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## CCTZ needs zoneinfo. On windows we set it to R's own zoneinfo. On unix like
## it's in "/usr/share/zoneinfo" where CCTZ looks by default. On some systems
## (solaris, osx) it might be in a different location. So, help ourselves by
## setting the TZDIR env var, but only if it's not already set.
##
## As of R4.0.3 Sys.timezone() intrusively sets TZDIR to non path values.
## https://github.com/wch/r-source/commit/92712b530e5f0f3c19b1e83ed86554bbfb6d9095#diff-883a8df98e17cbfd43513e7378ae4899bf504d8dbd8e47d021d8493602ab4b8fR52-R66
tzdir_set <- function() {
# On MacOS, this chooses between system and built-in zoneinfo based on
# which is newer
Sys.timezone()
tzdir <- tzdir_get()
if (tzdir == "internal") {
Sys.setenv(TZDIR = tzdir_internal())
} else if (tzdir %in% c("macOS", "")) {
dir <- tzdir_find()
if (is.null(dir)) {
warning("Failed to locate timezone database", call. = FALSE)
} else {
Sys.setenv(TZDIR = dir)
}
}
}
tzdir_get <- function() {
Sys.getenv("TZDIR")
}
## adapted from Syz.timezone and OlsonNames function
tzdir_find <- function() {
tzdirs <- c()
conda_prefix <- Sys.getenv("CONDA_PREFIX")
if (conda_prefix != "") {
tzdirs <- c(tzdirs, file.path(conda_prefix, "share", "zoneinfo"))
}
if (.Platform$OS.type != "windows") {
tzdirs <- c(
tzdirs,
"/usr/share/zoneinfo",
"/usr/share/lib/zoneinfo",
"/usr/lib/zoneinfo",
"/usr/local/etc/zoneinfo",
"/etc/zoneinfo",
"/usr/etc/zoneinfo",
"/usr/share/zoneinfo.default",
"/var/db/timezone/zoneinfo"
)
}
tzdirs <- c(tzdirs, tzdir_internal())
tzdirs <- tzdirs[file.exists(tzdirs)]
if (length(tzdirs)) {
tzdirs[[1]]
} else {
NULL
}
}
tzdir_internal <- function() {
file.path(R.home("share"), "zoneinfo")
}
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