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[英]Calling script works from terminal but not from python subprocess.call
[英]calling rsync from python subprocess.call
我正在嘗試從python腳本中的子進程執行ssh上的rsync,以將圖像從一個服務器復制到另一個服務器。 我有一個函數定義為:
def rsyncBookContent(bookIds, serverEnv):
bookPaths = ""
if len(bookIds) > 1:
bookPaths = "{" + ",".join(("book_"+str(x)) for x in bookIds) + "}"
else:
bookPaths = "book_" + str(bookIds[0])
for host in serverEnv['content.hosts']:
args = ["rsync", "-avz", "--include='*/'", "--include='*.jpg'", "--exclude='*'", "-e", "ssh", options.bookDestDir + "/" + bookPaths, "jill@" + host + ":/home/jill/web/public/static/"]
print "executing " + ' '.join(args)
subprocess.call(args)
我最終要做的是讓Python執行這個(它來自bash shell):
rsync -avz --include='*/' --include='*.jpg' --exclude='*' -e ssh /shared/books/{book_482,book_347} jill@10.12.27.20:/home/jill/web/public/static/
確實,我的印刷聲明輸出:
executing rsync -avz --include='*/' --include='*.jpg' --exclude='*' -e ssh /shared/books/{book_482,book_347} jill@10.12.27.20:/home/jill/web/public/static/
但是當從這個python腳本中執行時,有兩個問題:
看起來好像subprocess.call函數需要轉義一些字符或什么,不是嗎?
找出我的問題。 我的問題是由於我誤解了subprocess.call函數的執行方式以及bash在花括號內擴展列表的結果。
當我在bash shell中發出帶有大括號子目錄的rsync命令時,bash實際上將它擴展為多個參數,這些參數被傳遞給rsync(/ shared / books / book_1 shared / books / book_2等)。 將帶有大括號“/ shared / books / {book_1,book_2}”的相同字符串傳遞給subprocess.call函數時,擴展沒有發生,因為它沒有經過bash,所以我對rsync的論證確實是“/ shared / books / {book_1,book_2}”。
類似地,文件模式('*','* .jpg'等)周圍的單引號在bash命令行上起作用(只有單引號內的值傳遞給rsync),但在subprocess.call中,單引號作為文件模式(“'* .jpg'”)傳遞給rsync。
新的(工作)代碼如下所示:
def rsyncBookContent(bookIds, serverEnv):
bookPaths = []
for b in bookIds:
bookPaths.append(options.bookDestDir + "/book_" + str(b))
args = []
for host in serverEnv['content.hosts']:
# copy all *.jpg files via ssh
args = ["rsync", "-avz", "--include", "*/", "--include", "*.jpg", "--exclude", "*", "-e", "ssh"]
args.extend(bookPaths)
args.append("jill@" + host + ":/home/jill/web/public/static/"])
print "executing " + ' '.join(args)
subprocess.call(args)
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