blob: 7d8bd93a42d83a2da26eba0ae3d332260c89a63d (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
#! @shell@ -e
url=$1
expHash=$2
# needed to make it work on NixOS
export PATH=$PATH:@coreutils@
hashType=$NIX_HASH_ALGO
if test -z "$hashType"; then
hashType=sha256
fi
hashFormat=
if test "$hashType" != "md5"; then
hashFormat=--base32
fi
if test -z "$url"; then
echo "syntax: nix-prefetch-url URL [EXPECTED-HASH]" >&2
exit 1
fi
# Handle escaped characters in the URI. `+', `=' and `?' are the only
# characters that are valid in Nix store path names but have a special
# meaning in URIs.
name=$(basename "$url" | sed -e 's/%2b/+/g' -e 's/%3d/=/g' -e 's/%3f/\?/g')
if test -z "$name"; then echo "invalid url"; exit 1; fi
# If the hash was given, a file with that hash may already be in the
# store.
if test -n "$expHash"; then
finalPath=$(@bindir@/nix-store --print-fixed-path "$hashType" "$expHash" "$name")
if ! @bindir@/nix-store --check-validity "$finalPath" 2> /dev/null; then
finalPath=
fi
hash=$expHash
fi
mkTempDir() {
if test -n "$tmpPath"; then return; fi
local i=0
while true; do
if test -z "$TMPDIR"; then TMPDIR=/tmp; fi
tmpPath=$TMPDIR/nix-prefetch-url-$$-$i
if mkdir "$tmpPath"; then break; fi
# !!! to bad we can't check for ENOENT in mkdir, so this check
# is slightly racy (it bombs out if somebody just removed
# $tmpPath...).
if ! test -e "$tmpPath"; then exit 1; fi
i=$((i + 1))
done
trap removeTempDir EXIT SIGINT SIGQUIT
}
removeTempDir() {
if test -n "$tmpPath"; then
rm -rf "$tmpPath" || true
fi
}
doDownload() {
@curl@ $cacheFlags --fail --location --max-redirs 20 --disable-epsv \
--cookie-jar $tmpPath/cookies "$url" -o $tmpFile
}
# Hack to support the mirror:// scheme from Nixpkgs.
if test "${url:0:9}" = "mirror://"; then
if test -z "$NIXPKGS_ALL"; then
echo "Resolving mirror:// URLs requires Nixpkgs. Please point \$NIXPKGS_ALL at a Nixpkgs tree." >&2
exit 1
fi
mkTempDir
nix-build "$NIXPKGS_ALL" -A resolveMirrorURLs --argstr url "$url" -o $tmpPath/urls > /dev/null
expanded=($(cat $tmpPath/urls))
if test "${#expanded[*]}" = 0; then
echo "$0: cannot resolve $url." >&2
exit 1
fi
echo "$url expands to ${expanded[*]} (using ${expanded[0]})" >&2
url="${expanded[0]}"
fi
# If we don't know the hash or a file with that hash doesn't exist,
# download the file and add it to the store.
if test -z "$finalPath"; then
mkTempDir
tmpFile=$tmpPath/$name
# Optionally do timestamp-based caching of the download.
# Actually, the only thing that we cache in $NIX_DOWNLOAD_CACHE is
# the hash and the timestamp of the file at $url. The caching of
# the file *contents* is done in Nix store, where it can be
# garbage-collected independently.
if test -n "$NIX_DOWNLOAD_CACHE"; then
echo -n "$url" > $tmpPath/url
urlHash=$(@bindir@/nix-hash --type sha256 --base32 --flat $tmpPath/url)
echo "$url" > "$NIX_DOWNLOAD_CACHE/$urlHash.url"
cachedHashFN="$NIX_DOWNLOAD_CACHE/$urlHash.$hashType"
cachedTimestampFN="$NIX_DOWNLOAD_CACHE/$urlHash.stamp"
cacheFlags="--remote-time"
if test -e "$cachedTimestampFN" -a -e "$cachedHashFN"; then
# Only download the file if it is newer than the cached version.
cacheFlags="$cacheFlags --time-cond $cachedTimestampFN"
fi
fi
# Perform the download.
doDownload
if test -n "$NIX_DOWNLOAD_CACHE" -a ! -e $tmpFile; then
# Curl didn't create $tmpFile, so apparently there's no newer
# file on the server.
hash=$(cat $cachedHashFN)
finalPath=$(@bindir@/nix-store --print-fixed-path "$hashType" "$hash" "$name")
if ! @bindir@/nix-store --check-validity "$finalPath" 2> /dev/null; then
echo "cached contents of \`$url' disappeared, redownloading..." >&2
finalPath=
cacheFlags="--remote-time"
doDownload
fi
fi
if test -z "$finalPath"; then
# Compute the hash.
hash=$(@bindir@/nix-hash --type "$hashType" $hashFormat --flat $tmpFile)
if ! test -n "$QUIET"; then echo "hash is $hash" >&2; fi
if test -n "$NIX_DOWNLOAD_CACHE"; then
echo $hash > $cachedHashFN
touch -r $tmpFile $cachedTimestampFN
fi
# Add the downloaded file to the Nix store.
finalPath=$(@bindir@/nix-store --add-fixed "$hashType" $tmpFile)
if test -n "$expHash" -a "$expHash" != "$hash"; then
echo "hash mismatch for URL \`$url'" >&2
exit 1
fi
fi
fi
if ! test -n "$QUIET"; then echo "path is $finalPath" >&2; fi
echo $hash
if test -n "$PRINT_PATH"; then
echo $finalPath
fi
|
