcs-provider-azure.c
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@ -17,8 +17,30 @@
#define NM_AZURE_METADATA_URL_BASE /* $NM_AZURE_BASE/$NM_AZURE_API_VERSION */ \
"/metadata/instance/network/interface/"
static const char *
_azure_base(void)
{
static const char *base_cached = NULL;
const char *base;
again:
base = g_atomic_pointer_get(&base_cached);
if (G_UNLIKELY(!base)) {
/* The base URI can be set via environment variable.
* This is mainly for testing, it's not usually supposed to be configured.
* Consider this private API! */
base = g_getenv(NMCS_ENV_VARIABLE("NM_CLOUD_SETUP_AZURE_HOST"));
base = nmcs_utils_uri_complete_interned(base) ?: ("" NM_AZURE_BASE);
if (!g_atomic_pointer_compare_and_exchange(&base_cached, NULL, base))
goto again;
}
return base;
}
#define _azure_uri_concat(...) \
nmcs_utils_uri_build_concat(NM_AZURE_BASE, __VA_ARGS__, NM_AZURE_API_VERSION)
nmcs_utils_uri_build_concat(_azure_base(), __VA_ARGS__, NM_AZURE_API_VERSION)
#define _azure_uri_interfaces(...) _azure_uri_concat(NM_AZURE_METADATA_URL_BASE, ##__VA_ARGS__)
/*****************************************************************************/